Severe Thunderstorm Warning 47, NWS Salt Lake City, UT

000 
WWUS55 KSLC 162322
SVSSLC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
521 PM MDT SAT AUG 16 2008

UTC053-162345-
/O.CON.KSLC.SV.W.0047.000000T0000Z-080816T2345Z/
WASHINGTON UT-
521 PM MDT SAT AUG 16 2008

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM MDT
FOR SOUTHWESTERN WASHINGTON COUNTY...

AT 516 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING PING PONG SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS 
LOCATED OVER SOUTHWESTERN WASHINGTON COUNTY...OR ABOUT 16 MILES WEST 
OF ST GEORGE...MOVING SOUTHEAST AT 25 MPH.

LAT...LON 3701 11403 3711 11400 3719 11391 3710 11378
      3710 11376 3703 11365 3701 11367
TIME...MOT...LOC 2321Z 323DEG 22KT 3701 11385

$$

LC

000 
WWUS55 KSLC 162339
SVSSLC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
538 PM MDT SAT AUG 16 2008

UTC053-162348-
/O.EXP.KSLC.SV.W.0047.000000T0000Z-080816T2345Z/
WASHINGTON UT-
538 PM MDT SAT AUG 16 2008

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN WASHINGTON COUNTY
EXPIRES AT 545 PM MDT...

THE STORM HAS EXITED THE WARNED AREA. THEREFORE THE WARNING HAS
BEEN ALLOWED TO EXPIRE.

LAT...LON 3701 11403 3711 11400 3719 11391 3710 11378
      3710 11376 3703 11365 3701 11367
TIME...MOT...LOC 2338Z 323DEG 22KT 3693 11377

$$

LC

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
440 PM MDT SAT AUG 16 2008

.SYNOPSIS...A COOL NORTHERLY FLOW WILL PERSIST OVER THE AREA TONIGHT
THEN WEAKEN SUNDAY AS HIGH PRESSURE BUILDS. THE HIGH WILL SHIFT EAST
MONDAY WITH AN INCREASING SOUTHWESTERLY FLOW INTO MID WEEK.

&&

.DISCUSSION...LOW LEVEL MOISTURE CONVERGENCE INTO THE SURFACE TROF
ACROSS SRN UT HAS NOT ENDED THIS AFTERNOON AND CONVECTION HAS
REDEVELOPED THIS AFTERNOON. SOME OF THIS APPEARS TO BE PRODUCING
HEAVY RAIN AND CELLS HAVE BEEN TRAINING DOWN DRAINAGES RESULTING IN
A HEIGHTENED POTENTIAL OF FLASH FLOODING. THERE IS ALSO SUFFICIENT
VERTICAL SHEAR TO SET OFF ISOLATED STRONG STORMS.

MODELS INDICATE THE UPPER SUPPORT AND THE SURFACE CONVERGENCE WILL
WEAKEN OVERNIGHT AND CELLS SHOULD END AFTER MIDNIGHT.

THERE WILL CONTINUE TO BE WEAK SUPPORT FOR EAST WINDS ACROSS
NORTHERN UT TONIGHT INTO SUN SO EXPECT ENHANCED DRAINAGE WINDS OUT
OF THE CANYONS AGAIN TONIGHT BUT NOT AS STRONG AS LAST NIGHT.

THE UPSTREAM RIDGE MOVES OVER THE AREA SUN AND THE AIRMASS WARMS AND
DRIES OVER THE SOUTHEAST. LIMITED MOISTURE IS FORECAST TO LINGER
OVER THE SOUTHWEST WITH THE REMAINS OF THE SURFACE TROF KEEPING A
THREAT OF ISOLATED CONVECTION GOING IN THAT AREA. THE MOISTURE
STARTS TO INCREASE NORTHWARD MON AS THE RIDGE SHIFTS EAST BUT
PROBABLY ONLY ENOUGH FOR HIGH BASED CONVECTION ANYWHERE OUTSIDE OF
FAR SWRN UT.

SOUTHWEST WINDS INCREASE TOWARDS MID WEEK AS A FAIRLY DEEP TROF IN
THE GULF OF ALASKA STARTS TO MOVE INTO THE PACNW STATES. THIS ALSO
IS FORECAST TO DRY THE AREA OUT. THE TROF RIDES THRU THE NRN ROCKIES
WED/THU AND PUSHES A COLD FRONT INTO NRN UT LATE THU. MODELS HAVE
COME MORE INTO AGREEMENT ON TIMING AND AMPLITUDE OF THIS TROF FOR
OUR FORECAST AREA AND HAVE TRENDED GRIDS THAT WAY.

&&

.AVIATION...WINDS AT THE SLC TERMINAL WILL PREVAIL FROM THE WEST TO
NORTHWEST THROUGH THE REST OF THE DAY TODAY...THEN EXPECT TYPICAL
SOUTHEAST DRAINAGE WINDS TONIGHT AFTER 03-04Z. OTHERWISE...VFR
CONDITIONS WILL PREVAIL.

&&

.FIRE WEATHER...A STORM SYSTEM OVER WESTERN COLORADO WILL SLOWLY
MOVE EAST AND AWAY FROM THE REGION TONIGHT THROUGH SUNDAY. HIGH
PRESSURE BUILDING ACROSS THE REGION IN THE WAKE OF THIS SYSTEM WILL
ALLOW FOR A WARMING TREND SUNDAY THROUGH MONDAY. INCREASING
SOUTHWESTERLY FLOW ALOFT IS EXPECTED TO DEVELOP ACROSS THE AREA
DURING THE MID-WEEK PERIOD. THIS MAY RESULT IN BREEZY TO WINDY
CONDITIONS ACROSS THE WESTERN VALLEYS OF UTAH AS EARLY AS
TUESDAY...AND CONTINUING INTO WEDNESDAY. THIS COMBINED WITH LOW
RELATIVE HUMIDITY MAY ALLOW FOR CRITICAL FIRE WEATHER CONDITIONS
BOTH DAYS ACROSS WESTERN UTAH. ADDITIONALLY...HIGH BASED MOISTURE IS
EXPECTED TO INCREASE ACROSS THE DISTRICT MONDAY AND TUESDAY...WHICH
MAY ALLOW FOR AFTERNOON AND EVENING DRY THUNDERSTORMS.

&&

.SLC WATCHES/WARNINGS/ADVISORIES...
UT...WIND ADVISORY UNTIL 6 AM SATURDAY FOR UTZ001-UTZ002.

WY...NONE.

&&

WILENSKY/CHENG/SEAMAN

FOR MORE INFORMATION FROM NOAA/S NATIONAL WEATHER SERVICE VISIT...
HTTP://WEATHER.GOV/SALTLAKECITY (ALL LOWER CASE)