Category Archives: nature|weather

nature, nature|clouds, nature|weather, photography, photography|landscape, running, running|adventures, weather, weather|southern california

Conejo Valley Sun and Boney Mountain Clouds

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Conejo Valley from the north side of Boney Mountain.

Pushed up and over Boney Mountain’s two thousand foot western escarpment, Pacific winds condense into thick cloud along its jagged crest. At times breaking free of the mountain’s grasp, patches of cloud drift eastward, creating a patchwork of sun and shadow on the steep slopes, and in the valley below.

In the distance, the Ventura Mountains gleam with a mix of snow and cloud, and below the fields of Satwiwa stand out vibrant and green. At my feet hundreds of purple shooting stars dance in the wind; and nearby yesterday’s rain seeps and trickles from moss to lichen on the scraggy volcanic rock.

It is a remarkable morning, and an exceptional one to be doing the Boney Mountain north side loop. Here’s a short video of some of the views along the way.

nature, nature|weather, photography, photography|landscape, weather, weather|el nino, weather|southern california

A Welcome Break in a Busy Rainy Season

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The weather has calmed in Southern California. Medium range models are forecasting a break of about a week in what has turned out to be a very busy rain season. Over the last 90 days a precipitation pattern typical of El Niño has emerged in the western U.S. This is reflected in rainfall total for Downtown Los Angeles (USC), which is now at 13.2 inches for the water year — 4.78 inches above normal.



The dry weather could not have come at a better time for those affected, or threatened, by mudslides and debris flows. This small slump along a road at Ahmanson Ranch is indicative of the instability that can develop when soil becomes saturated. Had our recent wet pattern been more persistent, mudslides and debris flows might have been much more widespread and devastating.

nature, nature|weather, photography, photography|landscape

Rocky Peak Vernal Pool

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Rocky Peak vernal pool

One of about a dozen vernal pools in the Rocky Peak area. More than just a puddle, these rainy season pools form as a result of the area’s unique geology.

In my experience, excessive rainfall is not necessary for the pools to form. Normal month-to-month seasonal precipitation is usually sufficient. Their persistence depends on several factors, but in a season with normal to above average precipitation, the pools can last for several months.

From Wednesday’s run on Rocky Peak.

Related post: Vernal Pool at China Flat

nature, nature|clouds, nature|weather, photography, photography|landscape, weather, weather|el nino, weather|southern california

Pattern Change Ahead

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Patterned altocumulus clouds near Los Angeles

Computer models and other tools continue to forecast a shift to an “El Nino like” upper flow pattern next week that could result in an extended period of wet weather in Southern California. I’ll be updating Southern California Weather Notes on Wednesday with additional info.

The photograph of patterned altocumulus clouds is from this afternoon’s trail run along the northern boundary of Ahmanson Ranch, near Los Angeles.

nature, nature|weather, nature|wildflowers, photography, photography|wildflowers, weather, weather|el nino, weather|southern california

Rainy Season Wildflowers and Weather

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Milkmaids (Cardamine californica) along the Bulldog Motorway, in the Santa Monica Mountains.

Following the little bit of wet weather we had at the end of the year, Southern California has been enjoying idyllic weather with highs in the 70’s and 80’s. Southland cities recorded the highest temperature in the continental U.S. several days this week. Tuesday San Diego recorded a high of 84 degrees, tying Kalaeloa, Hawaii for the warmest temperature in the nation.


Nightshade
The weather’s been great for trail running — and for the chaparral plants. Alternating periods of wet weather and warm weather have encouraged growth and flowering, and I’ve been seeing a number of rainy season wildflowers. In addition to the milkmaids in the photograph above, some of the early bloomers include nightshade, peony, shooting star, woolly blue curls, prickly phlox, chaparral mallow, rattlesnake weed, and several others.

Rainfall totals in Southern California this rain season to date have generally ranged from an inch or so above normal to an inch or so below (WRCC). As of yesterday, Downtown Los Angeles (USC) precipitation was 0.56 inch above the norm for the water year to date. Although January has been dry so far, it looks like we may see a shift to more seasonable — and wetter — weather around midweek next week.

The precipitation pattern we’ve seen on the West Coast so far this rain season has a bit of an El Nino flavor to it, and that pattern may become better defined in the coming weeks. Today’s 6-10 day and 8-14 day precipitation outlooks from the Climate Prediction Center indicate above average rainfall for Southern California. We’ll see!

nature, nature|clouds, nature|weather, photography, photography|landscape, trails, trails|smmc open space, weather, weather|southern california

Residual Showers

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Got caught in some showers this afternoon on Rocky Peak, returning from a rambling trail run from the San Fernando Valley over into Simi Valley.

This was one of those “not sure where I’m going” runs that unfolded as it progressed. It started near Chatsworth Reservoir at Chatsworth Oaks Park, worked over to Santa Susana State Historic Park, then up the Old Stagecoach Road. At the top of the old Stagecoach Road, I picked up the Upper Stagecoach Trail and followed that to Santa Susana Pass and the 118 Frwy. From there it was a short distance down the west side of Santa Susana Pass Rd. to the Lower Stagecoach Trail, which took me to Corriganville.

Once down in Simi Valley there are four trails that ascend to Rocky Peak road, and my return route. From the shortest to the longest, they are the Wildlife Corridor trail, Hummingbird Trail, Chumash Trail and the Marrland/Las Llajas trail. Not sure how long it would take to get back to the SFV, I finally decided on the Chumash Trail.

Running up the Chumash Trail, the wind picked up, the clouds began to lower and thicken, and the temperature dropped. Minutes after turning right onto Rocky Peak road the showers began, and it wasn’t long before the sleeves came out of the pack.

The return trip, with a net elevation loss, went a little quicker than expected. Next time I’ll have to give the Las Llajas option a try. That would extend the run from about 17 miles, to something over 20. The approximate elevation gain/loss on the 17 mile version was a little under 3000 ft.

Related post: Old Santa Susana Stage Road