Severe Thunderstorm Warning 78, NWS Salt Lake City, UT

684 
WWUS55 KSLC 210048
SVSSLC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
648 PM MDT SAT AUG 20 2011

UTC011-035-210115-
/O.CON.KSLC.SV.W.0078.000000T0000Z-110821T0115Z/
SALT LAKE UT-DAVIS UT-
648 PM MDT SAT AUG 20 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM MDT
FOR SOUTHEASTERN DAVIS AND EASTERN SALT LAKE COUNTIES...

AT 645 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS 
LOCATED NEAR HOLLADAY AND MURRAY...MOVING NORTHEAST AT 25 MPH.

* LOCATIONS IN THE WARNING INCLUDE...
  SALT LAKE CITY... UNIVERSITY OF UTAH AND BOUNTIFUL

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4055 11185 4065 11205 4098 11180 4096 11178
      4092 11180 4085 11173 4087 11170 4085 11167
      4073 11162
TIME...MOT...LOC 0047Z 234DEG 22KT 4069 11182

$$

875 
WWUS55 KSLC 210100
SVSSLC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
700 PM MDT SAT AUG 20 2011

UTC011-035-210108-
/O.CAN.KSLC.SV.W.0078.000000T0000Z-110821T0115Z/
SALT LAKE UT-DAVIS UT-
700 PM MDT SAT AUG 20 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN DAVIS AND EASTERN
SALT LAKE COUNTIES IS CANCELLED...

THE STORM HAS WEAKENED AND IS NO LONGER SEVERE. THEREFORE THE WARNING
HAS BEEN CANCELLED. 

WIND GUSTS IN EXCESS OF 50 MPH WERE REPORTED WITH THIS STORM. PLEASE 
PASS ON REPORTS OF SEVERE WEATHER TO LOCAL LAW ENFORCEMENT.  

LAT...LON 4055 11185 4065 11205 4098 11180 4096 11178
      4092 11180 4085 11173 4087 11170 4085 11167
      4073 11162
TIME...MOT...LOC 0058Z 234DEG 22KT 4073 11175

$$

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
339 PM MDT SAT AUG 20 2011

.SYNOPSIS...HIGH PRESSURE ALOFT CENTERED NEAR THE FOUR CORNERS
CONTINUES TO EXPAND NORTHWARD AS A WEAK SYSTEM SITS OFF THE
CALIFORNIA COAST. MOISTURE WILL REMAIN PRIMARILY OVER THE SOUTHERN
AND EASTERN PORTIONS OF THE STATE EARLY IN THE WEEK.

&&

.DISCUSSION...HIGH PRESSURE ALOFT CURRENTLY CENTERED NEAR THE FOUR
CORNERS AREA WILL EXPAND NORTHWARD THIS WEEKEND. A WEAK SYSTEM
WILL REMAIN OFF THE NORTHERN CALIFORNIA COAST FOR THE NEXT FEW
DAYS. THIS SYSTEM WILL CONTINUE TO WEAKEN EARLY NEXT WEEK AND THEN
BE ABSORBED INTO THE FLOW AROUND THE STRONG PERSISTENT HIGH.

PLENTY OF SHOWERS AND THUNDERSTORMS HAVE DEVELOPED ACROSS SOUTHERN
UTAH THIS AFTERNOON AND A FLASH FLOOD WARNING IS IN EFFECT UNTIL
415 PM THIS AFTERNOON FOR THE AREA NORTH OF ESCALANTE. WITH
PERSISTENT STORM DEVELOPMENT IN THIS AREA...THERE IS ALSO A FLOOD
ADVISORY WHICH WILL REMAIN IN EFFECT THROUGH AT LEAST 545 PM.

THE INCREASING SOUTHERLY FLOW RESULTING FROM THE EXPANDING HIGH
PRESSURE WILL MAINTAIN AN INFLUX OF MOISTURE ACROSS SOUTHERN AND
EASTERN UTAH INTO EARLY NEXT WEEK. MUCH DRIER AIR WILL SEEP INTO
WESTERN AND NORTHERN UTAH DURING THE SAME TIME PERIOD. WIDELY
SCATTERED AFTERNOON AND EVENING CONVECTION IS ANTICIPATED IN THE
AREAS WITH THE BEST MOISTURE PROFILES INTO EARLY NEXT WEEK. BY
WEDNESDAY...THE AIRMASS WILL BECOME QUITE DRY WITH ONLY A SMALL
CHANCE FOR AFTERNOON AND EVENING THUNDERSTORMS OVER THE MOUNTAINS.

AS THE WEAK LOW OFF THE CALIFORNIA COAST GETS STRETCHED APART AND
MOVES THROUGH THE RIDGE...SHOULD SEE A SLIGHT COOLING TREND...BUT
ONLY LOWERING TEMPERATURES TO NEAR NORMAL VALUES. THEN EXPECT A
DEGREE OR TWO WARMING EACH DAY THROUGH THURSDAY. EXPECT SLIGHTLY
ABOVE NORMAL TEMPERATURES INTO THE WEEKEND.

ONLY POINT OF INTEREST IN THE LONG RANGE...OTHER THAN THE
PERSISTENT RIDGE...IS A WEAK SYSTEM MOVING INTO NORTHERN
CALIFORNIA AT 240 HOURS ALLOWING WESTERN UTAH TO EXPERIENCE AN
INCREASING SOUTHWEST FLOW AS THE RIDGE IS PUSHED EASTWARD AND
BECOMES A BIT MORE AMPLIFIED. HOWEVER...THE AIRMASS STILL REMAINS
RATHER DRY.

&&

.AVIATION...VFR CONDITIONS WILL CONTINUE AT THE KSLC TERMINAL
THROUGH THE PERIOD.  SOUTH WINDS ARE EXPECTED TO BECOME NORTHWEST
AROUND 2200 UTC.  THERE IS A 20 PERCENT CHANCE THAT A THUNDERSTORM
COULD IMPACT THE TERMINAL THIS AFTERNOON OR EVENING. SOUTHEAST
DRAINAGE WINDS ARE EXPECTED TO RETURN AROUND 0400 UTC...ALTHOUGH
THERE IS A 30 PERCENT CHANCE THIS COULD OCCUR BY 0300 UTC.

&&

.FIRE WEATHER...MID LEVEL MOISTURE WILL REMAIN OVER THE
REGION...GENERALLY EAST OF THE I-15 CORRIDOR...RESULTING IN
ISOLATED THUNDERSTORMS OVER THE VALLEYS AND WIDELY SCATTERED
THUNDERSTORMS OVER THE MOUNTAINS THIS EVENING AND AGAIN ON SUNDAY.
THE DRIER AIR SETTING IN ACROSS THE EXTREME WEST WILL LIKELY CAUSE A
FEW SPOTS TO COME CLOSE TO CRITICAL FIRE WEATHER CONDITIONS THIS
AFTERNOON AND EARLY EVENING. WINDS WILL BE LESS SUNDAY SO THE THREAT
OF REACHING CRITICAL CONDITIONS WILL BE MINIMAL AT BEST.

A RIDGE OF HIGH PRESSURE WILL BUILD OVER THE GREAT BASIN NEXT WEEK
WHICH WILL CAUSE A WARMING AND DRYING TREND WITH SIGNIFICANTLY LOWER
SURFACE RELATIVE HUMIDITIES. LIGHT WINDS WILL ACCOMPANY THIS HOT AND
MAINLY DRY SPELL. HOWEVER...DESPITE THESE DRIER SURFACE
CONDITIONS...ENOUGH MID-LEVEL MOISTURE WILL LIKELY LINGER FOR A
CONTINUED THREAT OF ISOLATED AFTERNOON THUNDERSTORMS...PARTICULARLY
OVER THE HIGHER TERRAIN.

&&

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

PUBLIC.........YOUNG
FIRE WEATHER...STRUTHWOLF
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
640 AM MDT SAT AUG 20 2011

UTZ001>016-019>021-517-518-WYZ021-211300-
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-
640 AM MDT SAT AUG 20 2011

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

.DAY ONE...TODAY AND TONIGHT

A WEAK WEATHER DISTURBANCE WILL SPAWN AN AREA OF THUNDERSTORMS
NEAR THE IDAHO BORDER THROUGH MID-MORNING. ABUNDANT MOISTURE
ACROSS SOUTHERN...CENTRAL AND EASTERN UTAH WILL SUPPORT ANOTHER
ROUND OF SHOWERS AND THUNDERSTORMS ACROSS THOSE AREAS THIS
AFTERNOON THROUGH THIS EVENING. BRIEF HEAVY RAIN COULD DEVELOP
WITH THE STRONGER STORMS...MAINLY ACROSS SOUTHERN UTAH.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

MOISTURE WILL REMAIN IN PLACE ACROSS MUCH OF SOUTHERN AND EASTERN
UTAH THROUGH SUNDAY...WITH SCATTERED SHOWERS AND THUNDERSTORMS
THE LIKELY RESULT DURING THE AFTERNOON AND EVENING HOURS.

HIGH PRESSURE ALOFT EXPANDING NORTH AND WEST OUT OF THE SOUTHERN
ROCKIES WILL BRING MODESTLY WARMER TEMPERATURES TO MUCH OF UTAH
BEGINNING MIDWEEK. SOME MOISTURE WILL REMAIN ACROSS THE GREAT BASIN
DURING THE WEEK...THOUGH THUNDERSTORM ACTIVITY THAT DOES DEVELOP WILL
LIKELY REMAIN ISOLATED UNDER THE STABLE HIGH PRESSURE.

.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)