Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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000
FXUS65 KSLC 010257
AFDSLC

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
857 PM MDT FRI OCT 31 2014

.SYNOPSIS...A MILD AND INCREASINGLY STRONG SOUTHERLY FLOW WILL
REMAIN OVER THE AREA THROUGH EARLY SATURDAY. A VIGOROUS PACIFIC
STORM SYSTEM WILL REACH UTAH SATURDAY. COOL AND UNSETTLED WEATHER
WILL REMAIN OVER THE AREA SATURDAY NIGHT THROUGH EARLY MONDAY.

&&

.DISCUSSION...A VERY MILD SLY FLOW REMAINS OVER THE CWA THIS EVE
DOWNSTREAM FROM A COLD TROF ALONG THE WEST COAST. CONSIDERABLE
HIGH LEVEL MOISTURE IS STREAMING NORTH THRU THE WRN CWA AND MID
LEVEL MOISTURE OVER THE SE IS GENERATING SOME SCATTERED CLOUDINESS
THERE.

HIGHS TODAY REACH RECORD LEVELS IN AREAS THAT MIXED OUT WITH THE
77 AT SALT LAKE CITY BECOMING THE HIGHEST READING EVER RECORDED
SO LATE IN THE YEAR. (NO EQUAL OR HIGHER RECORDS EXIST BETWEEN
TODAY AND MAR 24)

WINDS HAVE DECOUPLED SOMEWHAT THIS EVE BUT EXPECT THEM TO INCREASE
OVERNIGHT AS THE STRONG SHORT WAVE CURRENTLY IN THE BASE OF THE
EPAC TROF BEGINS TO LIFT NEWD THRU SRN CA AND SURFACE PRESSURES
START TO FALL OVER CENTRAL AND NERN NV TIGHTENING THE GRADIENT
ACROSS UT. WINDS SHOULD CONTINUE TO INCREASE THROUGH ABOUT MIDDAY
AS THE WAVE LIFTS THRU THE ERN GREAT BASIN THEN REMAIN STRONG FOR
A TIME IN THE WAKE OF THIS FEATURE. EXPECT THE STRONGEST WINDS
OVER THE MTNS AND WEST ALTHO SPEEDS NOT MUCH LOWER COULD ALSO
OCCUR OVER SERN UT IN THE AFTN PER NEW 00Z NAM. CURRENT SUITE OF
WIND HIGHLIGHTS APPEARS ON TRACK AND MAY NEED TO BE EXPANDED INTO
THE EAST IF THE REMAINING GUIDANCE AGREES. WILL INDICATE GREATER
POTENTIAL FOR WARNING LEVELS SPEEDS TO DEVELOP ACROSS MORE OF THE
WEST TONIGHT INSTEAD OF TOMORROW MORNING IN STATEMENT UPDATE.

LATEST NAM IS STILL A BIT SPARSE WITH THE PRECIP WITH THE ENTIRE
EVENT BUT DOES HAVE AN ORGANIZED BAND LIFTING THRU THE CWA
TOMORROW AFTN ALONG THE COLD FRONT. TEMPS DONT COOL DOWN ALL THAT
MUCH RIGHT WITH THE FRONT WAITING UNTIL LATER IN THE EVE AS
PRECIP IS TAPERING OFF. SO THE THREAT OF WINTER WEATHER IMPACTS ON
TRAVEL LOOK TO BE LIMITED TO THE HIGHER ELEVATIONS...SUCH AS
MIRROR LAKE HIGHWAY IN THE NORTH AND SR143 AND 14 DOWN SOUTH. THIS
WOULD BE TOO HIGH TO AFFECT THE MAJOR ROUTES THRU THE MTNS SUCH AS
I-80...I-40...I-70 AND US-6.

SOME SNOWFALL COULD REACH THE LOWER VALLEYS OF THE WEST ONCE
COLDER AIR ARRIVES LATER SAT NIGHT THRU EARLY MON BUT PRECIP
LOOKS VERY SHOWERY AND DISORGANIZED BY THEN SO THE THREAT OF ANY
VALLEY ACCUMULATION APPEARS SMALL.

UPDATED EARLIER TO ADJUST SKY COVER AND RAMP UP WINDS A BIT
OVERNIGHT. ALSO TRIMMED BACK OVERNIGHT POPS FROM NERN UT. NO
ADDITIONAL UPDATES PLANNED.

&&

.AVIATION...THE SLC TERMINAL WILL SEE VFR CONDITIONS THROUGH THE
NIGHT UNDER MID AND HIGH LEVEL CLOUDS. WINDS WILL BE SOUTHERLY
THROUGH THE OVERNIGHT HOURS. OCCASIONAL GUSTS TO 30 MPH WILL
DEVELOP AFTER ABOUT 06Z WITH PREVAILING GUSTS OVER 30 MPH AFTER
ABOUT 16Z SATURDAY.

&&

.SLC WATCHES/WARNINGS/ADVISORIES...
UT...WINTER WEATHER ADVISORY FROM MIDNIGHT TONIGHT TO 10 PM MDT
     SATURDAY FOR UTZ007>010-517-518.

     WIND ADVISORY FROM MIDNIGHT TONIGHT TO 10 PM MDT SATURDAY FOR
     UTZ001-002-004-006-014-016.

     HIGH WIND WARNING FROM MIDNIGHT TONIGHT TO 10 PM MDT SATURDAY
     FOR UTZ003-005-015.

WY...NONE.
&&

$$

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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