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 21, 3:00 PM MST, 1 hour 44 minutes earlier.
UTAH AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SALT LAKE CITY UT 400 PM MDT MON JUL 21 2003 .SYNOPSIS...HIGH PRESSURE ALOFT WILL REMAIN OVER EASTERN NEVADA THROUGH WEDNESDAY WITH A GRADUAL DECREASE IN MOISTURE OVER THE FORECAST AREA. .DISCUSSION...HIGH POSITIONED TO OUR WEST WHICH HAS PULLED SOME SLIGHTLY DRIER AIR INTO THE NORTH. HIGH WILL REMAIN BASICALLY STATIONARY NEXT COUPLE OF DAYS TO KEEP AREA IN A FAIRLY SIMILAR WEATHER PATTERN....HOT WITH AFTERNOON AND EVENING THUNDERSTORMS FROM THE UINTAS SOUTHWEST ALONG THE HIGH TERRAIN. CU DEVELOPMENT OVER THE NORTH THIS AFTERNOON HAS BEEN UNEVENTFUL AT BEST. CONVECTION OVER THE UINTAS FINALLY GOT GOING AFTER SOME FLAT CU...BUT NOT AS STRONG AS THE LAST COUPLE OF DAYS. ACTIVITY OVER THE CENTRAL AND SOUTHWEST MOUNTAINS HAS BEEN STRONGER IN THE DEEPER MOISTURE AND BETTER INSTABILITY. STORMS DRIFTING SOUTH OFF THE PLATEAU AND INTO SOUTHERN VALLEYS. DECIDED TO INCREASE POPS SLIGHTLY IN THE SOUTH FOR THIS EVENING BASED ON CURRENT KICX RADAR SHOWING CELLS DRIFTING TO THE SOUTH. WASATCH PLATEAU HAS BEEN DOING WELL THIS AFTERNOON AS WELL. NOT MUCH CHANGE TOMORROW AS HIGH REMAINS CENTERED JUST TO OUR WEST ON THE NV/UT BORDER. ETA AND GFS EACH SHOWING AN EASTERLY WAVE MOVING THROUGH ARIZONA AND INCREASING THE EASTERLY FLOW IN THE SOUTH. THIS WILL PUSH MOUNTAIN AFTERNOON CONVECTION TO THE WEST RATHER THAN SOUTH LIKE TODAY. NORTH REMAINS STEADY FOR MOISTURE AND STABILITY COMPARED TO TODAY...STILL NOT QUITE ENOUGH FOR ANYTHING BUT ISOLATED IN THE MOUNTAINS. HIGH MOISTENS UP SLIGHTLY ON WEDNESDAY BUT MODELS STILL CONFINE MOST OF THE MOISTURE IN THE CENTRAL AND SOUTH...WHICH SEEMS REASONABLE. POSITIVE LI AREA STILL OVER NORTHERN AREAS...SO ANOTHER DAY LIKE TUES. GFS PROGRESSES UPPER AIR PATTERN EAST STARTING LATE WEDNESDAY INTO THURSDAY...MOVING THE UPPER RIDGE TO OUR EAST AND INCREASING THE SOUTHWESTERLY FLOW. AS A RESULT SMALL RIPPLES MOVE THROUGH THE FASTER FLOW TO OUR NORTHWEST AND BRUSH THE NORTH LATE THURSDAY AND FRIDAY. BEST CHANCE FOR MEASURABLE THIS FORECAST PACKAGE IN SLC/TOOELE AREA WILL PROBABLY BE DURING THIS TIME. A WEAK BOUNDARY IS CURRENTLY PROGGED TO DROP IN OVER THE NORTH DURING THE SAME TIME WHICH COULD ACT AS A TRIGGER FOR ACTIVITY IN THE NORTH FRIDAY. HIGH MOVES BACK TO THE WEST FOR THE WEEKEND INTO NEXT MONDAY PUTTING US IN A BASIC HIGH-TERRAIN...AFTERNOON CONVECTION PATTERN WITHOUT ANY PREDICTABLE FORCING TO FOCUS ANY ONE DAY OVER THE OTHER. EUROPEAN MODELS ARE IN FAIR AGREEMENT WITH GFS WITH THIS RIDGE SHIFT BACK TO THE WEST. TEMPERATURES WILL REMAIN HOT THROUGH THE PERIOD WITH 700 MB TEMPS IN THE 16-19 DEG RANGE. AT THIS POINT IT LOOKS LIKE THE SLC RECORD OF 9 STRAIGHT 100+ DAYS WILL BE BROKEN WITH 100+ HIGHS LIKELY TUES AND WED...AND POSSIBLY THURSDAY. TODAYS HIGH IS THE 7TH STRAIGHT. SLC ---0 CDC 2332 JACKSON .SLC...NONE.
IDZ024-025-UTZ001>021-WYZ021-221300- HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SALT LAKE CITY UT 700 AM MDT MON JUL 21 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... TUESDAY THROUGH SUNDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. WCJIN-WYSW
The Cedar City radar (KICX), 66 km away, was scanning. The volume nearest the first event began at 23:43 UTC.
1 flash flood. Local standard time, as filed.
A small scale flash flood was reported by a park employee at Zion National Park.
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: 5379829.