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259
FXUS65 KSLC 211602
AFDSLC

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
1002 AM MDT TUE OCT 21 2014

.SYNOPSIS...A PACIFIC COLD FRONT WILL CROSS UTAH TODAY WITH WEAK
HIGH PRESSURE BUILDING IN ON WEDNESDAY. DRY AND MILD SOUTHWEST
FLOW WILL RETURN FOR THURSDAY THROUGH SATURDAY.

&&

.DISCUSSION...A FAIRLY SHARP UPPER TROF IS LIFTING FROM NRN NV
INTO ID THIS MORNING. SLY FLOW OVER OUR CWA IS SUFFICIENTLY MOIST
TO SUPPORT A BAND OF SHOWERS AND ISOLATED TSTMS UNDER THE BEST
UPPER LEVEL LIFT. THE ASSOCIATED COLD FRONT IS MOVING INTO NWRN UT
AND SHOULD REACH SLC BY 17Z.

THE UPPER SUPPORT OUTRAN THE SURFACE COLD FRONT PREVENTING THE
SHOWERS FROM ORGANIZING INTO A MORE ROBUST BAND ALONG THE WASATCH
FRONT. BANDS OF SCATTERED SHOWERS DID CROSS THE WASATCH FRONT
EARLIER THIS MORNING AND EXPECT ONE LAST BAND RIGHT WITH THE COLD
FRONT BUT COVERAGE WILL NOT BE ALL THAT LARGE.

SHOWERS ARE STILL EXPECTED TO DEVELOP ALONG THE STALLING FRONT
THIS AFTERNOON STRETCHING FROM NERN SWWD ACROSS CENTRAL UT WHILE
THE NORTH AND FAR SW DRIES. A FEW SHOWERS COULD LINGER ALONG THE
OLD FRONT INTO THE NIGHT BUT CLEARING SKIES OVER THE NORTH SHOULD
ALLOW TEMPS TO DIP TO CHILLY LEVELS TONIGHT.

WEAK RIDGING ALOFT FOLLOWS THIS TROF FOR WED AND THE OLD FRONT
LIFTS N AS A WARM FRONT. ONLY EXPECT SOME CLOUDINESS AND NO PRECIP
WITH THE WARM FRONT. THE RIDGE AXIS SHIFTS E THU BUT HEIGHTS
CONTINUE TO RISE THU AND FRI WITH A WARM DRY SWLY FLOW IN PLACE.

UPDATED EARLIER TO LOWER POPS FOR MOST AREAS TODAY AND ADJUST
SKY COVER. RAISED WIND SPEEDS ACROSS THE NORTH THRU THE DAY
PARTICULARLY POST FRONTAL ACROSS THE NW DESERTS. MAY NEED TO
UPDATE AGAIN TO FURTHER LOWER POPS ACROSS THE NORTH THIS AFTN.

&&

.AVIATION...A COLD FRONT WILL MOVE ACROSS THE SLC TERMINAL BETWEEN
1620 AND 1630Z BASED ON THE CURRENT SPEED ASCERTAINED FROM THE TDWR.
WINDS WILL SHIFT FROM SOUTH TO NORTHWEST WITH GUSTS OVER 30 MPH
LIKELY AHEAD AND UP TO AN HOUR BEHIND THE FRONT. ANY TEMPORARY CIGS
ARE EXPECTED TO REMAIN ABOVE 7K FT AGL.

&&

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

$$

WILENSKY/STRUTHWOLF

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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