Leon,s Backyard WX Report

FLASH FLOOD POTENTIAL INDEX FOR EXTREME SOUTHWESTERN CALIFORNIA A weak monsoonal flow will produce a few isolated thunderstorms in the mountains this weekend. The showers and thunderstorms may become more widespread early next week as the flow increases. The best chance for heavy rainfall will be near the mountains The atmosphere will be fairly moist and unstable Flash Flood Codes:  GREEN: NONE    YELLOW: LOW   ORANGE: MODERATE  RED: HIGH NWS LAS VEGAS  through the week leading to isolated to scattered thunderstorms. The best…

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Moisture will begin to increase over the area today and will spread north and west across much of the area Sunday and Monday as a low pressure system moves west across far southern Arizona and California. Most of the activity today will be over Lincoln and Mohave Counties. For Sunday through Wednesday, Mohave Clark and San Bernardino Counties will have the best chances of thunderstorms. High pressure over northern Nevada will keep thunderstorms chances to a minimum over much of Lincoln, Nye and Inyo Counties Sunday through Wednesday.

Warm and very dry today***  Temperatures will be around 5 degrees above normal today as high pressure over the Great Basin strengthens. Maximum temperatures will be in the 80s to low 90s across the mountains and 90s to 102 in the valleys. Minimum humidity will remain mainly in the single digits and teens away from the coastal areas today. Temperatures will cool and humidity will increase Sunday through early next week as high pressure weakens and a weak area of…

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Gusty north winds across Santa Barbara County and the Grapevine tonight***   Strengthening high pressure over Nevada will bring a few degrees of warming to the region both today and Saturday. Maximum temperatures will be in the upper 70s and 80s across the mountains and upper 80s and 90s in the valleys today. Minimum humidity will be mainly in the single digits and teens away from the coastal areas through Saturday. North winds of 10 to 20 mph with gusts…

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An area of scattered thunderstorms continued overnight across much of the deserts from areas near I-40 toward the Arizona border southwestward into the Coachella and Imperial Valleys. These storms are expected to slowly dissipate later this morning but a few wet thunderstorms may reach the desert side of the San Jacinto Mountains and the Cleveland N.F. in San Diego County. There will be a lull in convection during the early afternoon hours, but isolated thunderstorms may develop toward evening across…

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Hot and dry conditions will maintain an elevated threat for large fire away from the deserts and coast this weekend. Rapid rates of spread and long range spotting will be possible on any new ignition that gets started in a large dead fuel bed during the afternoons. The potential for large fire will remain elevated across most of Central California early next week as dry conditions continue, but the large fire threat will decrease across Southern California as humidity increases…

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INLAND VALLEYS OF SO CAL THURSDAY… Sky/weather………Mostly sunny. Max temperature…..89 to 98. 24 HR TREND……Up 1 degree. Min humidity……..20 to 30 percent. 24 HR TREND……Down 5 percent. WIND (20 FT)……..Variable 2 to 5 mph becoming west 6 to 10 mph with gusts to 20 mph in the afternoon. LAL……………..1.   .THURSDAY NIGHT… Sky/weather………Mostly clear. Min temperature…..63 to 68. 24 HR TREND……Up 2 degrees. Max humidity……..60 to 70 percent. 24 HR TREND……Down 15 percent. WIND (20 FT)……..Winds west 6 to 10 mph…

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***Turning very warm again this weekend***   Cooler onshore flow will continue today courtesy of a weak trough over the Pacific Northwest.  Readings this afternoon will range from the 70s at the coast to the lower 90s in the valleys to around 100 in the San Joaquin Valley.  Isolated thunderstorms will still be possible across the highest elevations of the Sierras eastward into sections of the Inyo National Forest and Death Valley N.P.  The areas with lowest afternoon RH (outside…

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