1 flash flood, as filed by the National Weather Service.
Every event with a place to put it; 1 filed by county or forecast zone are drawn at its center, in a lighter ring. 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 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 22, 1:30 PM MST, 4 hours 45 minutes earlier.
UTAH AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SALT LAKE CITY UT 230 PM MDT FRI AUG 22 2003 .SYNOPSIS...A MOIST AND UNSTABLE AIRMASS WILL REMAIN OVER THE AREA TONIGHT. A DRIER WEST TO SOUTHWESTERLY FLOW WILL GRADUALLY SETTLE IN ACROSS THE NORTHWEST LATE TOMORROW AND INTO THE SOUTH BY LATE SUNDAY. .DISCUSSION...CIRCULATION CENTER NOW INTO WESTERN NEVADA CONTINUES TO LIFT RAPIDLY TO THE NORTHEAST. JET STREAM SLIDING INTO POSITION ACROSS NEVADA AND NORTHWEST UTAH AND ENHANCING THUNDERSTORMS DEVELOPING ALONG THE NEVADA/UTAH BORDER. ATMOSPHERE REMAINS QUITE MOIST AT THIS TIME AND THE POSSIBILITY OF SEVERE WEATHER WILL REMAIN THROUGH THE EVENING. SPC HAS NORTHWESTERN UTAH...WEST OF A LINE FROM THE NEVADA BORDER WEST OF CEDAR CITY TO KEMMERER WYOMING...UNDER A SLIGHT CHANCE FOR SEVERE THUNDERSTORMS THROUGH 12Z TOMORROW MORNING. THIS LOOKS REASONABLE THROUGH TONIGHT WITH THE THREAT DECREASING AFTER MIDNIGHT. FARTHER SOUTH AND EAST THE WINDS ALOFT HAVE INCREASED SIGNIFICANTLY ON THE NEW ETA RUN AND TO A LESSER EXTENT ON THE GFS. THIS WOULD DECREASE THE POSSIBILITY OF FLASH FLOODING...ALTHOUGH SATELLITE AND DOPPLER RADAR INDICATE THAT SOME TRAINING IS OCCURRING WITH THE THUNDERSTORMS AND THIS MAY STILL ALLOW ENOUGH PRECIPITATION TO SUPPORT LOCALIZED FLASH FLOODING. NEW GFS ALSO AGREES WITH THE ETA WITH RAPID DRYING AT 500MB AFTER 00Z OVER NORTHWEST UTAH AND AT 700MB AFTER 06Z. THIS WILL TEND TO DECREASE THUNDERSTORM ACTIVITY OVER THE NORTHWEST LATER THIS EVENING. THE TROUGH WILL CONTINUE TO LIFT OUT ACROSS NORTHERN UTAH THROUGH TOMORROW NIGHT LEAVING MUCH OF UTAH UNDER FAVORABLE LIFT FOR SCATTERED SHOWERS AND THUNDERSTORMS INTO TOMORROW EVENING. THE EXCEPTION MAY BE THE NORTHWEST CORNER WHERE DRYING IS FORECAST. AIRMASS CONTINUES TO DRY FROM THE NORTH SUNDAY AND ACROSS MOST OF THE STATE BY MONDAY MORNING. RIDGE DEVELOPS OFF THE CALIFORNIA COAST TURNING THE FLOW OVER UTAH TO THE NORTHWEST THROUGH WEDNESDAY MORNING. FLOW THEN TURNS BACK TO THE SOUTHWEST AND MOISTURE AGAIN BEGINS TO MOVE NORTHWARD INTO THE SOUTHERN PORTION OF THE AREA THROUGH THE REMAINDER OF THE WEEK. SHOWERS AND THUNDERSTORMS WILL ACCOMPANY THE MOISTURE BEGINNING MAINLY OVER THE SOUTH ON WEDNESDAY AND SPREADING NORTH INTO THURSDAY. SLC 6442 CDC 6553 YOUNG .SLC...FLASH FLOOD WATCH SOUTH CENTRAL UTAH UNTIL 10 PM TONIGHT.
IDZ024-025-UTZ001>021-WYZ021-231300- HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SALT LAKE CITY UT 605 AM MDT FRI AUG 22 2003 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE WESTERN TWO-THIRDS OF UTAH...EXTREME SOUTHEAST IDAHO AND EXTREME SOUTHWEST WYOMING .DAY ONE... TODAY DEEP MOISTURE AND INCREASING WINDS ALOFT OVER NORTHWESTERN THIRD OF UT AND SOUTHERN ID WILL LEAD TO STRONG THUNDERSTORMS THIS AFTERNOON THAT COULD PRODUCE HEAVY RAINFALL...HAIL...AND/OR DAMAGING WINDS. SLOWER MOVING THUNDERSTORMS OVER EASTERN PORTIONS WILL BE CAPABLE OF PRODUCING VERY HEAVY RAIN WHICH MAY PRODUCE FLASH FLOODING. .DAYS TWO THROUGH SEVEN... SATURDAY THROUGH THURSDAY DEEP MOISTURE WILL REMAIN OVER ALL BUT THE EXTREME NORTHWEST PORTION OF UT AND SOUTHERN ID SATURDAY. STRONG THUNDERSTORMS ARE EXPECTED OVER THE NORTHERN HALF OF UTAH AND SOUTHWEST WYOMING. FLASH FLOODING IS POSSIBLE OVER THE PORTIONS OF UTAH. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURE.
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
0317 PM MDT FRI AUG 22 2003
TIME(MDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0245 PM 29 WNW OGDEN UT 71 MPH TSTORM WIND
08/22/03 BOX ELDER GUNNISON ISLAND SITE
0245 PM 16 W OGDEN UT 81 MPH TSTORM WIND
08/22/03 BOX ELDER KMTX RADAR SITE
0230 PM 23 WSW OGDEN UT 87 MPH TSTORM WIND
08/22/03 TOOELE HAT ISLAND BUOY
0220 PM 10 S LEVAN UT TORNADO
08/22/03 JUAB REPORTED BY UTAH HIGHWAY
PATROL
0100 PM 40 ESE WENDOVER UT 72 MPH TSTORM WIND
08/22/03 TOOELE NUMEROUS STRONG WIND
REPORTS IN THE DUGWAY
MESONET
MCCThe Cedar City radar (KICX), 92 km away, was scanning. The volume nearest the first event began at 01:16 UTC.
1 flash flood. Local standard time, as filed.
Flash flooding occurred in Johnson Canyon just east of Kanab, washing out a bridge and creating some road damage.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Utah in 2003Every state in 2003This day in weather historyWarnings in Utah, August 2003
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: 5380054.