FXUS66 KHNX 292244
AFDHNX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN JOAQUIN VALLEY - HANFORD CA
244 PM PST SUN NOV 29 2009
.SYNOPSIS...
HIGH PRESSURE WILL BUILD INTO THE REGION AND REMAIN THROUGH MUCH OF
THE UPCOMING WEEK WITH DRY CONDITIONS EXPECTED. PATCHY FOG AND FROST
ARE LIKELY OVER THE VALLEY DURING THE LATE NIGHT AND EARLY MORNING
HOURS FOR THE NEXT COUPLE OF DAYS.
&&
.DISCUSSION...HIGH AMPLITUDE RIDGE IN THE EAST PAC WILL GRADUALLY
NOSE IN OVER CA TONITE. THIS WILL BRING CLEAR SKIES AND MAINLY
LIGHT WINDS. WHILE A FEW AREAS OF THE VALLEY HAVE ALREADY
EXPERIENCE FROST...MANY HAVE NOT...AND TONITE COULD BE THE FIRST
OF THE SEASON OUTSIDE OF LARGER URBAN AREAS. HAVE ISSUED A FROST
ADVISORY FOR THIS. THE POSSIBLE EXCEPTION WOULD BE THE FAR SOUTH
END OF THE VALLEY WHERE SOME LIGHT DOWNSLOPE WINDS COULD OCCUR AND
KEEP TEMPS ABOVE 32. OTHERWISE...THE HIGH BUILDING IN OVERHEAD
WILL BEGIN TO STRENGTHEN THE VALLEY INVERSION...AND FOG COULD
BECOME MORE OF A PROBLEM OVER TIME. BUT EXPECT TONIGHT IT WILL
REMAIN ON THE PATCHY SIDE.
THE UPPER RIDGE WILL PREVAIL MUCH OF THE WEEK...THOUGH IT WILL
UNDERGO MINOR UNDULATIONS WITH SOME FORM OF WEAKNESSES DEVELOPING
WITHIN THE RIDGE. TEMPS WILL WARM MOST AREAS AS THE RIDGE BUILDS.
THE POSSIBLE EXCEPTION BEING THE VALLEY...DEPENDING ON HOW STRONG
OF AN INVERSION EVENTUALLY SETS UP. BY THE WEEKEND...GFS AND THE
EURO HAVE SIGNIFICANT DIFFERENCES. GFS DEVELOPS A STRONG RIDGE IN
THE GLF AK AND SENDS A SHORTWAVE DIGGING SOUTH ACROSS WESTERN
CANADA WITH AN ARCTIC OUTBREAK INTO THE WESTERN STATES. THE EURO
ON THE OTHER HAND SHOWS A FAIRLY STRONG SOUTHERN STREAM SYSTEM
UNDERCUTTING THE GLF AK RIDGE AND A SURGE OF SUBTROP MOISTURE INTO
CA SOMETIME SUN. FOR NOW...DO NOT FAVOR EITHER MODEL AS
YET...THOUGH A GOOD MAJORITY OF GFS ENSEMBLE MEMBERS FAVOR A MORE
EURO-STYLE SOLUTION VS THE OPERATIONAL GFS.
&&
.AVIATION...
IN THE SAN JOAQUIN VALLEY...AREAS OF MVFR VISIBILITIES WITH LOCAL
IFR/LIFR IN MIST/FOG CAN BE EXPECTED BETWEEN 06Z AND 18Z MONDAY.
OTHERWISE...VFR CONDITIONS WILL PREVAIL ACROSS THE CENTRAL
CALIFORNIA INTERIOR THROUGH 00Z TUESDAY.
&&
.AIR QUALITY ISSUES...
NONE
&&
.HNX WATCHES/WARNINGS/ADVISORIES...
FROST ADVISORY FROM 11 PM THIS EVENING TO 8 AM PST MONDAY FOR
CAZ089>092.
&&
$$
PUBLIC...BINGHAM
AVN/FW...BEAN
WEATHER.GOV/HANFORD
