988  
FXUS65 KREV 231112  
AFDREV  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE RENO NV  
312 AM PST MON JAN 23 2017  
   
SYNOPSIS
 
 
SNOW SHOWERS WILL DIMINISH THROUGH THE MORNING AS OUR WINTER STORM  
DEPARTS THE REGION. LIGHT SNOW SHOWERS WITH LITTLE ADDITIONAL  
ACCUMULATION MAY LINGER INTO TUESDAY MORNING BUT OVERALL DRY AND  
COLD WEATHER IS EXPECTED FOR THE MIDDLE TO END OF THE WEEK. STRONG  
VALLEY INVERSIONS WILL DEVELOP NEXT WEEKEND.  
 

 
   
SHORT TERM
 
 
ONE LAST MAIN SNOW BAND IS WORKING ITS WAY ACROSS THE WESTERN SIERRA  
FOOTHILLS AND WILL PROVIDE THE TAHOE BASIN WITH SOME ADDITIONAL  
LIGHT TO MODERATE SNOWFALL THROUGH ABOUT 4-5AM BEFORE MOST ACTIVITY  
TAPERS OFF. ALL WINTER STORM AND WINTER WEATHER ADVISORIES WILL BE  
ALLOWED TO EXPIRE EARLY THIS MORNING WITH THE EXCEPTION OF MONO  
COUNTY WHICH WILL LIKELY SEE MODERATE TO HEAVY SNOW SHOWERS  
CONTINUING UNTIL ABOUT 7-9AM. THROUGH THE REMAINDER OF THE AFTERNOON  
AND INTO TUESDAY A FEW LINGERING LIGHT SNOW SHOWERS WILL BE POSSIBLE  
ACROSS THE SIERRA BUT LITTLE IN THE WAY OF ADDITIONAL ACCUMULATIONS  
IS EXPECTED.  
 
SOME CLEARING WILL BEGIN BY TUESDAY AFTERNOON INTO WEDNESDAY MORNING  
WHICH WILL PRODUCE CHILLY MORNING TEMPERATURES ALONG WITH CHANCES  
FOR FREEZING FOG FOR SIERRA VALLEYS. SINGLE DIGIT AND SUB-ZERO LOW  
TEMPERATURES CAN BE EXPECTED FOR SIERRA VALLEYS BY WEDNESDAY MORNING  
WITH SINGLE DIGITS AND TEENS EXPECTED ACROSS WESTERN NEVADA. HIGH  
TEMPERATURES WILL REMAIN IN THE LOWER TO MID 30S FOR MUCH OF THE  
SIERRA AND WESTERN NEVADA THROUGH MIDWEEK. FUENTES  
   
LONG TERM...WEDNESDAY NIGHT THROUGH SUNDAY
 
 
FORECAST MODELS HAVE BEEN RATHER CONSISTENT THE PAST COUPLE DAYS IN  
HAVING A WEAK SYSTEM UNDERCUT A RIDGE OVER THE PACNW/BRITISH  
COLUMBIA WEDNESDAY NIGHT INTO THURSDAY. SIMULATIONS HAVE BEEN  
GENERATING MORE QPF WITH EACH RUN AS THIS WAVE DIVES OFFSHORE,  
GATHERING PACIFIC MOISTURE, BEFORE MOVING INLAND AND BEING ABSORBED  
INTO A LARGE TROUGH OVER MUCH OF THE CONUS. HAVE INTRODUCED CHANCES  
FOR PRECIPITATION WEDNESDAY NIGHT AND KEPT CHANCES IN THROUGH  
THURSDAY. BEING THAT THERE IS LITTLE IN THE WAY OF FORCING, DOUBT  
THERE WILL BE MUCH OVERALL ACCUMULATION, BUT BE PREPARED FOR  
NUISANCE SNOW SHOWERS FOR THE WEDNESDAY EVENING AND THURSDAY MORNING  
COMMUTES.  
 
RIDGE BUILDS INTO THE WEST FOR THE WEEKEND WITH A 1044 MB SURFACE  
HIGH BUILDING ACROSS THE GREAT BASIN, RESULTING IN EASTERLY FLOW AND  
STRENGTHENING THE INVERSIONS. EXPECT POOR MIXING AND PARTICULATE  
BUILD-UP IN THE LOWER VALLEYS WITH POSSIBLE REDUCTIONS TO AIR  
QUALITY. THE BIG QUESTION WILL BE IF AREAS OF FREEZING FOG AND/OR  
LOW STRATUS WILL DEVELOP WITH THE INVERSIONS IN PLACE, BUT WE MAY  
NOT KNOW FOR SURE UNTIL WE SEE HOW THE REST OF THE WEEK PLAYS OUT.  
 
THE GOOD NEWS FOR THOSE TRYING TO DIG OUT OF THE INCREDIBLE AMOUNT  
OF SNOW THAT HAD FALLEN THIS MONTH IN THE SIERRA IS THAT THE LONG  
RANGE FORECAST KEEPS THE AREA FAIRLY DRY THROUGH THE START OF  
FEBRUARY. THERE ARE SOME INDICATIONS THAT MOISTURE WILL RETURN TO  
THE WEST BY THE END OF THE FIRST WEEK OF FEBRUARY, BUT AS ALWAYS  
THERE IS LOW CONFIDENCE THAT FAR OUT. -DAWN  
 

 
   
AVIATION
 
 
LINGERING SNOW SHOWERS WILL CONTINUE IN THE NORTHERN SIERRA THROUGH  
ABOUT 8 AM WITH A COUPLE OF ADDITIONAL INCHES OF ACCUMULATION  
POSSIBLE AT KTRK AND KTVL. FOR THE SOUTHERN SIERRA, INCLUDING KMMH,  
MODERATE TO HEAVY SNOW WILL CONTINUE UNTIL AROUND 9 AM, TAPERING TO  
SHOWERS THROUGH MIDDAY. AN ADDITIONAL 3 TO 6 INCHES OF ACCUMULATION  
IS POSSIBLE. A SECONDARY WEAK WAVE IS LIKELY TO GENERATE LIGHT SNOW  
SHOWER ACTIVITY AGAIN IN THE SIERRA LATE THIS AFTERNOON INTO  
TONIGHT.  
 
FOR WESTERN NEVADA, THE MAIN EVENT IS OVER, BUT A FEW STRAY SNOW  
SHOWERS ARE POSSIBLE WHICH COULD PUT A LIGHT GLAZE ON RUNWAYS THIS  
MORNING. THE GREATEST CONCERN TODAY WILL BE CONTINUED MOUNTAIN  
OBSCURATION AND SCATTERED TO BROKEN LOW CEILINGS. THERE IS A 20  
PERCENT CHANCE FOR ADDITIONAL SNOW SHOWERS LATE THIS AFTERNOON INTO  
TONIGHT, BUT ANY ACCUMULATION WOULD BE MINIMAL.  
 
THE SYSTEM CLEARS OUT OF THE AREA TUESDAY WITH PATCHY FREEZING FOG  
LIKELY TO DEVELOP TUESDAY NIGHT INTO WEDNESDAY MORNING IN MANY  
SIERRA VALLEYS, INCLUDING AT KTRK AND KTVL. -DAWN  
 

 
   
REV WATCHES/WARNINGS/ADVISORIES
 
 
NV...WINTER WEATHER ADVISORY UNTIL 4 AM PST EARLY THIS MORNING NVZ005.  
 
WINTER STORM WARNING UNTIL 4 AM PST EARLY THIS MORNING NVZ002.  
 
WINTER WEATHER ADVISORY UNTIL 4 AM PST EARLY THIS MORNING  
NVZ001-004.  
 
WINTER WEATHER ADVISORY UNTIL 4 AM PST EARLY THIS MORNING NVZ003.  
 
CA...WINTER WEATHER ADVISORY UNTIL 4 AM PST EARLY THIS MORNING CAZ071.  
 
WINTER WEATHER ADVISORY UNTIL 4 AM PST EARLY THIS MORNING CAZ070.  
 
WINTER STORM WARNING UNTIL 10 AM PST THIS MORNING CAZ073.  
 
WINTER STORM WARNING UNTIL 4 AM PST EARLY THIS MORNING CAZ072.  
 

 
 

 
 
FOR MORE INFORMATION FROM THE NATIONAL WEATHER SERVICE VISIT...  
HTTP://WEATHER.GOV/RENO  
 
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