Composite Radar as of 11:40AM 4/21/26 - A weakening Cold Front is moving Southeast across #SoCal. Light rain will be possible across LA/OC locations this afternoon, but accumulations for LA County and areas South and East of it will be light. Many locations will remain dry. #CAwx
A Cold Front will move through #SoCal tomorrow, rapidly weakening by the time it reaches LA County. Best chance for measurable Rainfall will be in Santa Barbara and Ventura Counties as well as higher elevations across the region. #CAwx
Composite Radar as of 3:08PM - 4/13/26 - Isolated Showers and Thunderstorms continue across #SoCal Inland Valleys, higher elevations, and Deserts this afternoon. Activity should wind down this evening.
#CAwx
4/13/26 9:45am Update:
Plenty more #snow fell yesterday!
1-day ❄️: 21.1" (20 cm)
2-day ❄️: 34.6" (34.5 cm)
3-day ❄️: 42.5" (53.5 cm)
Despite still having a below average snowpack due to the record-warm temperatures that we've had all winter, this snow will help a lot.
#CAwater #weather
Musk aside, SpaceX is an excellent company and produces very reliable rockets. Their Dragon capsule reliably transports our Astronauts to and from the International Space Station. SpaceX is also contracted build Lunar Landers so our Artemis Astronauts can land on the Moon.
GOES West Satellite loop 4/13/26 - A Low Pressure System is moving across #SoCal today. Cold air aloft and daytime heating will likely trigger scattered Showers and Thunderstorms through this afternoon, mainly across Inland areas and Foothills/Mountains. #CAwx
Hit and miss showers are hitting us now in inland North County. Very nice downpour, the third of the day. #CAwx #sandiegoweather
HRRR Simulated Radar through the next 48hrs - Showers will become possible across #SoCal this evening through Sunday PM, with most of the rain falling Saturday PM/Sunday AM. There will be some isolated heavy showers and possible Thunderstorms during that time. Showers continue into Sunday PM. #CAwx
A cool, showery pattern sets up across #SoCal Friday evening into Monday, with the bulk of the Rainfall falling Saturday PM/Sunday AM. Snow falling above 5,500ft and a chance for Thunderstorms during that time.
#CAwx
Model Guidance continues to look good for rainfall chances across #SoCal this weekend as we enter another stretch of cooler & unsettled weather. Given the time of year and the potential for cold air aloft, we'll need to keep an eye out for potential Thunderstorms with this setup. Stay tuned. #CAwx
National Weather Service Precipitation Totals for Southern California, for the week of March 29 – April 3rd.
NWS Precipitation totals for #SoCal from this week's System. The precipitation "sweet spot" was Ventura County as well as the higher elevations of Los Angeles and San Bernardino Counties. Many locations received little or no measurable Rainfall. Temperatures rebound into the 80's this weekend.
#CAwx
Composite Radar as of 4:34PM 3/31/26 - Sprinkles and light showers associated with a weak Low Pressure System are moving into #SoCal. Light Showers will be possible overnight and into tomorrow AM, but amounts will be below 0.10" for most areas. Some locations will remain dry. #CAwx
A record-setting marine heat wave has formed off Southern California, and the next few weeks may determine whether it fades or deepens into summer.
Clouds increase and highs stay unseasonably warm. Cooler and cloudy tomorrow. A light shower or 2 possible late day into the evening. Sprinkles possible Wednesday morning. Winds pick up on Thursday. Skies clear and temperatures warm up fast into Easter Weekend. Mid-80s for the holiday. #cawx #Fresno
Cooler weather for #SoCal this week with a chance for some light rain Tuesday PM/Wednesday AM, mainly northern Counties. Many locations won't see any rain at all, but the clouds and cooler weather will be a relief from the recent heat. Temperatures in Coast/Valleys upper 60's/Low 70's. #CAwx
AI Slop.
Friday Update - Deterministic Models and Ensemble Guidance continue to back off on rainfall chances for #SoCal next week. So while some locations may see some light rain, the main impact from next week's Trough will be the cooler temperatures - upper 60's to low 70's Coast & Valleys. #CAwx
Latest Model Guidance for Rainfall totals with next week's system is looking rather unimpressive for #SoCal at the moment, as most of the moisture and dynamics will be focused to our North. The biggest impact will be cooler temps - in the upper 60's to low 70's in Coastal & Valley locations. #CAwx
Another warm week across #SoCal, although not *quite* as hot as last week for most locations. There will finally be some relief early next week as a Trough approaches the West, bringing a much needed cool-down and even some unsettled weather possible by later next week. #CAwx
The West Coast Ridge will weaken somewhat next week and temperatures across #SoCal, although still above average, won't be quite as hot as they've been this week.
There are increasing signs for a Trough & cooler weather developing across the West around the end of the month into early April. #CAwx
A very strong Ridge will dominate #SoCal weather for the next several days, with its strongest impact felt this week with unseasonably hot temperatures. Although it will begin to moderate in strength this weekend, it will continue to keep SoCal warm and dry through next week as well. #CAwx
Summer in March - Many locations across #SoCal will experience triple-digit daytime high temperatures this this week. Deserts and Inland Valleys will likely break above 100° with even some locations along the Coastal Plain reaching 100° by Thursday/Friday. #CAwx #SoCalHeat
Map snapshot depicting the predicted relative anomalousness of surface temperatures from the ECMWF ensemble over the Western U.S. in about a week from now. A a huge region of bright orange and red colors (depicting extremely high warm temperature anomalies) is centered right in the middle of the map, and covers essentially the entire region.
Lots of buzz online about an upcoming major March heatwave for the American SW & California. And in this case, it does indeed appear increasingly likely than an extremely anomalous and even record-breaking heatwave may envelop much of the SW about a week from now.
Time series plot depicting predicted Nino 3.4 region ocean temperature anomalies from the latest (Mar 2026) ECMWF ensemble. It depicts an extremely rapid rise in such temperatures, from modest negative anomalies to strong positive anomalies, by mid-summer 2026--indicative of a transition from weak-moderate La Nina conditions to moderate-strong El Nino conditions over just a few months.
Whew.
All signs are increasingly pointing to a significant, if not strong to very strong, El Niño event. I'll have more to say in coming weeks & months, but for now I'll just say that this is increasingly likely to become a major regional-to-global climate driver in 2026-2027.
Our Next Santa Ana wind event will be in full swing across #SoCal by tomorrow morning for the usual areas. Another warmup over the weekend as Temperatures get up into the 80's along Coast/Valley Locations. Our dry weather pattern expected to continue for at least another 10 days. #CAwx
2/2) Depending on how far West/overwater it moves, there could be a chance for some (mostly light) showers - but the most likely effect will be offshore flow/Santa Ana winds. #CAwx
1/2) Another warm week for #SoCal Coastal/Valley locations this week before an Inside Slider brings cooling late in the week. After that, some Guidance solutions drop a Cutoff Low into the region this weekend. (Cont)...
Map depicting predicted departures from average of temperatures later on Friday across the U.S. Southwest from the ECMWF model. Highly anomalously warm values are depicted nearly everywhere.
Map from NOAA NWS depicting specific locations expected to approach or exceed high temperatures today. Many such locations are noted in southern CA, AZ, NV, and adjacent regions.
Exceptionally warm-to-hot late winter conditions expected across the Southwest through the weekend, peaking Fri and Sat. Numerous daily record highs (and record warm overnight minimums) will be set, along with some Feb monthly records possible. [Thread] #CAwx #AZwx #NVwx
