FXUS65 KREV 080033
AFDREV

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE RENO NV
ISSUED BY NATIONAL WEATHER SERVICE SACRAMENTO CA
435 PM PST MON DEC 7 2009

.DISCUSSION...WATER VAPOR IMAGERY CONTINUES TO SHOW A VERY COLD 
TROUGH OF LOW PRESSURE DIGGING OVER CALIFORNIA AND NEVADA THIS 
AFTERNOON.  THIS SYSTEM HAS PRODUCED UP TO 3 FEET OF SNOW OVER THE 
SIERRA CREST DURING THE PAST 24 HOURS...AND WIDESPREAD MODERATE SNOW 
EAST OF THE SIERRA CREST FOR MOST OF THE DAY.  HOWEVER...THE MAIN 
DEFORMATION BAND IS FINALLY BEGINNING TO SHIFT SOUTH AND EAST OF 
RENO THIS AFTERNOON...WITH ONLY ISOLATED TO SCATTERED SHOWERS BEHIND 
THE BAND.  THEREFORE...HAVE CANCELLED MOST OF THE WINTER STORM 
WARNINGS WITH THE AFTERNOON PACKAGE.  HOWEVER...THE MAIN 
PRECIPITATION BAND CONTINUES TO LINGER OVER MONO...MINERAL...AND 
SOUTHERN LYON COUNTIES...AND WILL KEEP THE WINTER STORM WARNING 
GOING FOR THESE AREAS THROUGH ABOUT 7 PM THIS EVENING.  THE OTHER 
MAIN CONCERN FOR TONIGHT WILL BE WITH THE VERY COLD OVERNIGHT 
TEMPERATURES.  AT THIS POINT IN TIME...BELIEVE SKIES WILL CLEAR LATE 
TONIGHT...AS DRIER AIR MOVES INTO THE REGION...WHICH WILL ALLOW FOR 
VERY EFFECTIVE RADIATIONAL COOLING WITH THE SNOW ON THE GROUND.  
EVEN THE RENO AREA WILL SEE TEMPERATURES NEAR ZERO TONIGHT.

DRIER CONDITIONS WILL DEVELOP OVER THE REGION TUESDAY AND 
WEDNESDAY...WITH COLD OVERNIGHT TEMPERATURES CONTINUING TO BE AN 
ISSUE.  HOWEVER...THE OVERALL WEATHER PATTERN WILL MOST LIKELY 
TRANSITION TO A WETTER PATTERN LATE IN THE WEEK AND THIS 
WEEKEND...AS A SERIES OF SYSTEMS MOVE INTO THE WEST COAST.  AT THIS 
POINT IN TIME...THE FIRST OF WHICH WILL MOST LIKELY MOVE INTO THE 
REGION LATE WEDNESDAY NIGHT AND THURSDAY...BRINGING MORE SNOW TO THE 
WARNING AREA.  MODELS ARE CONTINUING TO HAVE SOME ISSUES WITH THESE 
SYSTEM...WITH TEMPERATURES...STRENGTH...AND MOISTURE CONTENT.  THE 
STRONGEST OF WHICH...STILL LOOKS LIKE IT WILL MOVE INTO THE AREA ON 
SATURDAY.  SNOW LEVELS WILL ALSO BE ON THE RISE THIS WEEKEND...BUT 
MAY STILL BE LOW ENOUGH FOR A RAIN SNOW MIX.  THEREFORE...WILL KEEP 
A CHANCE OF RAIN AND SNOW GOING THROUGH THE WEEKEND AND EARLY NEXT 
WEEK.  PALMER

&&

.AVIATION...A COLD UPPER LEVEL TROUGH AXIS WAS ORIENTED FROM THE SW 
TO NE ACROSS THE CENTER OF NEVADA AT 00Z TUE.  THE TROUGH WILL 
CONTINUE GRADUALLY TRANSLATING EASTWARD THROUGH THE NEXT 12 HRS WITH 
DRY NW FLOW ALOFT DEVELOPING IN ITS WAKE. LIFR/IFR CIGS AND VSBYS 
ARE MAINLY TO THE EAST OF THE AXIS WITH CONDITIONS IMPROVING TO THE 
WEST. 

FOR KRNO...CIGS GENLY VFR WITH RISK MVFR/IFR IN CIGS AND VSBY IN 
SNOW SHOWERS THROUGH ABOUT 04Z...WITH GENLY VFR AFT 04Z. 

KLOL...GENLY VFR THROUGH 18Z. SLIGHT RISK OF ISOLD LIFR/IFR CIG AND 
VSBY DUE TO SHSN THROUGH ABOUT 03Z. DK2

&&

.REV WATCHES/WARNINGS/ADVISORIES...
NV...WINTER STORM WARNING UNTIL 7 PM PST THIS EVENING FOR NVZ001.

CA...WINTER STORM WARNING UNTIL 7 PM PST THIS EVENING FOR CAZ073.

&&

$$

HTTP://WEATHER.GOV/RENO