1 lightning, 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 29, 9:10 AM MST, 1 hour 50 minutes earlier.
UTAH AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SALT LAKE CITY UT 1010 AM MDT FRI AUG 29 2003 .SYNOPSIS...AN UPPER LEVEL WEATHER DISTURBANCE WILL MOVE INTO NORTHERN UTAH TODAY...AND LINGER INTO SATURDAY. ANOTHER VERY WEAK DISTURBANCE WILL CROSS SOUTHERN UTAH LATE IN THE WEEKEND. .DISCUSSION...SITUATION SHAPING UP FOR ACTIVE CONVECTION ACROSS THE NRN HALF OF THE FORECAST AREA THROUGH AT LEAST THIS EVENING. THE DRIVING FORCE FOR THIS CONVECTION WILL BE THE UPPER LOW APPROACHING SW IDAHO LATE THIS MORNING. THIS FEATURE WILL MOVE INTO NW UT/SE ID LATER THIS AFTERNOON...THEN LINGER OVER SW WY/NE UT TONIGHT AND THROUGH MUCH OF SATURDAY. A VORTICITY LOBE ROTATING NE OUT AHEAD OF THE MAIN LOW TRIGGERING SHOWERS/STORMS ACROSS NW UT THIS MORNING. THIS ACTIVITY COULD FADE ONLY BRIEFLY IN THE WAKE OF THE VORTICITY LOBE AS IT ROTATES E-NE OUT OF THE AREA EARLY THIS AFTERNOON. THE MAIN ACTION SHOULD ASSOCIATE WITH THE UPPER LOW LATER THIS AFTERNOON/EVENING. A WEAK SURFACE BOUNDARY STALLED OVER THE NW DESERT THIS MORNING WILL BEGIN TO MOVE SE SHORTLY AS IT PHASES WITH THE UPPER LEVEL BAROCLINIC ZONE SAGGING SOUTH THROUGH EXTREME NW UT. COMBINE THIS LOW-LEVEL LIFT WITH THE DYNAMICS FROM THE APPROACHING LOW AND GOOD MOISTURE AND WIDESPREAD PRECIP A GOOD BET. ADD TO THIS DECENT SHEAR BETWEEN 850-400 MB ALONG SOME JET SUPPORT EARLY THIS EVENING...AND THE POTENTIAL FOR STRONG THUNDERSTORMS WITH HAIL COME INTO THE MIX. WILL UPDATE THE NRN ZONES TO UP THE THREAT OF PRECIP A BUT TODAY... OTHERWISE THE TRENDS LOOK GOOD IN THE EARLY MORNING PACKAGE. SLC 673 CDC 330 CONGER .SLC...NONE.
IDZ024-025-UTZ001>021-WYZ021-2301300- HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SALT LAKE CITY UT 600 AM MDT FRI AUG 29 2003 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE WESTERN TWO-THIRDS OF UTAH...EXTREME SOUTHEAST IDAHO AND EXTREME SOUTHWEST WYOMING .DAY ONE... TODAY STRONG THUNDERSTORMS ARE POSSIBLE OVER NORTHWEST UTAH THIS AFTERNOON AND EVENING. SOME OF THESE MAY PRODUCE DAMAGING WIND GUSTS AND LARGE HAIL. .DAYS TWO THROUGH SEVEN... SATURDAY THROUGH THURSDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURE.
IDZ024-025-UTZ001>011-023-024-WYZ021-292100- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SALT LAKE CITY UT 1038 AM MDT FRI AUG 29 2003 ...STRONG THUNDERSTORMS POSSIBLE THIS AFTERNOON AND EVENING... A MOIST AND UNSTABLE AIR MASS OVER THE STATE TODAY WILL INTERACT WITH AN UPPER LEVEL DISTURBANCE MOVING ACROSS THE REGION THIS AFTERNOON AND EVENING. THIS WILL PROVIDE A FAVORABLE ENVIRONMENT FOR THE DEVELOPMENT OF ISOLATED STRONG THUNDERSTORMS THIS AFTERNOON AND EARLY THIS EVENING. STRONG THUNDERSTORMS MAY PRODUCE DAMAGING WIND... HAIL...VERY HEAVY RAIN...AND DEADLY LIGHTNING. THE GREATEST POTENTIAL FOR STRONG STORMS WILL BE IN THE NORTHWESTERN PORTION OF THE STATE. EVERYONE IN THESE AREAS IS URGED TO MAINTAIN A HEIGHTENED AWARENESS OF THE WEATHER TODAY. MONITOR YOUR FAVORITE SOURCE OF WEATHER INFORMATION FOR THE LATEST UPDATES AND FOR ANY SEVERE WEATHER WATCHES OR WARNINGS. HALL
The Salt Lake City radar (KMTX), 143 km away, was scanning. The volume nearest the first event began at 18:00 UTC.
1 lightning. Local standard time, as filed.
A 26-year-old hiker was seriously injured after being struck by lightning high on Mt. Timpanogos. He was struck in the head, and the bolt exited his left ankle.
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: 5327788.