Severe Thunderstorm Warning 40, NWS Salt Lake City, UT

000 
WWUS55 KSLC 031915
SVSSLC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
115 PM MDT FRI JUL 3 2009

UTC017-025-031930-
/O.CON.KSLC.SV.W.0040.000000T0000Z-090703T1930Z/
GARFIELD UT-KANE UT-
115 PM MDT FRI JUL 3 2009

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 130 PM MDT
FOR NORTH CENTRAL KANE AND SOUTHWESTERN GARFIELD COUNTIES...

AT 110 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 OVER KODACHROME BASIN STATE PARK...OR 6 MILES SOUTH OF 
CANNONVILLE...MOVING SOUTHEAST AT 10 MPH.

LAT...LON 3756 11182 3732 11197 3751 11222 3766 11208
TIME...MOT...LOC 1912Z 313DEG 9KT 3748 11205

$$

MS

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
938 AM MDT FRI JUL 3 2009

.SYNOPSIS...WEAK DISTURBANCES WILL PASS OVER NORTHERN UTAH TODAY
AND TOMORROW. A DRIER AIRMASS WILL GRADUALLY SPREAD BACK INTO THE
AREA FROM THE WEST SUNDAY INTO NEXT WEEK.

&&

.DISCUSSION...ANOTHER DAY OF ACTIVE WEATHER IS BEGINNING ACROSS
THE CWA THIS MORNING. WHILE MOSTLY CLEAR SKIES ARE PRESENT ACROSS
THE REGION AT THIS TIME...THIS WILL CHANGE RAPIDLY OVER THE NEXT
FEW HOURS.

SEVERAL UPPER LEVEL DISTURBANCES ARE NOTED IN WATER VAPOR IMAGERY
THIS MORNING. THESE DISTURBANCES WILL MOVE ACROSS NORTHERN UTAH
THIS MORNING INTO THIS AFTERNOON...CREATING A SOURCE OF LIFT TO
AID IN CONVECTIVE DEVELOPMENT FOR THE NORTHERN HALF OF UTAH. THE
12Z SOUNDING AT SLC INDICATED A PW VALUE NEAR 1.23 INCHES THIS
MORNING...WHICH IS ALMOST 200 PERCENT OF NORMAL FOR THE DATE.
SUFFICIENT SHEAR ALSO EXISTS ACROSS THE NORTHERN HALF OF UTAH FOR
AT LEAST A FEW ORGANIZED THUNDERSTORMS. SEVERAL MODELS INDICATE
CAPE VALUES WILL NEAR 1000 TO 1500 J/KG ACROSS PORTIONS OF
NORTHERN UTAH.

WITH HIGH MOISTURE AVAILABILITY...SUFFICIENT SHEAR...LIFT AND
INSTABILITY...EXPECT WIDESPREAD CONVECTIVE DEVELOPMENT ACROSS
THE NORTHERN HALF OF UTAH THIS AFTERNOON. THE MAIN THREATS IN THIS
AREA WILL BE GUSTY WINDS...SMALL HAIL AND HEAVY
RAINFALL...ESPECIALLY FROM PROVO NORTH.

PW VALUES HAVE BEEN ON THE DECREASE ACROSS THE SOUTH OVER THE PAST
FEW HOURS...AND THIS TREND WILL CONTINUE. THE SOUTHERN HALF OF
UTAH IS FAR ENOUGH REMOVED FROM THE DISTURBANCES AFFECTING THE
NORTH TO KEEP ANY SEVERE THREAT IN THIS AREA MINIMAL. GIVEN THE
DRYING LOW-LEVELS...BRIEF GUSTY WINDS ARE POSSIBLE NEAR ANY OF
THE THUNDERSTORMS IN THE SOUTH. ISOLATED HEAVY RAINFALL CANNOT BE
RULED OUT EITHER GIVEN SLOWER STORM MOTIONS.

UPDATED ZONES TO LOWER PRECIP CHANCES ACROSS THE SOUTH THIS
MORNING AND TO INCREASE CHANCES ACROSS THE NORTH THIS MORNING INTO
THIS EVENING.

&&

.AVIATION...SURFACE WINDS AT THE SLC TERMINAL ARE EXPECTED TO TURN
TO THE NORTHWEST BETWEEN 18Z AND 20Z TODAY. HOWEVER...WINDS DURING
THE AFTERNOON HOURS ARE AGAIN LIKELY TO BE IMPACTED BY NEARBY
CONVECTIVE ACTIVITY. IN ADDITION TO GUSTY ERRATIC
WINDS...THUNDERSTORMS COULD ALSO CAUSE BRIEF PERIODS OF CEILINGS
BELOW 7000FT AGL.

&&

.FIRE WEATHER...THE AIRMASS ACROSS UTAH REMAINED VERY MOIST
OVERNIGHT WITH RELATIVE HUMIDITIES GREATER THAN 80 PERCENT
THROUGHOUT THE REGION EXCEPT THE EXTREME SOUTHWEST AND SOUTHEAST
WHERE RELATIVE HUMIDITIES WERE ABNORMALLY HIGH BETWEEN 50 AND 80
PERCENT. THE DEEP MOISTURE WILL GRADUALLY DECREASE TODAY AND
SATURDAY AND THEN BECOME BONE DRY FROM SUNDAY THROUGH THURSDAY
ACROSS MOST OF THE AREA. THE RELATIVE HUMIDITY MINIMUMS WILL DROP
BELOW 10 PERCENT IN MOST AREAS MONDAY THROUGH THURSDAY. POOR
RECOVERY OF LESS THAN 30 PERCENT IS EXPECTED AT NIGHT AS WELL.

&&

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

&&

KRUSE/STRUTHWOLF

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
248 AM MDT FRI JUL 3 2009

UTZ001>016-019>021-517-518-WYZ021-041200-
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-
248 AM MDT FRI JUL 3 2009

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

.DAY ONE...TODAY AND TONIGHT

SCATTERED AFTERNOON AND EVENING THUNDERSTORMS WILL BE CAPABLE OF
PRODUCING LOCALLY DAMAGING WINDS ACROSS THE STATE...AS WELL AS
LARGE HAIL PARTICULARLY ACROSS NORTHERN UTAH. LOCALLY HEAVY
RAINFALL IS ALSO EXPECTED WITH THE STRONGER STORMS.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

SIMILAR CONDITIONS ARE EXPECTED SATURDAY. THE AIRMASS WILL THEN
GRADUALLY DRY SUNDAY AND INTO EARLY NEXT WEEK. GUSTY SOUTHERLY WINDS
COULD DEVELOP BY MID WEEK...ESPECIALLY ACROSS WESTERN AND SOUTH
CENTRAL UTAH...POTENTIALLY AFFECTING WIND SENSITIVE OPERATIONS.

.SPOTTER INFORMATION STATEMENT...

WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.

ROGOWSKI

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
831 AM MDT FRI JUL 3 2009

UTZ001>016-019>021-517-518-WYZ021-040200-
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-
831 AM MDT FRI JUL 3 2009

...STRONG THUNDERSTORMS POSSIBLE TODAY...

SCATTERED THUNDERSTORMS WILL DEVELOP ACROSS UTAH AND EXTREME
SOUTHWEST WYOMING TODAY AS A SERIES OF DISTURBANCES MOVE ACROSS
NORTHERN UTAH. CONDITIONS ARE FAVORABLE FOR A FEW OF THESE STORMS
TO BECOME STRONG OR SEVERE...MAINLY ACROSS THE NORTHERN HALF OF
UTAH. THE PRIMARY SEVERE WEATHER THREATS WILL BE LOCALLY DAMAGING
WINDS...LARGE HAIL...HEAVY RAINFALL AND CLOUD TO GROUND LIGHTNING.
LOCALLY HEAVY RAINFALL IS ALSO POSSIBLE ACROSS SOUTHERN UTAH AND
CAUTION IS URGED IN NORMALLY FLOOD PRONE SLOT CANYONS AND DRY
WASHES THIS AFTERNOON.

THOSE PLANNING TO SPEND TIME OUTDOORS TODAY...ESPECIALLY ACROSS
THE NORTHERN HALF OF UTAH...SHOULD KEEP AN EYE TO THE SKY. SEEK
SHELTER IF THREATENING WEATHER APPROACHES. LISTEN TO NOAA WEATHER
RADIO OR LOCAL MEDIA FOR UPDATES TO THE FORECAST AND FOR POTENTIAL
WARNINGS.

FOR MORE INFORMATION FROM NOAA/S NATIONAL WEATHER SERVICE VISIT...
HTTP://WEATHER.GOV/SALTLAKECITY (ALL LOWER CASE)