Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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000
FXUS65 KSLC 211719
AFDSLC

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
1019 AM MST WED JAN 21 2015

.SYNOPSIS...HIGH PRESSURE ALOFT WILL EXPAND ACROSS THE WESTERN
STATES THROUGH THE LATTER HALF OF THE WEEK.

&&

.DISCUSSION...THE DEFORMATION AND OVERRUNNING ALONG THE NORTH SIDE
OF THE AZ UPPER LOW HAVE SHIFTED OUT OF THE CWA AT THIS TIME AND
THE PRECIP THREAT ACROSS THE SOUTHERN CWA FROM THIS HAS ENDED.

THE COLD WAVE DROPPING OUT OF THE NORTH THRU WY WILL CONTINUE TO
PUSH COLDER AIR WWD AT LOW LEVELS INTO THE CWA. THIS HAS
GENERATED PATCHY STRATOCUMULUS ALONG THE N SLOPES OF THE UINTAS
NWD THRU THE BEAR RIVER VALLEY. SOME HAS ALSO FORMED IN UTAH AND
SRN SALT LAKE COUNTIES. SOMEWHAT MORE EXTENSIVE STRATUS REMAINS IN
THE UINTA BASIN AND AROUND RICHFIELD SWD THE NEAR CEDAR CITY.
EXPECT THIS TO TEND TO BURN OFF THIS AFTN BUT SOME COULD LINGER
TONIGHT.

THIS LOW LEVEL COLD ADVECTION HAS ALSO TIGHTENED THE NORTHERLY
SURFACE PRESSURE GRADIENT ACROSS THE CWA PARTICULARLY OVER THE
SOUTH. THIS HAS GENERATED LOCAL GUSTY NORTH WINDS ACROSS PORTIONS
OF SRN UT INCLUDING WASHINGTON CO. EXPECT THESE TO CONTINUE THRU
TONIGHT AND BECOME A BIT STRONGER. HOWEVER DO NOT ANTICIPATE
SUSTAINED SPEEDS STRONG ENOUGH TO WARRANT AN ADVISORY AT THIS
TIME.

THE LOW LEVEL COOLING SHOULD ALSO KEEP THE AIR QUALITY FROM
DETERIORATING TODAY ALTHO EXPECT STAGNANT CONDITIONS TO DEVELOP
TOMORROW AND THE WEAK SPLITTING WAVE THAT CROSSES THE REGION FROM
THE NORTH FRI WILL HAVE LITTLE IMPACT.

UPDATED THE FORECAST EARLIER TO ADJUST SKY COVER TOWARDS CURRENT
TRENDS AND TO REMOVE POPS FROM SRN UT. NO ADDITIONAL UPDATES
PLANNED.

&&

.AVIATION...THE SLC TERMINAL WILL SEE VFR CONDITIONS THROUGHOUT THE
DAY. SCATTERED LOW CLOUDS ALONG THE SOUTHERN END OF THE SALT LAKE
VALLEY SHOULD NOT PRODUCE ANY LOW CIGS AT THE TERMINAL. LIGHT WINDS
ARE EXPECTED TO BECOMING PREVAILING NORTHWESTERLY BETWEEN 17Z AND
19Z.

&&

.SLC WATCHES/WARNINGS/ADVISORIES...
UT...NONE.
WY...NONE.
&&

$$

PUBLIC...WILENSKY
AVIATION...TRAPHAGAN

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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