Thursday, August 30, 2007
Heat, humidity and risk of thunderstorms on Thursday
(Eclipse, Tuesday, August 28th, 2007)-Infrared imagery-
***Updated at: 11:33am/pdt, Thursday, August 30th, 2007***
Another hot day for the southland...but the big change on Thursday compared to the past couple of days is the higher humidity. Dewpoints in the upper 50s to the middle 60s for the most part. This will make warmer than it actually is.
Due to these dangerous conditions... NOAA's National Weather Service has issued a "Excessive Heat Warning" for the valleys of the Inland Empire, San Diego county and the mountains and valleys of L.A. county for Thursday afternoon.
In these areas... heat indices will range from 102 to 108 degrees over the valleys of the Inland Empire and San Diego county... 105 to 110 over the valleys and lower elevations of the mountains of Los Angeles county Thursday afternoon.
As earlier mentioned the airmass over the southland has moistened up quite a bit since yesterday... due the moist air mass, the heat and an upper level disturbance moving over the region... Isolated to scattered showers or thunderstorms are possible Thursday and Thursday evening across the mountains and deserts of southern California. There is also a slight risk of thunderstorms over the valleys of the Inland Empire and San Diego county.
The greatest concentration of thunderstorms will be Thursday afternoon over the mountains and deserts of San Bernardino, Riverside and San Diego counties... In these areas there is a chance of strong thunderstorms... which may produce strong and gusty winds to around 45 mph, locally heavy rains which may produce local flash flooding. Due to the heavy rain potential... NOAA's National Weather Service has posted a "Flash Flood Watch" Thursday afternoon and evening for the above mentioned areas.
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