Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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000
FXUS65 KSLC 241550
AFDSLC

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
950 AM MDT TUE MAR 24 2015

.SYNOPSIS...ANOTHER STORM SYSTEM WILL CROSS MAINLY NORTHERN UTAH
AND SOUTHWEST WYOMING TODAY INTO TONIGHT. STRONG HIGH PRESSURE
ALOFT WILL RETURN FOR THE LATTER HALF OF THE WEEK.


&&

.DISCUSSION...THE NEXT IN A SERIES OF WEAK SHORTWAVE TROUGHS IS
BEGINNING TO IMPACT UTAH AND SOUTHWEST WYOMING THIS MORNING...WITH
WARM ADVECTION PRECIPITATION FILLING IN ACROSS THE UTAH/IDAHO
BORDER. THIS PRECIPITATION WILL EVENTUALLY PUSH SOUTHWARD THROUGH
THE DAY...AS THE SHORTWAVE DROPS SOUTH AND PUSHES THE ASSOCIATED
COLD FRONT THROUGH THE ENTIRETY OF UTAH LATE TODAY AND TONIGHT.

WHILE THE BEST SYNOPTIC-SCALE FORCING TODAY WILL REMAIN RESTRICTED
TO THE NORTHERN THIRD OF THE CWA...ENOUGH MOISTURE AND INSTABILITY
IS STILL LINGERING OVER CENTRAL AND SOUTHERN UTAH THAT THE NAM AND
HRRR ARE PRODUCING SPOTTY CONVECTION OVER THE HIGHER TERRAIN. HAVE
EXPANDED SLIGHT CHANCE POPS TO THE CENTRAL AND SOUTHERN MOUNTAINS
WITH THE MORNING UPDATE AND ADDED A MENTION OF THUNDER.

FORECAST CHALLENGES TODAY WILL BE THE PLACEMENT AND INTENSITY OF
LINGERING PRECIPITATION THIS EVENING...AS WELL AS THE STRENGTH OF
WINDS BEHIND THE COLD FRONT TONIGHT...ESPECIALLY IN DOWNSLOPE
PRONE AREAS SUCH AS CASTLE COUNTRY AND WASHINGTON COUNTY UTAH.
WILL CONSIDER WHETHER AN ADVISORY IS NEEDED FOR THESE WINDS.

UPDATED EARLIER TO INCREASE POPS AND SKY COVER ACROSS CENTRAL AND
SOUTHERN UTAH FOR THIS AFTERNOON. OTHERWISE...THE FORECAST LOOKS
GOOD AND NO FURTHER UPDATES ARE ANTICIPATED THIS MORNING. WILL
WATCH CONVECTION THROUGH THIS AFTERNOON TO SEE IF A LATER UPDATE
IS NEEDED IN VALLEY LOCATIONS ACROSS THE SOUTH WHERE THERE ARE
CURRENTLY NO MENTIONABLE POPS.

&&

.AVIATION...WINDS AT THE SLC TERMINAL ARE EXPECTED TO SWITCH TO
THE WEST-NORTHWEST BETWEEN 20Z AND 22Z TODAY...BUT THERE IS A
CHANCE THAT WINDS REMAIN SOUTHERLY UNTIL THE TRUE COLD FRONTAL
PASSAGE AROUND 00Z. SHOWERS WILL BEGIN FILLING IN ACROSS NORTHERN
UTAH LATER TODAY...AND WILL LIKELY BEGIN AT THE SLC TERMINAL
BETWEEN 20Z AND 23Z. CEILINGS SHOULD DROP BELOW 7000FT UNDER THESE
SHOWERS...WITH MVFR CONDITIONS AND ERRATIC WINDS ALSO POSSIBLE
WITH THE HEAVIEST SHOWERS.

&&

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

$$

SCHOENING

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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