Severe Thunderstorm Warning 34, NWS Salt Lake City, UT

000 
WWUS55 KSLC 182107
SVSSLC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
304 PM MDT SAT AUG 18 2007

UTC003-182130-
/O.CON.KSLC.SV.W.0034.000000T0000Z-070818T2130Z/
BOX ELDER UT-
304 PM MDT SAT AUG 18 2007

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM MDT
FOR CENTRAL BOX ELDER COUNTY...

AT 305 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN
EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 7 MILES SOUTHEAST OF PARK 
VALLEY...OR ABOUT 30 MILES SOUTHWEST OF SNOWVILLE...MOVING NORTHEAST 
AT 30 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  MATLIN MOUNTAINS AT 310 PM MDT
  BAKER HILLS AT 320 PM MDT 

THIS STORM IS CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60
MPH. SEEK SHELTER IN A STURDY STRUCTURE UNTIL THE STORM HAS PASSED.

LAT...LON 4163 11376 4146 11363 4162 11287 4195 11325

$$

RG

000 
WWUS55 KSLC 182132
SVSSLC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
332 PM MDT SAT AUG 18 2007

UTC003-182142-
/O.EXP.KSLC.SV.W.0034.000000T0000Z-070818T2130Z/
BOX ELDER UT-
332 PM MDT SAT AUG 18 2007

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL BOX ELDER COUNTY
EXPIRES AT 330 PM MDT...

THE STORM HAS WEAKENED AND IS NO LONGER SEVERE. THEREFORE THE WARNING
HAS BEEN ALLOWED TO EXPIRE.

LAT...LON 4163 11376 4146 11363 4162 11287 4195 11325

$$

RG

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
1010 AM MDT SAT AUG 18 2007

.SYNOPSIS...AN UPPER TROUGH ALONG THE WEST COAST WILL MOVE SLOWLY
THROUGH THE PACIFIC NORTHWEST AND NORTHERN ROCKIES OVER THE WEEKEND.
THIS WILL BRING AN INCREASING SOUTHWEST FLOW TO UTAH AND A DRYING
TREND STARTING ON SUNDAY.

&&

.DISCUSSION...AN AREA OF SHOWERS AND ISOLATED THUNDERSTORMS
CONTINUES OVER PORTIONS OF NORTHERN AND CENTRAL UTAH THIS MORNING.
THIS AREA OF CONVECTION AND ENHANCED CLOUD COVER HAS DEVELOPED AHEAD
OF A SHORTWAVE MOVING NORTHEASTWARD ACROSS CENTRAL UTAH AT THIS
TIME. 06Z AND 12Z GFS WERE MORE PROGRESSIVE WITH THIS
FEATURE...BRINGING THE SHORTWAVE ACROSS SOUTHWESTERN WYOMING BY
18Z. NAM IS SLOWER AND MORE REALISTIC BASED ON CURRENT
SATELLITE...BRINGING THE SHORTWAVE ACROSS THE SAME AREA BY 00Z.
CURRENT GRIDS LEAN TOWARDS THE NAM SOLUTION. NO UPDATES REQUIRED
AT THIS TIME.

EXPECT ANOTHER DAY OF SCATTERED SHOWERS AND THUNDERSTORMS ACROSS
MUCH OF THE REGION. SPC MESOANALYSIS PAGE INDICATES 30KT 0-6 KM
SHEAR ACROSS THE NORTHWEST CORNER UTAH TODAY. THIS IS A BIT
FURTHER SOUTH AND EAST THAN YESTERDAY. WILL HAVE TO MONITOR
NORTHWEST UTAH AGAIN TODAY FOR ANY STRONGER STORMS.

PRECIPITABLE WATER VALUES ARE NEAR OR IN EXCESS OF 1 INCH ACROSS
MUCH OF THE REGION. WITH SUFFICIENT DEEP MOISTURE AND
INSTABILITY...WILL ALSO HAVE TO MONITOR FLASH FLOOD THREAT AGAIN
TODAY...ESPECIALLY FOR THE SOUTHERN HALF OF UTAH. CONVECTION MAY
BE SUPPRESSED UNTIL LATER THIS AFTERNOON IN AREAS THAT REMAIN
UNDERNEATH CLOUD COVER...PRIMARLY THE NORTHERN WASATCH MOUNTAINS
AND UINTAS.

DRIER CONDITIONS ARE EXPECTED SUNDAY AS THE TROUGH OFFSHORE THE
WEST COAST THIS MORNING MOVES ACROSS THE NORTHERN ROCKIES. THIS WILL
BRING AN INCREASED SOUTHWESTERLY FLOW FOR MUCH OF THE DAY SUNDAY.
WHILE THIS DRY FLOW WILL RAPIDLY DEPLETE THE MOISTURE IN THE LOWER
LEVELS OF THE ATMOSPHERE...THERE WILL BE ENOUGH MOISTURE IN THE
MID LEVELS FOR AT LEAST ISOLATED CONVECTIVE DEVELOPMENT SUNDAY.
THIS WILL BE MAINLY TIED TO THE TERRAIN. HOWEVER...WITH THE DRYING
IN THE SUB-CLOUD LAYER AND SIGNIFICANTLY LOWER PRECIPITABLE WATER
VALUES...EXPECT GUSTY WINDS AND DRY THUNDERSTORMS TO BE THE MAIN
ISSUE SUNDAY. SEE THE FIRE WEATHER DISCUSSION FOR DETAILS ON POSSIBLE
HEADLINES FOR TOMORROW.

FOLLOWING THE TROUGH...COOLER TEMPERATURES ARE EXPECTED MONDAY
ACROSS THE NORTHERN HALF UTAH AND EXTREME SOUTHWESTERN WYOMING.
WELL ABOVE NORMAL TEMPERATURES AND MUCH DRIER CONDITIONS WILL
RETURN TO THE EASTERN GREAT BASIN BY MIDWEEK.

&&

.AVIATION...INCREASING SOUTHERLY WINDS CAN BE EXPECTED AT THE SLC
TERMINAL THROUGH THIS EVENING. LAKE BREEZE IS NOT LIKELY TODAY...BUT
SHORT LIVED GUSTY WINDS OUT OF THE WEST OR NORTHWEST ARE POSSIBLE
NEAR THUNDERSTORMS THIS AFTERNOON AND EVENING.

&&

.FIRE WEATHER...UPPER TROUGH MOVING INTO THE PACIFIC NORTHWEST THIS
MORNING WILL CONTINUE EASTWARD THROUGH SUNDAY AND RESULT IN
INCREASED SOUTHWESTERLY FLOW OVER THE FIRE DISTRICT. WINDS WILL BE
GUSTY ACROSS MOST OF THE FIRE DISTRICT...BUT ESPECIALLY OVER THE
WESTERN VALLEYS AND NORTH CENTRAL UTAH. HUMIDITIES ARE EXPECTED TO
REMAIN ABOVE RED FLAG CRITERIA TODAY AS AMPLE MOISTURE REMAINS OVER
THE AREA. WETTING RAINS ARE ALSO EXPECTED WITH THE ONSET OF
AFTERNOON AND EVENING THUNDERSTORMS. THE AIRMASS WILL THEN BEGIN TO
DRY ON SUNDAY AND HUMIDITIES WILL APPROACH RED FLAG CRITERIA OVER
NORTHWEST UTAH. CONTACTED EGBCC AND DISCUSSED FUEL MOISTURE AND THEY
SAID THAT ANYWHERE OVER NORTHWEST UTAH INCLUDING THE WASATCH FRONT
REMAINS CRITICAL. WILL HOLD OFF ON ANY FIRE WEATHER HEADLINES UNTIL
THIS AFTERNOON WHEN NEW GUIDANCE HAS BEEN RECEIVED AND PERUSED
COMPLETELY. WINDS DECREASE MONDAY WITH A DRY AIRMASS IN PLACE
THROUGH THE WEEK AS WEAK WESTERLY FLOW DOMINATES.

&&

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

&&

PUBLIC...CSMITH
FIRE WEATHER/AVIATION...YOUNG

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

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
550 AM MDT SAT AUG 18 2007

UTZ001>016-019>021-517-518-WYZ021-190600-
CACHE VALLEY/UTAH PORTION-NORTHERN WASATCH FRONT-
SALT LAKE AND TOOELE VALLEYS-SOUTHERN WASATCH FRONT-
GREAT SALT LAKE DESERT AND MOUNTAINS-WASATCH MOUNTAIN VALLEYS-
WASATCH MOUNTAINS I-80 NORTH-WASATCH MOUNTAINS SOUTH OF I-80-
WESTERN UINTA MOUNTAINS-WASATCH PLATEAU/BOOK CLIFFS-
WESTERN UINTA BASIN-CASTLE COUNTRY-SAN RAFAEL SWELL-
SANPETE/SEVIER VALLEYS-WEST CENTRAL UTAH-SOUTHWEST UTAH-
UTAHS DIXIE AND ZION NATIONAL PARK-SOUTH CENTRAL UTAH-
GLEN CANYON RECREATION AREA/LAKE POWELL-CENTRAL MOUNTAINS-
SOUTHERN MOUNTAINS-SOUTHWEST WYOMING-
550 AM MDT SAT AUG 18 2007

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE WESTERN TWO THIRDS OF
UTAH AND EXTREME SOUTHWEST WYOMING.

.DAY ONE...TODAY AND TONIGHT

SCATTERED SHOWERS AND THUNDERSTORMS WILL DEVELOP AGAIN TODAY OVER
PRETTY MUCH THE ENTIRE AREA. A FEW OF THE STORMS OVER NORTHERN UTAH
THIS AFTERNOON COULD BE STRONG. STORMS COULD ALSO PRODUCE HEAVY
RAINFALL AND ISOLATED INCIDENTS OF FLASH FLOODING ARE POSSIBLE...
ESPECIALLY OVER THE HIGHER TERRAIN OF CENTRAL AND NORTHEAST UTAH.
THUNDERSTORMS WILL CONTINUE INTO TONIGHT OVER NORTHERN UTAH AND
SOUTHWEST WYOMING.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

THERE WILL STILL BE A CHANCE OF SHOWERS AND THUNDERSTORMS OVER
NORTHERN AND EASTERN SECTIONS OF THE OUTLOOK AREA ON SUNDAY. VERY
STRONG WINDS COULD ACCOMPANY A FEW OF THE STORMS OVER THE NORTH
SUNDAY EVENING. DRY WEATHER IS EXPECTED TO SPREAD INTO THE AREA
MONDAY AND PREVAIL THROUGH THE REMAINDER OF THE PERIOD.

.SPOTTER INFORMATION STATEMENT...

WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.

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