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FXUS66 KSGX 072008 AFDSGX AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SAN DIEGO CA 200 PM PDT TUE SEP 7 2010 .SYNOPSIS... UPPER LEVEL LOW PRESSURE OVER THE WEST WILL CONTINUE THE COOLING TREND THROUGH THURSDAY WITH TEMPERATURES WELL BELOW SEASONAL AVERAGES. A DEEPER MARINE LAYER WILL CAUSE LOW CLOUDS...WITH LOCAL FOG AND DRIZZLE WEST OF THE MOUNTAINS DURING THE NIGHTS AND MORNINGS WITH ONLY PARTIAL AFTERNOON CLEARING NEAR THE COAST. IT WILL BE WARMER WITH LESS EXTENSIVE LOW CLOUDS TOWARD THE WEEKEND UNDER WEAKER LOW PRESSURE. && .DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES... A TROUGH OF LOW PRESSURE AMPLIFYING ALONG THE WEST COAST HAS DEEPENED OUR MARINE LAYER AND KEPT OUR COASTAL EDDY SPINNING. LOW CLOUDS HAVE BEEN VERY SLOW TO CLEAR TOWARD THE COAST. THE TROUGH WILL CONTINUE TO AMPLIFY AND DIVE INTO CALIFORNIA WEDNESDAY AND THURSDAY IN AN UNSEASONABLE WAY...BRINGING EVEN COOLER WEATHER AND EVEN MORE CLOUDS. THE DEPTH OF THE CLOUD DECK WILL MAKE PATCHY DRIZZLE DURING THE NIGHTS AND MORNINGS THROUGH THURSDAY. AND RECORD LOW MAX AND MIN TEMPERATURES ARE PROBABLE THOSE DAYS. AS THE TROUGH MOVES THROUGH THE REGION THERE WILL BE BRISK GUSTY WINDS IN THE MOUNTAINS AND DESERTS MAINLY WEDNESDAY AND THURSDAY. ON FRIDAY THE TROUGH MOVES OUT AND HEIGHTS ALOFT BEGIN TO REBOUND AND THIS WILL MEAN A MODEST WARMING TREND AND SHALLOWING OF THE MARINE LAYER. WHILE WE WILL GET WARMER AND DEAL WITH LESS EXTENSIVE CLOUDS...A WEAK TROUGH PATTERN WILL CONTINUE INTO EARLY NEXT WEEK AND IT WILL STRUGGLE TO GET BACK TO SEASONAL WEATHER. && .AVIATION... 071900Z...MARINE LAYER AROUND 3K FT AND RISING. IT IS EXPECTED TO BE AROUND 4K FT BY WED MORNING. BASES AROUND 2500 FT MSL TONIGHT THROUGH WED MORNING. LOCAL VSBY 3-5SM INLAND IN THE MORNINGS. SOME DRIZZLE OR LIGHT RAIN TONIGHT THROUGH WEDNESDAY MORNING WITH POSSIBLE DRIZZLE CONTINUING OCCASIONALLY AFTERNOON IN THE COASTAL AREAS. STRATUS REMAINING IN THE COASTAL AREAS WEDNESDAY AND POSSIBLY IN THE WEST PART OF SOME INLAND VALLEYS. SCATTERED TO CLEAR INLAND AROUND NOON WEDNESDAY. STRATUS RETURNING MID AFTERNOON WEDNESDAY. && .SGX WATCHES/WARNINGS/ADVISORIES...NONE. && $$ PUBLIC...MM AVIATION...WHITLOW |
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