Severe Thunderstorm Warning 19, NWS Salt Lake City, UT

917 
WWUS55 KSLC 011900
SVSSLC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
100 PM MDT SAT SEP 1 2012

UTC023-027-011930-
/O.CON.KSLC.SV.W.0019.000000T0000Z-120901T1930Z/
MILLARD UT-JUAB UT-
100 PM MDT SAT SEP 1 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 130 PM MDT
FOR SOUTH CENTRAL JUAB AND CENTRAL MILLARD COUNTIES...

AT 1257 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING
DESTRUCTIVE WINDS IN EXCESS OF 70 MPH.  THESE STORMS WERE LOCATED
ALONG A LINE EXTENDING FROM NORTH CENTRAL MILLARD COUNTY TO CENTRAL
MILLARD COUNTY...MOVING NORTHEAST AT 30 MPH.

* LOCATIONS IN THE WARNING INCLUDE...
  HIGHWAY 6 SOUTHWEST OF DELTA IN CENTRAL MILLARD COUNTY

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM IS CAPABLE OF PRODUCING A SIGNIFICANT AMOUNT OF HAIL. HAIL
MAY ACCUMULATE ON AREA ROADS RESULTING IN DANGEROUS TRAVEL
CONDITIONS.

INTENSE LIGHTNING IS OCCURRING WITH THIS STORM. IF OUTDOORS...STAY
AWAY FROM ISOLATED HIGH OBJECTS SUCH AS TREES. MOVE INDOORS IF
POSSIBLE. WHEN INDOORS...STAY AWAY FROM WINDOWS AND DOORS AND AVOID
USING TELEPHONES UNLESS IT IS AN EMERGENCY. TRY TO UNPLUG UNNECESSARY
ELECTRICAL APPLIANCES BEFORE THE THUNDERSTORM APPROACHES.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM MDT
SATURDAY EVENING FOR CENTRAL UTAH AND SOUTHWEST WYOMING.

&&

LAT...LON 3900 11332 3951 11304 3958 11267 3901 11297
TIME...MOT...LOC 1859Z 229DEG 25KT 3948 11288 3915 11311

$$

MPS

838 
WWUS55 KSLC 011925
SVSSLC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
125 PM MDT SAT SEP 1 2012

UTC023-027-011935-
/O.EXP.KSLC.SV.W.0019.000000T0000Z-120901T1930Z/
MILLARD UT-JUAB UT-
125 PM MDT SAT SEP 1 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL JUAB AND CENTRAL
MILLARD COUNTIES WILL EXPIRE AT 130 PM MDT...

THE STORMS HAVE WEAKENED AND ARE NO LONGER SEVERE. THEREFORE THE
WARNING HAS BEEN ALLOWED TO EXPIRE.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM MDT FOR 
THE AREA. CONDITIONS REMAIN FAVORABLE FOR THE DEVELOPMENT OF SEVERE 
THUNDERSTORMS. PLEASE STAY TUNED TO NOAA WEATHER RADIO OR LOCAL MEDIA
OUTLETS FOR ADDITIONAL SEVERE WEATHER INFORMATION.

LAT...LON 3900 11332 3951 11304 3958 11267 3901 11297
TIME...MOT...LOC 1925Z 229DEG 25KT 3960 11270 3927 11293

$$

MPS

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
1019 AM MDT SAT SEP 1 2012

.SYNOPSIS...A MOIST SOUTHWEST FLOW WILL REMAIN OVER THE AREA
TODAY. DRIER AIR WILL MOVE INTO ALL BUT SOUTHEAST UTAH TOMORROW.
SOUTHERN UTAH WILL REMAIN MOIST FOR MUCH OF THE REST OF THE WEEK
WHILE DRIER AIR STAYS OVER NORTHERN UTAH.

&&

.DISCUSSION...TROUGH OFF THE CALIFORNIA COAST HAS INCREASED
SOUTHWEST FLOW OVER THE FORECAST AREA THIS MORNING...DRAWING
MOISTURE NORTHWARD. SATELLITE DERIVED PWS ARE IN THE 0.7 TO 0.9
INCH RANGE OVER THE STATE...AND MODELS INDICATE WIDESPREAD 1.0
INCH VALUES THIS AFTERNOON...AND AS HIGH AS 1.2 INCH IN SOUTHEAST
UTAH. ADDITIONALLY...EJECTING SHORTWAVES OUT AHEAD OF THE MAIN
TROUGH WILL PROVIDE FOR ADDITIONAL INSTABILITY...PARTICULARLY OVER
NORTHERN UTAH. SOME DRIER AIR IS PROGGED TO PUSH INTO FAR
SOUTHWEST UTAH THIS AFTERNOON...WHICH MAY LIMIT CONVECTION A BIT
IN THOSE AREAS. HOWEVER...FLOODING POTENTIAL REMAINS SO GOING
WATCH FOR SOUTHERN UTAH LOOKS GOOD. UPDATED EARLIER TO RAISE POPS
OVER SOUTHEAST UTAH WHERE THE BEST MOISTURE IS. NO ADDITIONAL
UPDATES PLANNED.

THE DRIER AIR MOVING INTO SOUTHWEST UTAH LOOKS TO PUSH INTO ALL
BUT SOUTHEAST UTAH TOMORROW SO CONVECTION WILL BE MUCH MORE
LIMITED IN COVERAGE TOMORROW AND MONDAY. FLOW IS EXPECTED TO
BECOME MORE WESTERLY BEGINNING TUESDAY AS THE RIDGE OVER THE
CENTRAL UNITED STATES FLATTENS OUT IN RESPONSE TO A PACIFIC
NORTHWEST TROUGH MOVING ACROSS SOUTHERN CANADA. THIS WILL ALLOW
MOISTURE TO CREEP BACK INTO CENTRAL AND SOUTHWEST UTAH AS NORTHERN
UTAH REMAINS DRY. MODELS INDICATE THIS PATTERN WILL REMAIN IN
PLACE FOR MUCH OF THE WEEK. THERE IS SOME INDICATION THAT MORE
SIGNIFICANT DRYING WILL OCCUR BY THE WEEKEND.

&&

.AVIATION...THE SLC TERMINAL WILL SEE VFR CONDITIONS THROUGH THE
EVENING. SOUTHEAST WINDS ARE EXPECTED TO SHIFT TO THE NORTHWEST
BETWEEN 19Z AND 21Z...BUT THERE IS A 20 PERCENT CHANCE THAT WINDS
WILL SHIFT LATER THAN EXPECTED OR SOUTHERLY WINDS WILL PERSIST
THROUGHOUT THE DAY. SHOWERS AND THUNDERSTORMS IN THE VICINITY OF
THE TERMINAL WILL LIKELY CAUSE PERIODS OF GUSTY AND/OR ERRATIC
WINDS THIS AFTERNOON THROUGH EARLY THIS EVENING. THERE IS A 30
PERCENT CHANCE THAT A THUNDERSTORM WILL DIRECTLY IMPACT THE
TERMINAL DURING THAT TIME.

&&

.FIRE WEATHER...STORMS WILL BECOME WIDESPREAD THIS AFTERNOON
STATEWIDE. WITH DEEP MOISTURE IN PLACE...THE MAJORITY OF STORMS WILL
BE ACCOMPANIED BY WETTING RAIN. WITH JET ENERGY OVER THE
STATE...SOME STORMS MAY BECOME ESPECIALLY STRONG.

DRIER AIR WILL MOVE INTO THE STATE FROM THE SOUTHWEST THIS
AFTERNOON/EVENING...DECREASING COVERAGE/INTENSITY OF STORMS. STORMS
ARE EXPECTED TO DEVELOP AGAIN TOMORROW AFTERNOON PRIMARILY ACROSS
SOUTHEASTERN UTAH...BUT WILL BE LESS WIDESPREAD THAN TODAY.  DRY AIR
WILL REMAIN OVER THE STATE THROUGH EARLY NEXT WEEK...BEFORE
MONSOONAL MOISTURE RETURNS LATER IN THE WEEK.

&&

.SLC WATCHES/WARNINGS/ADVISORIES...
UT...FLASH FLOOD WATCH THROUGH THIS EVENING FOR
     UTZ008-010-012-013-016-019>021-517-518.

WY...NONE.
&&

PUBLIC/AVIATION...TRAPHAGAN
FIRE WEATHER...HOSENFELD

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
644 AM MDT SAT SEP 1 2012

UTZ001>016-019>021-517-518-WYZ021-021200-
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-
644 AM MDT SAT SEP 1 2012

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

.DAY ONE...TODAY AND TONIGHT

SCATTERED TO NUMEROUS SHOWERS AND THUNDERSTORMS WILL PERSIST
ACROSS THE NORTHEASTERN OUTLOOK AREA INTO MID MORNING...AND WILL
REDEVELOP ACROSS MUCH OF THE OUTLOOK AREA LATE MORNING THROUGH
EARLY THIS EVENING.

THERE IS A GOOD CHANCE OF LOCALLY HEAVY RAINFALL FROM THESE STORMS
AND FLASH FLOODING IS POSSIBLE...MAINLY IN THE MORE FLOOD PRONE
AREAS ACROSS SOUTHERN AND CENTRAL UTAH SUCH AS SLOT CANYONS...
NORMALLY DRY WASHES AND RECENT BURN SCARS.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

DRYING WILL SPREAD INTO THE NORTHERN AND CENTRAL OUTLOOK AREA
SUNDAY AND CONTINUE THROUGH THE FIRST PART OF THE WEEK...ALTHOUGH
ISOLATED AFTERNOON MOUNTAIN THUNDERSTORMS ARE STILL POSSIBLE.

SOME MOISTURE WILL REMAIN ACROSS ABOUT THE SOUTHERN THIRD OF THE
AREA WHERE THE THREAT OF AFTERNOON THUNDERSTORMS WILL CONTINUE
...THEN WORK BACK NORTH AROUND MIDWEEK BRINGING A GREATER THREAT OF
THUNDERSTORMS BACK INTO THAT AREA.

.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 TRAVEL IMPACTS VISIT...
HTTP://WWW.UDOTTRAFFIC.UTAH.GOV/ROADWEATHERFORECAST.ASPX

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
1104 AM MDT SAT SEP 1 2012

UTZ015-011800-
WEST CENTRAL UTAH UT-
1104 AM MDT SAT SEP 1 2012

...SIGNIFICANT WEATHER ADVISORY FOR WESTERN MILLARD COUNTY UNTIL NOON
MDT...

AT 1100 AM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
PAIR OF STRONG THUNDERSTORMS. ONE OF THESE STORMS WAS NEAR KINGS
CANYON ALONG HIGHWAY 6...WHILE THE OTHER WAS EAST OF GARRISON ALONG
HIGHWAY 21. THESE STORMS WERE MOVING EAST AT 20 MPH.

PENNY TO NICKEL SIZE HAIL AND WIND GUSTS OF 40 TO 55 MPH ARE EXPECTED
WITH THESE STORMS...ALONG WITH HEAVY RAIN AND FREQUENT DANGEROUS
LIGHTNING.

* LOCATIONS IMPACTED INCLUDE...
   HIGHWAY 6 NEAR KINGS CANYON
   HIGHWAY 21 EAST OF GARRISON

THESE STORM IS CAPABLE OF PRODUCING A SIGNIFICANT AMOUNT OF HAIL.
HAIL MAY ACCUMULATE ON AREA ROADS RESULTING IN DANGEROUS TRAVEL
CONDITIONS.

LAT...LON 3937 11317 3867 11337 3864 11404 3914 11405
TIME...MOT...LOC 1702Z 250DEG 18KT 3904 11369 3874 11400

MPS

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
1201 PM MDT SAT SEP 1 2012

UTZ015-011900-
WEST CENTRAL UTAH UT-
1201 PM MDT SAT SEP 1 2012

...SIGNIFICANT WEATHER ADVISORY FOR WESTERN MILLARD COUNTY UNTIL 100
PM MDT...

AT 1156 AM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
PAIR OF STRONG THUNDERSTORMS LOCATED APPROXIMATELY 40 MILES WEST AND
SOUTHWEST OF DELTA...AND MOVING NORTHEAST AT 20 MPH.

PENNY TO NICKEL SIZE HAIL AND WIND GUSTS OF 40 TO 55 MPH ARE EXPECTED
WITH THESE STORMS...ALONG WITH VERY HEAVY RAIN AND FREQUENT DANGEROUS
LIGHTNING.

* LOCATIONS IMPACTED INCLUDE...
  HIGHWAY 6 BETWEEN DELTA AND KINGS CANYON
  RURAL WESTERN MILLARD COUNTY...

THIS STORM IS CAPABLE OF PRODUCING A SIGNIFICANT AMOUNT OF HAIL.
HAIL MAY ACCUMULATE ON HIGHWAY 6 POTENTIALLY RESULTING IN DANGEROUS
TRAVEL CONDITIONS.

LAT...LON 3950 11279 3884 11323 3881 11380 3947 11344
TIME...MOT...LOC 1758Z 241DEG 16KT 3923 11332 3893 11363

MPS