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, 2:30 PM MST, 42 minutes earlier.
UTAH AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SALT LAKE CITY UT 330 PM MDT WED JUL 30 2003 .SYNOPSIS...HIGH PRESSURE ALOFT OVER NORTHERN UTAH AND NORTHERN NEVADA WILL MOVE SLOWLY EAST TONIGHT THROUGH FRIDAY...ALLOWING MOISTURE TO GRADUALLY MOVE UP FROM THE SOUTH. A MOIST SOUTHWESTERLY FLOW WILL DEVELOP OVER THE ENTIRE AREA SATURDAY. .DISCUSSION...THUNDERSTORMS GROWING RAPIDLY OVER SOUTHWESTERN UTAH THIS AFTERNOON IN MOIST EASTERLY FLOW. ISOLATED STORMS HAVE ALSO DEVELOPED AS FAR NORTH AS THE WASATCH PLATEAU NORTH OF PRICE. STORMS OVER THE SOUTH SHOULD PERSIST WELL INTO THE EVENING THEN DIMINISH...ALTHOUGH ISOLATED STORMS WILL GO THROUGH THE NIGHT... ESPECIALLY OVER THE SOUTHEAST. NOT A LOT OF CHANGE IN THE AIRMASS EXPECTED OVER THE SOUTH THURSDAY AND FRIDAY AS THE RIDGE AXIS OVER THE NORTH GRADUALLY ROTATES ANTI-CYCLONICALLY...AND CONVECTION SHOULD CONTINUE WITH LOCALLY HEAVY RAIN POSSIBLE. THE SHIFTING RIDGE WILL ALLOW THE MOISTURE TO WORK SLOWLY NORTHWARD NEXT TWO DAYS. THE FLOW BECOMES MORE UNIFORMLY SOUTH TO SOUTHWEST OVER THE AREA FRIDAY NIGHT AND SATURDAY AND THIS SHOULD FINALLY ALLOW THE DEEP MOISTURE TO SURGE NORTH. SO EXPECT SAT TO BE QUITE ACTIVE AREA-WIDE. AS THE REMAINS OF THE LOW OFF THE SRN CA COAST LIFT NWD INTO ORE ON SAT NIGHT AND SUN...THE FLOW VEERS TO A LITTLE MORE SOUTHWESTERLY OVER OUR AREA AND STARTS TO DRY FROM THE SOUTHWEST. THE GFS IS PROBABLY TOO FAST DRYING THE NORTH SUN AND MON BUT WILL TREND FORECASTS TOWARDS A DRIER REGIME BY MID-WEEK. SLC 0113 CDC 4443 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 in the Narrows headwater drainage. Gauges detected a rise of 160 cubic feet per second at Springdale.
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: 5379836.