• Big Canyon Reservoir, California, United States
  • WxZone: CAZ042ICAO: KSNALat: 33.61NLon: 117.86W

Discussions

200 PM PDT SUN AUG 29 2010

.SYNOPSIS...
AN UPPER LEVEL TROUGH OF LOW PRESSURE NEAR THE WEST COAST WILL 
MAINTAIN WELL BELOW SEASONAL TEMPERATURES AND A DEEP MARINE LAYER 
INTO MONDAY WITH GUSTY ONSHORE WINDS IN THE MOUNTAINS AND DESERTS.
GRADUAL WARMING THE MIDDLE TO LATTER PART OF THE WEEK AS HIGH 
PRESSURE BUILDS ALOFT. COOLING NEXT WEEKEND AS A TROUGH PASSES BY TO 
THE NORTH.

&&

.DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE...
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...

.SHORT TERM (TODAY THROUGH WEDNESDAY)...
ASIDE FROM A FEW TINY PATCHES OF STRATUS INLAND...SKIES WERE MOSTLY 
CLEAR THIS AFTERNOON. AFTERNOON AIRCRAFT SOUNDINGS FROM KSAN SHOW AN 
INVERSION BASED AT 2200 FT WITH SOUTH WINDS NEAR THE SURFACE AND 
WEST WINDS ALOFT. THE COASTAL EDDY HAS WEAKENED A BIT AND ONSHORE 
GRADIENTS ARE 7.5 MB SAN-IPL.

A TROUGH OF LOW PRESSURE ALONG THE WEST COAST WILL MAINTAIN WELL 
BELOW SEASONAL TEMPERATURES THROUGH MONDAY WITH SLOW WARMING FOR 
TUESDAY AND WEDNESDAY. GUSTY ONSHORE WINDS WILL CONTINUE IN THE 
MOUNTAINS AND DESERTS AT TIMES THROUGH TONIGHT. THE MARINE LAYER AND 
ONSHORE FLOW WILL CONTINUE AREAS OF NIGHT AND MORNING LOW CLOUDS AND 
FOG EXTENDING INTO THE INLAND VALLEYS THROUGH MONDAY. COOLING ALOFT 
ASSOCIATED WITH THE TROUGH WILL CONTINUE TO WEAKEN THE MARINE 
INVERSION...SO EXPECT STRATUS TO BE PATCHY WITH CLEARING A LITTLE 
EARLIER ON MONDAY. THE MARINE LAYER DEPTH WILL DECREASE TUESDAY 
NIGHT AND WEDNESDAY NIGHT SO STRATUS WILL GENERALLY BE CONFINED TO 
THE COASTAL AREAS.

&&

.LONG TERM (THURSDAY THROUGH SUNDAY)...
HIGH PRESSURE TO THE EAST WILL EXPAND WESTWARD TOWARD CALIFORNIA FOR 
THE MIDDLE INTO THE LATTER PART OF THE WEEK BRINGING SLOW WARMING 
AND A DECREASE IN THE MARINE LAYER DEPTH. ANOTHER TROUGH OF LOW 
PRESSURE MAY DEVELOP ALONG THE WEST COAST NEXT WEEKEND FOR SLOW 
COOLING.

&&

.AVIATION...
292030Z...THE MARINE LAYER WILL CONTINUE ABOUT 3000 FEET DEEP AS A 
LOW PRESSURE TROUGH MOVES THROUGH CALIFORNIA. LOW CLOUDS WILL RETURN 
THIS EVENING WITH CEILINGS AROUND 2500 FEET DEVELOPING OVER COASTAL 
AIRPORTS BETWEEN 02-05Z. AS THE TROUGH WEAKENS MONDAY THE MORNING 
CLEARING AT COASTAL AIRPORTS WILL BE EARLIER...AROUND 16Z.

&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...NONE.
PZ...NONE.

&&

$$

PUBLIC...SS
AVIATION/MARINE...MM

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