Severe Thunderstorm Warning 35, NWS Salt Lake City, UT

715 
WWUS55 KSLC 182328
SVSSLC

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

UTC003-182345-
/O.CON.KSLC.SV.W.0035.000000T0000Z-140918T2345Z/
BOX ELDER UT-
528 PM MDT THU SEP 18 2014

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM MDT
FOR NORTH CENTRAL BOX ELDER COUNTY...

AT 527 PM MDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE
OF PRODUCING QUARTER SIZE HAIL AND DAMAGING WINDS IN EXCESS OF 60
MPH. THIS STORM WAS LOCATED NEAR PARK VALLEY...OR 29 MILES WEST OF
SNOWVILLE...MOVING NORTHEAST AT 40 MPH.

LOCATIONS IMPACTED INCLUDE...
PARK VALLEY...ROSETTE AND CURLEW JUNCTION. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...DESTRUCTIVE HAIL...
DEADLY LIGHTNING AND VERY HEAVY RAIN. FOR YOUR PROTECTION MOVE TO AN
INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY
RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER
COVERS THE ROAD.

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS IN EXCESS OF 60 MPH
AND/OR LARGE HAIL AT LEAST ONE INCH IN DIAMETER. FOR YOUR
PROTECTION...MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR
HOME OR BUSINESS.

&&

LAT...LON 4168 11336 4174 11350 4199 11335 4200 11286
TIME...MOT...LOC 2327Z 220DEG 35KT 4186 11327 

$$

MPS

253 
WWUS55 KSLC 182345
SVSSLC

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

UTC003-182355-
/O.EXP.KSLC.SV.W.0035.000000T0000Z-140918T2345Z/
BOX ELDER UT-
545 PM MDT THU SEP 18 2014

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL BOX ELDER COUNTY
HAS EXPIRED...
        
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE LIMITS
AND EXITED THE WARNED AREA. THEREFORE THE WARNING HAS BEEN ALLOWED TO
EXPIRE.

LAT...LON 4168 11336 4174 11350 4199 11335 4200 11286
TIME...MOT...LOC 2343Z 220DEG 35KT 4186 11327 

$$

MPS

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
357 PM 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 HAS MOVED INTO THE GREAT BASIN THIS
AFTERNOON...AND HAS BEGUN IMPACTING NORTHERN UTAH. THUNDERSTORMS
IN THE FAR NORTHWEST CORNER OF UTAH HAVE BEEN INCREASING IN
INTENSITY THROUGH THE AFTERNOON...WITH AT LEAST ONE STORM
APPEARING SEVERE WITH STRONG ROTATION. A FEW ISOLATED STORMS HAVE
POPPED UP IN THE WARM SECTOR AHEAD OF THE TROUGH...BUT FOR THE
MOST PART CONVECTION ACROSS THE STATE HAS BEEN SURPRISINGLY
SUPPRESSED...DESPITE GOOD MOISTURE IN PLACE. HAVE MAINTAINED
SLIGHT CHANCE POPS IN THE SOUTHERN AND EASTERN VALLEYS THROUGH THE
00Z TO 12Z TIMEFRAME...BUT THE CHANCE FOR ANY SIGNIFICANT
CONVECTION IN THE SOUTHERN HALF OF THE CWA IS LOOKING SLIMMER BY
THE MINUTE.

ALSO DECREASING IN CONFIDENCE IS THE RAIN THAT IS EXPECTED TO MOVE
ACROSS THE WASATCH FRONT AND INTO SOUTHWEST WYOMING THIS EVENING
AND OVERNIGHT. STILL THINK RAINFALL IS LIKELY...BUT QPF OVER THE
LAST 36 HOURS HAS DECREASED AND BECOME MORE MOTH-EATEN IN VARIOUS
MODELS...SO IT IS NOT THE SLAM DUNK THAT IT LOOKED LIKE A COUPLE
DAYS AGO. PART OF THE REASON FOR THIS IS THAT THE LOW IS CUTTING
OFF MORE QUICKLY...PUSHING SOME OF THE DYNAMICS FURTHER SOUTH AND
WEST...AS WELL AS THE FACT THAT THE NORTHERN BRANCH OF THE TROUGH
IS PRIMARILY REMAINING NORTH OF THE AREA.

SHOWERS ARE GENERALLY EXPECTED TO DECREASE IN COVERAGE THROUGH
THE DAY FRIDAY...AS DRIER AIR FILTERS INTO THE CWA. THIS DRYING
WILL BE SHORT-LIVED...AS THE CLOSED LOW OVER SOUTHERN CALIFORNIA
PUSHES MOISTURE BACK INTO UTAH FROM THE SOUTH LATE SATURDAY.
PRECIPITATION ASSOCIATED WITH THE EASTERN EDGE OF THIS LOW IS
PROGGED TO MOVE INTO CENTRAL AND NORTHERN UTAH SATURDAY NIGHT AND
SUNDAY...WITH SHOWERS POTENTIALLY LINGERING INTO MONDAY AS THE LOW
IS OVERHEAD...BEFORE THE LOW EVENTUALLY EXITS INTO WYOMING. HAVE
CONTINUED TO INCREASE POPS FOR THIS SYSTEM...ESPECIALLY SATURDAY
NIGHT AND SUNDAY.

BEHIND THE LOW...HIGH PRESSURE WILL BUILD OVER THE GREAT BASIN
TUESDAY AND WEDNESDAY...BRINGING A WARMING AND DRYING TREND TO THE
AREA. BOTH THE ECMWF AND GFS BRING A LARGE TROUGH INTO THE WEST
COAST WEDNESDAY AND THURSDAY...BUT RECENT MODEL RUNS HAVE SLOWED
THE EASTWARD PROGRESSION OF THIS SYSTEM...LEAVING THE
INTERMOUNTAIN WEST IN THE WARM SECTOR THROUGH AT LEAST THURSDAY
AND POSSIBLY INTO FRIDAY. HAVE WARMED TEMPERATURES FOR WEDNESDAY
AND THURSDAY TO ACCOUNT FOR THIS SLOWER SOLUTION...WITH A WARM
AIRMASS AND INCREASINGLY STRONG SOUTHERLY FLOW HEADING INTO THE
END OF THE WORK WEEK.

&&

.AVIATION...GUSTY SOUTH WINDS THIS AFTERNOON ARE EXPECTED TO
PERSIST INTO THE EVENING HOURS. HOWEVER...THERE IS A 20 PERCENT
CHANCE THAT A SWITCH TO NORTHWEST WINDS ASSOCIATED WITH THE LAKE
BREEZE WILL OCCUR BETWEEN 2300 UTC AND 0100 UTC. THERE IS 40 PERCENT
CHANCE THAT A THUNDERSTORM WILL IMPACT THE TERMINAL BETWEEN 2300 UTC
AND 0400 UTC. HOWEVER...THERE IS A GREATER LIKELIHOOD THAT GUSTY
ERRATIC WINDS FROM NEARBY CONVECTION WILL IMPACT THE TERMINAL.

&&

.FIRE WEATHER...MOISTURE IN PLACE ACROSS NORTHERN AND CENTRAL UTAH
WILL MAINTAIN A THREAT FOR SHOWERS AND THUNDERSTORMS CAPABLE OF
PRODUCING WETTING RAINS THROUGH FRIDAY MORNING. HIGH PRESSURE
WILL BRING A BRIEF DRYING TREND LATER FRIDAY INTO SATURDAY. A
LOW PRESSURE SYSTEM WILL CROSS THE REGION DURING THE LATTER HALF
OF THE WEEKEND INTO EARLY NEXT WEEK BRINGING ANOTHER CHANCE FOR
SHOWERS AND THUNDERSTORMS CAPABLE OF PRODUCING WETTING RAINS.

&&

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

PUBLIC...SCHOENING
FIRE WEATHER...SEAMAN
AVIATION...GRAHAM

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

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

UTZ005-182330-
GREAT SALT LAKE DESERT AND MOUNTAINS UT-
445 PM MDT THU SEP 18 2014

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN BOX ELDER COUNTY
UNTIL 530 PM MDT...

AT 443 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 17 MILES SOUTHWEST OF PARK VALLEY...OR 40 MILES
NORTHEAST OF MONTELLO...MOVING NORTHEAST AT 35 MPH.

HALF INCH HAIL AND WIND GUSTS UP TO 50 MPH WILL BE POSSIBLE.

THIS STORM WILL CROSS HIGHWAY 30 SOUTHWEST OF PARK VALLEY.

LOCATIONS IMPACTED INCLUDE...
PARK VALLEY...ROSETTE AND LOCOMOTIVE SPRINGS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4198 11310 4168 11286 4166 11287 4151 11359
      4151 11364 4166 11378 4199 11323 4200 11312
TIME...MOT...LOC 2243Z 233DEG 32KT 4164 11358