Thunderstorms on August 14 and 15 were heaviest east of the spine of Utah, with Capitol Reef National Park and Grand Staircase-Escalante National Monument both reporting flash floods during this period.
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.
Thunderstorms on August 14 and 15 were heaviest east of the spine of Utah, with Capitol Reef National Park and Grand Staircase-Escalante National Monument both reporting flash floods during this period.
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 14, 9:39 AM MST, 4 hours 6 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SALT LAKE CITY UT 1039 AM MDT THU AUG 14 2014 .SYNOPSIS...THE AIRMASS ACROSS THE REGION WILL DRY FROM THE WEST BEGINNING TODAY. HIGH PRESSURE WILL BUILD LATE IN THE WEEKEND THROUGH EARLY NEXT WEEK. && .DISCUSSION...PRECIPITATION HAS DIED OFF ACROSS THE FORECAST AREA THIS MORNING. DRIER AIR IS MOVING INTO THE FORECAST AREA FROM THE WEST. THE GOES PW SOUNDER SHOWS PW VALUES OF AROUND 0.6 TO 0.8...WITH DRIER AIR ACROSS CENTRAL AND EASTERN NEVADA. HOWEVER...THE INTERESTING THING IS THAT ALTHOUGH PWS ARE LOWER THAN YESTERDAY...SURFACE DEWPOINTS PRETTY MUCH STATEWIDE ARE THE SAME OR HIGHER THAN THOSE OBSERVED YESTERDAY MORNING. WITH MOSTLY CLEAR SKIES ACROSS CENTRAL AND SOUTHERN UTAH...EXPECT THAT CONVECTION WILL DEVELOP OVER THE HIGHER TERRAIN EARLY THIS AFTERNOON WITH DAYTIME HEATING. THE HRRR SUPPORTS THIS IDEA...SHOWING CONVECTION DEVELOPING ACROSS CENTRAL AND SOUTHERN UTAH THIS AFTERNOON. IT LOOKS LIKE THE 18Z- 22Z WILL BE THE TIME PERIOD WITH THE MOST WIDESPREAD CONVECTION AS DRIER AIR MIXING TO THE SURFACE LATE AFTERNOON/EARLY EVENING WILL PUT A DAMPER ON THE ACTIVITY. THE SPC SREF SUPPORTS THIS IDEA...AND SHOWS MIXED LAYER CAPE AND LI'S DECREASING FROM THE WEST LATER THIS AFTERNOON. SO...UPDATED THE POP GRIDS FOR THIS AFTERNOON TO INCREASE THE CHANCE OF PRECIP ACROSS CENTRAL AND SOUTHERN UTAH. DRY AIR WILL CONTINUE TO MOVE INTO THE FORECAST AREA INTO THIS EVENING. THIS DRIER AIR...COMBINED WITH RISING HEIGHTS WILL RESULT IN QUIET WEATHER ACROSS THE FORECAST AREA. TEMPERATURES WILL SLOWLY RISE INTO EARLY NEXT WEEK. PREVIOUS LONG TERM DISCUSSION FOLLOWS. && .LONG TERM (AFTER 12Z SUNDAY)...ECMWF AND GFS IN GOOD AGREEMENT WITH RESPECT TO THE LARGE SCALE PATTERN DURING THE MEDIUM RANGE. FOR THE EARLY TO MIDDLE PORTION OF NEXT WEEK...THE GREAT BASIN WILL BE UNDERNEATH THE INFLUENCE OF AN UPPER LEVEL RIDGE AS A CUTOFF LOW RETROGRADES OFF THE COAST OF CALIFORNIA. THE ECMWF DEPICTS A LITTLE STRONGER RIDGE THAN DOES THE GFS AND ACCORDINGLY HAS 7H TEMPERATURES ABOUT 1-2C WARMER THROUGH THE PERIOD. NAEFS SPAGHETTI PLOTS SUPPORT THIS POSSIBILITY...ALTHOUGH MOST MEMBERS LEAN MORE TOWARD THE AMPLITUDE IN THE OPERATIONAL GFS. FOR THE SUN-WED PERIOD...HEAVILY UTILIZED BIAS CORRECTED ENSEMBLE TEMPERATURE GUIDANCE WHICH FELL BETWEEN THE ECMWF AND GFS TEMPERATURES. EITHER WAY TEMPERATURES LOOK TO BE NEAR NORMAL DURING THIS PERIOD. UPPER LEVEL HIGH CENTERED OVER ARIZONA THROUGH MOST OF THE MEDIUM RANGE PERIOD WILL PREVENT DEEP SOUTHERLY FLOW FROM DEVELOPING. AS A RESULT MONSOON MOISTURE SHOULD REMAIN CONFINED WELL TO THE SOUTH OF UTAH. WITH UPPER LEVEL FLOW LARGELY FROM THE WEST OVER THE GREAT BASIN THROUGH THIS PERIOD IT APPEARS THAT IT WILL BE QUITE A DRY STRETCH. && .AVIATION...VFR CONDITIONS ARE EXPECTED AT THE SLC TERMINAL THROUGH THE TAF PERIOD. WINDS SHOULD PREVAIL OUT OF THE SOUTH THROUGH THE DAY WITH A SLIGHT INCREASE IN SPEEDS DURING THE MIDDAY HOURS. HOWEVER...THERE IS A 40 PERCENT CHANCE THAT WINDS WILL SHIFT TO NORTHWEST AFTER 20-21Z. && .SLC WATCHES/WARNINGS/ADVISORIES... UT...NONE. WY...NONE. && PUBLIC...HOSENFELD AVIATION...STRUTHWOLF FOR MORE INFORMATION FROM NOAA/S NATIONAL WEATHER SERVICE VISIT... HTTP://WEATHER.GOV/SALTLAKECITY (ALL LOWER CASE) FOR FREQUENTLY ASKED QUESTIONS ABOUT THE AREA FORECAST DISCUSSION VISIT... HTTP://WEATHER.GOV/SALTLAKECITY/GENERAL/AFD_FAQS.PHP (ALL LOWER CASE)
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SALT LAKE CITY UT 312 AM MDT THU AUG 14 2014 UTZ001>016-019>021-517-518-WYZ021-151300- 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- 312 AM MDT THU AUG 14 2014 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE WESTERN TWO THIRDS OF UTAH AND SOUTHWEST WYOMING. .DAY ONE...TODAY AND TONIGHT SCATTERED SHOWERS AND THUNDERSTORMS WILL BE POSSIBLE ACROSS MAINLY EASTERN UTAH TODAY. SOME OF THIS ACTIVITY WILL BE CAPABLE OF PRODUCING LOCALLY HEAVY RAINFALL. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES. ROGOWSKI FOR MORE INFORMATION FROM NOAA/S NATIONAL WEATHER SERVICE VISIT... HTTP://WEATHER.GOV/SALTLAKECITY/ (ALL LOWER CASE) FOR INFORMATION ON POTENTIAL ROAD TRAVEL IMPACTS VISIT... HTTP://WWW.UDOTTRAFFIC.UTAH.GOV/ROADWEATHERFORECAST.ASPX
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SALT LAKE CITY UT 219 PM MDT THU AUG 14 2014 UTZ010-011-142045- WESTERN UINTA BASIN UT-WASATCH PLATEAU/BOOK CLIFFS UT- 219 PM MDT THU AUG 14 2014 ...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL DUCHESNE COUNTY UNTIL 245 PM MDT... AT 218 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM 7 MILES WEST OF DUCHESNE...MOVING NORTHEAST AT 25 MPH. NICKEL SIZE HAIL AND WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE. LOCATIONS IMPACTED INCLUDE... DUCHESNE...UPALCO...ARCADIA...MOUNTAIN HOME...UTAHN...AND STARVATION RESERVOIR. PRECAUTIONARY/PREPAREDNESS ACTIONS... IF THREATENING WEATHER APPROACHES...TAKE SHELTER IN A STURDY BUILDING. TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED ROADWAYS. && LAT...LON 3998 11048 4019 11072 4045 11041 4019 11011 TIME...MOT...LOC 2018Z 232DEG 20KT 4015 11053 MT
The Cedar City radar (KICX), 166 km away, was scanning. The volume nearest the first event began at 20:45 UTC.
3 flash flood. Local standard time, as filed.
Heavy rain caused flash flooding in Capitol Reef National Park, including along Pleasant Creek, Sheets Gulch, and Cottonwood Wash. In addition, the Notom Road was impacted by the flooding.
Flash flooding was reported in the Grand Staircase-Escalante National Monument, including along the Burr Trail, with mud, rocks, and water flowing across the roadway.
Park rangers reported flash flooding along Sheets Gulch in Capitol Reef National Park.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Utah in 2014Every state in 2014This day in weather historyWarnings in Utah, August 2014
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: 541396, 541398, 541397.