Strong thunderstorms developed across far northwest Utah on October 1, producing severe wind gusts. The thunderstorms that developed on October 2 had access to more moisture, producing some flash flooding along the Wasatch Front.
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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.
Strong thunderstorms developed across far northwest Utah on October 1, producing severe wind gusts. The thunderstorms that developed on October 2 had access to more moisture, producing some flash flooding along the Wasatch Front.
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 Oct 1, 8:46 PM MST, 4 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SALT LAKE CITY UT 946 PM MDT THU OCT 1 2015 .SYNOPSIS...A PACIFIC STORM SYSTEM WILL MOVE ACROSS UTAH AND SOUTHWEST WYOMING TONIGHT THROUGH TOMORROW NIGHT. A SECOND STORM SYSTEM WILL FOLLOW FOR EARLY NEXT WEEK. && .DISCUSSION...PACIFIC TROUGH CURRENTLY CENTERED OVER CENTRAL NEVADA THIS EVENING. ASSOCIATED COLD FRONT HAS MOVED INTO WESTERN UTAH...PRODUCING SCATTERED SHOWERS AND THUNDERSTORMS AND SOME GUSTY WINDS OVER THE NORTHWEST DESERTS AS IT PASSES THROUGH. SOME ADDITIONAL CONVECTION HAS DEVELOPED OVER THE NORTHERN MOUNTAINS IN MOISTURE AND INSTABILITY AHEAD OF THE SYSTEM. THE TROUGH WILL TRACK SLOWLY EAST OVERNIGHT...WITH THE FRONT APPROACHING THE WASATCH FRONT BY ABOUT SUNRISE. SHOWERS WILL INCREASE IN COVERAGE OVER PRIMARILY NORTHERN UTAH AND SOUTHWEST WYOMING THROUGH THE MORNING AND AFTERNOON AS THE SYSTEM MOVES ACROSS THE AREA. 700 MB TEMPS ARE PROGGED TO COOL ABOUT 10C BEHIND THE FRONT...ALLOWING FOR MAXES TOMORROW TO BE 20F COOLER THAN TODAY OVER NORTHERN UTAH AND IN EXCESS OF 10F COOLER OVER SOUTHERN UTAH. SNOW LEVELS DROP AS LOW AS ABOUT 10K FEET BY TOMORROW AFTERNOON...SO PRECIPITATION WILL FALL AS RAIN IN MOST LOCATIONS. PRECIPITATION WILL TEND TO DIMINISH FRIDAY NIGHT/EARLY SATURDAY AS THE TROUGH EXITS...BUT LINGERING MOISTURE WILL KEEP A THREAT OF SHOWERS FOR THE HIGHER TERRAIN THROUGH THE WEEKEND. ANOTHER UPPER LOW WILL MOVE ACROSS CALIFORNIA SATURDAY AND SUNDAY BEFORE SHIFTING EAST TO MOVE ACROSS ARIZONA AND SOUTHERN UTAH EARLY NEXT WEEK...RESULTING IN MORE UNSETTLED WEATHER. UPDATED THE FORECAST EARLIER TO INCREASE POPS OVER THE MOUNTAINS AND MOUNTAIN VALLEYS OF NORTHERN UTAH GIVEN CURRENT RADAR TRENDS. NO ADDITIONAL UPDATES EXPECTED TO THE FORECAST THIS EVENING. && .AVIATION...A COLD FRONT IS EXPECTED TO CROSS THE SLC TERMINAL AROUND 12-15Z FRIDAY MORNING. THIS FRONT WILL SHIFT WINDS TO THE WEST TO NORTHWEST...WITH A BRIEF PERIOD OF GUSTY WINDS IMMEDIATELY BEHIND THE FRONT. THE ONE COMPLICATION IS WHETHER ENOUGH PRECIPITATION WILL FORM IN THE PRE-FRONTAL ENVIRONMENT TO SHIFT WINDS EARLIER TO THE WEST/NORTHWEST...WHICH MAY SHIFT WINDS CLOSER TO 09-11Z. PRECIP ALONG AND BEHIND THE FRONT WILL BRING CEILINGS DOWN TO AROUND 7 KFT FRIDAY MORNING. && .FIRE WEATHER...A PACIFIC TROUGH AND ITS ASSOCIATED COLD FRONT HAVE MOVED INTO WESTERN UTAH THIS EVENING AND WILL SWEEP ACROSS THE STATE TONIGHT AND TOMORROW. SIGNIFICANTLY COOLER TEMPS WILL TRAIL THE COLD FRONT...WITH FAIRLY WIDESPREAD PRECIP CONFINED TO THE NORTHERN AND CENTRAL PORTIONS OF THE STATE. WETTING RAINS ARE EXPECTED...MAINLY ACROSS THE NORTHERN FIRE DISTRICTS. A SECOND STORM SYSTEM MOVING SOUTH ALONG THE WEST COAST DURING THE LATTER HALF OF THE WEEKEND WILL TURN EAST AND MOVE ACROSS THE DESERT SOUTHWEST/SOUTHERN GREAT BASIN DURING THE FIRST HALF OF NEXT WEEK. THE LATEST MODEL GUIDANCE INDICATES THAT IMPACTS IN TERMS OF PRECIP WILL FOCUS MORE ACROSS SOUTHERN AND CENTRAL UTAH WITH THIS SECOND STORM. TEMPS ACROSS ALL FIRE DISTRICTS WILL REMAIN AT TO BELOW NORMAL WITH FAIRLY HIGH HUMIDITIES EXPECTED. && .SLC WATCHES/WARNINGS/ADVISORIES... UT...NONE. WY...NONE. && TRAPHAGAN/STRUTHWOLF 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 540 AM MDT THU OCT 1 2015 UTZ001>016-019>021-517-518-WYZ021-021300- 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- 540 AM MDT THU OCT 1 2015 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE WESTERN TWO THIRDS OF UTAH AND SOUTHWEST WYOMING. .DAY ONE...TODAY AND TONIGHT INCREASING SOUTH WINDS TODAY COULD BRING LOCALIZED CRITICAL FIRE WEATHER CONDITIONS TO AREAS WHERE FUELS ARE DRY. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY A STORM SYSTEM WILL PUSH A COLD FRONT THROUGH UTAH ON FRIDAY. TEMPERATURES WILL FALL SIGNIFICANTLY FOR FRIDAY AND SATURDAY BEHIND THIS FRONT. WIDESPREAD PRECIPITATION IS EXPECTED ACROSS NORTHERN UTAH AND SOUTHWEST WYOMING ON FRIDAY...WITH SNOW LEVELS REACHING THE HIGHER PEAKS. ANOTHER COOL STORM SYSTEM IS EXPECTED FOR MONDAY AND TUESDAY. .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 Salt Lake City radar (KMTX), 180 km away, was scanning. The volume nearest the first event began at 03:51 UTC.
4 thunderstorm wind, 3 flash flood. Local standard time, as filed.
The Callao sensor in the Dugway Proving Ground mesonet recorded a peak wind gust of 61 mph.
The Causeway sensor in the Dugway Proving Ground mesonet recorded a maximum wind gust of 66 mph.
A peak wind gust of 64 mph was recorded at the West Salt Flats sensor in the Dugway Proving Ground mesonet.
A 72 mph wind gust was recorded at the North Salt Flats sensor in the Dugway Proving Ground mesonet.
Flash flooding was reported in Lehi, with some flooded residential roadways. In addition, approximately six homes sustained flood damage, primarily to basements.
Heavy rain brought road, parking lot, and basement flooding to the Sugarhouse and Foothill areas of Salt Lake City. The flooding damaged multiple streets including Roxberry Road, Sherwood Drive, and 1300 South near 2500 East. There was also a significant amount of water on Foothill Drive, particularly near 2200 South. Approximately six homes also experienced basement flooding across the area.
Heavy rain brought road, parking lot, and basement flooding to the Sugarhouse and Foothill areas of Salt Lake City. The flooding damaged multiple streets including Roxberry Road, Sherwood Drive, and 1300 South near 2500 East. There was also a significant amount of water on Foothill Drive, particularly near 2200 South. Approximately six homes also experienced basement flooding across the area.
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, October 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: 605432, 605433, 605434, 605435, 605740, 605732, 605744.