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Feeling a Little Like Fall on the Three Points – Mt. Waterman Loop

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Rabbitbrush along the PCT east of Winston Peak.
Rabbitbrush along the PCT east of Winston Peak.

Even with the warm weather, it was beginning to feel a little like Fall in the San Gabriel Mountains. Yellow goldenrod and red California fuchsia bloomed along the trail,  and the canyon live oaks were covered in green acorns.

Mt. Pacifico (7124') from low on the Three Points - Mt. Waterman Trail.
Mt. Pacifico (7124′) from low on the Three Points – Mt. Waterman Trail.

I was back on the Three Points – Mt. Waterman Loop and having a better time of it than in June. The June run had been near the Summer Solstice, with in-the-sun temperatures reaching 100°F. Today’s run was a few days away from the Fall Equinox. Not only was the temperature about 10 degrees cooler, the sun was lower in the sky and less intense.

But much was the same as in June. There was still plenty of whitethorn on the first couple of miles of the Three Points – Mt. Waterman Trail — and a few prickly passages for anyone wearing shorts and short sleeves. Some trailwork had been done higher on the mountain, but a few fallen trees were still on the trail. Most of these were easy to step over, around, under, or through.

Late season Bigelow's sneezeweed at Waterman Meadow.
Late season Bigelow’s sneezeweed at Waterman Meadow.

There was very little monsoon rainfall this Summer, but consecutive wet rainy season and a tropical storm had already recharged the seeps and small creeks. The creeks were only slightly lower than in June, and the places that had been wet and muddy in June were still wet and muddy. At Waterman Meadow, a few late-season blooms of sneezeweed beamed yellow in the midst of the greens of the grass and ferns.

The high point of the Three Points – Mt. Waterman Trail is near the junction with the trail to the summit of Waterman and the trail that comes up from Highway 2. It’s at an elevation of about 7686′. Including detours to get around downed trees, the junction is a bit more  than 6 miles from Three Points. The junction marks the start of a nearly 2000′ descent over 4.7 miles to the PCT in Cooper Canyon.

A dazzling display of California fuchsia along the Burkhart Trail.
California fuchsia along the Burkhart Trail.

This morning, I encountered no one on the Three Points – Mt. Waterman Trail and only one pair of hikers on the normally busy Mt. Waterman Trail. Buckhorn Campground was nearly empty. I topped off my water at a convenient faucet at the campground and then started down the Burkhart Trail.

The creek in the canyon below the Burkhart Trail happily bubbled and gurgled, its water easily outpacing me as I descended to the PCT. Some work had been done on the trail to help those hiking to Cooper Canyon Falls cross the muddy seeps. Near one seep, a patch of dazzling red California fuchsia contrasted sharply with the coal black of a tree burned in the Bobcat Fire.

A black bear track on the Three Points - Mt. Waterman Trail.
Black bear track.

I wouldn’t say the trail has been abandoned, but it’s been quite a while since any trailwork has been done on the PCT between the Burkhart Trail and Cloudburst Summit. A mass of trees is still blocking the trail near the creek crossing at the bottom of Cooper Canyon. As expected following a fire, trees continue to fall on the trail. Parts of the trail along the creek or near seeps are overgrown with “Hey Bear!” willows.

The PCT in Cooper Canyon has been isolated by the 19-year closure to protect the critically endangered mountain yellow-legged frog. In December 2005, Angeles National Forest “temporarily” closed the Williamson Rock climbing area and the PCT between Eagle’s Roost and the Burkhart Trail. This Summer, the Forest Service extended the closure to at least December 31, 2026.

It’s difficult to accept that the Forest Service, conservation groups, and involved agencies have not agreed on a solution. Can’t the short stretch of the PCT that impacts frog habitat be rerouted? Only a few climbs at Williamson Rock directly impact the frog habitat. Does the entire climbing area need to be closed? Can’t bridges, walkways, and other structures be used to protect and even enhance frog habitat? There has to be solution. In 2005, I could not have imagined that 21 years later Williamson Rock would still be closed, and I might not have the opportunity to climb there again.

Goldenrod and California fuchsia cover a slope along the PCT in Cooper Canyon.
Goldenrod and California fuchsia along the PCT in Cooper Canyon.

On this run, it wasn’t necessary to stop at Cooper Camp to cool off. Although the temperature was in the 90s on the south-facing slopes traversed by the PCT, there was a bit of a cooling breeze. This and the lower sun angle made it far more pleasant than earlier in the year.

Continuing up the trail above Cooper Camp, I could see smoke from a flare-up on the north flank of the Bridge Fire. Closures related to the Bridge Fire will further isolate the Cooper Canyon segment of the PCT. Multi-year closures are common on the Angeles, and often the closures include popular trails that were not burned.

From Cloudburst Summit, it’s a little over five miles of (mostly) downhill to Three Points. Most of the running is on an old road bed. Although it can be tedious — especially when it’s hot — the segment is relatively fast-paced. Depending on the year, there are usually a couple of places to soak a hat and pour water over your head. But, as I learned one hot day, a rattlesnake may take exception to your intrusion!

Some related posts:
– Bridge Fire Perimeter and Some Area Trails
– Facing a Future of Runaway Wildfires in Southern California
– Hot Weather on the Three Points Loop
– Williamson Rock

adventures, climate change, landscape, nature, nature|trees, nature|wildfire, photography, photography|landscape, running, running|adventures, san gabriel mountains, trails, trails|san gabriels, trees, trees, wildfire

Facing a Future of Runaway Wildfires in Southern California

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A group of Jeffrey pines on Mt. Waterman killed by the Bobcat Fire with smoke from the Bridge Fire in the distance.

It was a sobering sight. I had stopped at a point on Mt. Waterman burned by the Station Fire in 2009 and the Bobcat Fire in 2020.

To the east, smoke from the Bridge Fire filled the canyons and clung to the ridges between Mt. Baldy and the East Fork San Gabriel River. A group of skeletal Jeffrey pines, once full and green, stood starkly in the foreground.

Another devastating fire had stormed through the San Gabriel Mountains, destroying homes and ravaging the forest and all that lives within. Not far away, the Line and Airport Fires were also burning, the extent of the three fires totaling over 117,500 acres.

Conventional methods of land and fire management usually do not prevent the rapid spread of a fire when forest or weather conditions are extreme — and extreme conditions are now the norm.

Incremental changes to long-established policies will not be enough to prevent runaway wildfires. Novel approaches must be considered, researched and evaluated. New tools and technology, including AI, need to be more widely applied. The hesitancy to spend money proactively must be overcome.

Today, it is difficult to do a hike or run of more than a few miles in the foothills or mountains of Southern California without passing through an area that has been burned in the past 25 years. In 50, 100, or 200 years what will the outdoor experience be? Will conifers only exist in widely scattered stands? Will the ecology be forever compromised?

Every effort must be made to mitigate the impacts of runaway wildfires and preserve the nature and ecology of our open space areas and wildlands.

Some related posts:
– Bridge Fire Perimeter and Some Area Trails
– After the Bobcat and Station Fires: Three Points Loop Around Mt. Waterman
– After the Station Fire: Pine Seedling Along the Mt. Waterman Trail
– Waterman Mountain: Fallen Trees, Forest and Ferns
– After the Station Fire: Three Points – Mt. Waterman Loop

adventures, landscape, nature, nature|wildfire, photography, photography|landscape, running, running|adventures, san gabriel mountains, trails, trails|san gabriels, wildfire

Rim Trail – Kenyon Devore Loop from the Top of Mt. Wilson

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San Gabriels High County from the Rim Trail
San Gabriels High County from the Rim Trail

It was great to be back on the Rim Trail! One of the most underappreciated trails in Angeles National Forest, the 3.6 mile trail was closed in October 2020 because of the Bobcat Fire. It finally reopened in June of this year (2024).

Mt. Harvard from near the start of the Rim Trail on top of Mt. Wilson.
Mt. Harvard from near the start of the Rim Trail.

This morning’s run had started at the top of the Kenyon Devore Trail from the same turnout on Mt. Wilson Circle Road as two weeks before. This time, instead of running down Mt. Wilson Road, I had descended a short distance on the Kenyon Devore Trail and turned right (east) on a half-mile long trail that connects to the main Mt. Wilson parking lot. From there I followed the “Authorized Vehicles Only” road toward the observatory about a quarter-mile to the signed start of the Rim Trail. Interpretive signs along the road note some of the area’s plants and trees.

An exhilarating section of the Rim Trail where it is narrow and bounded by a rock wall.
An exhilarating stretch of the Rim Trail.

When done as a counterclockwise loop from Mt. Wilson, the Rim Trail switchbacks down Mt. Wilson’s steep northeast ridge and then contours along the north side of the West Fork – Santa Anita Canyon divide to Newcomb Pass. Along the way are spectacular views of the Mt. Wilson Observatory complex, the canyons of the West and East Forks San Gabriel River, and the high country of the San Gabriel Mountains. On a clear day, Saddleback, San Jacinto Peak, and San Gorgonio Mountain can be spotted from the trail. To the north, the vast Mojave desert stretches out from the foot of the mountains.

Even though it was closed for nearly four years, the Rim Trail was in remarkably good shape. The trail dips into and out of the Bobcat burn area as it works down the ridge and along the divide. Much of the trail was unscathed, but some sections were severely burned. Sadly, this beautiful bigcone Douglas-fir was destroyed.

Poison oak along the Rim Trail.
Poison oak along the Rim Trail.

Poodle-dog bush marks the stretches of trail burned in the Bobcat Fire. With care, it was generally avoidable, as was the abundant poison oak found on some sections of the trail. (Like poison oak, Poodle-dog bush causes a rash in many people.)

On the way down the Rim Trail, I’d debated which route to take from Newcomb Pass. One option was to run over to Newcomb Saddle and take Rincon-Redbox Road to West Fork. Another was to follow the Gabrielino Trail to Devore Camp and then West Fork. The single-track route through Devore Camp is a more interesting option and is usually my choice.

Trailwork on the Rim Trail near Newcomb Pass.
Trailwork on the Rim Trail near Newcomb Pass.

As I neared Newcomb Pass, I was surprised to see recent trailwork on the isolated stretch of trail. This was a hopeful sign the Gabrielino Trail between Newcomb Pass and Devore Camp might be in decent shape.

At Newcomb Pass, all signs of any trailwork ended. I looked at the first few overgrown yards of the trail connecting to Newcomb Saddle and thought, “I’ll give the Gabrielino Trail a try.” I could see an ill-defined path where the Gabrielino Trail should go and tried to follow it. No go. A lower path also appeared to be a dead end.

I enjoy the challenge of following little-used trails, but today was more interested in running than bushwhacking. Retracing my steps, I returned to the trail connecting to Newcomb Saddle.

Newly installed downslope drain blocking access to the Gabrielino Trail from Rincon-Redbox Road.
Newly installed downslope drain blocking access to the Gabrielino Trail

It wasn’t as bad as I initially thought. The trail was a bit overgrown, but was on an old roadbed and pretty easy to follow. (Later, I discovered I had a bite from a larval tick, which I’m sure I picked up in the Newcomb Pass area.)

Rincon-Redbox Road was wide open and in great shape. When I reached the point where the Gabrielino Trail crosses the road, neither direction on the trail looked particularly promising. Up the trail looked overgrown, and down the trail was blocked by a newly constructed drainage conduit. The Gabrielino Trail is a National Recreation Trail in a National Monument, so should (hopefully) be fully restored.

Jose and Gary cleaning debris underneath a log on the Gabrielino Trail near West Fork.
Jose and Gary cleaning debris underneath a log on the Gabrielino Trail near West Fork.

Running down Rincon-Redbox Road and lost in thought, I was somewhat startled to see a red truck round a bend. I was even more surprised when it turned out to be race director and trailmaster Gary Hilliard. Gary and Jose were out the weekend before the AC100 trying to chase down a couple of logs — one reported to be blocking access to the Newcomb Saddle aid station and another on the Gabrielino Trail “a half-mile from West Fork.”

I’ve had the privilege of running in all of Gary’s ANFTR/Mt. Disappointment races. No one works harder or is more dedicated to the trails of Angeles National Forest and trail running. I didn’t recall a log blocking the road, but it would only take Gary a few minutes to drive up to the aid station and be sure. With cruise control on and lost in thought, I continued running down to West Fork.

At West Fork, I stopped at “the pipe” to get water and cool off. From here, it’s a memorable 5-mile, 2600′ climb to the top of the Kenyon Devore Trail.

Kenyon Devore Trail on Mt. Wilson
Kenyon Devore Trail

I’d been here two weeks before. The Rim Trail – Newcomb Saddle – Kenyon Devore Loop is the mirror image of the Mt. Wilson – Red Box – Kenyon Devore Loop. Two weeks ago it was around 10 degrees warmer and humid. I’d bonked on the climb, and wasn’t looking to repeat that experience today.

This morning – except for a couple of rattlesnakes – the run from West Fork couldn’t have gone better! I even jogged some of the less steep sections of the Kenyon Devore Trail!

Here’s a high-resolution, interactive, 3D-terrain view of the Rim Trail – Newcomb Saddle – Kenyon Devore Loop. The Gabrielino Trail option through Devore Camp is also shown.

Some related posts:
– A Place to Ponder Things Near and Far
– A Morning Thunderstorm, Debris-Covered Trail, Fast-Paced Fire Road, and Tough Climb on the ANFTR 25K Course!
– Running Mt. Wilson’s Rim Trail
– GSU Mt. Wilson CHARA Telescope Array

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Out and Back Trail Run from Islip Saddle to Mt. Baden-Powell – July 2024 Update

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Mt. Baden-Powell from the PCT near Throop Peak.
Mt. Baden-Powell from the PCT near Throop Peak.

Update July 22, 2024. The Poodle-dog bush along the PCT near Islip Saddle has been cleared by Gary Hilliard and the AC 100 Trail Team!

When I reached the summit of Mt. Baden-Powell (9,399′), it was empty, save an opportunistic raven who was evaluating the chances that the Larabar I was eating might fall to the ground.

On top, the heat of the strong Summer sun was offset by a cooling breeze. There was still a few thin ribbons of snow in the chutes on Mt. Baldy. With the excellent visibility, San Jacinto Peak could be seen in the notch between Mt. Baldy and Dawson Peak, and San Gorgonio Mountain was sharply visible to the left of Pine Mountain.

Poodle-dog bush (Eriodictyon parryi) along the PCT just east of Islip Saddle. (thumbnail)
Poodle-dog bush along the PCT just east of Islip Saddle.

Other than a few people at Little Jimmy hike-in camp, I saw no one on the way up from Islip Saddle. A quarter-mile from the trailhead, there was an astonishing display of Poodle-dog bush along the PCT. In 2011, when a large part of Angeles National Forest reopened following the Station Fire, I developed an extensive rash after bushwhacking through Poodle-dog on overgrown trails. After that experience I’ve been more careful around the plant, and haven’t had a bad case since.

Trees were across the trail in a few places. Most were fairly easy to bypass, but a couple were “inconvenient,” such as this big log, about 0.75 mile east of Windy Gap.

Bright red beaked penstemon (Penstemon rostriflorus) along the PCT above Windy Gap. (thumbnail)
Bright red beaked penstemon along the PCT above Windy Gap

As I worked up the switchbacks above the log, to the southwest I could see the observatory and towers on Mt. Wilson. As a result of the damage to Chantry Flat in the Bobcat Fire, Mt. Wilson was on the Angeles Crest 100 Mile course last year, and will be again this year. As the raven flies, Mt. Wilson was only about 16 miles away, but for someone running the AC100, the miles along its challenging course would total well over 50!

For several years I’ve been following the regrowth of conifers in four places along the PCT that were burned in the 2002 Curve Fire. What has been underscored in my informal study is a) trees take a long time to regrow, and b) frequent fires in an area are particularly devastating. Stand #1 (1.5 miles east of Islip Saddle on the PCT) was recovering nicely from the 2002 Curve Fire when it was burned in the 2020 Bobcat Fire. This comparison shows the result. The other three stands continue to recover well, with south-facing Stand #4, west of Throop Peak, growing particularly vigorously.

View WNW along Mt. Baden-Powell's west ridge. (thumbnail)
Limber pine (left) along Mt. Baden-Powell’s west ridge.

Ascending the final 400′ of gain on Baden-Powell’s west ridge, I was surprised to see a couple of small patches of snow remained on the north side of the ridge. The snowpack here was nowhere near as big as in 2023, but it was still pleasing to see that a little of the white stuff survived until July.

No out and back to Baden-Powell is complete without a quick stop at Little Jimmy Spring. Today, the water from spring was so cold it was painful to hold my hand in the water flowing from the pipe!

Some related posts:
– It’s Mid-July And There Is Still Snow in Los Angeles County!
– A Cool and Breezy Out and Back Trail Run from Islip Saddle to Mt. Baden-Powell
– Contact Dermatitis from Eriodictyon parryi – Poodle-dog Bush
– Regrowth of Trees Along the PCT Following the 2002 Curve Fire

ahmanson ranch, nature, nature|wildfire, nature|wildflowers, photography, photography|landscape, photography|wildflowers, running, trails, upper las virgenes canyon open space preserve, weather, weather, wildflowers, wildflowers

Goldfields, Silt Slides, Oak Leaves, Invasive Thistle, Rough Trails, and a Reminder to be Watchful

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Goldfields blooming on Lasky Mesa - March 2024
Goldfields blooming on Lasky Mesa

Following are some notes and photos from runs in Upper Las Virgenes Canyon Open Space Preserve (Ahmanson Ranch) during March 2024.  Spring is here! The hills are green, goldfields and other wildflowers are blooming, and Las Virgenes Creek is flowing.

Goldfields and Other Wildflowers

The first goldfields (Lasthenia gracilis) of 2024 began to bloom on Lasky Mesa at the end of February. Now, bright yellow patches of these “belly” flowers are scattered across the mesa, adding a brush of color to the roads and trails of Ahmanson Ranch. The cheery flowers usually disappear with the first spell of hot and dry weather. Looking ahead, more rain and cool weather are forecast Easter weekend, and extended temperature outlooks are mixed. Hopefully, the goldfields will be around for a few more weeks.

Catalina mariposa lily at Ahmanson Ranch. March 27, 2024. (thumbnail)
Catalina mariposa lily. Click to enlarge.

Some other wildflowers are also blooming. Blue Dicks usually flourish following a wet Winter, but this March are less widespread than usual. Red maids are also less numerous than normal and their flowers somewhat smaller. The elegant white flowers of Catalina mariposa lily are just starting to bloom.

Thanks to T.S. Hilary’s false Spring and copious Winter rain, the hills of Ahmanson Ranch have been green since early October.

Silt Slides
Slides of silty soil in Upper Las Virgenes Canyon Open Space Preserve (thumbnail)
New (left) and old slides of silty soil. Click to enlarge.

With all the rain, small, shallow mudslides have been common along road cuts and other steep slopes of Ahmanson Ranch. The area has fine-grained silty soil. When saturated, it can generate a slurry of silt and debris. The numerous scars on the hillsides suggest this is a primary mechanism of erosion in the area.

Valley Oaks

After losing their leaves in December, the Valley Oaks at Ahmanson are now budding and sprouting. Some trees already have new leaves, while others are still bare-limbed. The period valley oaks are without leaves varies from year to year depending on rainfall, temperature, sunshine, and other factors.

Invasive Milk Thistle
Milk thistle in Las Virgenes Canyon
Milk thistle. Click to enlarge.

Milk thistle thrives during wet years, and it’s been very wet. We’ve had two consecutive wet years, plus a tropical storm thrown in for good measure. The invasive is sprouting in areas where it doesn’t normally grow and growing prolifically in areas where it is established. In a few months, milk thistle may look like it did in May 2005, following the record 2004-2005 rain year.

Rough Trails
Upper Las Virgenes Creek (thumbnail)
Upper Las Virgenes Creek. Click to enlarge.

Profuse rainfall is a two-edged sword. It revitalizes the ecosystem, turns the hills green, recharges the creeks, preserves the trees, produces wildflowers and more. But it can also be problematic — triggering slides, washing out and damaging trails, and promoting plant growth that chokes trails and increases the fire hazard.

At the moment, the roads and trails at Ahmanson are a bit rougher than normal, particularly in East Las Virgenes Canyon. Use and drier weather will gradually smooth out the ruts and rugosities, but we’re going to be picking foxtails from our socks for some time to come.

Upper Las Virgenes Creek is still flowing — including in the canyon’s upper reaches. Sometimes, there will even be a log or two in place to help keep your shoes dry.

And A Reminder to be Watchful
Baby rattlesnake at Ahmanson Ranch (thumbnail)
Baby rattlesnake. Click to enlarge.

I sometimes stretch at the info kiosk at the Victory trailhead before running. Today, as I placed my hands against one of the kiosk posts and started to stretch, I glanced down. Disturbingly close to my feet was a small snake. Adrenaline flowing, I checked the head and tail and then checked them again. I stepped back and began to breathe. It was a gopher snake. But it could have just as easily been a rattlesnake. In fact, later on that run, I encountered a baby rattlesnake. That day and the next (March 20 and 21), I saw a total of four gopher snakes and two Southern Pacific rattlesnakes.

Some related posts:

– Ahmanson Ranch  and Las Virgenes Creek After Six Days of Rain
– East Las Virgenes Canyon After a Seventh Day of Rain
– A Second Spring at Ahmanson Ranch
– Looking For Local Impacts of Tropical Storm Hilary

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Caught in a Thunderstorm on Rocky Peak

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Sun and gathering clouds on Rocky Peak Road before a strong thunderstorm
Sun and gathering clouds on Rocky Peak Road

Rocky Peak Road is an exceptionally popular hiking and biking trail that starts at Santa Susana Pass, on the north side of the 118 Freeway. Regardless of the time of day or weather I ALWAYS see someone on this trail.

The plan for this afternoon’s run was to do an out and back on Rocky Peak Road to the top of the Chumash Trail (3.8 miles) or to Fossil Point (4.8 miles).

Another runner was finishing their workout as I started up the initial steep climb. Glistening in the warm sun, runoff from yesterday’s storm streaked some of the sandstone rocks, and ephemeral streams gurgled in the ravines and gullies.

Thanks to the sandstone geology, the dirt road wasn’t as muddy as most other local trails would be. Although heavily eroded from numerous Winter storms, it was still near the top of my list of places to run during periods of wet weather.

In the aftermath of yesterday’s storm the weather was spectacular. The temperature was warm enough to run in shorts and short-sleeves but still comfortable chugging up Rocky Peak Road’s steep hills. Puffy cumulus clouds filled the sky, creating postcard views at every turn.

Clouds developing over the San Fernando Valley (thumbnail)
Clouds developing over the San Fernando Valley. Click to enlarge.

More focused about getting up the hill than any weather concerns, I continued past the top of the Hummingbird Trail and through a gap in the rocks to a section of road with a good view of the San Fernando Valley and San Gabriel Mountains.

I’d been in a situation similar to this several times on Rocky Peak. As a storm moves east from Los Angeles, energy circulating around the low can sometimes result in “back-door” precipitation. In this scenario, clouds build-up over the mountains to the north and then drift over the San Fernando Valley, producing showers — and sometimes — thunderstorms.

But today’s scenario was a bit more complicated. A much larger area, extending east to the San Gabriel Mountains, was rapidly destabilizing. What had been a picturesque sky at the start of the run was now congested and ominous. The question wasn’t so much if it was going to rain, but if a thunderstorm was going to develop.

As I continued up the road, the sky darkened, the temperature cooled, and the wind became more gusty and fitful. A little chilly, I pulled on my arm sleeves. I laughed nervously as I mistook the roar of a passing jet for thunder. That was a jet, right?

When people say they are “doing Rocky Peak,” they are often referring to a high point on Rocky Peak Road that is west of the actual peak and about 2.4 miles from the trailhead. The final climb to this high point is a good one — gaining about 450 feet over three-quarters of a mile.

The road on this stretch is oriented in such a way that the terrain hides the view to the north. I was anxious to get to the top of the hill so I could get a better idea of what the weather was doing. As I worked up the road, I would occasionally feel the cold splash of a raindrop on one leg or the other.

Doppler radar of strong thunderstorm over Rocky Peak (Thumbnail)
Doppler radar of strong thunderstorm over Rocky Peak. Click to enlarge.

Nearing the top, I thought, “I may get wet, but at least there’s been no thunder.” Within seconds of that proclamation, and as I reached the highest point, there was a long, loud, crackling peal of thunder.

One look at the sky and all thoughts of continuing to the Chumash Trail were gone. I turned around and started running down the hill, hoping to avoid the worst of the storm.

First one pea-sized hailstone hit the ground, then another, and then a sleety barrage of rain and hail poured from the sky. Instantly soaked, I shuddered as thunder echoed overhead and cold rain ran down my back. Muddy water flowed in rivulets down the sodden road and I cautioned myself to run fast, but not too fast.

I didn’t expect to outrun the storm, but hoped I might move to a part of it that was less intense. And that’s what happened. As I descended, the deluge gradually diminished. Most of the activity seemed to be behind me and a little to the east.

Severe thunderstorm over Porter Ranch - Northridge area (Thumbnail)
Severe thunderstorm moving into the Porter Ranch – Northridge area. Click to enlarge.

By the time I got down to the Hummingbird Trail, it was only sprinkling. The strong cell that had been over Rocky Peak had drifted southeast, and was now over the Porter Ranch – Northridge area.

National Weather Service Doppler Radar tells the story. At the start of the run there were scattered, mostly weak echoes. At 3:06 pm, as I was starting up the last long hill, a cell northwest of Rocky Peak was developing and drifting southeast. Over the next 16 minutes the cell continued to move southeastward and strengthen, and at 3:22 pm was over the Rocky Peak area. I turned around and started down as the cell moved into that area.

The cell over Rocky Peak continued to strengthen, and at 3:39 pm had drifted over the Porter Ranch – Northridge area. At 3:44 pm the NWS issued a Severe Thunderstorm Warning for Western Los Angeles County.

Here are a GOES-18 satellite loop and Doppler Radar loop that show the development and track of the Rocky Peak thunderstorm.

Some related posts:
– Rainy Weather Running on Rocky Peak Road
– Running Between Raindrops: Chumash Trailhead to Rocky Peak
– Thunderstorm