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 Jul 30, 9:50 AM MST, 3 hours 10 minutes earlier.
UTAH AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SALT LAKE CITY UT 1050 AM MDT WED JUL 30 2003 .SYNOPSIS...HIGH PRESSURE ALOFT ACROSS THE INTERMOUNTAIN REGION WILL SLOWLY SHIFT EAST OVER THE NEXT COUPLE OF DAYS. A MOIST AND UNSTABLE AIRMASS OVER EXTREME SOUTHERN UTAH TODAY WILL WORK SLOWLY NORTHWARD ON THURSDAY. .DISCUSSION...SIGNIFICANT DIFFERENCES IN MODELS THIS MORNING ON HOW FAST THE MEAN LOWER LEVEL RIDGE AXIS SHIFTS NORTHWARD ACROSS NRN UT AND ALLOWS MOISTURE TO SPREAD INTO THE NORTH. ETA HOLDS A NW-SE ORIENTED AXIS ALONG ABOUT A KENV-KPUC LINE THROUGH TOMORROW THEN ROTATES IT INTO A MORE N-S ORIENTATION FRIDAY BUT STILL KEEPS IT WEST OF SLC. THE GFS BREAKS THIS AXIS DOWN TONIGHT THEN REFORMS IT WEAKLY TOMORROW AFTERNOON THEN BREAKS IT DOWN AGAIN FRIDAY. SUSPECT SOME OF THE SOUTHERLY SURGE IT DEVELOPS TONIGHT AND TOMORROW IS A RESULT OF CONVECTIVE FEEDBACK EXCESSIVELY COOLING THE LOWER LEVELS OVER SWRN UT AND CREATING TOO STRONG OF A SURFACE HIGH. ETA HINTS AT THIS BUT KEEPS THE THERMAL TROF FARTHER SOUTH ACROSS THE STATE SO THE LOW LEVEL SURGE NEVER MAKES IT INTO THE NORTH. THERE IS SIGNIFICANT MOISTURE IN PLACE OVER EXTREME SOUTHERN UT AT THIS TIME AND I DO EXPECT CONVECTION TO BE ACTIVE IN THE SOUTHWEST THIS AFTERNOON BUT GFS IS PROBABLY OVERDONE SO SOME BLEND OF THESE TWO SOLUTIONS IS PROBABLY THE WAY TO GO. CURRENT FORECAST ROUGHLY FOLLOWS THESE IDEAS BUT MAY NEED TO EXTEND CONVECTIVE COVERAGE A LITTLE FURTHER NORTH IN THE MTNS THAN IS NOW INDICATED AND WILL INCREASE POPS INTO CHANCE CATEGORY FOR SWRN VALLEYS THAT ARENT ALREADY IN IT. WILL DO A MINOR UPDATE FOR THIS. SLC 00- CDC 323 WILENSKY .SLC...NONE.
IDZ024-025-UTZ001>021-WYZ021-311300- HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SALT LAKE CITY UT 700 AM MDT WED JUL 30 2003 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE WESTERN TWO-THIRDS OF UTAH...EXTREME SOUTHEAST IDAHO AND EXTREME SOUTHWEST WYOMING .DAY ONE... TODAY SHOWERS AND THUNDERSTORMS WILL DEVELOP AGAIN OVER THE SOUTHERN THIRD OF UTAH THIS AFTERNOON AND EVENING. SOME OF THE STRONGER THUNDERSTORMS COULD PRODUCE LOCALLY HEAVY RAINFALL OVER AND NEAR THE MOUNTAINS AND NEAR THE ARIZONA BORDER. .DAYS TWO THROUGH SEVEN... THURSDAY THROUGH TUESDAY 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. WCJIN-WYSW
The national radar mosaic for the moment the first event began.
1 flash flood. Local standard time, as filed.
Flash flooding was reported over the mountains about 2 miles east of Cedar City.
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, July 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: 5379834.