AREA FORECAST DISCUSSION

 
 FXUS65 KSLC 250423
 AFDSLC
 
 AREA FORECAST DISCUSSION
 NATIONAL WEATHER SERVICE SALT LAKE CITY UT
 923 PM MST TUE NOV 24 2009
 
 .SYNOPSIS...HIGH PRESSURE ALOFT WILL STRENGTHEN AND REMAIN ACROSS
 THE REGION THROUGH THE LATTER HALF OF THE WEEK. A PACIFIC STORM
 SYSTEM IS EXPECTED TO MOVE INTO THE GREAT BASIN LATE FRIDAY AND
 SATURDAY.
 
 
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 .DISCUSSION...HIGH PRESSURE CONTINUES TO BUILD OVER THE FORECAST
 AREA THIS EVENING...RESULTING IN MOSTLY CLEAR SKIES AND GENERALLY
 LIGHT WINDS. THE ONLY EXCEPTION TO THIS IS OVER SOUTHWEST
 UTAH...WHERE A STRONGER PRESSURE GRADIENT IS PRODUCING
 OCCASIONALLY GUSTY NORTHERLY WINDS THAT WILL WEAKEN OVERNIGHT
 ALONG WITH THE GRADIENT. 
 
 AS THE RIDGE CONTINUES TO BUILD THROUGH MUCH OF THE WEEK...THE
 AIRMASS WILL WARM...RESULTING IN A STEADY INCREASE IN TEMPERATURES
 IN THE HIGHER ELEVATIONS. HOWEVER...STRENGTHENING VALLEY
 INVERSIONS WILL RESULT IN LITTLE CHANGE IN MAXES THROUGH AT LEAST
 THURSDAY...SO TEMPERATURES WILL REMAIN AT LEAST 5F BELOW SEASONAL
 NORMS. 
 
 MODELS AGREE THAT THE RIDGE WILL SHIFT EAST FRIDAY AHEAD OF AN
 APPROACHING STORM SYSTEM...RESULTING IN INCREASING SOUTHWEST FLOW.
 ALL MODELS SHOW THE FLOW INCREASING TO 20-30 KTS AT 700 MB...WHICH
 WOULD AT LEAST ALLOW THE BENCHES TO MIX OUT. IT SHOULD BE NOTED
 THAT EARLIER MODEL RUNS INDICATED MORE OF AN INCREASE IN THE
 FLOW...WHICH MADE IT MORE LIKELY THAT THE ENTIRE VALLEY WOULD MIX
 OUT. 
 
 THE WEEKEND STORM SYSTEM IS PROGGED TO ARRIVE IN TWO PIECES...ONE
 LATE FRIDAY/EARLY SATURDAY AND THE SECOND LATE SATURDAY AND EARLY
 SUNDAY. LATEST MODELS ARE SHOWING AN INCREASINGLY DISORGANIZED
 SYSTEM...PARTICULARLY WITH THE FIRST PIECE...THAN THE RUNS
 YESTERDAY. CURRENT GUIDANCE INDICATES ANY PRECIP THAT FALLS WILL
 LIKELY BE LIGHT IN NATURE. ALL MODELS AGREE THAT HIGH PRESSURE
 WILL BUILD BACK OVER THE REGION BEGINNING MONDAY.
 
 NO UPDATES EXPECTED TO THE FORECAST THIS EVENING. 
 
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 .AVIATION...VFR CONDITIONS WILL CONTINUE AT THE SLC TERMINAL THROUGH 
 THE NIGHT. LIGHT AND VARIABLE WINDS OR SOUTHEAST DRAINAGE UNTIL 
 NORTHWEST LAKE BREEZE RESUMES BETWEEN 18Z AND 19Z. 
 
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 .SLC WATCHES/WARNINGS/ADVISORIES...
 UT...NONE.
 WY...NONE.
 
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 $$
 
 PUBLIC...TRAPHAGAN
 AVIATION...YOUNG
 
 FOR MORE INFORMATION FROM NOAA/S NATIONAL WEATHER SERVICE VISIT...
 HTTP://WEATHER.GOV/SALTLAKECITY (ALL LOWER CASE)