Severe Thunderstorm Warning 52, NWS Salt Lake City, UT

000 
WWUS55 KSLC 141609
SVSSLC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
1009 AM MDT MON SEP 14 2009

UTC027-141630-
/O.CON.KSLC.SV.W.0052.000000T0000Z-090914T1630Z/
MILLARD UT-
1009 AM MDT MON SEP 14 2009

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1030 AM MDT
FOR SOUTH CENTRAL MILLARD COUNTY...

AT 1009 AM 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 OVER SOUTH CENTRAL MILLARD COUNTY...OR ABOUT 31 MILES
NORTHWEST OF MILFORD...MOVING NORTHEAST AT 25 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  RURAL CENTRAL MILLARD COUNTY AROUND 1020 AM MDT

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

THIS STORM IS CAPABLE OF PRODUCING QUARTER SIZE HAIL. SEEK SHELTER IN
A STURDY STRUCTURE UNTIL THE STORM HAS PASSED.

&&

LAT...LON 3913 11357 3885 11295 3858 11326 3859 11363
TIME...MOT...LOC 1609Z 203DEG 23KT 3879 11332

$$

YOUNG

000 
WWUS55 KSLC 141626
SVSSLC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
1026 AM MDT MON SEP 14 2009

UTC027-141637-
/O.EXP.KSLC.SV.W.0052.000000T0000Z-090914T1630Z/
MILLARD UT-
1026 AM MDT MON SEP 14 2009

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL MILLARD COUNTY
WILL EXPIRE AT 1030 AM MDT...

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

LAT...LON 3913 11357 3885 11295 3858 11326 3859 11363
TIME...MOT...LOC 1627Z 203DEG 23KT 3890 11326

$$

YOUNG

AREA FORECAST DISCUSSION...CORRECTED
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
450 AM MDT MON SEP 14 2009

CORRECTED SYNOPSIS

.SYNOPSIS...A PACIFIC LOW PRESSURE SYSTEM WILL MOVE INTO THE
GREAT BASIN TODAY...AND LINGER THROUGH MID-WEEK. A DRIER AIRMASS
IS EXPECTED TO RETURN FOR THE LATTER PORTION OF THE WEEK INTO THE
UPCOMING WEEKEND.

&&

.DISCUSSION...EARLY MORNING WATER VAPOR IMAGERY AND OBJECTIVE
ANALYSIS DEPICT A MEAN SOUTHWESTERLY FLOW ALOFT ACROSS MUCH OF
THE INTERMOUNTAIN REGION. A SHORTWAVE RIDGE EMBEDDED WITHIN THIS
FLOW CURRENTLY RESIDES ACROSS THE EASTERN GREAT BASIN...SANDWICHED
BETWEEN AN UPPER LOW LIFTING ACROSS CENTRAL MT...AND A NEGATIVELY
TILTED SHORTWAVE TROUGH SPREADING INLAND ALONG THE CA COAST. A
FAIRLY MOIST AIRMASS IS ALSO EVIDENT ACROSS THE FORECAST AREA WITH
GOES DERIVED PW VALUES GENERALLY IN THE 0.5-0.75 INCH RANGE...AND
SURFACE DEW POINTS IN THE UPPER 40S TO LOW 50S.

A FEW SHOWERS/THUNDERSTORMS WILL LIKELY LINGER ACROSS THE FORECAST
AREA THIS MORNING GIVEN MOISTURE IN PLACE...AND HAVE MAINTAINED
LOW POPS THROUGHOUT THIS TIMEFRAME. CONVECTION IS EXPECTED TO
BECOME FAIRLY WIDESPREAD DURING THE AFTERNOON AND EVENING HOURS CA
SHORTWAVE CLOSES OFF AND PROPAGATES INTO THE GREAT
BASIN...ALLOWING BROAD AREA OF UPPER DIFFLUENCE TO SPREAD ACROSS
NORTHERN AND CENTRAL UT. DEEP LAYER SHEAR IS SUPPORTIVE OF
ORGANIZED CONVECTION THIS AFTERNOON AND EVENING SUGGESTING SOME
POTENTIAL FOR ISOLATED SEVERE CELLS...ALTHOUGH ABUNDANCE OF CLOUD
COVER MAY LIMIT SURFACE HEATING AND RESULTANT INSTABILITY.
NONETHELESS ANTICIPATE HEAVY RAINFALL TO BE THE PRIMARY THREAT
WITH ANY STORMS WHICH DEVELOP...AND HAVE MAINTAINED GOING WORDING
IN ZONES/GRIDS. MODELS DO SUGGEST A MID LEVEL DRY SLOT WILL
OVERSPREAD FAR SOUTHERN UT THIS AFTERNOON/EVENING WHICH MAY
LIMIT CONVECTIVE COVERAGE ACROSS UTAHS DIXIE AND ADJACENT AREAS.

UPPER LOW TO SLOWLY TREK EASTWARD TONIGHT THROUGH TUESDAY
MORNING...AND THUS ANTICIPATE SHOWER/THUNDERSTORM ACTIVITY TO
PERSIST THROUGHOUT MUCH OF THE OVERNIGHT HOURS. WITH UPPER LOW
OVERHEAD TUESDAY ANTICIPATE ANOTHER DAY OF FAIRLY WIDESPREAD
SHOWER/THUNDERSTORM COVERAGE ACROSS MUCH OF THE AREA.

00Z MODELS ARE SUGGESTING THIS UPPER LOW WILL SLOWLY MIGRATE
SOUTHWARD OUT OF UT AND INTO AZ/NM DURING THE WED/THURS TIMEFRAME.
AS SUCH HAVE GONE WITH A DIMINISHING TREND IN POPS FROM NORTH TO
SOUTH DURING THIS TIME. IN THE WAKE OF THIS WAVE A GENERALLY DRY
WESTERLY FLOW LOOKS TO SET UP FOR LATE IN THE WEEK THROUGH MUCH OF
THE UPCOMING WEEKEND. A MID LEVEL RIDGE LOOKS TO BECOME
ESTABLISHED ALONG THE WEST COAST BY EARLY NEXT WEEK ALLOWING FOR A
DRY NORTHWEST FLOW ACROSS THE REGION.

&&

.AVIATION...PREDOMINANT VFR CONDITIONS ARE EXPECTED TODAY AT THE
SLC TERMINAL. WINDS SHOULD BE SOUTHERLY THROUGHOUT THE
DAY...BECOMING GUSTY IN THE AFTERNOON. SHOWERS AND THUNDERSTORMS
WILL LIKELY IMPACT THE TERMINAL THIS AFTERNOON...AND THESE COULD
RESULT IN OCCASIONALLY ERRATIC WINDS. THERE IS A 30 PERCENT CHANCE
OF TEMPORARY MVFR CONDITIONS WITHIN HEAVIER SHOWERS/THUNDERSTORMS.

&&

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

&&

SEAMAN/TRAPHAGAN

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
434 AM MDT MON SEP 14 2009

UTZ001>016-019>021-517-518-WYZ021-151200-
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-
434 AM MDT MON SEP 14 2009

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

.DAY ONE...TODAY AND TONIGHT

NUMEROUS SHOWERS AND THUNDERSTORMS ARE EXPECTED ACROSS THE
OUTLOOK AREA THIS AFTERNOON AND EVENING AS A PACIFIC STORM SYSTEM
MOVES INTO THE GREAT BASIN. A FEW OF THESE STORMS MAY BECOME
STRONG TO SEVERE...WITH HAIL AND STRONG WINDS POSSIBLE. THE
POTENTIAL ALSO EXISTS FOR LOCALLY HEAVY RAINFALL WITH THESE
STORMS...WHICH MAY ALLOW FOR LOCALIZED FLASH FLOODING ACROSS
FLOOD PRONE AREAS OF SOUTHERN UTAH.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

THIS STORM SYSTEM WILL LINGER ACROSS THE REGION TUESDAY THROUGH
WEDNESDAY...ALLOWING FOR ADDITIONAL SHOWERS AND THUNDERSTORMS EACH
DAY. A DRIER AIRMASS IS EXPECTED TO RETURN TO THE REGION DURING
THE LATER PORTION OF THE WORK WEEK.

.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)

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
905 AM MDT MON SEP 14 2009

UTZ015-016-141545-
SOUTHWEST UTAH UT-WEST CENTRAL UTAH UT-
905 AM MDT MON SEP 14 2009

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN MILLARD AND NORTHERN
BEAVER COUNTIES UNTIL 945 AM MDT...

AT 900 AM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 29 MILES WEST OF MILFORD...MOVING NORTHEAST AT 30
MPH.

PENNY TO NICKEL SIZE HAIL AND WIND GUSTS OF 40 TO 55 MPH ARE EXPECTED
WITH THIS STORM. THIS STRONG STORM IS CURRENTLY 5 MILES SOUTH OF
HIGHWAY 21 IN THE VICINITY OF WAH WAH PASS. TRAVELERS ALONG HIGHWAY
21 SHOULD PREPARE FOR HEAVY RAINFALL CAPABLE OF PONDING ON THE
ROADWAY AS WELL AS GUSTY CROSS WINDS AND SMALL HAIL.

* LOCATIONS IMPACTED INCLUDE...
  RURAL NORTHERN BEAVER COUNTY...
  RURAL SOUTHWESTERN MILLARD COUNTY...
  RURAL SOUTHERN MILLARD COUNTY...

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

LAT...LON 3898 11348 3873 11301 3837 11349 3845 11370
TIME...MOT...LOC 1503Z 207DEG 27KT 3850 11354

MERRILL