Severe Thunderstorm Warning 39, NWS Salt Lake City, UT

000 
WWUS55 KSLC 100304
SVSSLC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
905 PM MDT SAT AUG 9 2008

UTC003-100330-
/O.CON.KSLC.SV.W.0039.000000T0000Z-080810T0330Z/
BOX ELDER UT-
905 PM MDT SAT AUG 9 2008

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 930 PM MDT
FOR NORTH CENTRAL BOX ELDER COUNTY...

AT 903 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING NICKEL SIZE HAIL.
 THIS STORM WAS LOCATED 9 MILES EAST OF CURLEW JCT...OR ABOUT 9 MILES
WEST OF SNOWVILLE...MOVING NORTHEAST AT 28 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  SNOWVILLE BY 920 PM MDT...

LAT...LON 4200 11308 4200 11250 4181 11306 4189 11315
TIME...MOT...LOC 0305Z 234DEG 24KT 4196 11287

$$

SEAMAN

000 
WWUS55 KSLC 100336
SVSSLC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
935 PM MDT SAT AUG 9 2008

UTC003-100345-
/O.EXP.KSLC.SV.W.0039.000000T0000Z-080810T0330Z/
BOX ELDER UT-
935 PM MDT SAT AUG 9 2008

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL BOX ELDER COUNTY
HAS BEEN ALLOWED TO EXPIRE...

THE THUNDERSTORM WHICH PROMPTED THE WARNING HAS WEAKENED AND MOVED 
INTO SOUTHERN IDAHO. AS A RESULT THE WARNING HAS BEEN ALLOWED TO 
EXPIRE. ADDITIONAL STRONG THUNDERSTORMS WILL CONTINUE ACROSS WESTERN 
BOX ELDER AND TOOELE COUNTIES THROUGH 11 PM.  

LAT...LON 4200 11308 4200 11250 4181 11306 4189 11315
TIME...MOT...LOC 0304Z 234DEG 24KT 4196 11288

$$

SEAMAN

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
316 PM MDT SAT AUG 9 2008

.SYNOPSIS...A MOIST AIRMASS REMAINS IN PLACE ACROSS SOUTHERN AND
EASTERN UTAH TODAY. DRIER AIR WILL MOVE INTO MUCH OF UTAH TOMORROW
AND MONDAY.

&&

.DISCUSSION...CONVECTION HAS DEVELOPED ACROSS MUCH OF THE CWA THIS
AFTERNOON. WEAK SHEAR AND MODERATE INSTABILITY HAVE COMBINED TO
DEVELOP THUNDERSTORMS ACROSS PORTIONS OF CENTRAL AND SOUTHERN
UTAH. THUNDERSTORMS FORMED LATER IN THE DAY TODAY AS COMPARED TO
YESTERDAY. THIS HAS LIKELY ALLOWED MORE INSTABILITY TO DEVELOP
TODAY. A FEW STORMS HAVE QUICKLY MOVED OFF TERRAIN AND BECOME
OUTFLOW DOMINANT. IF THIS TREND CONTINUES...THE FLASH FLOOD THREAT
MAY BE LESS THAN ANTICIPATED THIS MORNING.

DEEP LAYER SHEAR IS MORE CONDUCIVE TO ORGANIZED CONVECTION ACROSS
THE NORTH...ALTHOUGH THE BEST THREAT REMAINS NORTH OF THE UTAH
BORDER. ANY THUNDERSTORMS THAT FORM ACROSS NORTHERN UTAH MAY
CONTAIN GUSTY WINDS...SMALL HAIL AND BRIEF HEAVY RAINS. A SPOTTER
FROM GRANTSVILLE HAS ALREADY REPORTED PENNY-SIZED HAIL THIS
AFTERNOON WITH A RELATIVELY WEAK CELL.

THUNDERSTORMS MAY TAKE AWHILE TO DIMINISH THIS EVENING AFTER
SUNSET. 12Z GFS/NAM HINTED AT A COMPLEX OF SHOWERS AND
THUNDERSTORMS MOVING ACROSS NORTHERN UTAH. MODELS DO NOT TYPICALLY
DO WELL WITH THIS TYPE OF EVENT...BUT IT IS SOMETHING TO MONITOR.

DRIER AIR WILL MOVE INTO WESTERN UTAH TOMORROW. THE FLASH FLOOD
THREAT IS EXPECTED TO BE REDUCED TO A MORE ISOLATED NATURE
TOMORROW STATE-WIDE. MONDAY WILL BRING EVEN DRIER CONDITIONS TO
UTAH. THE GFS AND EC HAVE BEEN INCONSISTENT ON THE TIMING OF THE
NEXT MOISTURE SURGE. DID NOT ADJUST LONG-TERM POP GRIDS MUCH DUE
TO RUN TO RUN CONSISTENCY ISSUES.

&&

.AVIATION...NORTHWEST WINDS ARE EXPECTED TO CONTINUE AT THE SLC
TERMINAL UNTIL THEY SHIFT TO THE SOUTHEAST BETWEEN 03Z AND 04Z.
SHOWERS AND THUNDERSTORMS WILL CONTINUE TO DEVELOP OVER NORTHERN
UTAH THIS AFTERNOON AND THESE STORMS COULD BRING PERIODS OF ERRATIC
AND OCCASIONALLY GUSTY WINDS TO THE TERMINAL THROUGH EARLY THIS
EVENING. THERE IS A 15 PERCENT CHANCE THAT A THUNDERSTORM WILL
MOVE OVER THE TERMINAL...AND THIS MAY CAUSE CIGS TO DROP BRIEFLY
TO OR BELOW 6000 FEET AGL.

&&

.SLC WATCHES/WARNINGS/ADVISORIES...
UT...FLASH FLOOD WATCH UNTIL 9 PM SATURDAY FOR UTZ010-UTZ011-UTZ012-
     UTZ013-UTZ020-UTZ021-UTZ517-UTZ518.

WY...NONE.

&&

PUBLIC...KRUSE
AVIATION...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
133 PM MDT SAT AUG 9 2008

UTZ001>016-019>021-517-518-WYZ021-101000-
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-
133 PM MDT SAT AUG 9 2008

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

.DAY ONE...TODAY AND TONIGHT

DEEP MOISTURE REMAINS IN PLACE ACROSS THE EASTERN PORTIONS OF THE
OUTLOOK AREA TODAY WITH DRIER AIR BEGINNING TO SPREAD INTO THE
WEST. SHOWERS AND THUNDERSTORMS WILL ONCE AGAIN DEVELOP OVER MOST OF
THE AREA.

SHOWERS AND THUNDERSTORMS WILL DECREASE THIS EVENING BUT ISOLATED
STORMS COULD CONTINUE OVER THE NORTH OVERNIGHT.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

THE AIRMASS ACROSS THE OUTLOOK AREA ON SUNDAY WILL BE DRIER AND
ONLY ISOLATED THUNDERSTORMS ARE EXPECTED OVER THE NORTHERN AND
EASTERN VALLEYS WHILE STORMS WILL BE SCATTERED OVER THE
MOUNTAINS.

THUNDERSTORM ACTIVITY WILL BE LIMITED TO ISOLATED SMALL STORMS
OVER THE MOUNTAINS BY MONDAY AFTERNOON WITH SIMILAR DRY CONDITIONS
TUESDAY.

MOISTURE MAY START TO SPREAD BACK INTO SOUTHERN UTAH ON WEDNESDAY
AND CREEP NORTH INTO CENTRAL UTAH THROUGH FRIDAY.

.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)