NWS Forecast Discussion
000 FXUS66 KSGX 291047 AFDSGX AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SAN DIEGO CA 345 AM PDT THU JUL 29 2010 .SYNOPSIS... A TROUGH OF LOW PRESSURE ALONG THE WEST COAST AND HIGH PRESSURE OVER THE SOUTH CENTRAL STATES WILL KEEP SOUTHWEST CALIFORNIA ON THE FRINGES OF GREATER MONSOONAL MOISTURE TO THE EAST. THIS WILL BRING SOME MID AND HIGH CLOUDS AT TIMES WITH SOME AFTERNOON CLOUDS OVER THE MOUNTAINS. THE MARINE LAYER AND ONSHORE FLOW WILL KEEP COASTAL AREAS COOLER WITH SEASONALLY HOT DAYS INLAND. && .DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES... A TROUGH OF LOW PRESSURE OFF THE WEST COAST WILL MOVE INLAND THROUGH THE PACIFIC NORTHWEST FRIDAY NIGHT AND SATURDAY. THIS TROUGH OF LOW PRESSURE WILL LINGER NEAR THE WEST COAST THROUGH NEXT WEEK. BROAD EAST WEST HIGH PRESSURE WILL REMAIN CENTERED OVER THE SOUTH CENTRAL STATES. LIMITED MOISTURE IN SOUTH TO SOUTHEAST FLOW ALOFT WILL BRING SOME MID AND HIGH CLOUDS AT TIMES WITH SOME AFTERNOON CLOUDS OVER THE MOUNTAINS. THE 06Z NAM GENERATES SOME LIGHT CONVECTIVE PRECIPITATION FROM THE MID LEVEL MOISTURE SPREADING NORTHWARD ACROSS THE EASTERN DESERTS OF SOUTHERN CALIFORNIA EARLY THIS MORNING. THE WESTERN FRINGES OF THIS MOISTURE EXTENDS INTO EASTERNMOST PORTIONS OF SOUTHWEST CALIFORNIA. IT IS POSSIBLE THERE COULD BE SOME VIRGA FROM MID LEVEL CLOUD BASES FOR THESE AREAS EARLY THIS MORNING. OTHERWISE...THE MARINE LAYER AND ONSHORE FLOW WILL KEEP COASTAL AREAS COOLER THAN SEASONAL AVERAGES WITH AREAS OF NIGHT AND MORNING LOW CLOUDS AND FOG SPREADING INTO WESTERN PORTIONS OF THE VALLEYS EACH NIGHT...THEN CLEARING BACK TO NEAR THE COAST EACH AFTERNOON. INLAND DAYTIME TEMPERATURES WILL BE SEASONALLY HOT...BUT STILL NEAR TO SLIGHTLY BELOW AVERAGE. && .AVIATION... 290915Z...A PATCH OF STRATUS ALONG THE SAN DIEGO COUNTY COAST IS SLOWLY EXPANDING NORTHWARD. CIGS BETWEEN 1200 AND 1500 FT MSL WILL REMAIN OVER THE CENTRAL AND SOUTHERN SAN DIEGO COUNTY COASTAL AREAS INCLUDING KCRQ AND KSAN THROUGH THE MORNING. AREAS TO THE NORTH INCLUDING KSNA WILL ONLY SEE A COUPLE HOURS OF SCT-BKN STRATUS AROUND SUNRISE. STRATUS WILL SCATTER OUT BETWEEN 17Z AND 19Z AND RETURN AFTER 03Z. ABOVE THE MARINE LAYER...SCT ALTOCU BETWEEN FL100 AND FL150 AND UNRESTRICTED VSBY. FEW-SCT CU WILL FORM OVER THE MTNS IN THE AFTERNOON. && .SGX WATCHES/WARNINGS/ADVISORIES... CA...NONE. PZ...NONE. && $$ PUBLIC...MARTIN AVIATION/MARINE...SS NWS ON THE WEB AT WEATHER.GOV/SANDIEGO
NWS SGX Office Area Forecast Discussion