Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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000
FXUS65 KSLC 111550
AFDSLC

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
950 AM MDT THU SEP 11 2014

.SYNOPSIS...AN UNSEASONABLY COOL AIRMASS PUSHING SOUTH ON THE EAST
SIDE OF THE CONTINENTAL DIVIDE WILL PUSH SOME COLD AIR AND
EASTERLY FLOW INTO NORTHERN UTAH TONIGHT. OTHERWISE A WARMER AND
DRY AIRMASS WILL DEVELOP OVER THE GREAT BASIN OVER THE WEEKEND.

&&

.DISCUSSION...VERY COLD AIRMASS FOR SEPTEMBER IS PUSHING SOUTH
THROUGH MT/WY. SURFACE PRESSURE GRADIENT HAS ALREADY REVERSED WITH
THE SURFACE TROUGH ON A LINE FROM GRAND JUNCTION TO CEDAR CITY
THIS MORNING. HOWEVER ACTUAL ARCTIC FRONT APPEARS TO BE NO FURTHER
WEST THAN ROCK SPRINGS.

VARIOUS MODELS...INCLUDING THE HRRR INDICATE THE ARCTIC SURFACE
BOUNDARY WILL NOT MAKE MUCH PROGRESS THIS AFTERNOON AS LEADING
EDGE OF THE COLD AIR IS VERY SHALLOW AND FLOW ALOFT IS FROM THE
WEST NORTHWEST. SO WESTERLY WINDS AND TEMPS IN THE 50S AND LOW 60S
LIKELY TO PERSIST ALL DAY IN UINTAH COUNTY WYOMING.

THIS EVENING SOME OF THE COLD AIR BEGINS SPILLING INTO UTAH FROM
THE NORTH AND THE EAST. EXPECT GUSTY EASTERLY WINDS NEAR THE
CANYON MOUTHS OF THE WASATCH FRONT AND CACHE VALLEY LATE TONIGHT
AND FRIDAY MORNING WITH GUSTS IN THE 20 TO 40 MPH RANGE IN THE
MOST FAVORED AREAS. WITHOUT ANY SUPPORT FROM FLOW ALOFT DO NOT
EXPECT WIDESPREAD DOWNSLOPE EVENT.

OTHER SIGNIFICANT CONCERN IS POTENTIAL FOR FROST IN THE CACHE
VALLEY AND WASATCH BACK. WILL LOOK CLOSELY AT 12Z GUIDANCE BUT AT
THIS TIME IT APPEARS MIN TEMPS WILL NOT JUSTIFY A HARD FREEZE
WARNING...28F...JUST SOME MINS NEAR 32F.

WILL LOOK AT GENERATING SOME GRAPHICAL CONTENT FOR CANYON WINDS
AND FROST THIS AFTERNOON.

BEYOND THE NEXT 24 HOURS THINGS LOOK DRY WITH A WARMING TREND OVER
THE ENTIRE FORECAST AREA OVER THE WEEKEND AND INTO NEXT WEEK.

NO CHANGES TO CURRENT FORECAST AT THIS TIME.

&&

.AVIATION...THE SLC TERMINAL WILL SEE VFR CONDITIONS UNDER CLEAR
SKIES THROUGHOUT THE DAY. WINDS WILL BECOME NORTHWEST BY 17Z AND
COULD BECOME GUSTY AT TIMES BETWEEN 19Z AND 23Z.

&&

.SLC WATCHES/WARNINGS/ADVISORIES...
UT...NONE.
WY...NONE.
&&

$$

PUBLIC...DUNN
AVIATION...WILENSKY

FOR MORE INFORMATION FROM NOAA/S NATIONAL WEATHER SERVICE VISIT...
HTTP://WEATHER.GOV/SALTLAKECITY (ALL LOWER CASE)

FOR FREQUENTLY ASKED QUESTIONS ABOUT THE AREA FORECAST DISCUSSION
VISIT...
HTTP://WEATHER.GOV/SALTLAKECITY/GENERAL/AFD_FAQS.PHP (ALL LOWER CASE)


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