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 Sep 2, 3:20 PM MST, 1 hour 25 minutes earlier.
UTAH AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SALT LAKE CITY UT 420 PM MDT TUE SEP 2 2003 .SYNOPSIS...A WEAKENING UPPER LEVEL TROUGH WILL MOVE ACROSS NORTHERN UTAH THIS EVENING. IN ITS WAKE HIGH PRESSURE WILL REBUILD ON WEDNESDAY BRINGING SOME DRYING TO THE NORTH AND EVENTUALLY TO THE SOUTH BY WEDNESDAY NIGHT. THE HIGH WILL SHIFT EAST THURSDAY ALLOWING MOISTURE TO MOVE BACK UP FROM THE SOUTH. .DISCUSSION...UPPER LEVEL LOW MOVING SLOWLY SOUTHEAST INTO NORTHWEST UTAH THIS EVENING. BANKING ON THIS TO DESTABILIZE ATMOSPHERE ACROSS NORTHERN UTAH THIS EVENING SO HAVE KEPT POPS FROM EARLIER PACKAGE PRETTY MUCH IN LINE. SOUTHERN UTAH LIGHTING UP NICELY AS WEAK DEFORMATION ZONE LIES ACROSS THIS REGION. PWS REMAIN HIGH INTO WEDNESDAY AFTERNOON AND WITH LIGHT FLOW HAVE KEPT THE CHANCE OF THUNDERSTORMS AND THE POSSIBLITIY OF FLASH FLOODING AT MODERATE. HAD RADAR ESTIMATES OF OVER 2 INCHES THIS AFTERNOON SO FEEL MOISTURE WILL STILL BE PRESENT TOMORROW. HIGH AND DRY WEDNESDAY UNDER NORTHERLY FLOW. MOST OF THE STATE SHOULD REMAIN DRY THROUGH THURSDAY. ALTHOUGH RIDGE POSITION REMAINS OVER AREA FOR FRIDAY INTO SATURDAY A BROAD WEAK DIFFLUENT AREA DEVELOPS OVER THE ENTIRE CWA FOR AT LEAST PARTLY CLOUDY SKIES IF NOT CLOUDY...BUT WILL WAIT ON GOING SO FAR. NOT MUCH LIFT ASSOCIATED WITH SYSTEM SO KEPT POPS LOW. RIDGE STRENGTHENS FOR SUNDAY SO WARMER AND CLEARER SKIES. LATEST RUN OF GFS IS BACKING OFF ON STRENGTH OF TROUGH FOR EARLY NEXT WEEK. THIS IDEA LOOKS GOOD SO HAVE BACKED OFF ON THE COOLING SOMEWHAT FOR MONDAY AND TUESDAY. SYSTEM APPEARS TO BE DRY FOR MOST OF STATE. SLC 3000 CDC 3101 STRUTHWOLF .SLC...NONE.
IDZ024-025-UTZ001>021-WYZ021-031300- HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SALT LAKE CITY UT 800 AM MDT TUE SEP 2 2003 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE WESTERN TWO-THIRDS OF UTAH...EXTREME SOUTHEAST IDAHO AND EXTREME SOUTHWEST WYOMING .DAY ONE... TODAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN... WEDNESDAY THROUGH MONDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.
The Cedar City radar (KICX), 66 km away, was scanning. The volume nearest the first event began at 23:44 UTC.
1 flash flood. Local standard time, as filed.
Heavy rains falling on Slickrock caused flash flooding in Zion National Park. A landslide occurred near the east entrance tunnel, blocking the road. Flash flooding also occurred on Pine Creek and near the Watchman Campground.
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, September 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: 5327869.