Several rounds of thunderstorms across southeast Utah caused heavy rainfall which produced flash floods from Arches National Park to near Monticello.
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 GJT wrote it up.
Several rounds of thunderstorms across southeast Utah caused heavy rainfall which produced flash floods from Arches National Park to near Monticello.
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 Grand Junction, CO wrote its last area forecast discussion before the first event at Aug 4, 10:02 AM MST, 1 hour 13 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GRAND JUNCTION CO 1102 AM MDT MON AUG 4 2014 .UPDATE... ISSUED AT 1042 AM MDT MON AUG 4 2014 HRRR SHORT TERM MODEL DOING WELL WITH PRECIPITATION TODAY. NO CHANGES TO CURRENT GRIDS AS WIDESPREAD THREAT OF SHOWERS AND THUNDERSTORMS IS COVERED IN MORNING FORECAST PACKAGE. TEMPS WILL REMAIN BELOW NORMAL TODAY ACROSS THE AREA WITH WIDESPREAD CLOUD COVER AND DEVELOPING STORMS. && .SHORT TERM...(TODAY THROUGH TUESDAY) ISSUED AT 330 AM MDT MON AUG 4 2014 DEEP UPPER LEVEL LOW OVER NEVADA WILL BE SLOWLY LIFTING NORTH AND FILLING OVER THE NEXT 24 HOURS. DEEPER MOISTURE NOW IN PLACE ACROSS THE FORECAST AREA WITH NOSE OF 30-40KT SPEED MAX NOW MOVING THROUGH THE FOUR CORNERS REGION. MORNING SHOWERS AND EMBEDDED THUNDERSTORMS WILL CONTINUE...WITH COVERAGE EXPANDING AND INTENSIFYING A BIT AROUND MIDDAY AS ANOTHER PIECE OF ENERGY ROTATES THROUGH. IMPROVED SHEAR PROFILE SHOULD LEAD TO STRONGER AND LONGER LIVED STORMS TODAY...WITH POTENTIAL FOR HEAVY RAIN AND GUSTY OUTFLOW WINDS. STORM MOTION IS EXPECTED TO REMAIN IN THE 20 TO 30 MPH RANGE THROUGH THE DAY WHICH WILL LIMIT RAINFALL A BIT. WITH INCREASED STORM MOTION...GUSTY OUTFLOW WINDS WILL BE AN INCREASING CONCERN...ALONG WITH NARROW...BUT HEAVY...BANDS OF PRECIP. RAINFALL OVER THE PAST TWO DAYS...WHILE WIDESPREAD...HAS BEEN LIMITED TO UNDER A QUARTER INCH IN MOST AREAS AND SOILS HAVE HAD SOME TIME TO RECOVER FROM THE HEAVY RAINS EARLY LAST WEEK. AS A RESULT...WILL NOT BE ISSUING ANOTHER FLASH FLOOD WATCH FOR EASTERN UTAH OR WESTERN COLORADO...ALTHOUGH LOCALIZED RUNOFF PROBLEMS MAY OCCUR DIRECTLY UNDER THE STRONGER CELLS. BREAKS IN CLOUD COVER EXPECTED TO FILL RATHER QUICKLY IN MOISTURE AND UNSTABLE ENVIRONMENT AND WITH DEW POINTS BACK UP INTO THE 50S...AFTERNOON MAX TEMPS WILL BE DOWN A FEW DEGREES FROM SUNDAY HIGHS. WILL GEAR FORECAST CLOSER TO THE COOLER MET NUMBERS TODAY. EJECTING SHORTWAVE CROSSES THE FORECAST AREA TONIGHT AS THE MAIN UPPER LOW/TROUGH OVER CA/NV CONTINUES LIFTING NORTH. MARGINAL 0-6 KM VERTICAL SHEAR WITH THIS DISTURBANCE SHOULD HELP SUSTAIN SOME NOCTURNAL SHOWERS AND THUNDERSTORMS TONIGHT. DRIER AIR BEGINS TO POKE INTO THE SOUTH ON TUESDAY...BUT RESIDUAL MOISTURE AND INSTABILITY ALONG WITH ANY WEAK DISTURBANCE WILL PRODUCE ANOTHER DAY OF SCATTERED SHOWERS AND THUNDERSTORMS. PRECIPITABLE WATER VALUES DROPPING TO AROUND 1/2 INCH AND STORM MOVEMENT WILL LESSEN THE THREAT OF FLASH FLOODING TUESDAY. .LONG TERM...(TUESDAY NIGHT THROUGH SUNDAY) ISSUED AT 330 AM MDT MON AUG 4 2014 DRIER SOUTHWEST FLOW BECOMES BETTER ESTABLISHED TUE NIGHT AND WEDNESDAY AS THE UPPER LOW OVER CA DEVELOPS INTO A POSITIVELY TILTED TROUGH...WITH THE TROUGH AXIS STRETCHING FROM SAN FRANCISCO TO SRN ID. ISOLATED TO SCATTERED THUNDERSTORMS ARE POSSIBLE OVER THE CENTRAL AND NORTH WITH DAYTIME HEATING...BUT THE MAJORITY OF THE AREA WILL STAY DRY. WITH DRIER AIR AND MORE SUNSHINE...EXPECT WARMER TEMPS AS WELL ON WEDNESDAY. WESTERN TROUGH FILLS AND LIFTS NORTHEAST THURSDAY...WITH WEAK PUSH OF MOISTURE SLIDING INTO OUR NORTHERN ZONES. THIS WILL TRIGGER ISOLATED TO SCATTERED MOUNTAIN CONVECTION...GENERALLY ALONG AND NORTH OF INTERSTATE 70 THURSDAY AFTERNOON AND EVENING. BROAD FLAT RIDGE CENTERED NEAR OKLAHOMA ON FRIDAY WILL SLIP BACK TO THE WEST OVER THE TEXAS PANHANDLE BY SATURDAY AS PACIFIC ENERGY CARVES OUT ANOTHER LONG WAVE TROUGH OVER THE FAR WESTERN STATES. THIS SHOULD DRAW UP ANOTHER PUSH OF MOISTURE INTO OUR SOUTHERN ZONES SATURDAY AFTERNOON WITH SCATTERED CONVECTION EXPECTED. HIGH REMAINS PARKED OVER WEST TEXAS ON SUNDAY WITH MOISTURE CONTINUING TO WORK BACK NORTHWARD AND INTO WESTERN COLORADO. SO TRENDING BACK TOWARD MORE NORMAL SUMMER PATTERN VERSUS EARLIER ADVERTISED DRYING TREND THROUGH THE EXTENDED. WILL KEEP POPS LOW FOR NOW AS MODELS CONVERGE ON A SOLUTION. EXPECT TEMPS TO REMAIN NEAR SEASONAL NORMS THROUGH THE PERIOD. && .AVIATION...(FOR THE 18Z TAFS THROUGH 18Z TUESDAY AFTERNOON) ISSUED AT 1042 AM MDT MON AUG 4 2014 BAND OF RAIN AND WEAKER THUNDERSTORMS CURRENTLY ACROSS WESTERN COLORADO WILL CONTINUE TO MOVE NORTHEAST. THUNDERSTORMS WILL DEVELOP BEHIND THIS LINE THROUGHOUT THE AFTERNOON...WITH STRONGER THUNDERSTORMS ALREADY DEVELOPING NEAR KCNY THIS MORNING AND MOVING NORTHEAST. EXPECTING STORMS TO STICK TOGETHER TODAY WHICH WILL AFFECT MANY TAF SITES. HEAVY RAIN AND GUSTY WINDS TO 40 MPH POSSIBLE NEAR THE STRONGEST STORMS. CIGS AND VSBYS WILL DROP INTO MVFR AT TIMES THROUGHOUT THE AFTERNOON. && .GJT WATCHES/WARNINGS/ADVISORIES... CO...NONE. UT...NONE. && UPDATE...JAM SHORT TERM...JDC/JAD LONG TERM...JAD/JDC AVIATION...JAM
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
The Grand Junction radar (KGJX), 126 km away, was scanning. The volume nearest the first event began at 18:16 UTC.
2 flash flood. Local standard time, as filed.
Delicate Arch Road was closed for the day due to fast moving water up to a half foot deep that ran across the roadway.
Mud and water up to 6 inches deep was reported to be flowing over Highway 191 just north of Monticello.
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: 545413, 545403.