Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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FXUS65 KSLC 240954
AFDSLC

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
954 AM MDT FRI JUL 24 2015

.SYNOPSIS...SOUTHWESTERLY FLOW ALOFT WILL PREVAIL ACROSS THE REGION
THROUGH THE WEEKEND. MOISTURE WILL REMAIN CONFINED TO FAR NORTHWEST
UTAH THROUGH TONIGHT...OTHERWISE A DRY AIRMASS WILL SETTLE ACROSS
THE AREA.

&&

.DISCUSSION...SOUTHWEST FLOW ALOFT REMAINS IN PLACE OVER UTAH EARLY
THIS MORNING AHEAD OF A WEAK SHORTWAVE TROUGH OVER NORTHERN
CALIFORNIA...THIS BEING THE SOUTHERN BRANCH OF A TROUGH THAT
PREVIOUSLY SPLIT OVER THE WESTERN CONUS. WITH THE TROUGH CONTINUING
TO SHEAR OUT...A BAND OF PRECIPITATION EXTENDS FROM CENTRAL NEVADA
THROUGH SOUTHEAST IDAHO WHILE CLIPPING FAR NORTHWEST UTAH.
MEANWHILE...DRIER AIR CONTINUES TO SPREAD THROUGH THE REST OF THE
FORECAST AREA...WITH GOES-ESTIMATED PWAT BETWEEN 0.3-0.5 INCHES
ACROSS ALL BUT THE NORTHWEST QUADRANT...WHERE 0.7-1.0 INCHES STILL
RESIDE.

THE UPSTREAM TROUGH WILL EJECT THROUGH THE EASTERN GREAT BASIN THIS
EVENING...WEAKENING AS IT DOES SO. THE ASSOCIATED PRECIPITATION MAY
IMPINGE FARTHER INTO NORTHWEST UTAH THIS AFTERNOON AS A RESULT...BUT
THEN QUICKLY TAPER OFF DURING THE EVENING HOURS.

DRIER AIR WILL CONTINUE TO SPREAD THROUGHOUT THE FORECAST AREA
THROUGH THE WEEKEND. THE PATTERN WILL AMPLIFY ON SUNDAY AS THE NEXT
TROUGH CARVES INTO THE PACNW. INCREASED SOUTHERLY FLOW AHEAD OF THIS
TROUGH WILL YIELD WARMER TEMPERATURES...BUT THIS WILL JUST PUT
CONDITIONS CLOSER TO NORMAL SINCE MANY SITES HAVE BEEN A BIT COOLER
THAN NORMAL OF LATE.

THE WARMING TREND WILL BE SHORT-LIVED WITH THE TROUGH TRANSLATING
EAST AND GRAZING NORTHERN UTAH LATE MONDAY. A DRY COLD FRONT ON
MONDAY WILL PRECEDE THIS TROUGH...BRINGING A NOTICEABLE DROP IN
TEMPERATURES MONDAY AND TUESDAY FOR MUCH OF NORTHERN AND CENTRAL
UTAH.

BEHIND THE TROUGH...A WEST-NORTHWEST FLOW WILL SETTLE INTO
UTAH...KEEPING THE AIRMASS DRY BUT ALLOWING TEMPERATURES TO
GRADUALLY WARM BACK UP THROUGH LATE WEEK.

&&

.AVIATION...THE SLC TERMINAL WILL SEE VFR CONDITIONS THROUGHOUT THE
DAY WITH MOSTLY CLEAR SKIES. SOUTHEAST WINDS ARE EXPECTED TO SHIFT
TO THE NORTHWEST BETWEEN 20Z AND 22Z. THERE IS A 20 PERCENT CHANCE
THIS SHIFT WILL OCCUR LATER THAN EXPECTED OR WILL NOT OCCUR AT ALL.

&&

.FIRE WEATHER...DRIER AIR HAS SPREAD ACROSS MUCH OF THE FIRE
DISTRICT. HOWEVER...MOISTURE AND INSTABILITY WILL LINGER OVER FAR
NORTHWEST UTAH THOUGH TONIGHT...RESULTING IN A FEW SHOWERS AND
THUNDERSTORMS. A DRY AND STABLE AIRMASS WILL SPREAD ACROSS THE
ENTIRE DISTRICT THIS WEEKEND. SEASONABLE TEMPERATURES CAN BE
EXPECTED THROUGH SATURDAY...WITH A BIT OF WARMING ON SUNDAY.
SOUTHWEST WINDS WILL BE A BIT GUSTY IN SOME PLACES TODAY BEFORE
DECREASING OVER THE WEEKEND.

&&

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

$$

CHENG/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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