Widely scattered thunderstorms formed across southwest Utah on September 13, and a severe wind gust was recorded with one storm.
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Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS SLC wrote it up.
Widely scattered thunderstorms formed across southwest Utah on September 13, and a severe wind gust was recorded with one storm.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Salt Lake City, UT wrote its last area forecast discussion before the first event at Sep 13, 9:40 AM MST, 3 hours 45 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SALT LAKE CITY UT 1040 AM MDT SUN SEP 13 2015 .SYNOPSIS...HIGH PRESSURE OVER THE AREA WILL BREAK DOWN TODAY ALLOWING MOISTURE TO SPREAD INTO SOUTHWEST UTAH THIS AFTERNOON. THIS MOISTURE WILL SPREAD ACROSS THE REST OF THE AREA MONDAY AND REMAIN OVER THE REGION THROUGH MID WEEK. SEVERAL DISTURBANCES WILL BRING A COOL AND UNSETTLED PERIOD TO THE AREA THROUGH MID WEEK. && .DISCUSSION...DOMINANT RIDGE THAT HAS BEEN IN PLACE OVER UTAH FOR PAST WEEK WILL SLOWLY MIGRATE EASTWARD TODAY AS A WEAK DISTURBANCE OVER NORTHERN CALIFORNIA MOVES EASTWARD. THE LEADING EDGE OF THE DEFORMATION ZONE AHEAD OF THIS DISTURBANCE WILL MOVE INTO SOUTHWEST UTAH THIS AFTERNOON BUT THE AIR MASS IS STILL RELATIVELY DRY SO ANY CONVECTION THAT DEVELOPS WILL LIKELY BE OF THE DRY VARIETY WITH GUSTY WINDS. THE AIR MASS MOISTENS UP THIS EVENING WITH THE PASSAGE OF THE DEFORMATION ZONE SO EXPECT THE SHOWERS AND THUNDERSTORMS TO BE WET AND INCREASE IN COVERAGE. THE CURRENT FORECAST LOOKS GOOD THERE. HAVE ADDED A SLIGHT CHANCE OF THUNDERSTORMS IN THE EXTREME NORTHWEST CORNER OF THE CWA THIS AFTERNOON AS THE NOSE OF A WEAK JET WILL MOVE INTO THAT AREA. LIFTED INDEX SHOW SOME MINUS 1-2 AND THE NCAR ENSEMBLE FORECAST SHOW SOME RADAR REFLECTIVITY TO BE PRESENT THERE AFTER 22Z. && .AVIATION...SOUTHEAST WINDS AT THE SLC TERMINAL ARE EXPECTED TO SHIFT TO NORTHWEST AT 20Z. HOWEVER...THERE IS A 30 PERCENT CHANCE THAT THE WINDS WILL SHIFT BY 19Z. VFR CONDITIONS WILL PREVAIL THROUGH THIS EVENING. && .SLC WATCHES/WARNINGS/ADVISORIES... UT...NONE. WY...&& PUBLIC...STRUTHWOLF 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 425 AM MDT SUN SEP 13 2015 UTZ001>016-019>021-517-518-WYZ021-141200- 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- 425 AM MDT SUN SEP 13 2015 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE WESTERN TWO THIRDS OF UTAH AND SOUTHWEST WYOMING. .DAY ONE...TODAY AND TONIGHT GUSTY WINDS AND LOW RELATIVE HUMIDITIES WILL PRODUCE CRITICAL FIRE WEATHER CONDITIONS OVER EXTREME SOUTHWEST WYOMING THIS AFTERNOON AND EVENING. MOISTURE SPREADING NORTH INTO SOUTHERN UTAH THIS AFTERNOON WILL BRING SCATTERED SHOWERS AND THUNDERSTORMS TO SOUTHWEST UTAH LATE DAY. THIS SHOWER AND THUNDERSTORM ACTIVITY WILL SPREAD NORTH INTO CENTRAL UTAH OVERNIGHT. THE LEADING EDGE OF THIS MOISTURE MAY SUPPORT THUNDERSTORMS WITH LITTLE RAINFALL BUT DRY MICROBURST WINDS AND LIGHTNING...INCREASING THE THREAT OF CRITICAL FIRE WEATHER CONDITIONS FOR A BRIEF PERIOD THIS EVENING INTO THE OVERNIGHT HOURS. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY UNSETTLED WEATHER WILL CONTINUE ACROSS MUCH OF THE OUTLOOK AREA THROUGH MIDWEEK. THE BEST CHANCE FOR SIGNIFICANT RAINFALL WILL EXIST ACROSS WESTERN AND NORTHERN UTAH TUESDAY...THEN MAINLY OVER NORTHERN UTAH AND SOUTHWEST WYOMING TUESDAY NIGHT THROUGH WEDNESDAY. .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
The Cedar City radar (KICX), 92 km away, was scanning. The volume nearest the first event began at 20:24 UTC.
1 thunderstorm wind. Local standard time, as filed.
The Brimstone Reservoir RAWS recorded a peak wind gust of 58 mph.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Utah in 2015Every state in 2015This day in weather historyWarnings in Utah, September 2015
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 602094.