Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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000
FXUS65 KSLC 230414
AFDSLC

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
1014 PM MDT FRI APR 22 2016

.SYNOPSIS...A STORM SYSTEM WILL IMPACT THE AREA LATE TONIGHT
THROUGH SATURDAY WITH A COLD FRONT PASSAGE...BRINGING SHOWERS AND
MUCH COOLER TEMPERATURES. A SECOND STORM SYSTEM WILL REACH THE
AREA EARLY NEXT WEEK...FOLLOWED BY ANOTHER LATER IN THE WEEK.


&&

.DISCUSSION...COLD FRONT ACCELERATING INTO NORTHWEST UTAH THIS
EVENING DUE TO PRESSURE RISES OVER NORTH CENTRAL AND NORTHEAST
NEVADA FROM RAIN EVAPORATING AND COOLING THE AIR. TEMPERATURES
ARE NOW IN THE 40S THERE VS 70S IN UTAH. THIS THERMAL CONTRAST IS
CAUSING A GOOD PRESSURE GRADIENT AND THUS PUSHING THE COLD FRONT
INTO UTAH. MODELS SHOW THAT THIS FRONT DISSIPATES OVER THE GREAT
SALT LAKE BEFORE BEING REJUVENATED AND PUSHED INTO THE WASATCH
FRONT LATE MORNING.

IN THE MEANTIME HAVE ENDED THE WIND ADVISORY ACROSS MOST WESTERN
VALLEYS AS THE WINDS HAVE BEEN DECREASING AFTER SUNSET THIS
EVENING. HOWEVER...FARTHER NORTH OVER THE GREAT SALT LAKE DESERT
HIGH BASED SHOWERS...VIRGA...ARE CAUSING MICROBURST WINDS IN
EXCESS OF 58 MPH IN SEVERAL LOCATIONS AND THIS SHOULD CONTINUE
MOST OF TONIGHT AS WINDS ALOFT REMAIN STRONG AND THE AIR MASS
REMAINS UNSTABLE.

AFTER THE COLD FRONT MOVES TOWARDS THE WASATCH FRONT SATURDAY
MORNING THE SURFACE GRADIENT AND STRONG NORTHWEST WINDS ALOFT
SHOULD COMBINE TO CREATE SOME STRONG DOWNSLOPING WINDS ACROSS THE
NORTHWEST DESERT. HAVE BEEFED UP THE WINDS SOME FOR SATURDAY
MORNING TOWARDS LOW END ADVISORY BUT WILL LET THE MID CREW
DETERMINE IF AN ADVISORY OR POSSIBLY A WARNING NEEDS TO BE ISSUED.

JUST A LOOK AT THE TIMEHEIGHTS FOR SLC TOMORROW AFTERNOON AND IT
LOOKS LIKE WE COULD HAVE A SOAKING RAIN OVER NORTHERN UTAH DUE TO
DEEP MOISTURE AND GREAT DYNAMICS WITH THE NEGATIVELY TILTED
SYSTEM. FARTHER SOUTH ACROSS SOUTHERN UTAH THEY WILL CONTINUE TO
BE BREEZY BUT LOOKS LIKE THEY WILL LARGELY BE MISSED BY THE
PRECIPITATION...OTHER THAN A FEW MOUNTAIN SHOWERS.

&&

.AVIATION...THE SLC TERMINAL WILL SEE SOUTHERLY WINDS WHICH WILL
BE GUSTY AT TIMES UNTIL THE PASSAGE OF A COLD FRONT SHIFTS WINDS
TO THE NORTHWEST BETWEEN 15Z AND 17Z...BUT THERE IS A 30 PERCENT
CHANCE IT WILL OCCUR LATER. CIGS ARE EXPECTED TO DROP TO OR BELOW
6000 FT WITH SHOWERS IN THE VICINITY OF THE TERMINAL BETWEEN 13Z
AND1 15Z...BUT THERE IS A 30 PERCENT CHANCE THAT SHOWERS WILL MOVE
IN LATER THAN EXPECTED.

&&

.SLC WATCHES/WARNINGS/ADVISORIES...
UT...HIGH WIND WARNING UNTIL 6 AM MDT SATURDAY FOR UTZ005.

WY...NONE.
&&

$$

PUBLIC...STRUTHWOLF
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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