The back-end of Major Pacific Storm Nikita is moving into the region now. Alerts are being shaved from west to east with this passing Ventura County shortly. Lightning has been detected over Los Angeles with it and the impacts will be seen by many people in the LA/OC/IE and even some San Diego County areas so read on for details.
The cold unstable air has become unstable enough for thunderstorms to form over the Los Angeles Basin this afternoon, as my previous forecast noted for today. Dynamics within the low are pretty good in terms of southerly wind over a east-southeast upper level flow which promotes spin in the atmosphere. Low topped supercells in the Orange/Los Angeles County regions, down to parts of the San Diego County region will be likely today with the risk of some hail, waterspouts, small tornadoes, and damaging winds.
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The most impact from the damaging winds and convection will be from Central Orange County coast/basin to the Central San Diego Coast and Basin. This is where the strongest wind + lifting dynamics will make landfall this afternoon and evening. That is shaded in the blue zone on the map in this article
Further east into the Inland Empire, cloud top forecast of -40 suggests this is a thunderstorm potential as well for you and these cells will clear the area after 8-9pm with left-over showers against the San Diego/Riverside Mountains tonight until gone.
All Southern California Weather Force Tornado and Severe Thunderstorm Watches REMAIN IN EFFECT for this secondary band.
This band will deliver more snowfall for above 6,000 FT in the Los Angeles, San Bernardino and Riverside Mountains …
We dry out tomorrow with warming through the end week and into the weekend .. but next week I am monitoring another trough pattern into California so that will be when I return with storm updates ..
Stay tuned to Southern California Weather Force for any additional updates