Zone Forecast: Orange, Riverside, San Diego, San Bernardino: Custom weather delivery, location specific nationwide / Southern California to email, cell, PDA, SMS text, voice

Close this window after viewing.
911Weather.com Weather data when you need it most
FXUS66 KLOX 152029 AFDLOX SOUTHWEST CALIFORNIA AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE LOS ANGELES/OXNARD CA 130 PM PDT THU MAY 15 2008 .SHORT TERM (TODAY-SUN)...STRONG HIGH PRESSURE ALOFT WILL DOMINATE THE WEATHER THROUGH THE WEEKEND. ONLY TRICKY PART OF THE FORECAST IS FOR THE COASTAL ZONES AS INLAND AREAS WILL BE EXPERIENCING RECORD HEAT WITH VERY LITTLE RELIEF UNTIL NEXT WEEK. ALONG THE COAST HOWEVER A SHALLOW BUT STRONG INVERSION HAS DEVELOPED AS THE OFFSHORE FLOW WAS NOT STRONG ENOUGH TO SQUASH IT COMPLETELY. AS A RESULT, THERE IS A VERY LARGE TEMPERATURE GRADIENT FROM THE COAST TO THE VALLEYS. NAM SHOWS THIS PATTERN CONTINUING FRIDAY, AND EVEN BRINGS IN MORE OF A MARINE INFLUENCE THAN TODAY. FOR THIS REASON I'M GOING TO KEEP TEMPERATURES OVER THE COASTAL ZONES SEVERAL DEGREES COOLER THAN MOS GUIDANCE. HOWEVER, IT SHOULD BE NOTED THAT EVEN A VERY SLIGHT DOWNWARD ADJUSTMENT TO THE INVERSION OR A SLIGHTLY STRONGER OFFSHORE FLOW COULD PUSH TEMPERATURES UP BY 10 DEGREES OR MORE SO THIS FORECAST IS TENUOUS AT BEST. AS MENTIONED, WITH INLAND AREAS WELL REMOVED FROM THE MARINE INFLUENCE HIGHS THERE WILL BE UNAFFECTED AND WILL APPROACH OR EVEN EXCEED TRIPLE DIGITS SO NOT MUCH DRAMA THERE. TRICKY COASTAL ZONE FORECAST CONTINUES THROUGH THE WEEKEND. MOS GUIDANCE COOLS TEMPERATURES SAT WHICH WOULD SEEM REASONABLE GIVEN THAT GRADIENTS ARE EXPECTED TO TREND ONSHORE. HOWEVER, HEIGHTS, THICKNESSES, AND 950 TEMPS ARE HIGHER AND THE MODELS SHOW DRIER AIR AT LOW LEVELS. SO I'VE TRENDED HIGHS WARMER ALL AREAS SAT, BUCKING THE MOS GUIDANCE TRENDS FOR THE COAST. BY SUNDAY, INCREASING ONSHORE FLOW SHOULD BRING COOLING AT LEAST TO COASTAL ZONES AND POSSIBLY INTO THE VALLEYS AS WELL. STILL LOOKING AT TRIPLE DIGIT HEAT IN THE WARMEST VALLEY LOCATIONS ON SUNDAY THOUGH. .LONG TERM (MON-THU)...HIGH PRESSURE RIDGE REMAINS PRETTY WELL LOCKED IN PLACE THROUGH MONDAY SO THE BULK OF THE COOLING WILL BE AT THE COAST. MORE SIGNIFICANT COOLING TUE AND WED AS THE RIDGE BREAKS DOWN ALLOWING MARINE AIR TO FILTER INLAND. HIGHS COULD START WARMING AGAIN THU IF GFS IS CORRECT, HOWEVER MODEL DIFFERENCES BETWEEN IT AND THE ECMWF LEAD TO A LOW CONFIDENCE FORECAST BEYOND WED. && .AVIATION...15/1915Z. GOOD CONFIDENCE IN CLEAR SKIES THROUGH FRI. LLWS WILL AFFECT KBUR AND KVNY THROUGH 05Z. KLAX...HIGH CONFIDENCE IN CLEAR SKIES THROUGH FRI. KBUR...HIGH CONFIDENCE IN CLEAR SKIES THROUGH FRI. LLWS WILL AFFECT THE SITE THROUGH 05Z. && .LOX WATCHES/WARNINGS/ADVISORIES... SPECIAL WEATHER STATEMENT (SEE LAXSPSLOX). && $$ PUBLIC...WOFFORD AVIATION...SWEET WWW.WEATHER.GOV/LOSANGELES
© 911Weather.com

Close this window after viewing.

911Weather.com

Weather data when you need it most

FXUS66 KLOX 152029
AFDLOX

SOUTHWEST CALIFORNIA AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LOS ANGELES/OXNARD CA
130 PM PDT THU MAY 15 2008

.SHORT TERM (TODAY-SUN)...STRONG HIGH PRESSURE ALOFT WILL DOMINATE 
THE WEATHER THROUGH THE WEEKEND. ONLY TRICKY PART OF THE FORECAST IS 
FOR THE COASTAL ZONES AS INLAND AREAS WILL BE EXPERIENCING RECORD 
HEAT WITH VERY LITTLE RELIEF UNTIL NEXT WEEK. ALONG THE COAST 
HOWEVER A SHALLOW BUT STRONG INVERSION HAS DEVELOPED AS THE OFFSHORE 
FLOW WAS NOT STRONG ENOUGH TO SQUASH IT COMPLETELY. AS A RESULT, 
THERE IS A VERY LARGE TEMPERATURE GRADIENT FROM THE COAST TO THE 
VALLEYS. NAM SHOWS THIS PATTERN CONTINUING FRIDAY, AND EVEN BRINGS 
IN MORE OF A MARINE INFLUENCE THAN TODAY. FOR THIS REASON I'M GOING 
TO KEEP TEMPERATURES OVER THE COASTAL ZONES SEVERAL DEGREES COOLER 
THAN MOS GUIDANCE. HOWEVER, IT SHOULD BE NOTED THAT EVEN A VERY 
SLIGHT DOWNWARD ADJUSTMENT TO THE INVERSION OR A SLIGHTLY STRONGER 
OFFSHORE FLOW COULD PUSH TEMPERATURES UP BY 10 DEGREES OR MORE SO 
THIS FORECAST IS TENUOUS AT BEST. AS MENTIONED, WITH INLAND AREAS 
WELL REMOVED FROM THE MARINE INFLUENCE HIGHS THERE WILL BE 
UNAFFECTED AND WILL APPROACH OR EVEN EXCEED TRIPLE DIGITS SO NOT 
MUCH DRAMA THERE.

TRICKY COASTAL ZONE FORECAST CONTINUES THROUGH THE WEEKEND. MOS 
GUIDANCE COOLS TEMPERATURES SAT WHICH WOULD SEEM REASONABLE GIVEN 
THAT GRADIENTS ARE EXPECTED TO TREND ONSHORE. HOWEVER, HEIGHTS, 
THICKNESSES, AND 950 TEMPS ARE HIGHER AND THE MODELS SHOW DRIER AIR 
AT LOW LEVELS. SO I'VE TRENDED HIGHS WARMER ALL AREAS SAT, BUCKING 
THE MOS GUIDANCE TRENDS FOR THE COAST.

BY SUNDAY, INCREASING ONSHORE FLOW SHOULD BRING COOLING AT LEAST TO 
COASTAL ZONES AND POSSIBLY INTO THE VALLEYS AS WELL. STILL LOOKING 
AT TRIPLE DIGIT HEAT IN THE WARMEST VALLEY LOCATIONS ON SUNDAY 
THOUGH.

.LONG TERM (MON-THU)...HIGH PRESSURE RIDGE REMAINS PRETTY WELL 
LOCKED IN PLACE THROUGH MONDAY SO THE BULK OF THE COOLING WILL BE AT 
THE COAST. MORE SIGNIFICANT COOLING TUE AND WED AS THE RIDGE BREAKS 
DOWN ALLOWING MARINE AIR TO FILTER INLAND. HIGHS COULD START WARMING 
AGAIN THU IF GFS IS CORRECT, HOWEVER MODEL DIFFERENCES BETWEEN IT 
AND THE ECMWF LEAD TO A LOW CONFIDENCE FORECAST BEYOND WED.

&&

.AVIATION...15/1915Z.
GOOD CONFIDENCE IN CLEAR SKIES THROUGH FRI. LLWS WILL AFFECT KBUR 
AND KVNY THROUGH 05Z. 

KLAX...HIGH CONFIDENCE IN CLEAR SKIES THROUGH FRI. 

KBUR...HIGH CONFIDENCE IN CLEAR SKIES THROUGH FRI. LLWS WILL AFFECT 
THE SITE THROUGH 05Z.

&&

.LOX WATCHES/WARNINGS/ADVISORIES...
SPECIAL WEATHER STATEMENT (SEE LAXSPSLOX).

&&

$$

PUBLIC...WOFFORD
AVIATION...SWEET

WWW.WEATHER.GOV/LOSANGELES