Severe thunderstorms occurred across primarily northern Utah at the end of the month, producing strong wind gusts.
Every event with a place to put it. Tap one for its entry below.
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.
Severe thunderstorms occurred across primarily northern Utah at the end of the month, producing strong wind gusts.
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 Aug 30, 1:53 PM MST, 2 hours 2 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SALT LAKE CITY UT 253 PM MDT THU AUG 30 2012 .SYNOPSIS...MOISTURE WILL INCREASE ACROSS THE AREA THROUGH THE END OF THE WEEK. A GRADUAL DRYING TREND WILL DEVELOP ACROSS MAINLY THE NORTHERN HALF OF UTAH OVER THE UPCOMING HOLIDAY WEEKEND. && .DISCUSSION...A DEEP LAYER SOUTH TO SOUTHWESTERLY FLOW CONTINUES TO PUMP MOISTURE NORTHWARD ACROSS THE FORECAST AREA THIS AFTERNOON. THIS MOISTURE IS AIDING IN SHOWERS AND THUNDERSTORMS...MOST NUMEROUS ACROSS EAST CENTRAL UT AND WEST CENTRAL NV WITHIN A BROAD MID LEVEL CONVERGENCE AXIS. ANTICIPATE THIS ACTIVITY TO DEVELOP NORTHEAST OVER THE NEXT FEW HOURS SPREADING INTO THE WASATCH FRONT BY EARLY EVENING...WHILE ADDITIONAL CONVECTION CONTINUES ACROSS CENTRAL AND SOUTHERN UT. LITTLE CHANGE IS FORECAST IN THE OVERALL PATTERN THROUGH FRIDAY...AS MOISTURE REMAINS PLENTIFUL ACROSS MOST OF THE FORECAST AREA...ALLOWING FOR SCATTERED AFTERNOON AND EVENING SHOWERS AND THUNDERSTORMS. A TROUGH FORECAST TO EJECT ACROSS THE NORTHERN ROCKIES SATURDAY WILL PUSH DRIER AIR INTO NORTHERN UT SATURDAY NIGHT THROUGH SUNDAY WHILE MOISTURE REMAINS ACROSS THE SOUTH. GFS AND EC DIFFER GREATLY EARLY NEXT WEEK...PRIMARILY WITH RESPECT THE TRACK OF HURRICANE ILEANA IN THE EASTERN PACIFIC...AND HOW MUCH IF ANY MOISTURE MAKES ITS WAY NORTHWARD ACROSS THE FORECAST AREA. GIVEN THIS UNCERTAINTY HAVE TRENDED POPS CLOSER TO CLIMO DURING THE DAY 4-7 PERIOD. && .AVIATION....WINDS AT THE KSLC TERMINAL ARE EXPECTED TO PREVAIL FROM THE NORTHWEST FOR THE NEXT SEVERAL HOURS AS SHOWERS REMAIN NORTHWEST OF THE AIRFIELD. THIS SAID...SHOWERS AND STORMS ARE EXPECTED TO GRADUALLY WORK IN FROM THE SOUTH AND WEST AROUND 00Z...BRINGING A 60 PERCENT CHANCE OF VARIABLE AND GUSTY OUTFLOW WINDS. ADDITIONALLY A 20 PERCENT CHANCE EXISTS THAT A THUNDERSTORM WILL DIRECTLY IMPACT THE TERMINAL. && .FIRE WEATHER...A SYSTEM APPROACHING THE PACIFIC NORTHWEST WILL HELP TO DRAW MOISTURE NORTHWARD ACROSS MUCH OF THE DISTRICT THROUGH SATURDAY. AS HIGH PRESSURE PUSHES EASTWARD...DRIER CONDITIONS WILL MOVE INTO THE NORTHERN HALF OF THE DISTRICT SUNDAY. THERE ARE DISCREPANCIES BETWEEN THE LONGER RANGE MODELS EARLY NEXT WEEK REGARDING THE DEGREE OF MOISTURE THAT IS EXPECTED TO REMAIN ACROSS MAINLY CENTRAL AND SOUTHERN UTAH...GIVING THIS PORTION OF THE FORECAST A LOWER CONFIDENCE FACTOR THAN USUAL. && .SLC WATCHES/WARNINGS/ADVISORIES... UT...NONE. WY...NONE. && PUBLIC... FIRE WEATHER... AVIATION... 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 325 PM MDT THU AUG 30 2012 UTZ001>016-019>021-517-518-WYZ021-311200- 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- 325 PM MDT THU AUG 30 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE WESTERN TWO THIRDS OF UTAH AND SOUTHWEST WYOMING. .DAY ONE...THIS AFTERNOON AND TONIGHT SCATTERED SHOWERS AND THUNDERSTORMS WILL CONTINUE THROUGH THE EVENING HOURS. A FEW OF THE STRONGER THUNDERSTORMS COULD PRODUCE LOCALLY HEAVY RAIN ACROSS SOUTHWEST THROUGH CENTRAL UTAH. SHOWERS AND STORMS WILL DECREASE ACROSS THE ENTIRE OUTLOOK AREA LATE THIS EVENING. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY DEEP LAYER MOISTURE WILL REMAIN ACROSS THE OUTLOOK AREA THROUGH AT LEAST SATURDAY. SCATTERED AFTERNOON THROUGH EARLY EVENING SHOWERS AND THUNDERSTORMS ARE EXPECTED FOR BOTH FRIDAY AND SATURDAY. SOME OF THE STRONGER STORMS WILL BE CAPABLE OF PRODUCING LOCAL HEAVY RAIN WITH A THREAT OF ISOLATED FLASH FLOODING IN THE FLOOD PRONE AREAS OF SOUTHWEST AND CENTRAL UTAH. DRIER AIR WILL GRADUALLY WORK INTO THE NORTHERN PORTIONS OF UTAH AND SOUTHWEST WYOMING SUNDAY. LINGERING MOISTURE ACROSS SOUTHERN AND CENTRAL UTAH WILL FUEL ADDITIONAL SHOWERS AND THUNDERSTORMS EARLY NEXT WEEK...THOUGH THE AREAL COVERAGE WILL DECREASE HEADING INTO THE MIDWEEK PERIOD. .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 TRAVEL IMPACTS VISIT... HTTP://WWW.UDOTTRAFFIC.UTAH.GOV/ROADWEATHERFORECAST.ASPX
The Salt Lake City radar (KMTX), 134 km away, was scanning. The volume nearest the first event began at 22:55 UTC.
3 thunderstorm wind. Local standard time, as filed.
The Camel Back Mountain sensor in the Dugway Proving Ground mesonet recorded a maximum wind gust of 59 mph.
A large line of thunderstorms moved into far western Utah on the evening of August 31st, bringing severe wind gusts. Peak recorded gusts included 72 mph at Wendover Airport, 61 mph at Wendover Peak, and 58 mph at the North Salt Flats sensor.
A line of thunderstorms intensified as it reached the Great Salt Lake, with peak recorded wind gusts of 78 mph at the I-80 at Grassey sensor, 67 mph at Lakeside Mountain, 65 mph at Hat Island, and 62 mph at the Eagle Range sensor.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Utah in 2012Every state in 2012This day in weather historyWarnings in Utah, August 2012
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: 409091, 409092, 409641.