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000
FXUS65 KSLC 022310
AFDSLC

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
ISSUED BY NATIONAL WEATHER SERVICE GRAND JUNCTION CO
410 PM MST MON DEC 2 2013

.SYNOPSIS...A VERY COLD UPPER TROUGH WILL SETTLE OVER THE WESTERN
STATE TONIGHT THROUGH WEDNESDAY BRINGING SNOW TO MUCH OF THE AREA.
A STRONG COLD FRONT WILL PUSH TO CENTRAL UTAH BY MIDDAY TUESDAY
AND THEN EXIT THE AREA ON WEDNESDAY.

&&

.SHORT TERM (TONIGHT THROUGH WEDNESDAY)...

UPPER LEVEL LOW DROPPING FROM SW CANADA INTO THE PACIFIC NORTHWEST
WITH THE ASSOCIATED COLD FRONT PUSHING INTO SWRN ID. STEADY STREAM
OF PACIFIC MOISTURE IS KEEPING CLOUDS ACROSS ABOUT THE NORTHERN HALF
OF THE FORECAST AREA. ECHOES SLOWLY EXPANDING ON KMTX RADAR ALONG
THE WASATCH FRONT. DRY SUB-LAYER SEEMS TO BE KEEPING THE SLC VALLEY
METARS DRY SO FAR THOUGH LIKELY SOME VIRGA...BUT WEBCAMS OVER THE
NRN MTNS SUGGEST SOME LIGHT SNOW AT LEAST OVER THE PEAKS. LIGHT SNOW
NOTED IN EVANSTON WY.

THE WINTER STORM STILL LOOKS ON TRACK TO AFFECT MOST OF THE AREA
TONIGHT THROUGH WEDNESDAY...AND MADE NO CHANGES TO THE CURRENT SET
OF HIGHLIGHTS. COLD FRONT PUSHES INTO NW UT THIS EVENING AND OVER
THE CENTRAL PORTION OF THE STATE TUE AS THE UPPER TROUGH SETTLES
OVER THE REGION. FRONT THEN SLOWS OR STALLS ACROSS CENTRAL UT TUE AS
A SECONDARY SHORTWAVE DROPS INTO THE NRN CA/WRN NV. THIS WAVE THE
EJECTS EASTWARD ACROSS UT TUE NIGHT/WED HELPING TO PUSH THE FRONT ON
ITS WAY. ISENTROPIC SURFACES SHOW A STEADY SUPPLY OF PACIFIC
MOISTURE ALONG THE FRONT WHERE FRONTOGENETIC FORCING AND JET
DYNAMICS SHOULD COMBINE TO PRODUCE PERIODS OF HEAVY SNOW IN THE
VICINITY OF THE FRONT. THE MOISTURE TAP IS RATHER NARROW IN THE
MODELS...HOWEVER...SO SNOW SHOULD BEGIN TAPERING OFF ACROSS NW UT BY
TUE EVENING/NIGHT.

&&

.LONG TERM (WEDNESDAY NIGHT THROUGH MONDAY)...

VERY COLD AIR SETTLES OVER THE REGION WED NIGHT AND THEN SHOULD
REMAIN ENTRENCHED IN THE VALLEYS FOR THE REMAINDER OF THE WEEK. THE
UPPER TROUGH REMAINS OVER THE REGION THROUGH THU BEFORE SHIFTING
EAST. BUT...MODELS QUICKLY REPLACE IT WITH ANOTHER ONE DROPS IN FROM
THE NORTHWEST THIS WEEKEND FOR ANOTHER CHANCE OF SNOW.

&&

.AVIATION...

GUSTY WINDS CONTINUE AT KSLC THIS AFTERNOON. STILL EXPECTING COLD
FRONTAL PASSAGE BETWEEN 05Z-08Z WITH WINDS AT KSLC VEERING FROM SW
TO NW DURING THIS TIME. AHEAD OF THE FRONT...A MIX OF -RN/-SN
SHOULD DEVELOP AFTER 02Z-03Z BEFORE CHANGING TO ALL SNOW BY 08Z.
EXPECT IFR CONDITIONS WITH AND BEHIND FRONTAL PASSAGE. PERIODS OF
LIFR CIGS/VIS ARE POSSIBLE IN HEAVIER SNOW. EXPECT SOME SNOW
ACCUMULATION ACROSS THE AIRFIELD ON UNTREATED SURFACES BY 12Z TUE.

&&

.SLC WATCHES/WARNINGS/ADVISORIES...
UT...WINTER STORM WARNING UNTIL 4 PM MST WEDNESDAY FOR
     UTZ006-008>010.

     WINTER WEATHER ADVISORY UNTIL NOON MST TUESDAY FOR
     UTZ001-002-005-007.

     WINTER STORM WARNING FROM MIDNIGHT TONIGHT TO 4 PM MST WEDNESDAY
     FOR UTZ003-004.

     WINTER STORM WARNING FROM 6 AM TUESDAY TO 4 PM MST WEDNESDAY FOR
     UTZ013-517-518.

     WINTER WEATHER ADVISORY UNTIL 4 PM MST WEDNESDAY FOR UTZ011.

     WINTER STORM WARNING FROM 6 AM TUESDAY TO 4 PM MST WEDNESDAY FOR
     UTZ012-014>016.

WY...WINTER WEATHER ADVISORY UNTIL NOON MST TUESDAY FOR WYZ021.

&&

$$

PUBLIC...DANIELS GJT
AVIATION...DANIELS/MEYERS GJT

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)