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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.
&&
.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.
&&
.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.
&&
.SLC WATCHES/WARNINGS/ADVISORIES...
UT...NONE.
WY...NONE.
&&
$$
PUBLIC...TRAPHAGAN
AVIATION...YOUNG
FOR MORE INFORMATION FROM NOAA/S NATIONAL WEATHER SERVICE VISIT...
HTTP://WEATHER.GOV/SALTLAKECITY (ALL LOWER CASE)
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