AREA FORECAST DISCUSSION

 
 FXUS66 KHNX 212304
 AFDHNX
 
 AREA FORECAST DISCUSSION
 NATIONAL WEATHER SERVICE SAN JOAQUIN VALLEY - HANFORD CA
 304 PM PST SAT NOV 21 2009
 
 .SYNOPSIS...
 MOSTLY CLEAR THROUGHOUT THE AREA TONIGHT WITH THE EXCEPTION OF
 LOW CLOUDS DUE TO UPSLOPE WINDS OVER THE FOOTHILLS NEAR THE SIERRA
 NEVADA AND MOUNTAIN AREAS OF KERN COUNTY. HIGH PRESSURE WILL
 RETURN WITH DRY CONDITIONS AND GRADUALLY WARMING TEMPERATURES
 SUNDAY THROUGH THE HOLIDAY WEEKEND.
 
 &&
 
 .DISCUSSION...
 IMPRESSIVE SYSTEM MOVING INTO PAC NW TONIGHT AND WILL HAVE NO
 IMPACT ON THE AREAS WEATHER. CLOUDS HAVE REMAINED BANKED ALONG
 THE EAST SIDE OF THE VALLEY ALONG THE SIERRA FOOTHILLS ALL DAY
 WITH LOW CLOUDS...FOG...AND DRIZZLE. THE REST OF THE FORECAST AREA
 HAS CLEARED OUT QUITE NICELY.
 
 MODELS ARE PRODUCING SOME PATCHY FOG IN SOME THE FOG PRONE AREAS
 ALONG THE 198 CORRIDOR...THIS IS ALSO WHERE THE COLDEST TEMPS ARE
 EXPECTED AS WELL...WITH SOME PATCHY FROST IN SHELTERED AREAS.
 
 ZONAL FLOW ON SUNDAY WILL GIVE WAY TO A GRADUAL RIDGE BUILDING IN
 OVER THE AREA THROUGH THANKSGIVING...WITH WARMING TEMPS AND
 CLEARS SKIES EXPECTED. ANOTHER SHORT WAVE TROUGH WITH LITTLE OR NO
 MOISTURE WILL APPROACH THE REGION BY FRIDAY WITH AN INCREASE IN
 CLOUDS ACROSS THE NRN PORTION OF THE SJV.
 
 CONFIDENCE IS GOOD THROUGH FRIDAY AS THE EXTENDED MODELS ARE IN
 DECENT AGREEMENT WITH THE LONGWAVE PATTERN.
 
 &&
 
 .AVIATION...
 LOW CLOUDS ARE CONTINUING TO MAKE AN IMPACT ACROSS THE SOUTHERN 
 SIERRA AND THE TEHACHAPI MOUNTAINS. CLOUDS HAVE BEEN SCATTERING OUT 
 IN THE FRESNO COUNTY PORTION AND FURTHER NORTH FOR THE SIERRA BUT 
 HAVE BEEN PERSISTENT IN THE TULARE COUNTY PORTION. FURTHER SOUTH THE 
 LOW CLOUDS ARE HAVING A TOUGH TIME DECREASING. WE RECEIVED A REPORT 
 OF A MOTORIST IN SEQUOIA NAT PARK WHO EXPERIENCED NEAR ZERO VSBY IN 
 FOG AT ABOUT 3KFT. THE LOW CLOUDS WILL PROBABLY NOT ERODE MUCH 
 OVERNIGHT IN THE KERN MOUNTAINS WITH ANOTHER SHOT OF COOL AIR 
 EXPECTED TO MOVE SOUTH INTO THE VALLEY. GUSTY WINDS ACROSS THE SAN 
 JOAQUIN VALLEY WILL DIMINISH THIS EVENING. AREAS OF FOG ARE EXPECTED 
 TO FORM LATER TONIGHT ACROSS PORTIONS OF THE VALLEY. HAVE BROUGHT 
 LIFR CONDITIONS TO KVIS AND IFR CONDS FOR VSBY TO OTHER TERMINAL 
 SITES LATE TONIGHT AND EARLY SUNDAY. LOW CLOUDS AND FOG WILL 
 CONTINUE OVERNIGHT ACROSS THE FAR SOUTHERN VALLEY AND TEHACHAPI 
 MOUNTAINS WITH LIFR CONDITIONS THERE AT TIMES THROUGH 12Z SUNDAY. 
 
 &&
 
 .AIR QUALITY ISSUES...
 NONE
 
 &&
 
 .HNX WATCHES/WARNINGS/ADVISORIES...
 NONE.
 
 &&
 
 

 
 PUBLIC...JDB
 AVN/FW...BROTHERTON
 
 WEATHER.GOV/HANFORD