Another fall-like storm moved into Utah in mid August. Showers and thunderstorms with this system caused strong gusty winds across the state.
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.
Another fall-like storm moved into Utah in mid August. Showers and thunderstorms with this system caused strong gusty winds across the state.
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 13, 2:52 PM MST, 28 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SALT LAKE CITY UT 352 PM MDT THU AUG 13 2009 .SYNOPSIS...SOUTHWEST FLOW WILL RESULT IN BREEZY WINDS TOMORROW AS DRIER AIR MOVES INTO WESTERN UTAH. A PACIFIC STORM SYSTEM WILL CROSS THE NORTHERN ROCKIES FRIDAY AND SATURDAY SENDING A COLD FRONT THROUGH THE AREA. && .DISCUSSION...A MOIST AIRMASS REMAINS OVER MOST OF THE FORECAST AREA TODAY UNDER SOUTHWEST FLOW ALOFT. SATELLITE ESTIMATES INDICATE SLIGHT DRYING OVER NORTHWEST UTAH...WHICH HAS SUPPRESSED ACTIVITY. HOWEVER...SCATTERED SHOWERS AND THUNDERSTORMS HAVE DEVELOPED OVER THE HIGH TERRAIN...PARTICULARLY OVER SOUTHERN UTAH. TEMPERATURES ARE GENERALLY RUNNING RIGHT AROUND SEASONAL NORMS OVER THE SOUTH...AND A FEW DEGREES ABOVE THOSE VALUES OVER NORTHERN UTAH. DRIER AIR WILL CONTINUE TO MOVE IN FROM THE WEST OVERNIGHT...SO CONVECTION TOMORROW WILL GENERALLY BE LIMITED TO THE EASTERN HALF OF THE CWA. AS THE TROUGH OVER THE PACIFIC NORTHWEST APPROACHES THE AREA...SOUTHWEST FLOW WILL INCREASE...ALLOWING FOR AT LEAST BREEZY WINDS OVER THE REGION. OVER WESTERN UTAH...THE AIRMASS WILL BE DRY ENOUGH TO RESULT IN SEVERE FIRE WEATHER CONDITIONS. SEE THE FIRE WEATHER SECTION OF THE AFD FOR MORE DETAILS. MODELS CONTINUE TO AGREE THAT THE TROUGH WILL BRING AN UNSEASONABLY STRONG COLD FRONT THROUGH THE AREA FRIDAY NIGHT AND SATURDAY. FRONTAL PASSAGE SHOULD INITIALLY BE DRY...BUT AS THE MAIN TROUGH MOVES ACROSS NORTHERN UTAH DURING THE DAY SATURDAY...IT SHOULD HAVE ENOUGH MOISTURE AND DYNAMICS WITH IT TO PRODUCE SOME PRECIP. THE TROUGH LOOKS TO EXIT BY EARLY SUNDAY...BUT THE COOLER TEMPERATURES WILL REMAIN. MAXES SATURDAY AND SUNDAY ARE EXPECTED TO RUN AT LEAST 15F BELOW CLIMO OVER NORTHERN UTAH...AND 5-10F BELOW CLIMO OVER THE SOUTH. EC/GFS APPEAR TO BE COMING INTO BETTER AGREEMENT AFTER SUNDAY. 00Z ECMWF INDICATED THAT UNSETTLED WEATHER WOULD PERSIST INTO EARLY NEXT WEEK DUE TO A HANG BACK TROUGH...BUT THIS FEATURE IS VERY WEAK IN THE 12Z RUN...MORE LIKE THE GFS THAT DOES NOT HAVE THE FEATURE. NOW THE MODELS BOTH SHOW A DRYING AND WARMING TREND FROM MONDAY THROUGH NEAR THE END OF THE FORECAST PERIOD AS HIGH PRESSURE REDEVELOPS. MODELS HAVE NOT BEEN TERRIBLY CONSISTENT...HOWEVER...SO HAVE LEFT SOME TOKEN POPS IN FOR MOST OF THE EXTENDED. && .AVIATION...THE LAKE BREEZE HAS JUST MOVED SOUTH THROUGH THE KSLC TERMINAL SWITCHING WINDS TO THE NORTHWEST. IT IS EXPECTED THAT NORTHWEST WINDS WILL PREVAIL FOR THE REMAINDER OF THE AFTERNOON AS A RESULT. ADDITIONAL CUMULUS BUILDUPS ARE LIKELY THROUGH EARLY THIS EVENING OVER THE OQUIRRH MOUNTAINS...YIELDING A 20 PERCENT CHANCE THAT OUTFLOW WINDS WILL SWITCH WINDS BACK TO THE SOUTH PRIOR TO 03Z. && .FIRE WEATHER...THE COLD UPPER LEVEL TROUGH ENTERING THE PACIFIC NW WILL GENERATE A DRY AND STRONG SW FLOW ACROSS UTAH FRIDAY. HAZARDOUS FIRE WEATHER CONDITIONS WILL RESULT FROM THE WINDS/LOW RH FRIDAY AFTERNOON AND EVENING ACROSS MOST WRN VALLEYS. THE UPPER TROUGH WILL MOVE EAST ACROSS THE NRN ROCKIES AND NRN GREAT BASIN FRIDAY NIGHT THROUGH SATURDAY. THE COLD FRONT ASSOCIATED WITH THIS TROUGH WILL ENTER NW UTAH BY FRIDAY EVENING...THEN SWEEP SOUTH ACROSS UTAH LATE FRIDAY NIGHT/SATURDAY. PRECIPITATION WILL BE LIMITED WITH THIS FRONT...AND MAINLY CONFINED TO THE FAR NORTH. SIGNIFICANTLY COOLER TEMPERATURES WILL FOLLOW THIS FRONT...AND REMAIN THROUGH THE WEEKEND. && .SLC WATCHES/WARNINGS/ADVISORIES... UT...RED FLAG WARNING FROM NOON FRIDAY TO MIDNIGHT SATURDAY FOR UTAH FIRE WEATHER ZONE 420. RED FLAG WARNING FROM NOON FRIDAY TO 9 PM FRIDAY FOR UTAH FIRE WEATHER ZONES 434...435...AND 439. WY...NONE. && PUBLIC...TRAPHAGAN FIRE WEATHER...CONGER AVIATION...MERRILL FOR MORE INFORMATION FROM NOAA/S NATIONAL WEATHER SERVICE VISIT... HTTP://WEATHER.GOV/SALTLAKECITY (ALL LOWER CASE)
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SALT LAKE CITY UT 446 AM MDT THU AUG 13 2009 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- 446 AM MDT THU AUG 13 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE WESTERN TWO THIRDS OF UTAH AND SOUTHWEST WYOMING. .DAY ONE...TODAY AND TONIGHT INCREASING MOISTURE WILL RESULT IN THUNDERSTORMS WITH BRIEF HEAVY RAIN ACROSS THE SOUTHEAST TODAY. ELSEWHERE ACROSS THE AREA...ISOLATED HIGH-BASED THUNDERSTORMS COULD RESULT IN GUSTY WINDS. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY SOUTH TO SOUTHWEST WINDS WILL INCREASE ACROSS MUCH OF THE AREA FRIDAY AHEAD OF AN APPROACHING STORM SYSTEM. DRIER AIR SPREADING INTO WESTERN UTAH WILL COMBINE WITH THE WINDS TO RESULT IN SEVERE FIRE WEATHER CONDITIONS. THE STORM SYSTEM WILL PUSH A COLD FRONT INTO NORTHERN AND CENTRAL UTAH FRIDAY NIGHT...USHERING IN MUCH COOLER TEMPERATURES FOR THE WEEKEND. .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)
The Salt Lake City radar (KMTX), 125 km away, was scanning. The volume nearest the first event began at 22:21 UTC.
5 thunderstorm wind, 1 high wind. Local standard time, as filed.
The West of Wildcat Mountain sensor in the Dugway mesonet recorded a wind gust of 60 mph.
A maximum wind gust of 62 mph was recorded by the sensor at I-15 at Tremonton.
Virga caused severe wind gusts, with a 78 mph gust recorded at the Causeway sensor and a 59 mph gust recorded at the I-80 at Grassy sensor.
The Great Salt Lake sensor recorded a wind gust of 65 mph.
The Wasatch Hills sensor recorded a maximum wind gust of 60 mph.
The Mount Baldy sensor at Deer Valley recorded a wind gust of 59 mph.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Utah in 2009Every state in 2009This day in weather historyWarnings in Utah, August 2009
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: 192675, 192676, 193251, 192677, 192791, 192792.