Thunderstorms produced flash flooding in Washington County in far southwest Utah.
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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 episode as NWS SLC wrote it up.
Thunderstorms produced flash flooding in Washington County in far southwest Utah.
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 4, 2:45 PM MST, 1 hour 55 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SALT LAKE CITY UT 345 PM MDT MON AUG 4 2008 .SYNOPSIS...MOISTURE WILL STREAM NORTHWARD TONIGHT AND TUESDAY. DEEP SUBTROPICAL MOISTURE WILL BE IN PLACE FROM WEDNESDAY THROUGH THE END OF THE WORKWEEK. && .DISCUSSION... SCATTERED SHOWERS AND THUNDERSTORMS HAVE DEVELOPED OVER SOUTHWEST UTAH THIS AFTERNOON IN A VERY MOIST AIRMASS. SATELLITE DERIVED IMAGERY INDICATING PRECIPITABLE WATER VALUES NEAR AN INCH AND A QUARTER OVER SOUTHERN UTAH. MID LEVEL DISTURBANCE LIFTING NORTH OUT OF ARIZONA IS SERVING TO FOCUS CONVECTION. MUCH DRIER AND RATHER STABLE AIRMASS REMAINS IN PLACE OVER NORTHERN UTAH. MOISTURE WILL CONTINUE TO SPREAD NORTHWARD TONIGHT AND TUESDAY AS UPPER LEVEL RIDGE OF HIGH PRESSURE SHIFTS EASTWARD. GIVEN DEEP MOISTURE AND FORCING...EXPECT SCATTERED CONVECTION TO CONTINUE WELL INTO THIS EVENING OVER SOUTHERN UTAH...WITH SOME HOLDOVER ACTIVITY EVEN CONTINUING PAST MIDNIGHT. STORMS HAVE BEEN EFFICIENT RAINFALL PRODUCERS THIS AFTERNOON...SO WILL INCLUDE A MENTION OF HEAVY RAINFALL SOUTHWEST. GIVEN NORTHWARD PUSH OF MOISTURE...EXPECT SCATTERED THUNDERSTORM ACTIVITY ACROSS CENTRAL AND SOUTHERN UTAH ON TUESDAY...WITH HEAVY RAINFALL AGAIN POSSIBLE. GIVEN UNCERTAINLY WITH RESPECT TO LOCATION OF A TRIGGERING MECHANISM...WILL NOT ISSUE A FLASH FLOOD WATCH FOR NOW. ACROSS NORTHERN SECTIONS...CONVECTION SHOULD BE MORE ISOLATED IN NATURE. WEDNESDAY SHOULD BE THE MOST ACTIVE CONVECTIVE DAY AS DEEP MOISTURE WILL BE IN PLACE ACROSS THE ENTIRE FORECAST AREA AND MODELS IN GENERAL AGREEMENT WITH LIFTING A MID LEVEL DISTURBANCE ACROSS REGION. MODELS NOW IN GENERAL AGREEMENT WITH BUILDING UPPER RIDGE BACK OVER FORECAST AREA ON THURSDAY AND FRIDAY. WHILE WARMER TEMPERATURES ALOFT AND LITTLE OR NO SYNOPTIC FORCING WILL REDUCE CONVECTIVE ACTIVITY SOMEWHAT...DEEP MOISTURE WILL REMAIN IN PLACE SO WILL STILL SEE ISOLATED TO SCATTERED CONVECTION. ECMWF AND GFS BOTH SUGGEST A SERIES OF WEAK MID LEVEL DISTURBANCES WILL BREAK DOWN RIDGE LATE IN THE WEEKEND WITH A MORE ROBUST SOUTHWEST TO WEST FLOW SWEEPING MOISTURE OUT OF THE REGION. THIS SHOULD RESULT IN A SHIFT TO TYPICAL SUMMER DIURNAL ACTIVITY...FOCUSED ACROSS THE HIGH TERRAIN. && .HYDROLOGY...THREAT EXISTS FOR ISOLATED FLASH FLOODING THIS EVENING ACROSS SOUTHERN UTAH GIVEN MOIST AIRMASS AND WEAK FLOW. POTENTIAL FOR FLASH FLOODING WILL INCREASE ON TUESDAY...BUT WEDNESDAY LOOKS TO BE MOST ACTIVE. && .AVIATION...NORTHWESTERLY LAKE BREEZE WILL GIVE WAY TO SOUTHEAST DRAINAGE WINDS BY 04Z. VFR CONDITIONS WILL PREVAIL THROUGH TONIGHT...WITH THUNDERSTORM ACTIVITY REMAINING WELL SOUTH OF THE SLC AREA. && .FIRE WEATHER...UPPER LEVEL RIDGE WILL REMAIN IN PLACE OVER THE GREAT BASIN THROUGH THE REMAINDER OF THE WEEK. WITH THE CENTER OF THE HIGH PRESSURE ALOFT REFORMING OVER THE SOUTHERN PLAINS SOUTHERLY FLOW WILL DEVELOP ALLOWING DEEP MOISTURE TO SPREAD NORTH THROUGH UTAH. AS THIS DEEP MOISTURE SPREADS NORTH...AT LEAST SCATTERED COVERAGE OF THUNDERSTORMS CAN BE EXPECTED IN CENTRAL AND SOUTHERN UTAH ON TUESDAY AND STATEWIDE ON WEDNESDAY AND THURSDAY. LOCALLY HEAVY RAIN WILL BE POSSIBLE AS THE DEEP MOISTURE LIFTS NORTH. ONCE THIS MOISTURE SPREADS THROUGH THE STATE IT IS EXPECTED TO REMAIN IN PLACE THROUGH THE REMAINDER OF THE WEEK. WITH THE DEEP MOISTURE SPREADING NORTH RELATIVE HUMIDITIES WILL ALSO IMPROVE. AFTERNOON MINIMUM RELATIVE HUMIDITY VALUES ARE EXPECTED TO REMAIN ABOVE CRITICAL LEVELS ACROSS MUCH OF THE STATE ON TUESDAY...WITH THE POSSIBLE EXCEPTION BEING THE FAR NORTHWEST PORTION OF UTAH. MINIMUM RELATIVE HUMIDITIES SHOULD IMPROVE FURTHER ON WEDNESDAY STATEWIDE. OVERNIGHT RECOVERIES WILL ALSO BE QUITE GOOD. WITH THE HIGH PRESSURE BRINGING LIGHT WINDS ALOFT...SURFACE WINDS WILL PRIMARILY BE TERRAIN DRIVEN AWAY FROM THUNDERSTORMS THROUGH MUCH OF THE WEEK. && .SLC WATCHES/WARNINGS/ADVISORIES... UT...NONE. WY...NONE. && AVIATION/PUBLIC...BARJENBRUCH FIRE...GRAHAM FOR MORE INFORMATION FROM NOAA/S NATIONAL WEATHER SERVICE VISIT...HTTP://WEATHER.GOV/SALTLAKECITY (ALL LOWER CASE)
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SALT LAKE CITY UT 425 AM MDT MON AUG 4 2008 UTZ001>016-019>021-517-518-WYZ021-051200- CACHE VALLEY/UTAH PORTION-NORTHERN WASATCH FRONT- SALT LAKE AND TOOELE VALLEYS-SOUTHERN WASATCH FRONT- GREAT SALT LAKE DESERT AND MOUNTAINS-WASATCH MOUNTAIN VALLEYS- WASATCH MOUNTAINS I-80 NORTH-WASATCH MOUNTAINS SOUTH OF I-80- WESTERN UINTA MOUNTAINS-WASATCH PLATEAU/BOOK CLIFFS- WESTERN UINTA BASIN-CASTLE COUNTRY-SAN RAFAEL SWELL- SANPETE/SEVIER VALLEYS-WEST CENTRAL UTAH-SOUTHWEST UTAH- UTAHS DIXIE AND ZION NATIONAL PARK-SOUTH CENTRAL UTAH- GLEN CANYON RECREATION AREA/LAKE POWELL-CENTRAL MOUNTAINS- SOUTHERN MOUNTAINS-SOUTHWEST WYOMING- 425 AM MDT MON AUG 4 2008 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE WESTERN TWO THIRDS OF UTAH AND SOUTHWEST WYOMING. .DAY ONE...TODAY AND TONIGHT MOISTURE WILL INCREASE OVER FAR SOUTHERN UTAH AND PRODUCE ISOLATED THUNDERSTORMS WITH HEAVY RAIN. ACROSS THE NORTH IT WILL BE MOSTLY SUNNY WITH ONLY ISOLATED THUNDERSTORMS IN THE CENTRAL AREAS WHERE LOCAL GUSTY WINDS WILL OCCUR. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY DEEP SUBTROPICAL MOISTURE WILL SPREAD INTO NORTHERN UTAH STARTING TUESDAY AND INCREASE ACROSS THE ENTIRE REGION THROUGH WEDNESDAY AS A WEATHER DISTURBANCE PUSHES ACROSS UTAH. THIS WILL RESULT IN AN ACTIVE THUNDERSTORM PATTERN WITH LOCALLY HEAVY RAIN AND AN INCREASED THREAT OF FLASH FLOODING SPREADING FROM SOUTH TO NORTH. DEEP MOISTURE IS EXPECTED TO REMAIN IN PLACE THURSDAY THROUGH SATURDAY. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES. TARDY FOR MORE INFORMATION FROM NOAA/S NATIONAL WEATHER SERVICE VISIT... HTTP://WEATHER.GOV/SALTLAKECITY (ALL LOWER CASE)
The Cedar City radar (KICX), 40 km away, was scanning. The volume nearest the first event began at 23:41 UTC.
2 flash flood. Local standard time, as filed.
Heavy rain caused a large flash flood on North Creek flowing out of Zion National Park. Flows increased on the Virgin River, north of the town of Virgin, from 54 cfs to 2562 cfs.
Heavy rain from a thunderstorm caused flash flooding in Snow Creek Canyon. This drainage eventually flows into the Santa Clara River.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Utah in 2008Every state in 2008This day in weather historyWarnings in Utah, August 2008
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: 133064, 133070.