An isolated, windy thunderstorm in southeast Utah caused some damage on Lake Powell. In addition, a thunderstorm producing heavy rain caused a flash flood at Capitol Reef National Park.
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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.
An isolated, windy thunderstorm in southeast Utah caused some damage on Lake Powell. In addition, a thunderstorm producing heavy rain caused a flash flood at Capitol Reef National Park.
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 May 23, 11:50 AM MST, 1 hour 22 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SALT LAKE CITY UT 1250 PM MDT FRI MAY 23 2014 .SYNOPSIS...THE UPPER LOW OVER ARIZONA WILL SPREAD A MOIST AND SOMEWHAT UNSTABLE AIR MASS ACROSS MUCH OF UTAH TODAY. THIS UPPER LOW WILL IMPACT MUCH OF THE STATE THROUGH EARLY SUNDAY. HIGH PRESSURE ALOFT WILL RETURN LATER ON SUNDAY AND PERSIST THROUGH EARLY NEXT WEEK. && .DISCUSSION...CENTER OF THE UPPER LOW HAS MOVED INTO SOUTHWEST ARIZONA THIS MORNING...BRINGING MOISTURE AND INSTABILITY INTO PRIMARILY CENTRAL AND SOUTHERN UTAH. SATELLITE DERIVED PWS LOOK TO BE IN THE 0.6 TO 0.75 INCH RANGE OVER EASTERN UTAH AND ARE SPREADING TO THE WEST. VORT LOBES OVER CENTRAL AND SOUTHERN UTAH ARE PRODUCING AREAS OF SHOWERS...AND DAYTIME HEATING WILL JUST ADD TO THE INSTABILITY. GFS INDICATES POCKETS OF LIFTED INDICES AS LOW AS -2...PRIMARILY OVER THE EASTERN HALF OF THE STATE. WITH THIS IN MIND...HAVE INCREASE POPS FOR MANY CENTRAL AND SOUTHERN UTAH LOCATIONS TODAY GIVEN THE CURRENT ACTIVITY AND EXPECTED TRENDS. LIGHT FLOW COULD RESULT IN SLOW STORM MOVEMENT SO ISOLATED FLASH FLOODING IS A POSSIBILITY LATER TODAY. THE LOW CONTINUES ITS SLOW MOVEMENT ACROSS ARIZONA THROUGH EARLY SUNDAY. MOISTURE SPREADS ACROSS THE ENTIRE STATE BY SATURDAY...AND INSTABILITY SHOULD STILL BE HIGH SO IT WILL LIKELY BE ANOTHER ACTIVE DAY. A FEW SHOWERS MAY HANG AROUND PRIMARILY EASTERN UTAH ON SUNDAY BUT THE EXITING LOW WILL ALLOW FOR HIGH PRESSURE TO MOVE INTO THE GREAT BASIN THROUGH EARLY NEXT WEEK. NO ADDITIONAL UPDATES TO THE FORECAST EXPECTED THIS MORNING. && .AVIATION...THE SLC TERMINAL WILL SEE VFR CONDITIONS THROUGHOUT THE DAY. SOUTHERLY WINDS ARE EXPECTED TO SHIFT TO THE NORTHWEST BETWEEN 19Z AND 21Z. HOWEVER...THERE IS A 40 PERCENT CHANCE THAT THE TERMINAL WILL SEE PERIODS OF GUSTY AND/OR ERRATIC WINDS THIS AFTERNOON AND EARLY EVENING DUE TO SHOWERS IN THE VICINITY. THERE IS A 10 PERCENT CHANCE OF A THUNDERSTORM DIRECTLY IMPACTING THE TERMINAL DURING THAT TIME. && .FIRE WEATHER...RELATIVE HUMIDITY VALUES SHOULD BE HIGHER ACROSS MUCH OF THE FIRE DISTRICT TODAY...AS MOISTURE CONTINUES TO WORK INTO THE AREA FROM THE SOUTH AND EAST. THERE WILL BE A CHANCE OF THUNDERSTORMS AND WETTING RAINS ACROSS MOST OF THE AREA TODAY AND SATURDAY...WITH THE GREATEST COVERAGE OF STORMS EXPECTED NEAR THE SPINE OF UTAH AND EASTWARD. THE AIRMASS WILL BEGIN DRYING ON SUNDAY AS THE LOW PRESSURE SYSTEM EXITS THE REGION...WITH SOME LINGERING SHOWERS POSSIBLE IN EASTERN UTAH. DRY AND WARM SOUTHWESTERLY FLOW WILL DEVELOP ON MONDAY AND CONTINUE THROUGH MUCH OF THE WORK WEEK...THOUGH ISOLATED SHOWERS MAY STILL BE POSSIBLE AT TIMES ACROSS NORTHERN UTAH. WIND SPEEDS CURRENTLY LOOK MARGINAL WITH REGARDS TO WHETHER THEY WILL REACH CRITICAL VALUES IN FAR SOUTHWEST UTAH WHERE FUELS ARE CURED. && .SLC WATCHES/WARNINGS/ADVISORIES... UT...NONE. WY...NONE. && PUBLIC/AVIATION...TRAPHAGAN FIRE WEATHER...SCHOENINGTHE NORTHWEST. THERE IS A 30 PERCENT CHANCE THAT THIS WIND SHIFT WILL OCCUR AS LATE AT 01Z. OTHERWISE...VFR CONDITIONS WILL PREVAIL THROUGH THE TAF PERIOD. && .SLC WATCHES/WARNINGS/ADVISORIES... UT...NONE. WY...NONE. && PUBLIC... AVIATION... 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 539 AM MDT FRI MAY 23 2014 UTZ001>016-019>021-517-518-WYZ021-241200- 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- 539 AM MDT FRI MAY 23 2014 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE WESTERN TWO THIRDS OF UTAH AND SOUTHWEST WYOMING. .DAY ONE...TODAY AND TONIGHT THE LOW PRESSURE SYSTEM MOVING EAST ACROSS ARIZONA TODAY WILL GENERATE SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS ACROSS MUCH OF NORTHEAST...CENTRAL...AND SOUTHERN UTAH THROUGH TONIGHT. ACROSS NORTHERN UTAH AND SOUTHWEST WYOMING ISOLATED SHOWERS AND THUNDERSTORMS WILL DEVELOP THIS AFTERNOON...THEN CONTINUE ACROSS THE AREA THROUGH THE OVERNIGHT HOURS. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY THE ARIZONA LOW PRESSURE SYSTEM WILL ONLY HAVE REACHED NORTHEAST ARIZONA BY SATURDAY. SCATTERED SHOWERS AND THUNDERSTORMS WILL PERSIST ACROSS CENTRAL AND SOUTHERN UTAH THROUGH SATURDAY NIGHT. BRIEF HEAVY RAIN MAY DEVELOP WITH SOME OF THE THUNDERSTORM ACTIVITY. NORTHERN AND WESTERN UTAH WILL SEE SOME SHOWER AND THUNDERSTORM ACTIVITY THROUGH SATURDAY AFTERNOON. SHOWERS AND STORMS WILL SHOW A DECREASING TREND LATE SATURDAY THROUGH SATURDAY NIGHT AS DRIER AND MORE STABLE AIR MOVES INTO THE REGION FROM THE WEST. THE EXITING LOW PRESSURE SYSTEM WILL CONTINUE EAST INTO THE CENTRAL AND SOUTHERN ROCKIES SUNDAY. LINGERING SHOWERS AND THUNDERSTORMS WILL EXIST OVER THE SOUTHERN AND EASTERN MOUNTAINS AND THE SOUTHEAST VALLEYS OF UTAH ON SUNDAY. HIGH PRESSURE ALOFT WILL MOVE INTO NORTHWEST UTAH BEHIND THE EXITING LOW PRESSURE LATE SUNDAY...THEN SPREAD INTO THE REMAINDER OF THE STATE EARLY NEXT WEEK. DRY CONDITIONS WITH TEMPERATURES RUNNING AT OR A LITTLE ABOVE NORMAL ARE ANTICIPATED FOR MEMORIAL DAY. BREEZY AND WARM CONDITIONS WILL DEVELOP ACROSS THE OUTLOOK AREA BY WEDNESDAY. THE NEXT STORM SYSTEM MOVING THROUGH THE PACIFIC NORTHWEST WILL NUDGE A COLD FRONT INTO NORTHWEST UTAH BY THURSDAY. WINDY AND WARM CONDITIONS WITH ISOLATED AFTERNOON THUNDERSTORMS WILL EXIST AHEAD OF THE FRONT...WITH COOLER AND GENERALLY DRY CONDITIONS BEHIND THE FRONT THURSDAY AFTERNOON. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES. 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
The Cedar City radar (KICX), 189 km away, was scanning. The volume nearest the first event began at 20:12 UTC.
1 thunderstorm wind, 1 flash flood. Local standard time, as filed.
A windy thunderstorm moved over Lake Powell, causing a houseboat to be blown into a cliff. One sensor nearby at Bullfrog Marina recorded a peak wind gust of 39 mph.
A visitor to Capitol Reef National Park reported a flash flood in the Cottonwood Wash.
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, May 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: 515638, 515662.