Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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000
FXUS65 KSLC 220439
AFDSLC

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
939 PM MST FRI NOV 21 2014

.SYNOPSIS...A MILD WESTERLY FLOW WILL BE OVER THE AREA TONIGHT. A
COLD FRONT WILL MOVE INTO NORTHERN UTAH SATURDAY AFTERNOON THEN
PUSH THROUGH THE REST OF THE AREA SATURDAY NIGHT. A COLD MOIST
NORTHWEST FLOW WILL CONTINUE OVER THE AREA THROUGH MONDAY.

&&

.DISCUSSION...STRONG UPPER JET ASSOCIATED WITH THE NEXT TROUGH IS
PUNCHING INTO THE PACIFIC NORTHWEST THIS EVENING. MOISTURE IN THE
FORM OF HIGH CLOUDS IS INCREASING OVER UTAH AT THIS TIME...WITH
DEEPER MOISTURE AND EVEN PRECIPITATION ALREADY DEVELOPING OVER
CENTRAL NEVADA. THIS IS ASSOCIATED WITH 700MB WARM ADVECTION WHICH
WILL MAXIMIZE OVER NORTHERN UTAH TOMORROW MORNING. FOR TONIGHT
THOUGH...PRECIPITATION SHOULD START FILLING INTO NORTHWEST UTAH
AFTER MIDNIGHT WITH SOUTH/SOUTHWEST WINDS INCREASING LATE.

AFOREMENTIONED WARM ADVECTION WILL ALLOW PRECIPITATION TO FILL IN
QUICKLY OVER NORTHERN UTAH TOMORROW MORNING...FAVORING THE NORTHERN
WASATCH MOUNTAINS/VALLEYS. THE AIRMASS WILL BE MIXED ENOUGH TO KEEP
SNOW LEVELS OFF THE VALLEYS FOR MUCH OF THE DAY. THE COLD FRONT WILL
THEN PUSH THROUGH NORTHERN UTAH TOMORROW AFTERNOON BEFORE SWEEPING
ACROSS SOUTHERN UTAH DURING THE LATE EVENING HOURS. PRECIPITATION
WILL FOLLOW THE FRONT THROUGH MUCH OF THE FORECAST AREA...SO
WIDESPREAD PRECIPITATION IS ANTICIPATED. SNOW LEVELS WILL
LOWER TO THE VALLEY FLOORS SATURDAY EVENING ACROSS THE NORTH AND
SATURDAY NIGHT ACROSS THE SOUTH.

THERE COULD BE SOMEWHAT OF A BREAK IN PRECIPITATION TOMORROW NIGHT
BEGINNING SEVERAL HOURS BEHIND FROPA...BUT SNOW WILL FILL IN AGAIN
SUNDAY MORNING AS COLDER AIR ALOFT ACCOMPANIES THE NEXT EMBEDDED
IMPULSE. SUNDAY AFTERNOON SHOULD SEE ANOTHER BRIEF LULL AS SHORTWAVE
RIDGING DEVELOPS OVER THE AREA BEFORE ONE FINAL DISTURBANCE GRAZES
NORTHERN UTAH SUNDAY NIGHT THROUGH MONDAY MORNING.

WITH AMPLE MOISTURE AND MULTIPLE DISTURBANCES OFFERING UP SNOW OVER
A 2-3 DAY PERIOD...SIGNIFICANT PRECIPITATION CAN BE
EXPECTED...ESPECIALLY ACROSS THE NORTH. NORTHERN MOUNTAINS WILL SEE
SIGNIFICANT SNOWFALL...BUT MANY NORTHERN AND WESTERN VALLEY LOCALES
WILL LIKELY SEE ACCUMULATING SNOW AS WELL. WINTER WEATHER HIGHLIGHTS
REMAIN IN PLACE FOR THE NORTHERN MOUNTAINS...MOUNTAIN VALLEYS AND
SOUTHWEST WYOMING.

NO UPDATES THIS EVENING.

&&

.AVIATION...VFR CONDITIONS WILL PERSIST AT THE SLC TERMINAL THROUGH
THE REMAINDER OF THE NIGHT. CIGS WILL BEGIN TO LOWER AFTER
MIDNIGHT...LIKELY DROPPING TO ABOUT 6000 FT AGL BETWEEN 13-15Z AS
RAIN SHOWERS CREEP CLOSER TO THE TERMINAL. THERE IS A 30 PERCENT
CHANCE OF MVFR CONDITIONS WITH VICINITY SHOWERS THROUGHOUT THE
MORNING. SOUTHEAST WILL CONTINUE THROUGH EARLY TOMORROW
AFTERNOON...BUT WINDS WILL INCREASE LATE TONIGHT AND MAY ESCALATE TO
AIRPORT WARNING CRITERIA BETWEEN 13Z AND 22Z.

&&

.SLC WATCHES/WARNINGS/ADVISORIES...
UT...WINTER WEATHER ADVISORY FROM 5 AM SATURDAY TO 5 PM MST MONDAY
     FOR UTZ006-010.

     WINTER STORM WARNING FROM 5 AM SATURDAY TO 5 PM MST MONDAY FOR
     UTZ007>009.

WY...WINTER WEATHER ADVISORY FROM 8 AM SATURDAY TO 9 AM MST SUNDAY
     FOR WYZ021.

&&

$$

CHENG/VERZELLA

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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