Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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000
FXUS65 KSLC 110925
AFDSLC

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
325 AM MDT THU SEP 11 2014

.SYNOPSIS...A DRY COLD FRONT WILL CROSS THE REGION TODAY THROUGH
TONIGHT. HIGH PRESSURE WILL RETURN WITH A WARMING TREND INTO THE
UPCOMING WEEKEND.

&&

.SHORT TERM (THROUGH 06Z MONDAY)...A LONGWAVE TROUGH ENCOMPASSES
THE NORTHERN ROCKIES EASTWARD THROUGH THE NORTHERN PLAINS AND
UPPER MIDWEST EARLY THIS MORNING. THE ASSOCIATED SURFACE COLD
FRONT IS CURRENTLY SAGGING SOUTHWARD ACROSS NORTHERN UT...AND
WILL CONTINUE SOUTHWARD ACROSS CENTRAL UT TODAY...AND EVENTUALLY
SOUTHERN UT TONIGHT. THIS WILL KNOCK A FEW DEGREES OFF
TEMPERATURES IN THE NORTH BUT HAVE LITTLE IF ANY IMPACT ACROSS
CENTRAL AND SOUTHERN UT.

A SHORTWAVE TROUGH NOTED ALONG THE BACKSIDE OF THE AFOREMENTIONED
LONGWAVE IS CURRENTLY DIGGING THROUGH THE NORTHERN ROCKIES...AND
WILL CONTINUE ON A SOUTHEASTWARD TRAJECTORY INTO THE HIGH PLAINS
OF WESTERN SD/NE BY FRIDAY MORNING. A RE-ENFORCING SHOT OF COOLER
AIR WILL PUSH INTO SOUTHWEST WY AND ADJACENT PORTIONS OF NORTHERN
UT OVERNIGHT...WITH A DEVELOPING EASTERLY GRADIENT LIKELY
RESULTING IN GUSTY WINDS NEAR CANYON MOUTHS OVERNIGHT INTO FRIDAY
MORNING. AS THIS IS PRIMARILY A SHALLOW SURFACE GRADIENT DRIVEN
EASTERLY WIND EVENT LACKING IN DEEPER COLD ADVECTION...AM NOT
ANTICIPATING A LARGER SCALE DOWNSLOPE WIND EVENT ALONG THE
NORTHERN WASATCH FRONT...WITH GUSTY WINDS LIKELY CONFINED TO AIR
FUNNELING THROUGH PARLEYS...WEBER...AND A HANDFUL OF OTHER
NORTHERN UT CANYONS.

WITH CLEAR SKIES AND THIS COLDER AIR FUNNELING INTO THE
AREA...MAY SEE MIN TEMPERATURES APPROACH THE FREEZING MARK WITHIN
THE CACHE VALLEY AND WASATCH BACK AREAS...HOWEVER A HARD FREEZE IS
NOT CURRENTLY ANTICIPATED.

MID LEVEL RIDGING IS FORECAST TO STRENGTHEN ACROSS THE REGION
DURING THE UPCOMING WEEKEND...ALLOWING FOR A WARMING TREND ACROSS
THE FORECAST AREA...MOST NOTABLY OVER NORTHERN UT/SOUTHWEST WY.
ANY APPRECIABLE MOISTURE DURING THIS TIMEFRAME IS EXPECTED TO
REMAIN CONFINED ACROSS THE DESERT SOUTHWEST ALLOWING FOR A DRY
FORECAST THROUGH THE WEEKEND.

&&

.LONG TERM (AFTER 06Z MONDAY)...MOISTURE WILL CONTINUE TO INCREASE
OVER THE FORECAST AREA EARLY IN THE WEEK UNDER WEST TO SOUTHWEST
FLOW ALOFT. THIS WILL ALLOW FOR A FEW SHOWERS AND THUNDERSTORMS TO
DEVELOP OVER THE HIGHER TERRAIN DURING THE AFTERNOON AND EVENING
HOURS. WITH THIS IN MIND...HAVE MAINTAINED GOING SLIGHT CHANCE POPS
FOR THE MOUNTAINS FROM THE PREVIOUS FORECAST PACKAGE. LITTLE CHANGE
IN TEMPERATURES IS EXPECTED DURING THE LATTER HALF OF THE FORECAST
PERIOD...WITH MAXES REMAINING NEAR TO SLIGHTLY ABOVE SEASONAL NORMS.

&&

.AVIATION...THE SLC TERMINAL WILL SEE VFR CONDITIONS AND CLEAR
SKIES THROUGHOUT THE DAY. LIGHT NORTHERLY WINDS MAY OCCASIONALLY
BECOME LIGHT AND VARIABLE DURING THE EARLY MORNING BEFORE INCREASING
OUT OF THE NORTHWEST BETWEEN 15Z AND 17Z.

&&

.FIRE WEATHER...DRY AND STABLE CONDITIONS WILL PERSIST OVER THE FIRE
DISTRICT TODAY UNDER A WEST TO NORTHWEST FLOW ALOFT. A DRY COLD
FRONT WILL MOVE THROUGH UTAH THIS MORNING...COOLING TEMPERATURES
OVER NORTHERN UTAH. TEMPERATURES WILL BE SLOW TO INCREASE TOMORROW
BUT WILL REBOUND OVER THE WEEKEND AS HIGH PRESSURE BUILD OVER THE
FORECAST AREA. SOME MOISTURE MAY RETURN TO THE DISTRICT EARLY NEXT
WEEK...RESULTING IN A FEW SHOWERS AND THUNDERSTORMS OVER THE HIGHER
TERRAIN.

&&

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

$$

SEAMAN/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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