Severe Thunderstorm Warning 28, NWS Salt Lake City, UT

512 
WWUS55 KSLC 202247
SVSSLC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
447 PM MDT WED AUG 20 2014

UTC045-202300-
/O.CON.KSLC.SV.W.0028.000000T0000Z-140820T2300Z/
TOOELE UT-
447 PM MDT WED AUG 20 2014

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM MDT
FOR EAST CENTRAL TOOELE COUNTY...

AT 443 PM MDT...DOPPLER RADAR CONTINUES TO INDICATE A SEVERE 
THUNDERSTORM PRODUCING QUARTER SIZE HAIL. THIS STORM WAS LOCATED 
JUST NORTH OF TOOELE...MOVING SOUTHEAST AT 5 MPH.

LOCATIONS IMPACTED INCLUDE...
TOOELE...GRANTSVILLE...STANSBURY PARK...ERDA AND LAKE POINT. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN THE PATH OF THIS STORM...PREPARE IMMEDIATELY FOR LARGE
HAIL AND DEADLY CLOUD TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE
TO A SHELTER...PREFERABLY INSIDE A STRONG BUILDING AND AWAY FROM
WINDOWS.

&&

LAT...LON 4058 11243 4070 11228 4059 11218 4049 11220
      4045 11226
TIME...MOT...LOC 2243Z 315DEG 10KT 4056 11226 

$$

LC

152 
WWUS55 KSLC 202257
SVSSLC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
457 PM MDT WED AUG 20 2014

UTC045-202306-
/O.EXP.KSLC.SV.W.0028.000000T0000Z-140820T2300Z/
TOOELE UT-
457 PM MDT WED AUG 20 2014

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL TOOELE COUNTY
WILL EXPIRE AT 500 PM MDT...
                
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE 
LIMITS...AND NO LONGER POSES A THREAT OF LARGE HAIL. THEREFORE THE 
WARNING WILL BE ALLOWED TO EXPIRE. HOWEVER HEAVY RAIN IS STILL 
POSSIBLE WITH THIS THUNDERSTORM.

LAT...LON 4058 11243 4070 11228 4059 11218 4049 11220
      4045 11226
TIME...MOT...LOC 2253Z 315DEG 10KT 4056 11226 

$$

LC

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
431 PM MDT WED AUG 20 2014

.SYNOPSIS...THE AIRMASS OVER THE FORECAST AREA WILL SLOWLY DRY
THROUGH FRIDAY...ALTHOUGH CONDITIONS WILL REMAIN UNSETTLED. A
COLD TROUGH WILL MOVE ACROSS NORTHERN UTAH OVER THE WEEKEND
BRINGING COOLER CONDITIONS AND A WET START TO THE WEEKEND.

&&

.DISCUSSION...UPPER LEVEL TROUGH OVER THE NRN INTERMOUNTAIN REGION
THIS AFTERNOON WITH CUTOFF LOW ALONG THE SRN CALIFORNIA COAST.
MOIST AIRMASS REMAINS IN PLACE OVER UTAH THIS AFTERNOON WITH GOES
SOUNDER PRECIPITABLE WATER VALUES STILL HOVERING BETWEEN .75" AND
1" OVER MOST OF THE STATE. SBCAPE VALUES IN EXCESS OF 1000 J/KG
THIS AND SCATTERED CONVECTION HAS DEVELOPED ACROSS THE STATE.
DEEP LAYER SHEAR MAXED OUT IN EAST CENTRAL UTAH EARLY THIS
AFTERNOON AND IS NOW DECREASING. MEANWHILE SHEAR HAS INCREASED
ACROSS FAR NORTHWEST UTAH TO 25-30 KTS AHEAD OF APPROACHING
SHORTWAVE. GIVEN INSTABILITY THAT IS PRESENT AND INCREASING
SHEAR...POTENTIAL FOR STRONG STORMS WILL CONTINUE INTO THE
EVENING HOURS....ESPECIALLY ACROSS THE NORTHWEST PORTION OF THE
STATE. ANTICIPATE THAT CONVECTION WILL DIMINISH QUICKLY ACROSS THE
SOUTH THIS EVENING. HOWEVER...IN THE NORTH CONVECTION WILL LIKELY
CONTINUE WELL INTO THE NIGHT. NAM INDICATES THAT MID LEVEL
SHORTWAVE IN NE NV AND SRN ID THIS AFTERNOON WILL MOVE ACROSS
NORTHERN UTAH TONIGHT. THIS WILL PROVIDE SUFFICIENT FORCING TO
KEEP NOCTURNAL SHOWERS AND STORMS GOING AND HRRR MODEL HAS BEEN
CONSISTENT IN SHOWING THIS ACROSS MULTIPLE MODELS RUNS.
ACCORDINGLY...HAVE INCREASED POPS AND CLOUD COVER ACROSS NRN UTAH
OVERNIGHT.

THURSDAY AND THURSDAY NIGHT...TROUGH OVER THE PACIFIC NORTHWEST
BEGINS TO DEEPEN AND CUTOFF LOW BECOMES AN OPEN WAVE AND MOVES
EAST THROUGH ARIZONA. IN BETWEEN THESE TWO FEATURES...MODEL
GUIDANCE CONTINUES TO SHOW DRYING TREND OVER UTAH.
HOWEVER...MODELS HAVE BEEN CONSISTENTLY OVERZEALOUS WITH THE
DRYING TREND OVER UTAH. BELIEVE SUFFICIENT MOISTURE WILL REMAIN IN PLACE
ON THURSDAY TO ONCE AGAIN SEE SCATTERED MTN CONVECTION WITH
ISOLATED STORMS OVER VALLEY LOCATIONS. COVERAGE OF VALLEY STORMS
MAY BE A LITTLE GREATER NEAR THE IDAHO BORDER AS MID LEVEL
BAROCLINIC ZONE PROVIDES CONVERGENCE ALONG AN AXIS FROM NE NV
INTO SRN ID.

ATTENTION THEN TURNS TOWARD DEEPENING TROUGH IN THE PACIFIC NW.
ON FRIDAY...STRONG JET CORE ON UPSTREAM SIDE OF TROUGH INDICATING
THAT TROUGH IS STILL DIGGING A BIT. 90 KT CORE THEN ROUNDS THE
BASE OF THE TROUGH FRI NIGHT. AS A RESULT OF THE STRONG AND
COMPACT CYCLONIC CURVATURE ASSOCIATED WITH THE TROUGH THE FLOW AT
THE BASE OF THE TROUGH HIGHLY SUB-GEOSTROPHIC. THIS LEADS TO A
AREA OF UPPER LEVEL DIVERGENCE OVER NRN UT FRI NIGHT INTO SAT.
BENEATH THIS AREA OF UPPER LEVEL DIVERGENCE MODELS DEPICT
CONVERGENCE ALG 700 MB BAROCLINIC ZONE AS IT MOVES INTO NRN UT FRI
NIGHT. THUS ANTICIPATE THAT BAROCLINIC ZONE WILL BE QUITE ACTIVE
FRI NIGHT INTO SATURDAY AND HAVE INCREASED POPS QUITE A BIT
ACROSS NRN UT DURING THIS PERIOD.

700 MB TEMPERATURES DROP TO 4-6C ACROSS NRN UT AND 7-10C ACROSS
SRN UT FOR SAT AND AND SUN. THIS WILL BRING MUCH COOLER
TEMPERATURES TO THE STATE AND MAX TEMPS ON SAT AND SUN WILL BE
AROUND 10 DEGREES F BELOW NORMAL IN MANY AREAS.

BAROCLINIC ZONE STALLS OUT IN CENTRAL UT SAT NIGHT AND SUN BEFORE
LIFTING BACK NORTH ON MONDAY. THIS ALLOWS TEMPERATURES TO REBOUND
A BIT FOR THE START OF THE WEEK. ANOTHER SHORTWAVE WILL THEN DROP
DOWN THE BACKSIDE OF THE NRN INTERMOUNTAIN REGION TROUGH AND DRIVE
THE BAROCLINIC ZONE BACK TROUGH UT MON NIGHT AND TUESDAY. SOME
UNCERTAINTY ON HOW ACTIVE THE BOUNDARY WILL BE...BUT WITH THE
POTENTIAL FOR RESIDUAL MOISTURE TO STILL BE IN PLACE...AND THE
STRENGTH OF THE WAVE...HAVE INCREASED POPS ACROSS THE STATE
DURING THIS PERIOD.

&&

.AVIATION....ELEVATED SOUTH WINDS WILL PREVAIL AT THE SLC
TERMINAL INTO THE EARLY EVENING...ALTHOUGH THERE IS A 10 PERCENT
CHANCE OF WINDS BRIEFLY SHIFTING TO THE NORTHWEST BETWEEN
2300-0100 UTC. GUSTY AND ERRATIC OUTFLOW WINDS ARE POSSIBLE WITH
VICINITY SHOWERS THROUGH THE EVENING HOURS. TYPICAL SOUTHEAST
DRAINAGE FLOW SHOULD RESUME BETWEEN 0300-0500 UTC.

&&

.FIRE WEATHER...ACTIVE WEATHER WILL CONTINUE INTO THIS WEEKEND BEFORE
BRIEFLY DRYING ON SATURDAY NIGHT/SUNDAY. RESIDUAL MOISTURE IN PLACE
WILL RETAIN ELEVATED RH FOR THE NEXT FEW DAYS ALLOWING ISOLATED
VALLEY AND SCATTERED MOUNTAIN SHOWERS AND STORMS THROUGH FRIDAY. AN
APPROACHING COLD FRONT DRIVEN BY A STRONG PACIFIC TROUGH WILL RAMP
SOUTHERLY WINDS ACROSS THE WEST DESERTS FRIDAY AFTERNOON BUT FORECAST
RH REMAINS AT OR ABOVE 20 PERCENT AND BULK OF FUELS REMAIN NON CRITICAL.
THE COLD FRONT WILL MOVE NORTH TO SOUTH THROUGH THE AREA LATE FRIDAY
NIGHT THROUGH SATURDAY SPREADING FAIRLY WIDESPREAD WETTING RAINS
ACROSS THE NORTHERN HALF OF THE DISTRICT AT THAT TIME. BRIEF DRYING
IS EXPECTED FOR SUNDAY BUT ANOTHER PACIFIC TROUGH/COLD FRONT IS
EXPECTED MONDAY INTO TUESDAY.

&&

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

PUBLIC...GRAHAM
FIRE WEATHER...MERRILL
AVIATION...GRAHAM

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)

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
443 AM MDT WED AUG 20 2014

UTZ001>016-019>021-517-518-WYZ021-211045-
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-
443 AM MDT WED AUG 20 2014

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

.DAY ONE...TODAY AND TONIGHT

SHOWERS AND THUNDERSTORMS WILL CONTINUE TO IMPACT PARTS OF
NORTHERN UTAH THIS MORNING. SCATTERED SHOWERS AND THUNDERSTORMS
WILL DEVELOP AGAIN THIS AFTERNOON. THE STORMS WILL BE MOST
WIDESPREAD OVER THE HIGHER TERRAIN BUT COULD DRIFT INTO ADJACENT
VALLEYS.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

AN UNSTABLE AIRMASS WILL REMAIN OVER THE OUTLOOK AREA THURSDAY AND
FRIDAY...RESULTING IN A CONTINUED THREAT OF SHOWERS AND
THUNDERSTORMS. AN UNSEASONABLY COOL PACIFIC NORTHWEST TROUGH IS
EXPECTED TO PUSH A COLD FRONT THROUGH NORTHERN UTAH FRIDAY NIGHT
AND SATURDAY. SHOWERS AND THUNDERSTORMS WILL DEVELOP AS THE TROUGH
MOVES THROUGH THE AREA. A BRIEF DRYING AND WARMING TREND IS
EXPECTED SUNDAY AND MONDAY BEFORE ANOTHER TROUGH MOVES INTO
NORTHERN UTAH MONDAY NIGHT AND TUESDAY.

.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)

FOR INFORMATION ON POTENTIAL ROAD TRAVEL IMPACTS VISIT...
HTTP://WWW.UDOTTRAFFIC.UTAH.GOV/ROADWEATHERFORECAST.ASPX

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
1207 PM MDT WED AUG 20 2014

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0430 AM     FLASH FLOOD      WEST JORDAN             40.60N 112.00W
08/20/2014                   SALT LAKE          UT   EMERGENCY MNGR

            HEAVY RAIN OVERWHELMED STORM DRAINS FLOODING THE
            BASEMENTS OF 17 HOMES.

&&

GM

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
219 PM MDT WED AUG 20 2014

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0210 PM     FLASH FLOOD      8 SE PANGUITCH          37.74N 112.33W
08/20/2014                   GARFIELD           UT   PARK/FOREST SRVC

            FOREST SERVICE REPORTS RED CANYON AND BUTCH CASSIDY WASH
            ARE FLASH FLOODING.

&&

CRK

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
319 PM MDT WED AUG 20 2014

UTZ003-202200-
SALT LAKE AND TOOELE VALLEYS UT-
319 PM MDT WED AUG 20 2014

...SIGNIFICANT WEATHER ADVISORY FOR WESTERN SALT LAKE AND EAST
CENTRAL TOOELE COUNTIES UNTIL 400 PM MDT...

AT 317 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM NEAR GRANTSVILLE...MOVING NORTHEAST AT 5 MPH.

PENNY TO NICKEL SIZE HAIL AND WINDS OF 40 TO 55 MPH WILL BE
POSSIBLE.  HEAVY RAINFALL IS ALSO OCCURRING.

LOCATIONS IMPACTED INCLUDE... GRANTSVILLE...STANSBURY PARK...ERDA
AND LAKE POINT. THIS ADVISORY INCLUDES INTERSTATE 80 FROM
GRANTSVILLE TO LAKE POINT.  HEAVY RAINFALL MAY CAUSE PONDING ON AREA
ROADS INCLUDING INTERSTATE 80.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF THREATENING WEATHER APPROACHES...TAKE SHELTER IN A STURDY
BUILDING.

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD
TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

&&

LAT...LON 4077 11247 4077 11226 4071 11217 4070 11219
      4071 11220 4070 11224 4066 11223 4055 11238
      4066 11257
TIME...MOT...LOC 2117Z 223DEG 5KT 4066 11242

CRK

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
327 PM MDT WED AUG 20 2014

UTZ013-202215-
SAN RAFAEL SWELL UT-
327 PM MDT WED AUG 20 2014

...SIGNIFICANT WEATHER ADVISORY FOR EASTERN WAYNE...SOUTHEASTERN
EMERY AND NORTHEASTERN GARFIELD COUNTIES UNTIL 415 PM MDT...

AT 325 PM MDT...AN AUTOMATED WEATHER STATION REPORTED A STRONG
THUNDERSTORM NEAR HANKSVILLE...MOVING EAST AT 15 MPH. ADDITIONAL
STRONG THUNDERSTORMS ARE LOCATED NORTH OF HANKSVILLE NEAR GOBLIN
VALLEY STATE PARK.

PENNY TO NICKEL SIZE HAIL AND WINDS OF 40 TO 55 MPH WILL BE POSSIBLE.

LOCATIONS IMPACTED INCLUDE...
HANKSVILLE AND GOBLIN VALLEY.

AN AUTOMATED WEATHER STATION IN HANKSVILLE REPORTED A WIND GUST TO
56 MPH WITH THIS STORM.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF THREATENING WEATHER APPROACHES...TAKE SHELTER IN A STURDY
BUILDING.

STRONG WINDS WITH THESE STORMS MAY OCCUR WELL AHEAD OF ANY RAIN OR
LIGHTNING. DO NOT WAIT FOR THE SOUND OF THUNDER BEFORE TAKING COVER.
SEEK SHELTER IMMEDIATELY INSIDE A STURDY STRUCTURE AND STAY AWAY FROM
WINDOWS.

&&

LAT...LON 3812 11040 3835 11078 3890 11055 3891 11018
      3889 11016 3886 11017 3886 11013 3884 11015
      3881 11011
TIME...MOT...LOC 2125Z 256DEG 14KT 3839 11061

CRK

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
334 PM MDT WED AUG 20 2014

UTZ005-202230-
GREAT SALT LAKE DESERT AND MOUNTAINS UT-
334 PM MDT WED AUG 20 2014

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN TOOELE COUNTY UNTIL
430 PM MDT...

AT 331 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED AN
AREA OF STRONG THUNDERSTORMS 27 MILES SOUTHEAST OF WENDOVER...MOVING
NORTHEAST AT 20 MPH.

PEA SIZE HAIL AND WINDS OF 40 TO 55 MPH WILL BE POSSIBLE.

LOCATIONS IMPACTED INCLUDE... KNOLLS...CLIVE AND INTERSTATE 80
ACROSS WESTERN AND CENTRAL TOOELE COUNTY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF THREATENING WEATHER APPROACHES...TAKE SHELTER IN A STURDY
BUILDING.

STRONG WINDS WITH THESE STORMS MAY OCCUR WELL AHEAD OF ANY RAIN OR
LIGHTNING. DO NOT WAIT FOR THE SOUND OF THUNDER BEFORE TAKING COVER.
SEEK SHELTER IMMEDIATELY INSIDE A STURDY STRUCTURE AND STAY AWAY FROM
WINDOWS.

&&

LAT...LON 4014 11382 4062 11404 4094 11333 4075 11301
      4029 11294
TIME...MOT...LOC 2131Z 237DEG 15KT 4042 11373

LC

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
350 PM MDT WED AUG 20 2014

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0330 PM     HAIL             GRANTSVILLE             40.59N 112.47W
08/20/2014  M0.88 INCH       TOOELE             UT   PUBLIC

            PUBLIC REPORTED NICKEL SIZED HAIL.

&&

CRK