STORM2K

FXUS66 KSGX 240435
AFDSAN

EXTREME SOUTHWESTERN CALIFORNIA AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CALIFORNIA
930 PM PDT MON JUN 23 2003

.SYNOPSIS...A LOW PRESSURE TROUGH MOVING ACROSS CALIFORNIA WILL BRING GUSTY WINDS TO THE MOUNTAINS AND DESERTS TONIGHT. THE PASSAGE OF THE TROUGH WILL RESULT IN A SHALLOWER MARINE LAYER AND A BETTER CHANCE FOR AFTERNOON CLEARING TUESDAY. BUILDING HIGH PRESSURE WILL BRING WARMER WEATHER THROUGH THE END OF THE WEEK.

.DISCUSSION...THE END OF THE JUNE GLOOM IS NEAR. AN UPPER LEVEL TROUGH SWEEPING ACROSS SOCAL BROUGHT SOME COOLING ALOFT AND BETTER MIXING OF THE MARINE LAYER THIS AFTERNOON...AND SOME AREAS WEST OF THE MTNS ACTUALLY SAW THE SUN. SPEED MAX ASSOCIATED WITH THIS TROUGH IS BRINGING GUSTY WINDS TO THE DESERTS THIS EVENING WHICH WILL SUBSIDE LATER TONIGHT.

SATELLITE IMAGERY SHOWS THE MARINE LAYER CLOUDS ARE FILLING BACK IN QUICKLY WEST OF THE MTNS. THE 00Z SOUNDING SHOWED THE MARINE LAYER DEPTH WAS 3000 FEET...QUITE A DECREASE FROM THE 5000 FOOT DEPTH THIS MORNING...AND THIS SHOULD ALLOW THE SUN SHOULD BREAK OUT IN MOST AREAS WEST OF THE MOUNTAINS TUESDAY AFTERNOON.

HEIGHTS RISE FROM 582 DM TUESDAY MORNING TO 588 DM WEDNESDAY MORNING AS RIDGE BUILDS OVER THE REGION...AND TEMPS WILL FINALLY RETURN TO WHERE THEY SHOULD BE FOR THIS TIME OF YEAR. THE WARM...DRY WEATHER WILL PERSIST THROUGH THE END OF THE WEEK WITH A WEAK OFFSHORE PATTERN SETTING UP OVER THE SOUTHWEST.

.SAN...NONE.

MOEDE

Cool... hope you enjoy the warm weather, Joshua... It's REALLY hot here... getting into the lower and mid 90s today! :o :o

Joshua, how long did the marine layer stay in place and what is the average amount of time it is in place?

As far as I remember, over the years, it stays for a number of weeks. You obviously would know how long on average and how long it was this time around.

Yes, I'd also like to know that... seems like it's been over you for quite a period of time... :o

Yes it has been here for a long time ... since the beginning of the month almost. This will be the first extended period where we have a lot of sun.

EXTREME SOUTHWESTERN CALIFORNIA AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SAN DIEGO CALIFORNIA 930 PM PDT TUE JUN 24 2003

.SYNOPSIS...HIGH PRESSURE BUILDING ALOFT WILL BRING HOT WEATHER THROUGH THE END OF THE WEEK. SUNNY SKIES ARE EXPECTED ACROSS THE REGION EXCEPT FOR LINGERING MARINE LAYER CLOUDS NEAR THE COAST. THE RIDGE WILL WEAKEN SATURDAY AND SUNDAY AND A DEEPENING MARINE LAYER WILL BRING COOLER WEATHER BACK TO THE COASTAL SECTIONS...WHICH WILL SLOWLY WORK INTO THE INLAND VALLEYS EARLY NEXT WEEK.

.DISCUSSION...SKIES WERE CLEAR THIS EVENING...FOR A CHANGE. THE ONLY CLOUDS SHOWING UP IN THE SATELLITE WERE WELL OFF THE COAST SOUTH OF SAN CLEMENTE ISLAND...AND MOVING SOUTHWEST. PRESSURE GRADIENTS HAVE TRENDED OFFSHORE ALL DAY AND WILL CONTINUE THROUGH THURSDAY AS SURFACE HIGH PRESSURE BECOMES ESTABLISHED OVER THE GREAT BASIN. THE MARINE LAYER WAS AROUND 2100 FEET AT 00Z AND WILL SHRINK THE NEXT SEVERAL DAYS. AT THE SAME TIME...INCREASING HEIGHTS AND THICKNESSES WILL RESULT IN A RAPID WARMUP IN ALL AREAS.

THE RIDGE STRENGTHENS THURSDAY AND FRIDAY WHEN TEMPS WILL SOAR ABOVE 100 IN SOME INLAND AREAS...AND INTO THE 80S AND 90S IN THE MTNS. COACHELLA VALLEY TEMPS COULD EXCEED 110. THE ONLY THREAT FOR CLOUDS WILL BE ALONG THE COAST AS A STRONG INVERSION SETS UP WHICH MAY KEEP MARINE LAYER CLOUDS LINGERING AT THE BEACHES IN THE AFTERNOONS.

THE RIDGE WILL BEGIN WEAKEN OVER THE WEEKEND. SLIGHTLY STRONGER ONSHORE GRADIENTS AND A DEEPER MARINE LAYER WILL BRING SLIGHT COOLING TO THE COASTAL AND INLAND AREAS. HOWEVER...MTNS AND DESERTS WILL STILL BE QUITE WARM THROUGH THE WEEKEND.

OH, so that's why you are happy that it's going to end... Enjoy the nice weather.