Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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000
FXUS65 KSLC 302149
AFDSLC

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
349 PM MDT THU APR 30 2015

.SYNOPSIS...A WEAK COLD FRONT WILL STALL ACROSS CENTRAL UTAH
TODAY. A MILD WESTERLY FLOW WILL DEVELOP ACROSS THE REGION FRIDAY
THROUGH THE WEEKEND WITH A GRADUAL INCREASE IN MOISTURE.



&&

.SHORT TERM (THROUGH 00Z MONDAY)...A SHORTWAVE TROUGH CONTINUES TO
TRACK ACROSS WYOMING AND THE DAKOTAS THIS AFTERNOON...WITH THE
ASSOCIATED SURFACE COLD FRONT STALLED OVER CENTRAL UTAH. ISOLATED
CONVECTION HAS BEGUN TO INITIATE ALONG THIS BOUNDARY...AND WILL
LIKELY CONTINUE ACROSS CENTRAL UTAH INTO THE EVENING HOURS.
THUNDERSTORMS WILL LIKELY CONTINUE FORMING ALONG THE HIGHER
TERRAIN FOR A FEW HOURS AS WELL...PARTICULARLY OVER THE EASTERN
UINTAS.

THE SURFACE PRESSURE GRADIENT AND BAROCLINIC ZONE WILL RELAX
THROUGH THE OVERNIGHT HOURS...AS THE TROUGH EXITS TO THE EAST AND
HIGH PRESSURE BUILDS OVER THE DESERT SOUTHWEST. SOME LINGERING
MOISTURE SHOULD ALLOW DIURNAL CONVECTION TO DEVELOP ONCE AGAIN
TOMORROW...AND PERSISTENT SOUTHWESTERLY FLOW WILL HELP PULL IN
SOME ADDITIONAL MOISTURE HEADING INTO THE WEEKEND. COMBINED WITH
SOME WEAK DISTURBANCES MOVING THROUGH...COVERAGE OF SHOWERS AND
THUNDERSTORMS COULD INCREASE A BIT FOR SATURDAY AND SUNDAY.
OTHERWISE...EXPECT TEMPERATURES TO REMAIN QUITE WARM FOR EARLY
MAY...WITH THE POSSIBILITY OF TEMPERATURES APPROACHING 80 AGAIN
ALONG THE WASATCH FRONT.


.LONG TERM (AFTER 00Z MONDAY)...UPPER LEVEL FLOW WILL TURN MORE
SOUTHWESTERLY ON MONDAY DUE TO A LOW PRESSURE SYSTEM MOVING INTO
CALIFORNIA FROM THE PACIFIC. THIS FLOW ALOFT WILL CONTINUE TO BRING
MOISTURE AND INSTABILITY TO THE REGION KEEPING THE POTENTIAL FOR
SHOWERS AND THUNDERSTORMS IN THE FORECAST THROUGH MID WEEK. THE LOW
WILL EVENTUALLY PASS JUST SOUTH OF THE FOUR CORNERS AREA EARLY
TUESDAY AND PROGRESS INTO COLORADO. AT THE SAME TIME A SECOND AND
MUCH STRONGER PACIFIC LOW PRESSURE SYSTEM WILL MOVE ONTO THE
WASHINGTON AND OREGON COAST. UNCERTAINTY EXISTS IN HOW FAR TO THE
SOUTHEAST THIS SYSTEM WILL PROGRESS BEFORE EXITING EASTWARD. THE
MOST LIKELY SCENARIO IS FOR THE LOW PRESSURE TO MOVE INTO SOUTHERN
IDAHO WHICH WILL PUT UTAH IN A PLACE FOR STRONG SOUTHWESTERLY WINDS
ACROSS THE SOUTH AND MORE CHANCES OF SHOWERS AND THUNDERSTORMS
THROUGH THE END OF THE WEEK FOR ALL OF UTAH. WHETHER OR NOT THE LOW
PRESSURE SYSTEM REMAINS OVER THE AREA OR EXISTS TO THE EAST BEFORE
THE WEEKEND IS STILL UNCERTAIN.

&&

.AVIATION...WINDS WILL REMAIN FROM THE NORTHWEST AND GUSTY FOR THE
KSLC TERMINAL THROUGH SUNSET. WINDS WILL TURN TO THE SOUTH A
LITTLE LATER THAN NORMAL AND CAN BE EXPECTED BETWEEN 05Z AND 06Z.

&&

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

$$

SHORT TERM...SCHOENING
LONG TERM/AVIATION...LOEFFELBEIN

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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