Severe Thunderstorm Warning 33, NWS Salt Lake City, UT

723 
WWUS55 KSLC 182120
SVSSLC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
320 PM MDT THU SEP 18 2014

UTC003-182130-
/O.CON.KSLC.SV.W.0033.000000T0000Z-140918T2130Z/
BOX ELDER UT-
320 PM MDT THU SEP 18 2014

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM MDT
FOR NORTHWESTERN BOX ELDER COUNTY...

AT 318 PM MDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE
OF PRODUCING HALF DOLLAR SIZE HAIL AND DESTRUCTIVE WINDS IN EXCESS OF
70 MPH. THIS STORM WAS LOCATED 7 MILES NORTHWEST OF PARK VALLEY...OR
27 MILES SOUTH OF MALTA...MOVING NORTHEAST AT 40 MPH.

LOCATIONS IMPACTED INCLUDE...
PARK VALLEY...STANDROD...YOST AND ROSETTE. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DOPPLER RADAR HAS INDICATED ROTATION WITHIN THIS STORM. ALTHOUGH A 
TORNADO IS NOT IMMEDIATELY LIKELY...IF ONE IS SPOTTED... ACT QUICKLY 
AND MOVE TO A PLACE OF SAFETY IN A STURDY STRUCTURE... SUCH AS A 
BASEMENT OR SMALL INTERIOR ROOM.

IF YOU ARE IN THE PATH OF THIS STORM...PREPARE IMMEDIATELY FOR LARGE
HAIL AND DEADLY CLOUD TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE
TO A SHELTER...PREFERABLY INSIDE A STRONG BUILDING AND AWAY FROM
WINDOWS.

&&

LAT...LON 4167 11348 4167 11351 4177 11368 4183 11366
      4199 11356 4199 11306
TIME...MOT...LOC 2118Z 213DEG 35KT 4191 11342 

$$

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
958 AM MDT THU SEP 18 2014

.SYNOPSIS...AN UPPER TROUGH WILL SLOWLY ADVANCE INTO THE WESTERN
GREAT BASIN TODAY THROUGH TONIGHT THEN FORM A CLOSED LOW OFF THE
SOUTHERN CALIFORNIA COAST BY LATE FRIDAY. MOISTURE WILL INCREASE
ACROSS UTAH TODAY AHEAD OF THIS TROUGH AND REMAIN INTO FRIDAY.

&&

.DISCUSSION...A PACIFIC TROUGH IS MOVING THROUGH THE WEST COAST
THIS MORNING...WITH A PORTION OF THIS TROUGH EXPECTED TO SLIDE
INTO THE GREAT BASIN LATER TODAY. OUT AHEAD OF THIS TROUGH...UTAH
AND SOUTHWEST WYOMING HAS SUNNY SKIES THIS MORNING...WITH AN
INCREASING SOUTHWESTERLY FLOW ALOFT.

ADDITIONAL MOISTURE HAS MOVED OVER THE CWA OVERNIGHT...WITH
SATELLITE IMAGERY INDICATING PRECIPITABLE WATER VALUES FROM 0.7 TO
1.1 INCHES OVER THE AREA. THIS MOISTURE SHOULD HELP FUEL SHOWERS
AND THUNDERSTORMS THIS AFTERNOON. IN THE SOUTHERN HALF OF THE
STATE...CONVECTIVE ACTIVITY SHOULD INITIATE PRIMARILY ON THE
HIGHER TERRAIN. IN THE NORTH...MORE ORGANIZED CONVECTION COULD
DEVELOP AS THE TROUGH BEGINS IMPACTING THE AREA...ESPECIALLY IN
THE NORTHWEST CORNER OF UTAH. WITH 0-6 KM BULK SHEAR OF GENERALLY
30-40 KNOTS...SOME OF THESE STORMS COULD BECOME SEVERE. WILL ALSO
HAVE TO KEEP AN EYE OUT FOR THE POTENTIAL OF LOCALIZED FLASH
FLOODING...AS THE MOISTER AIRMASS COULD SUPPORT HEAVY RAINERS. AS
FAR AS THE WASATCH FRONT IS CONCERNED...ISOLATED TO WIDELY
SCATTERED SHOWERS ARE POSSIBLE THROUGH THE AFTERNOON HOURS...BUT
MANY PEOPLE MAY HAVE TO WAIT UNTIL THE EVENING AND OVERNIGHT HOURS
FOR A BETTER CHANCE OF RAINFALL.

THE FORECAST FOR TODAY LOOKS FINE AND NO UPDATES ARE PLANNED FOR
THIS MORNING.

&&

.AVIATION...WINDS AT THE SLC TERMINAL ARE EXPECTED TO SWITCH TO
THE NORTHWEST BETWEEN 21Z AND 23Z...BUT THERE IS A SLIGHT CHANCE
THAT WINDS SIMPLY REMAIN SOUTHERLY THROUGH THE REST OF THE DAY.
THERE IS ALSO A 30 PERCENT CHANCE THAT A THUNDERSTORM COULD IMPACT
THE TERMINAL BETWEEN 20Z AND 02Z...WITH GUSTY ERRATIC WINDS AS THE
MOST LIKELY IMPACT. RAIN WILL LIKELY INCREASE OVER THE AREA AFTER
02Z.

&&

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

SCHOENING

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
554 AM MDT THU SEP 18 2014

UTZ001>016-019>021-517-518-WYZ021-191200-
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-
554 AM MDT THU SEP 18 2014

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

.DAY ONE...TODAY AND TONIGHT

SHOWERS AND THUNDERSTORMS WILL DEVELOP ACROSS THE OUTLOOK AREA
THIS AFTERNOON MOST NUMEROUS OVER THE NORTHWEST. SHOWERS WILL
INCREASE ACROSS MUCH OF THE WESTERN OUTLOOK AREA TONIGHT. SOME OF
THE STRONGER STORMS THIS AFTERNOON AND TONIGHT COULD PRODUCE
LOCALLY HEAVY RAINFALL. HAIL AND STRONG GUSTY WINDS ARE ALSO
POSSIBLE OVER NORTHWESTERN UTAH THIS AFTERNOON AND THIS EVENING.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

SHOWERS AND THUNDERSTORMS WILL CONTINUE ACROSS MUCH OF THE AREA
FRIDAY MORNING...WITH DRIER CONDITIONS SPREADING IN FROM THE WEST
FRIDAY AFTERNOON THROUGH FRIDAY NIGHT.

SHOWERS WILL RETURN TO SOUTHERN UTAH LATE SATURDAY...WITH SHOWERS
AND THUNDERSTORMS SPREADING ACROSS MOST OF THE OUTLOOK AREA AGAIN
SATURDAY NIGHT THROUGH MONDAY. LOCALLY HEAVY RAINFALL WILL ONCE
AGAIN BE POSSIBLE WITH THESE STORMS.

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

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
241 PM MDT THU SEP 18 2014

UTZ005-182115-
GREAT SALT LAKE DESERT AND MOUNTAINS UT-
241 PM MDT THU SEP 18 2014

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN BOX ELDER COUNTY
UNTIL 315 PM MDT...

AT 240 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 25 MILES
SOUTHWEST OF ALMO TO 19 MILES SOUTHWEST OF PARK VALLEY...AND MOVING
NORTH AT 40 MPH.

HALF INCH HAIL AND WINDS OF 40 TO 55 MPH WILL BE POSSIBLE.

LOCATIONS IMPACTED INCLUDE...
STANDROD...ETNA...GROUSE CREEK...YOST...ROSETTE AND LYNN.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4199 11334 4157 11350 4146 11358 4170 11404
      4199 11404
TIME...MOT...LOC 2040Z 190DEG 35KT 4184 11398 4161 11360