UCLA Weather

from the Department of Atmospheric and Oceanic Sciences.

Friday - 12:52pm

High Clouds


High - 71°

Low - 54°

Today: Mostly sunny day with scattered high clouds. Scattered high clouds in the evening.

Five Day Forecast

Latest Average Hourly Temperatures

New synopsis should follow around 3 PM.

Previous Synopsis: Weak off-shore flow redeveloped last night into this morning. Significant wind in Santa Ana wind prone areas was restricted to higher elevations, and most wind gusts were no higher than 30 mph. However, one of the more typically windy locales (Whitaker Peak near Castaic Lake) reported a peak gust to 51 mph last night. Wind speeds have lowered early this afternoon, and that should last through most of tomorrow afternoon, thanks to a passing, weak storm well to our north. Another increase in the off-shore flow is expected tomorrow evening into early Saturday. However, the wind pattern should be no worse than what occurred last night./early today.

The off-shore flow has promoted noticeable, daytime warming today in most areas (just minor warming near the immediate coast). Widespread 70 degree weather prevails with a few locales flirting with the 80 degree mark early this afternoon. While upper air temperatures are predicted to rise a little over today's levels, high pressure aloft is forecast to weaken slightly (passing storm well to our north). The surface off-shore flow should also weaken slightly. Thus, daytime temperatures in most areas west of the mountains should be slightly lower tomorrow than today. (still warmer than normal). High pressure aloft is forecast to rebound on Saturday. This may promote slightly stronger, low level, off-shore flow (computer model agreement isn't unanimous though). So, temperatures that day might turn out a bit higher than it gets tomorrow (should at least match Friday's levels).

There was a time (a week, week and a half ago) when some of the longer range models were predicting some wet weather reaching southern California late this weekend. That scenario started to fade a couple days ago. The latest forecasts show rain barely reaching San Luis Obispo County early Sunday. In the mountains, wet weather shouldn't get south of the southern Sierras. So, Sunday's weather should feature marine layer weather west of the mountains, and temperatures should be near seasonal levels in most areas (possibly slightly cooler than normal, depending on how well defined the marine layer gets). It should get breezier in the interior with this predicted, "inside slider" type trough. How windy it gets, however, will depend on how close the core of the trough gets to the Southland.

Off-shore flow should return with the passage of the "inside slider". It's still not clear how windy the off-shore flow will be, but there is potential for it to get windier than the currently waning event (breezy weather could affect lowland areas). At this point, I've included a chance for breezy weather in the campus area Sunday night into early Monday, but confidence in this aspect of the weather is low. Another burst of stronger winds could also occur around the middle of next week with another, potential, "inside slider" trough (model solutions are quite varied...could be quite windy or could be barely breezy in Santa Ana wind prone areas).

Regardless of how windy it may get for a time next week, warmer than normal weather should prevail for most or all of next week. If a few model solutions are right, a foretaste of mid-spring weather may occur at the end of the month/beginning of February. That scenario includes widespread 80 degree weather with some areas nearing 90 degrees by the subsequent weekend. Of course, there are plenty of model solutions showing much less heat (getting only slightly above normal levels). The only common theme is dry weather for the Southland next week.

UCLA Forecasts and analyses are written by James Murakami

– posted: 2020-01-24

Data and technology is provided by UCLA's Department of Atmospheric and Oceanic Sciences

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