Slow moving thunderstorms caused flash flooding in the Salt Lake Valley and portions of southern Utah.
Every event with a place to put it. 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 episode as NWS SLC wrote it up.
Slow moving thunderstorms caused flash flooding in the Salt Lake Valley and portions of southern 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 3, 9:25 AM MST, 3 hours 12 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SALT LAKE CITY UT 1025 AM MDT FRI AUG 3 2007 .SYNOPSIS...DEEP MOISTURE ACROSS THE REGION WILL BEGIN TO DRY OUT FROM THE WEST TODAY AS AN UPPER LEVEL TROUGH CROSSES NORTHERN UTAH. DRIER SOUTHWEST FLOW WILL PERSIST OVER THE WEEKEND WITH WEAK DISTURBANCES PASSING ACROSS NORTHWEST UTAH EACH DAY. ENOUGH MOISTURE WILL REMAIN FOR SCATTERED THUNDERSTORMS. && .DISCUSSION...DEEP MOISTURE REMAINS IN PLACE ACROSS THE STATE THIS MORNING WITH PRECIPITABLE WATER VALUES GENERALLY IN THE 1 TO 1.5 INCH RANGE. HOWEVER...AS TROUGH AXIS MOVES THROUGH NORTHERN UTAH THIS MORNING SHOULD SEE SOME DECREASE IN THE PRECIPITABLE WATER VALUES ACROSS THE NORTHWEST PORTION OF THE STATE THROUGH THE AFTERNOON. WINDS APPEAR TO BE SHIFTING IN THE KMTX VWP THIS MORNING SHOWING THE WAVE MOVING THROUGH THE AREA. AS THE WEAK TROUGH AXIS SHIFTS TO THE EAST TODAY CONVECTION WILL DEVELOP ONCE AGAIN. ANTICIPATE THE CONVECTION COVERAGE WILL BE GREATEST ACROSS CENTRAL AND EASTERN UTAH THIS AFTERNOON AND EVENING. CONVECTION WILL BE MORE ISOLATED IN NATURE ACROSS THE VALLEYS OF WEST CENTRAL AND NORTHWEST UTAH IN THE SUBSIDENT REGION BEHIND THE WEAK WAVE MOVING THROUGH THE STATE. IN ADDITION...THERE APPEARS A STRONG SURGE OF MOISTURE LIFTING NORTH THROUGH AZ THIS MORNING. THIS WILL IMPACT THE SOUTHEAST PORTION OF THE STATE THIS AFTERNOON. THERE IS ONCE AGAIN THE THREAT FOR HEAVY RAIN AND FLASH FLOODING THIS AFTERNOON WITH LIGHT FLOW AND DEEP MOISTURE IN PLACE AND A WEAK WAVE MOVING THROUGH THE STATE. MINOR UPDATE TO ZONES THIS MORNING TO FRESHEN UP WORDING. && .FIRE...NO SIGNIFICANT FIRE WEATHER CONCERNS ARE EXPECTED THROUGH SATURDAY. THE AIRMASS OVER THE DISTRICT WILL SEE SOME DRYING LATER TODAY...WHICH WILL ACT TO DECREASE AFTERNOON CONVECTION SOME OVER THE NEXT FEW DAYS. THE FLOW ALOFT SHOULD PICK UP SUNDAY AHEAD OF A PACIFIC TROUGH...AND THIS MAY PRODUCE ISOLATED RED FLAG CONDITIONS OVER WESTERN UTAH WHERE RELATIVE HUMIDITY VALUES ARE EXPECTED TO BE MARGINALLY SEVERE. && .AVIATION...TYPICAL WIND SHIFT TO LAKE BREEZE EXPECTED AT SLC TERMINAL TODAY. THERE IS A 10 PERCENT CHANCE THAT OUTFLOW FROM ISOLATED CONVECTION IN THE AREA WILL IMPACT THE SLC TERMINAL THIS AFTERNOON OR EVENING RESULTING IN GUSTY ERRATIC WINDS. && .SLC WATCHES/WARNINGS/ADVISORIES... UT...NONE. WY...NONE. && PUBLIC AND AVIATION....GRAHAM FIRE WEATHER...TRAPHAGAN 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 438 AM MDT FRI AUG 3 2007 UTZ001>009-014-015-WYZ021-041200- 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-SANPETE/SEVIER VALLEYS-WEST CENTRAL UTAH- SOUTHWEST WYOMING- 438 AM MDT FRI AUG 3 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR MOST OF CENTRAL AND NORTHERN UTAH AND SOUTHWEST WYOMING. .DAY ONE...TODAY AND TONIGHT SCATTERED THUNDERSTORMS WILL OCCUR THIS MORNING AND INCREASE IN COVERAGE BY LATE MORNING. ACTIVITY IN THE VALLEYS WILL DECREASE FROM WEST TO EAST IN THE AFTERNOON BUT BECOME NUMEROUS IN THE NORTHEAST UTAH AND SOUTHWEST WYOMING. THUNDERSTORMS WILL PRODUCE LOCALLY HEAVY RAIN TODAY. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY WIDELY SCATTERED THUNDERSTORMS FOR SATURDAY AND SUNDAY...MAINLY IN NORTHWEST UTAH AND THE NORTHEAST MOUNTAINS. ISOLATED THUNDERSTORMS MONDAY THROUGH THURSDAY. SOUTHWEST WINDS WILL INCREASE ACROSS WEST CENTRAL UTAH ON SUNDAY. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES. UTZ010>013-016-019>021-517-518-041200- WASATCH PLATEAU/BOOK CLIFFS-WESTERN UINTA BASIN-CASTLE COUNTRY- SAN RAFAEL SWELL-SOUTHWEST UTAH- UTAHS DIXIE AND ZION NATIONAL PARK-SOUTH CENTRAL UTAH- GLEN CANYON RECREATION AREA/LAKE POWELL-CENTRAL MOUNTAINS- SOUTHERN MOUNTAINS- 438 AM MDT FRI AUG 3 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL AND EASTERN UTAH...AND MOST OF SOUTHERN UTAH. .DAY ONE...TODAY AND TONIGHT SCATTERED THUNDERSTORMS WILL DEVELOP THIS MORNING AND BECOME NUMEROUS FROM LATE MORNING THROUGH THE AFTERNOON. THUNDERSTORMS WILL BE CAPABLE OF PRODUCING VERY HEAVY RAIN AND POSSIBLE HAIL INTO THE EARLY EVENING HOURS. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY THUNDERSTORMS MAINLY ACROSS SOUTH CENTRAL AND EASTERN UTAH FOR SATURDAY AND SUNDAY. THUNDERSTORMS MAY CONTAIN HEAVY RAIN... ESPECIALLY IN THE AFTERNOON AND EVENING HOURS. SCATTERED THUNDERSTORMS FOR MOST AREAS MONDAY THROUGH THURSDAY. SOUTHWEST WINDS WILL INCREASE ACROSS SOUTHWEST UTAH ON SUNDAY. .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 Salt Lake City radar (KMTX), 100 km away, was scanning. The volume nearest the first event began at 19:38 UTC.
4 flash flood. Local standard time, as filed.
Rainfall of 1.1 inches in 30 minutes inundated storm drains and resulted in numerous reports of basement flooding.
Heavy rains sent a mudslide across US-89, forcing a road closure near Willow Creek Canyon. Other smaller slides were reported in the area.
Flash flooding of drainages within water pocket fold occurred in areas of Capitol Reef NP. The time was estimated from river gauges.
Caineville Wash Road and other roads leading into the Cathedral district were impassable due to mud covering roadways from flash floods. Additionally 2 vehicles were stranded near Sandy Creek. The time of occurrence was estimated.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Utah in 2007Every state in 2007This day in weather historyWarnings in Utah, August 2007
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: 55527, 55528, 55525, 55526.