In a period of relatively quiet weather compared to the rest of the month of July, isolated thunderstorms still formed across Utah. One severe thunderstorm was recorded, while two flash floods occurred in 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.
In a period of relatively quiet weather compared to the rest of the month of July, isolated thunderstorms still formed across Utah. One severe thunderstorm was recorded, while two flash floods occurred in 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 Jul 11, 9:18 AM MST, 3 hours 33 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SALT LAKE CITY UT 1018 AM MDT THU JUL 11 2013 .SYNOPSIS...A MOIST AIRMASS OVER ARIZONA IS BEGINNING TO SURGE NORTHWARD AS SOUTHWEST FLOW DEVELOPS OVER THE GREAT BASIN. THIS PATTERN WILL REMAIN IN PLACE THROUGH NEXT WEEK. && .DISCUSSION...DEEP MONSOONAL MOISTURE HAS MADE A MARKED SURGE NORTH THROUGH THE EASTERN GREAT BASIN STATES OVER LAST 12 HOURS TIME. SURFACE DEWPOINTS REMAIN ON THE DRY SIDE ACROSS NORTHERN PORTIONS OF THE STATE ATTM BUT ARE CLIMBING QUITE RAPIDLY ACROSS THE SOUTH...NOW IN THE LOW TO MID 50S IN MANY AREAS. INCREASING RETURNS ON BOTH KMTX/KICX HAVE SPREAD INTO THE MOUNTAINS AND MOST POINTS WEST BENEATH ROBUST CLOUD SHIELD COVERING MUCH OF THE STATE. ANTICIPATING SCOPE OF SHOWER ACTIVITY WILL INCREASE QUITE RAPIDLY THIS AFTERNOON WITH DESTABILIZATION AS SHORT TERM GUIDANCE SUGGESTS...THOUGH SAID CLOUD COVER WILL LIMIT MAX TEMPS AND AREAL SCOPE OF THUNDERSTORM POTENTIAL THIS AFTERNOON. PRIMARY OPERATIONAL FOCUS TODAY WILL BE MONITORING POTENTIAL FLASH FLOOD THREATS AS THE DAY WEARS ON. RETAINING MODERATE FLASH FLOOD FORECAST FOR THE PARKS AS PLENTY OF MOISTURE ALREADY PRESENT ACROSS THE SOUTH WITH AFOREMENTIONED CLOUD COVER AND LACK OF SIGNIFICANT INSTABILITY THE LIMITING FACTORS TO POTENTIAL DEEP UPDRAFT FORMATION. ANY BREAK TO CLOUD COVER WILL RAPIDLY DESTABILIZE THE ATMOSPHERE THIS AFTERNOON PROMPTING A THREAT OF LOCALLY HEAVY RAIN. SHORT WAVE OVER WESTERN ARIZONA NOTED IN WATER VAPOR SPARKING WIDESPREAD CONVECTION FROM THE GRAND CANYON WEST THROUGH VEGAS THIS MORNING. STEERING FLOW TRACKING THIS FEATURE SLOWLY NORTH NORTHWEST AND EXPECT A SIMILAR TRAJECTORY TO CONTINUE TODAY. HRRR- 3KM HAS LATCHED ONTO THIS AND SUGGESTS POCKETS OF HEAVY RAIN DEVELOPING THIS AFTERNOON ACROSS THE SOUTHWEST FROM ROUGHLY KANAB/BRYCE AND POINTS WEST. NOTED CLEARING IN SATELLITE ATTM COMBINED WITH SHORT WAVE TRACK SUGGESTS AREAS IN AROUND DIXIE/ZION NATIONAL PARK HAVING THE HIGHEST POTENTIAL FOR HEAVY RAINERS AND THUNDERSTORM ACTIVITY. UPDATED EARLIER TO INCREASE POPS ACROSS THE WEST...ADDED MENTION OF THUNDER IN SOUTHWEST THIS MORNING AND INCREASE CLOUD COVER TODAY PER LATEST OBSERVATIONS. LOOKING UPSTREAM...TROUGH OVER THE PACNW REGION WILL SWING WELL NORTH ALONG THE US/CANADA BORDER LATE TODAY INTO TOMORROW MORNING. ASSOCIATED JET WILL GRADUALLY NOSE INTO NORTHERN PORTIONS HOWEVER... FLATTENING RIDGE AND ALLOWING DECENT NEAR 700MB COLD ADVECTION ACROSS THE NORTH/WEST. EXTENSIVE RAINFALL CURRENTLY OVER CENTRAL NEVADA ATTM WILL LIKELY BE MAINTAINED TONIGHT AS BEST FORCING MOVES INTO NORTHERN UTAH/WASATCH FRONT. WILL LOOK HARD AT OVERNIGHT POPS TO SEE IF AN INCREASE IN PRECIP POTENTIAL IS WARRANTED. ACTIVE PATTERN TO BE MAINTAINED THROUGH THE WEEKEND AS RIDGE AXIS REMAINS JUST EAST AND SOUTHERLY MOISTURE TAP REMAINS STOUT WITH PWAT REMAINING AT OR OVER 1 INCH. SUBTLE WAVES WILL LIKELY PROVIDE FOCUSED COVERAGE OF SHOWERS/STORMS THOUGH EACH ONE REMAINS DIFFICULT TO DISCERN UNTIL ROUGHLY A DAY OUT. SUBTLE DRYING FROM THE WEST EARLY NEXT WEEK THOUGH EXPECT REMNANT LOW LEVEL MOISTURE WILL BE CHALLENGING TO SCOUR UNTIL MID/LATE WEEK AT THE EARLIEST. && .AVIATION...LIGHT SOUTHERLY WINDS WILL PREVAIL AT KSLC UNTIL ABOUT 17-18Z THEN SWITCH TO THE NORTHWEST. THERE IS A 20 PERCENT CHANCE THAT WINDS WILL SHIFT BEFORE 17Z. EXTENSIVE CLOUD COVER IS EXPECTED TO PERSIST ACROSS THE TERMINAL TODAY THROUGH TONIGHT WITH CIGS MOSTLY REMAINING ABOVE 7 KFT. THERE IS A 20 PERCENT CHANCE OF A THUNDERSTORM AFFECTING THE TERMINAL DURING THE 21-03Z TIMEFRAME. STEADIER LIGHT RAIN IS POSSIBLE AFTER 03Z WITH A 30 PERCENT CHANCE OF CIGS DROPPING BELOW 7 KFT. && .FIRE WEATHER...MOISTURE IS INCREASING FROM THE SOUTH ACROSS THE DISTRICT TODAY. EXTENSIVE CLOUD COVER ASSOCIATED WITH THIS MOISTURE WILL LIKELY LIMIT BOTH AFTERNOON HEATING AND THUNDERSTORM CHANCES ACROSS THE MOUNTAINS AND WEST. HOWEVER A FEW THUNDERSTORMS ARE STILL EXPECTED TO DEVELOP DURING THE AFTERNOON AND EVENING HOURS. INITIALLY ANY STORMS WHICH FORM WILL LIKELY BE DRY WITH STRONG GUSTY WINDS...ESPECIALLY OVER THE NORTH AND EAST...THEN STORMS SHOULD TRANSITION TO WET BY THIS EVENING. THIS MOISTURE IS EXPECTED TO REMAIN IN PLACE THROUGH THE WEEKEND AND INTO AT LEAST EARLY NEXT WEEK. THIS WILL RESULT IN COOLER TEMPERATURES...HIGHER HUMIDITY...AND A CHANCE FOR SHOWERS AND THUNDERSTORMS CAPABLE OF PRODUCING WETTING RAINS EACH DAY. && .SLC WATCHES/WARNINGS/ADVISORIES... UT...NONE. WY...NONE. && MERRILL/WILENSKY/ROGOWSKI 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 245 AM MDT THU JUL 11 2013 UTZ001>016-019>021-517-518-WYZ021-121300- 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- 245 AM MDT THU JUL 11 2013 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE WESTERN TWO THIRDS OF UTAH AND SOUTHWEST WYOMING. .DAY ONE...TODAY AND TONIGHT MOISTURE WILL OVERSPREAD THE REGION. THIS WILL ALLOW SCATTERED SHOWERS AND THUNDERSTORMS TO DEVELOP. INITIALLY DRY THUNDERSTORMS WILL BRING THE THREAT OF GUSTY AND ERRATIC OUTFLOW WINDS. THIS THREAT WILL MOVE NORTHWARD FROM SOUTHERN UTAH INTO CENTRAL AND WESTERN UTAH AS THE DAY PROGRESSES. WITH DEEPER MOISTURE ESTABLISHING ACROSS SOUTHERN UTAH...THERE WILL BE A THREAT OF FLASH FLOODING FROM LOCALLY HEAVY RAINFALL ESPECIALLY ACROSS BURN SCARS AND SLOT CANYONS. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY LOCALLY HEAVY RAIN AND THE POTENTIAL FOR FLASH FLOODING CAN BE EXPECTED THROUGH EARLY NEXT WEEK. THE THREAT IS GREATEST FOR BURN SCARS AND SLOT CANYONS. .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 TRAVEL IMPACTS VISIT... HTTP://WWW.UDOTTRAFFIC.UTAH.GOV/ROADWEATHERFORECAST.ASPX
The Cedar City radar (KICX), 65 km away, was scanning. The volume nearest the first event began at 19:50 UTC.
2 flash flood, 1 thunderstorm wind. Local standard time, as filed.
Flash flooding occurred in the town of Hildale, closing down the main road through town.
The Arrowhead Summit sensor recorded a maximum wind gust of 62 mph.
Heavy rain caused flash flooding in Washington, resulting in the evacuation of two homes. The homes experienced minor damage from the flood waters, and most of the damage across town was to yards and other outdoor areas.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Utah in 2013Every state in 2013This day in weather historyWarnings in Utah, July 2013
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: 469684, 469313, 471332.