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000
FXUS65 KREV 101040
AFDREV

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE RENO NV
240 AM PST WED FEB 10 2010

.SHORT TERM...

RIDGE OF HIGH PRESSURE CONTINUES TO BUILD INTO THE GREAT BASIN THIS
MORNING AS THE LOW PRESSURE THAT AFFECTED THE AREA YESTERDAY PULLS
SOUTH AND EAST INTO NORTHERN MEXICO. LOW LEVEL CLOUDS ARE BREAKING
UP FAST THIS MORNING DUE TO INCREASING SUBSIDENCE AND DRY AIR ALOFT.
YOU CAN ALREADY MAKE OUT TAHOE AND PYRAMID EASILY ON SATELLITE THIS
MORNING. SHOULD SEE SOME LINGERING CLOUDS SOUTH OF HIGHWAY 50 LATE
THIS MORNING...MOSTLY SUNNY ELSEWHERE. A PAIR OF SHORTWAVES ARE
EXPECTED TO BRUSH US BY TO THE NORTH THU-FRI.

THE NEXT SHORTWAVE TROUGH APPROACHES THE CA/OR COAST ON THU. THE
BEST DYNAMICS AND MOISTURE WILL REMAIN WELL TO THE NORTH OVER THE
PAC NW. SOME WEAK WARM AIR ADVECTION PRECIP WILL MOVE INTO THE
NORTHERN SIERRA AND SOUTHERN CASCADES ON THU...BUT WON`T HAVE MUCH
EFFECT ON THE REST OF THE AREA EXCEPT FOR SOME INCREASED CLOUDS DUE
TO SHADOWING. CONTINUED TRENDING THE FORECAST DRIER FOR THE
THURSDAY-THURSDAY NIGHT TIMEFRAME...EXCEPT FOR HIGHER ELEVATIONS OF
FAR WESTERN LASSEN-PLUMAS COUNTIES THAT WILL LIKELY SEE WARM AIR
ADVECTION RAIN/SNOW THU-THU NIGHT.

CHANCES FOR PRECIP WILL INCREASE FRIDAY AS SOME INCREASED MOISTURE
GETS PUSHED UP INTO THE NORTHERN SIERRA. YET AGAIN...NOT A VERY
IMPRESSIVE SYSTEM...WITH LITTLE MOISTURE. RAIN/SNOW WILL LIKELY
AFFECT THE SIERRA FROM TAHOE NORTHWARD...BUT SHADOW OUT THE LEE-SIDE
VALLEYS. SOUTHWEST WINDS ARE EXPECTED TO INCREASE THU-FRI AS THE
SHORTWAVES PASSING TO THE NORTH HELP TO TIGHTEN UP THE SURFACE
GRADIENTS.  HOON

.LONG TERM...SATURDAY THROUGH TUESDAY...

MEDIUM RANGE SOLNS THIS MRNG ARE IN FAIR AGREEMENT WITH LARGE SCALE
FEATURES AND SUPPORT FLAT RDG/NR NORMAL HGT ANOMALIES ACRS WRN NORTH
AMERICA DURING THIS PD. DESPITE CONFIDENCE IN THE FINER SCALE
DETAILS BEING MUCH LOWER...THE LARGER SCALE FLOW WL TAKE MOST OF THE
S/W ENERGY INTO THE PACNW AND IT WL ONLY BRUSH NRN CA/NWRN NV.
TIMING OF LGT PCPN POTENTIAL ACRS NRN ZNS...GENERALLY NORTH OF A
SUSANVILLE TO GERLACH LINE...WL BE THE MAIN CHALLENGE AND EVEN THAT
WL BE MITIGATED BY HIGHER SNOW LVLS AND LTL IMPACT ON TRAVEL. SLGT
CHC OF PCPN WAS LEFT IN THE NRN AREAS SUN NGT AND AGAIN AT END OF PD
IN LINE WITH THE 00Z GFS/ECMWF AND IN AN ATTEMPT TO TIME A COUPLE OF
THESE S/W FEATURES. TEMPS WL RETURN TO NR OR SLGTLY ABV NORMAL WITH
OCNL HIER CLOUDS...ESPECIALLY AREAS NORTH OF I-80. HOHMANN
&&

.AVIATION...

CLEARING HAS ALLOWED FOR AREAS OF FZFG ARND KTRK THIS MRNG. THE FOG
HAS BEEN SHALLOW AND INTERMITTENT BUT SHOULD CONT THRU ABOUT 17Z.
OTHERWISE VFR WITH LGT WINDS TDY. HOHMANN
&&


.REV WATCHES/WARNINGS/ADVISORIES...
NV...NONE.
CA...NONE.
&&

$$

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