Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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000
FXUS65 KSLC 220517
AFDSLC

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
1016 PM MST SUN DEC 21 2014

.SYNOPSIS...A VERY MOIST AND STRONG NORTHWEST FLOW WILL CONTINUE
ACROSS NORTHERN AND CENTRAL UTAH TONIGHT INTO MONDAY. A COLD
FRONT WILL MOVE SOUTH ACROSS THE AREA LATE TONIGHT AND MONDAY
BRINGING A COOLER BUT DRIER AIRMASS INTO THE REGION THROUGH
WEDNESDAY.

&&

.DISCUSSION...AN ANOMALOUSLY MOIST AIRMASS CONTINUES TO BRING
SIGNIFICANT PRECIPITATION TO THE AREA WITH THE ATMOSPHERIC RIVER
PENETRATING THE PACIFIC NORTHWEST INTO UTAH. MANY REPORTS OF STORM
TOTALS OVER TWO INCHES WATER IN THE NORTHERN MOUNTAINS SO FAR.
MOISTURE SURGE MAXING OUT THIS EVENING BUT WILL START TO GET CUT OFF
TONIGHT AS COLD FRONT CROSSING NORTHERN UTAH THIS EVENING SPREADS
DRIER AIR INTO THE AREA. FOCUS OF PRECIPITATION WILL SHIFT SOUTH TO
AROUND I-80 AND INTO THE CENTRAL UTAH MOUNTAINS WHILE PRECIPITATION
RATES START TO DECLINE CLOSER TO THE IDAHO BORDER.
HOWEVER...PRECIPITATION WILL NOT COMPLETELY END UP NORTH OWING TO
JET DYNAMICS WHICH CONTINUES THROUGH TOMORROW. IN CONJUNCTION WITH
THE COLDER AIR BEHIND THE FRONT...SNOW LEVELS WILL FALL OVERNIGHT
AND MAY REACH THE VALLEY FLOORS BY TOMORROW AFTERNOON BEFORE
PRECIPITATION TAPERS OFF. CURRENT BATCH OF WINTER STORM WARNINGS
CONTINUE.

WINDS STILL QUITE STRONG ACROSS THE HIGHER PEAKS AND WILL LIKELY NOT
SEE MUCH DECLINE THROUGH TOMORROW. ALSO STARTING TO SEE SOME
STRONGER GUSTS DOWNSLOPE ACROSS FAR NORTHWEST UTAH. AS THE GRADIENT
STRENGTHENS BEHIND THE FRONT TOMORROW...EXPECT THESE WINDS TO
INCREASE EVEN MORE. HAVE HOISTED A WIND ADVISORY AS A RESULT. ALSO
HAVE SOME CONCERN ABOUT DOWNSLOPE WINDS IN CASTLE COUNTRY WHICH
WOULD LIKELY PEAK TOMORROW AFTERNOON OR EARLY EVENING. FOR
NOW...WILL LET THE MIDNIGHT SHIFT HAVE ONE MORE LOOK AT THAT. THE
00Z MODELS DO SHOW STRONGER CROSS-BARRIER FLOW...JUST A MATTER OF
WHETHER THE AIRMASS ALLOWS THOSE STRONG WINDS TO SURFACE. WINDS
ACROSS SOUTHWEST WYOMING HAVE YET TO REACH WARNING CRITERIA.
HOWEVER...WINDS HAVE STARTED TO PICK UP AGAIN AND WITH SUCH STRONG
WINDS ALOFT WILL LET THAT WARNING CONTINUE ON.

UPDATED FORECAST FOR WIND AND ALSO MADE MINOR ADJUSTMENTS TO POP AND
SNOW LEVEL FOR A FEW ZONES.

&&

.AVIATION...SHOWERS ARE EXPECTED TO CONTINUE IN THE VICINITY OF THE
SLC TERMINAL THROUGH THE OVERNIGHT HOURS. OCCASIONAL CEILINGS NEAR
OR BELOW 6000 FEET AGL WILL REMAIN POSSIBLE THROUGH ABOUT 15-18Z.
NORTH TO NORTHWEST WINDS ARE EXPECTED TO CONTINUE AT THE TERMINAL
THROUGH THE OVERNIGHT HOURS.

&&

.SLC WATCHES/WARNINGS/ADVISORIES...
UT...WINTER STORM WARNING UNTIL 6 PM MST MONDAY FOR UTZ007>010-517.
     WIND ADVISORY UNTIL 8 PM MST MONDAY FOR UTZ005.
WY...HIGH WIND WARNING UNTIL 2 AM MST MONDAY FOR WYZ021.

&&

$$

CHENG/KRUSE

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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