Hot Fourth of July and start of the monsoon season!

NWS SGX says...Temperatures will be on the rise this holiday weekend, as high pressure builds into the region. A weak southeasterly monsoonal flow will bring a slight chance for mountain and high desert thunderstorms on July 4th.




Monsoonal moisture in southeast flow aloft will gradually filter into Southern California through early next week. It may be enough for a few clouds over the mountains this afternoon and a few thunderstorms with limited rainfall...dry lighting...and gusty winds for Sunday afternoon and early evening.




The models are showing a greater influx of moisture for Sunday night into Monday. Probability of precipitation have been increased some. If later runs are consistent with this trend...probability of precipitation in the mountains and deserts may need to be increased more for Monday and high temperatures in the inland areas...especially the lower deserts...may need to be lowered some. That will be the general trend for Monday through Thursday...high temperatures a little lower offset by higher humidity.




Coastal low clouds may be quite limited through middle week and the chance of afternoon and evening thunderstorms in the mountains and deserts will continue. By late in the week...weak southwest flow aloft may develop bringing minor cooling and drying. However...this push of dry air is weak and may not completely dislodge the moisture that will be in place by that time nor displace it too far to the east if it does. The current forecast shows only gradual drying and decreasing probability of precipitation going into next weekend.








UV Index is still extreme for the SW USA.


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