AREA FORECAST DISCUSSION

 
 FXUS65 KSLC 230340
 AFDSLC
 
 AREA FORECAST DISCUSSION
 NATIONAL WEATHER SERVICE SALT LAKE CITY UT
 840 PM MST SUN NOV 22 2009
 
 .SYNOPSIS...A STORM SYSTEM WILL CONTINUE TO IMPACT THE AREA THROUGH 
 TONIGHT. HIGH PRESSURE ALOFT WILL THEN SETTLE OVER UTAH MONDAY 
 NIGHT...AND REMAIN OVER THE REGION THROUGH THE BALANCE OF THE WEEK.
 
 &&
 
 .DISCUSSION...A STORM SYSTEM CONTINUES TO MOVE ACROSS THE REGION 
 THIS EVENING. THE CLOSED UPPER LOW ASSOCIATED WITH THIS SYSTEM IS 
 CURRENTLY NOTED NEAR THE IDAHO/MONTANA BORDER WITH THE UPPER JET 
 DIVING ACROSS CENTRAL UTAH. THE ASSOCIATED COLD FRONT HAS MOVED TO 
 NEAR A MILFORD-PRICE-ROCK SPRINGS LINE AND WILL CONTINUE TO SWEEP 
 ACROSS SOUTHEAST UTAH THROUGH AROUND MIDNIGHT.
 
 SNOWFALL DEVELOPED OVER NORTHERN UTAH/SOUTHWEST WYOMING THIS EVENING 
 AHEAD OF AND BEHIND THE FRONT...BUT THIS HAS ALREADY DECREASED IN 
 INTENSITY AS THE 700MB BAROCLINIC ZONE PUSHED SOUTH. DUE TO THE 
 POSITION OF THE JET...EXPECT PRECIPITATION TO REMAIN LIMITED TO 
 MAINLY THE NORTHERN HALF OF THE CWA. WITH PRECIPITATION WINDING DOWN 
 FOR THE MOST PART...EXPECT ONLY MINOR ADDITIONAL ACCUMULATIONS 
 THROUGH THE REMAINDER OF THE NIGHT BEFORE THE STORM SYSTEM MOVES 
 EAST OF THE AREA AND THE AIRMASS BECOMES MORE STABLE BY EARLY 
 TOMORROW MORNING. THE ONLY WILD CARD WILL BE THE LAKE. AT THIS 
 TIME...700MB TEMPERATURES OF -12C OVER LAKE TEMPERATURES OF +8C 
 SHOULD RESULT IN ENOUGH INSTABILITY FOR SOME LAKE-INDUCED SHOWERS TO 
 DEVELOP TONIGHT THROUGH AROUND 09Z...AND IT APPEARS THAT THESE 
 SHOWERS ARE ALREADY BEGINNING. LATEST BUFR SOUNDINGS INDICATE THESE 
 SHOWERS COULD IMPACT ANYWHERE FROM SOUTHERN DAVIS/NORTHEAST SALT 
 LAKE COUNTY TO THE CENTRAL SALT LAKE VALLEY...INCLUDING THE SALT 
 LAKE AIRPORT. WILL HAVE TO WATCH ITS DEVELOPMENT THIS EVENING TO SEE 
 IF ANY ADDITIONAL HEADLINES ARE NECESSARY. OTHERWISE...AM 
 CONSIDERING CANCELING THE ADVISORY FOR THE CACHE VALLEY LATER 
 TONIGHT...BUT KEEP THE MOUNTAIN ZONES GOING. AS FOR THE NORTHERN 
 WASATCH FRONT...WILL WAIT AND SEE IF THIS AREA WILL BE IMPACTED BY 
 THE LAKE-EFFECT.
 
 HIGH PRESSURE WILL BUILD INTO THE AREA BEHIND THE DEPARTING LOW 
 TOMORROW AND THEN REMAIN IN PLACE THROUGH MUCH OF THE WEEK.
 
 &&
 
 .AVIATION...WINDS AT THE SLC TERMINAL ARE EXPECTED TO REMAIN 
 NORTHERLY THROUGH AROUND 12Z...BEFORE BECOMING SOUTHEASTERLY BETWEEN 
 11Z AND 15Z. HOWEVER...THERE IS A 30 PERCENT CHANCE THAT WINDS COULD 
 SHIFT TO THE SOUTHEAST AS EARLY AS 9Z. MVFR CONDITIONS ARE EXPECTED 
 TO SLOWLY IMPROVE TO VFR BETWEEN 6Z AND 9Z...BUT COULD LAST AS LONG 
 AS 12Z DEPENDING ON LAKE EFFECT SNOW. CEILINGS BELOW 6000 FEET ARE 
 EXPECTED THROUGH AROUND 15Z.
 
 &&
 
 .SLC WATCHES/WARNINGS/ADVISORIES...
 UT...WINTER WEATHER ADVISORY UNTIL 4 AM MONDAY FOR UTZ007-UTZ009.
 
      WINTER WEATHER ADVISORY UNTIL 4 AM MONDAY FOR UTZ001-UTZ002.
 
 WY...NONE.
 
 &&
 
 $$
 
 PUBLIC...CHENG
 AVIATION...HOSENFELD
 
 FOR MORE INFORMATION FROM NOAA/S NATIONAL WEATHER SERVICE VISIT...
 HTTP://WEATHER.GOV/SALTLAKECITY (ALL LOWER CASE)