Lidia is now a post tropical cyclone and is going to move southwest of the forecast area tonight. Rainfall is starting in San Diego County ahead of the spiral arm-band and it will affect most of the forecast area so read on for details.
The outer spiral band of Lidia is still in Baja, Mexico this morning and is moving toward our forecast area. The dynamics within it contain another forcing for widespread precipitation in all metro areas, with the risk of thunderstorms still there as well. There really is no pinpoint for today for who is going to get what in terms of showers and thunderstorms because it is a pretty good outer spiral band but I’ll do my best.
Depending again on convective temperatures like I said yesterday across the Inland Empire would depend who gets what anywhere. Convective temperatures inland were 106 yesterday and today they are in the upper 90s all thanks in part of the increasing dewpoints. Already we have the Inland Empire warming up through the 90s .. as well as the LA/OC/VT/SBA/SLO/KERN zones. This will meet the convective temperatures in many areas today with all this moisture around so you’re looking at popcorn thunderstorms, sometimes strong. Whether your house is going to be hit or not cannot be said due to how widespread the moisture and low/mid/upper dynamics are.
All current alerts on the main page will remain in place … What I am seeing though is who will likely be missed by most of the action today. These areas would be east of the Coachella Valley on I-10 and I-40.
Best areas for explosive thunderstorms will be in the Thunderstorm Watch box, possible far northern in the Los Angeles Mountain/Foothill zones, moving westward into the San Fernando and Santa Clarita Valley today .. with cells also in Ventura and Santa Barbara County … maybe making it all the way to Vandenberg AFB later on. These areas have yet to be hit with the debris clouds to the south and the heating will continue.. .so confidence is high the zones I stated will fire off …
Upper divergence and forcing sets in this evening and tonight across the metros of OC/IE/LA/VT/SBA and the High Desert of Hesperia’s forecast zones. This is the main arm-band and if elevated instability remains as high as it is… a good amount of shower or iso thunderstorm activity in a band-like look on the radar will happen. This would be when you get the most rain in a widespread form, not counting the afternoon/evening thunderstorms that will pour over an area and leave an area 5 miles away dry.
It’ll still remain hot after this for another week or so … Still have a ways to go before the cool-down forecast …