Weather Synopsis – April 4, 2024

James Murakami

Thu4th59/48Amended…Mostly cloudy through the evening. Slight chance of light showers through the evening.
Fri5th57/46Amended…Good chance of overnight showers. Partly to mostly cloudy day with a chance of occasional daytime showers, mainly in the morning. Breezy at times. Decreasing clouds and wind in the evening.
Sat6th62/48Mostly sunny day. Clear evening.
Sun7th63/49Chance of some morning low clouds; Otherwise, mostly sunny day with scattered high clouds and possibly breezy at times in the afternoon. Partly cloudy evening.
Mon8th67/52Sunny day. Clear evening.


The recent warmer than normal weather seems like a distant memory already. A Pacific, upper level trough is bringing showery, cold weather to much of the state today. In southern California, the best shot at widespread showers should be tomorrow (early morning in L.A. County). While the weekend should be a dry one in the Southland (for the most part), no significant warming trend is expected (that’ll have to wait till about Tuesday).

The center of the aforementioned trough was just west of the Bay area this afternoon. Unlike some of the recent storms, the center isn’t forecast to pass through southern California (should enter Nevada around the Lake Tahoe area). There won’t be much over water trajectory with this storm when its axis passes through the Southland. It’s a rather cold storm (snow levels may fall to as low as 2500 feet briefly tomorrow), but the storm doesn’t have any well defined band of precipitation. The limited, available water vapor should keep storm totals mostly on the low side this time around. Rainfall in the lowlands should be generally under a quarter inch (maybe tenth inch or less across L.A. County). Somewhat higher totals may occur to the south and east of L.A. County (but still west of the mountains). However, lowland rainfall should still be under a half inch, for the most part. The one caveat could be where isolated, brief-lived thunderstorms occur (cold air instability). Storm totals with thunderstorms might be able to approach an inch, but this won’t be widespread in areal coverage. Snowfall at the local resorts should be mostly under ten inches (no more than an inch down to 3000 feet).

While there may be a few residual, mountain showers early Saturday (mainly San DIego County), most of that day should be a clear one in the Southland. Marine layer clouds could make a brief return west of the mountains on Sunday, but any widespread blanket of low clouds aren’t expected till the evening hours. A predicted, “inside slider” type trough is expected to cause a good on-shore flow pattern for Sunday. Breezy weather in the interior is likely that day. I can’t rule out patchy drizzle with the marine layer Sunday evening (occurred this morning). There could also be some brief showers over parts of the north facing Tehachapi Mountains. Most of the daytime hours should be clear on Monday, but some computer model forecasts do indicate some chance of a few mountain showers Monday afternoon. People interested in viewing the solar eclipse Monday morning shouldn’t have to contend with cloud cover (maximum of 49% of sun’s disk covered around 11:12 AM in Los Angeles…use appropriate equipment for safe viewing).

Like earlier this week, another, moderate strength high pressure should build into the state by Tuesday. A marginal, off-shore flow should promote noticeable warming for a few days (longer duration than the concluded warm spell). There is some chance that even parts of the inland, coastal plain may approach 80 degrees for a day or two next week (sometime Wednesday-Friday period). Some valley locales may reach the mid-80s at the height of next week’s warm spell.

Cooler weather should develop over the subsequent weekend (weak on-shore flow). At this point, no cooler than normal weather is anticipated during the cool down period.

Next issued forecast/synopsis may be on Tuesday, 9 April.