Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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000
FXUS65 KSLC 160404
AFDSLC

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
1004 PM MDT WED APR 15 2015

.SYNOPSIS...A COLD UPPER LEVEL LOW PRESSURE SYSTEM WILL SETTLE
OVER THE FOUR CORNERS LATE TONIGHT THROUGH EARLY FRIDAY. HIGH
PRESSURE ALOFT WILL STRENGTHEN TO THE WEST OF UTAH FOR THE
WEEKEND.

&&

.DISCUSSION...AN UPPER LOW REMAINS CENTERED OVER EAST-CENTRAL UTAH
THIS EVENING PER WATER VAPOR IMAGERY AND LATEST RAP. TROWAL FEATURE
WITH MOISTURE WRAPPING AROUND SAID LOW CONTINUES TO PRODUCE
PRECIPITATION ACROSS NORTHERN UTAH. A WEAK VORT MAX IS SEEN ON WATER
VAPOR ROTATING SOUTH ACROSS NORTHWEST UTAH...WHICH IS HELPING TO
SHIFT THE HEAVIER PRECIPITATION INTO WEST-CENTRAL UTAH. THIS WILL
THEN CONTINUE TO TRACK TOWARDS SOUTHWEST UTAH LATE TONIGHT.
MEANWHILE...WINDS ARE TURNING MORE EASTERLY ACROSS NORTHERN UTAH
MAKING PRECIPITATION LESS FAVORABLE FOR THE WASATCH FRONT. IN
GENERAL...EXPECT TO SEE PRECIPITATION ACROSS MUCH OF NORTHWEST AND
NORTH-CENTRAL UTAH TAPER OFF SIGNIFICANTLY...IF NOT COMPLETELY IN
SOME AREAS...AFTER MIDNIGHT WHILE PRECIPITATION STARTS TO FILL IN
MORE ACROSS THE SOUTHWEST.

MOST OF THE SNOW IN THE VALLEYS EARLIER THIS EVENING DID NOT
ACCUMULATE VERY EFFICIENTLY DUE TO WARM SURFACES...ALTHOUGH THIS IS
CHANGING WITH THE NIGHTTIME HOURS. WITH PRECIPITATION SHIFTING
SOUTH...THIS WOULD RESULT IN GREATER IMPACTS ACROSS WEST-CENTRAL AND
SOUTHWEST UTAH...WHERE A WINTER WEATHER ADVISORY REMAINS IN
EFFECT...IN ADDITION TO ALL MOUNTAIN ZONES.

ALTHOUGH 700MB WARM ADVECTION IS OCCURRING ACROSS THE AREA...THE
AIRMASS IS STILL RELATIVELY COLD. WITH MANY VALLEY TEMPERATURES
CURRENTLY HOVERING IN THE 30S...THERE IS A POTENTIAL FOR A HARD
FREEZE TONIGHT. CLOUD COVER AND LOCALLY ENHANCED WINDS WILL LIMIT
THE EXTENT OF COOLING SO WHILE A HARD FREEZE CONDITIONS MAY NOT BE
WIDESPREAD...MANY VALLEY ZONES ARE EXPECTED TO SEE SOME SPOTS
HIT CRITERIA.

MADE SEVERAL MINOR UPDATES TO FORECAST...OTHERWISE THE PACKAGE IS IN
GOOD SHAPE.

&&

.AVIATION...SNOW WILL CONTINUE TO TAPER OFF AT THE SLC TERMINAL
THROUGH AROUND 06Z...AND VISIBILITIES WILL GRADUALLY IMPROVE TO VFR
DURING THAT TIME. HOWEVER...CIGS WILL LIKELY REMAIN MVFR THROUGH
AROUND 08-09Z...THEN RISE TO BETWEEN 5000-6000FT FOR THE REMAINDER
OF THE NIGHT. SOUTH WINDS SHOULD SETTLE IN BY 05Z.

&&

.SLC WATCHES/WARNINGS/ADVISORIES...
UT...WINTER WEATHER ADVISORY UNTIL 4 AM MDT THURSDAY FOR UTZ007>009.

     WINTER WEATHER ADVISORY UNTIL 11 AM MDT THURSDAY FOR UTZ015-016.

     WINTER WEATHER ADVISORY UNTIL 5 PM MDT THURSDAY FOR UTZ010-517-
     518.

     HARD FREEZE WARNING UNTIL 9 AM MDT THURSDAY FOR UTZ001>005-
     011>016.

WY...NONE.
&&

$$

CHENG

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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