The Santa Ana Winds are about to start soon, with increased power overnight and into Sunday morning. Some more snow is projected for Big Bear with my winter weather advisory tonight. Trends are increasing for the low level snow event surrounding Christmas so read on for all those details.
The Santa Ana Winds are about to start, with a north flow start time after 9pm tonight.
Being we do have a 100kt upper level jet out of the north as well, the winds will push far from the mountain passes, surfacing into the Los Angeles Basin as well, including Long Beach, La Mirada/Whittier, and the San Gabriel Valley. Strong wind gusts should moving out of the passes into the metros just after 9pm tonight, gusting all night.
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If you’re planning on flying in or out of Ontario International Airport, please check for delays or cancellations as these will be happening by the morning.
Areas in Banning/Hemet/San Jacinto and Escondido will have to wait till Sunday morning to get any stronger gusts as this is a northerly wind event, not an easterly one. I do not expect the strong gusts to surface in Downtown San Diego .. but they will for Camp Pendleton and most of Orange County.
Just as with the last event, strong gusts will hit with this event for the Desert areas as well, including the Morongo Basin to Imperial County.
Winds will calm later on Sunday as the system moves off to the east and we lose the upper support.
The Southern California Weather Force Winter Weather Advisory was issued this afternoon for the overnight into Sunday morning snowfall risk for Upper Big Bear.
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1-2 inches of snow in spots tonight for the Upper San Bernardino Mountains .. The reason for this is because as the northerly winds kick up, moisture rounding the system out of the north will bunch up against your mountains later this evening into the tonight .. reintroducing the chance of snowfall once again. Some areas will see a dusting/nothing while others on the Eastern Range will see some snow.
Imperial Valley to Blythe will continue the risk tonight for convective activity … But Arizona will see the full brunt of the upper dynamics for shower/thunderstorm and mountain snow activity.. Thundersnow is also possible in Arizona Mountains.
As for the arctic blast I’ve been talking about for awhile now, the risk is elevating more each day. As we near between December 22nd and the end of the month, surrounding Christmas … we will have a ridge between Canada and Alaska. This will result in a storm track that rounds the top of it and through Western Canada and straight south into California. This type of track is the exact pattern we need to bring low elevation to Southern California, including of course Las Vegas and our desert and valley areas.
A system must dive down into the area surrounding Christmas … and suck in a northeast winds (Santa Ana Wind Pattern) in the low levels while providing the moisture from the Pacific. This combo will allow the snow level to bottom at the valley floor.
Current progs here at Southern California Weather Force shows a 50 to 65 percent risk of this happening, which for this far out is pretty good. All my models point to much colder than average temperatures between December 21st and New Years Eve … so the last part of December no doubt will feel a lot like Christmas.
So there you have it … events near and coming up …
Stay tuned to Southern California Weather Force for any additional updates
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