Heavy rainfall resulted in a flash flood across a section of Highway 133.
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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 GJT wrote it up.
Heavy rainfall resulted in a flash flood across a section of Highway 133.
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 Jul 30, 9:47 AM MST, 1 hour 58 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GRAND JUNCTION CO 1047 AM MDT MON JUL 30 2012 .SHORT TERM...(TODAY THROUGH TUESDAY) ISSUED AT 300 AM MDT MON JUL 30 2012 MONSOONAL MOISTURE CONTINUES TO STREAM UP FROM THE SOUTH THIS MORNING WITH SOME WEAK DISTURBANCES FIRING OFF CONVECTION FOR SOUTHEASTERN UTAH AND EXTREME SOUTHERN COLORADO. WATER VAPOR IMAGERY WAS HIGHLIGHTING AN AREA OF DRIER AIR OVER NEW MEXICO THAT APPEARED TO BE ENTERING COLORADO BUT OVER LAST FEW HOURS...MOISTURE HAS INCREASED IN THIS VICINITY. LOCAL SURFACE DEWPOINTS ARE ALSO INCREASING IN THIS AREA INDICATING DRY AIR BECOMING MOISTER AS MORNING PROGRESSES. BOTH GFS/NAM WERE PICKING UP ON THIS DRIER AIR AND FOCUSED THE HEAVIER QPF NORTH OF INTERSTATE 70 TODAY WHERE MOISTURE TRANSPORT VECTORS CLEARLY BRING BULK OF MOISTURE. WHILE CONVECTION DOES APPEAR FAVORED OVER THE NORTH...THE FORECAST KEEPS ISOLATED TO SCATTERED THUNDERSTORMS OVER ENTIRE FORECAST AREA FROM NOON ONWARDS AS ANY WEAK SHORTWAVE OR DISTURBANCE WILL CAUSE CONVECTION TO FORM. CONTINUED CLOUD COVER SHOULD KEEP HIGH TEMPERATURES A FEW DEGREES BELOW NORMAL FOR THIS TIME OF YEAR. MONDAY NIGHT-TUESDAY...DEEP MOISTURE REMAINS IN PLACE OVER THE CWA. SOUTHWEST FLOW ALOFT STRENGTHENS WITH STORM MOTION INCREASING TO 15 KTS SOUTH. THIS WILL NOT ELIMINATE THE THREAT OF LOCALIZED FLOODING. TEMPERATURES WILL BE NEAR NORMAL. .LONG TERM...(TUESDAY NIGHT THROUGH SUNDAY NIGHT) ISSUED AT 300 AM MDT MON JUL 30 2012 TUESDAY NIGHT-WEDNESDAY...BOTH THE NAM AND GFS SHOW WEAK DISTURBANCES WORKING THROUGH THE FOUR CORNERS TUESDAY NIGHT AND SHEARING NORTHWARD ON WEDNESDAY. THIS MAY ENHANCE CONVECTIVE ACTIVITY OVER EASTERN UTAH AND SW COLORADO. PRECIPITABLE WATER VALUES LOWER TO BELOW ONE INCH ACROSS THE NORTH AS THE FLOW BACKS TO WEST. FORECAST MODELS IN GENERALLY GOOD AGREEMENT FOR REMAINDER OF LONG- TERM WITH HIGH PRESSURE STILL OVER NEW MEXICO AND TEXAS. MONSOONAL MOISTURE IS EXPECTED TO CONTINUE STREAMING OVER AREA THROUGH SUNDAY KEEPING SHOWERS AND STORMS IN THE FORECAST. A CLOSED AREA OF LOW PRESSURE AND ASSOCIATED TROUGH WILL BRUSH NORTHERN UTAH AND COLORADO FRIDAY BUT THE SYSTEM WILL MOVE THROUGH VERY QUICKLY AND MAY CAUSE A SLIGHT DOWNTURN IN PRECIPITATION FOR AREAS NORTH BUT BY SATURDAY MOISTURE RETURNS TO ALL AREAS. SUFFICE TO SAY...LONG- TERM WILL BE VERY UNSETTLED AS AMPLE MOISTURE REMAINS OVER AREA AND WEAK DISTURBANCES FIRE OFF DAILY SHOWERS AND STORMS. && .AVIATION...(FOR THE 18Z TAFS THROUGH 18Z TUESDAY AFTERNOON) ISSUED AT 1047 AM MDT MON JUL 30 2012 CONDITIONS WILL BE SIMILAR TO THOSE EXPERIENCED OVER THE PAST SEVERAL DAYS. DAY TIME HEATING WILL RESULT IN SCATTERED TO NUMEROUS SHOWERS AND THUNDERSTORMS PRODUCING HEAVY RAIN AND OUTFLOW WINDS FROM 30 TO 40 MPH. EXPECT MOUNTAINS TO BE FREQUENTLY OBSCURED BY RAIN. AREA AIRPORTS HAVE A GOOD CHANCE OF EXPERIENCING MVFR CIGS AND VSBY IN HEAVY RAIN WITH BRIEF IFR VSBY ALSO POSSIBLE. CONDITIONS IMPROVE AFTER 03Z THIS EVENING AS COOLING REDUCES STORM INTENSITY. VFR CONDITIONS ARE EXPECTED TO DOMINATE FROM LATE EVENING... OVERNIGHT...AND THROUGH TUESDAY MORNING. ISOLATED TO SCATTERED LIGHT SHOWERS ARE LIKELY DURING THIS PERIOD...THOUGH A REDUCTION IN FLIGHT CATEGORIES IS UNLIKELY. && .GJT WATCHES/WARNINGS/ADVISORIES... CO...NONE. UT...NONE. && SHORT TERM...TGR/JOE LONG TERM...JOE/TGR AVIATION...NL
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE GRAND JUNCTION CO 533 AM MDT MON JUL 30 2012 COZ001>014-017>023-UTZ022>025-027>029-311145- LOWER YAMPA RIVER BASIN-CENTRAL YAMPA RIVER BASIN- ROAN AND TAVAPUTS PLATEAUS-ELKHEAD AND PARK MOUNTAINS- UPPER YAMPA RIVER BASIN-GRAND VALLEY-DEBEQUE TO SILT CORRIDOR- CENTRAL COLORADO RIVER BASIN-GRAND AND BATTLEMENT MESAS- GORE AND ELK MOUNTAINS/CENTRAL MOUNTAIN VALLEYS- CENTRAL GUNNISON AND UNCOMPAHGRE RIVER BASIN- WEST ELK AND SAWATCH MOUNTAINS-FLATTOPS- UPPER GUNNISON RIVER VALLEY-UNCOMPAHGRE PLATEAU AND DALLAS DIVIDE- NORTHWEST SAN JUAN MOUNTAINS-SOUTHWEST SAN JUAN MOUNTAINS- PARADOX VALLEY/LOWER DOLORES RIVER- FOUR CORNERS/UPPER DOLORES RIVER-ANIMAS RIVER BASIN- SAN JUAN RIVER BASIN-SOUTHEAST UTAH-EASTERN UINTA MOUNTAINS- EASTERN UINTA BASIN-TAVAPUTS PLATEAU-ARCHES/GRAND FLAT- LA SAL AND ABAJO MOUNTAINS-CANYONLANDS/NATURAL BRIDGES- 533 AM MDT MON JUL 30 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EASTERN UTAH AND WESTERN COLORADO. .DAY ONE...TODAY AND TONIGHT SHOWERS AND STORMS WILL DEVELOP OVER MANY PLACES TODAY WITH LOCALLY HEAVY RAINFALL BEING THE BIGGEST CONCERN. SOME OF THE STORMS WILL PERSIST THROUGH THE NIGHT TIME HOURS. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY SHOWERS AND STORMS WILL CONTINUE THROUGH SUNDAY THOUGH ACTIVITY WILL DIMINISH SOME FRIDAY INTO SATURDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED.
The Grand Junction radar (KGJX), 91 km away, was scanning. The volume nearest the first event began at 18:46 UTC.
1 flash flood. Local standard time, as filed.
Heavy rainfall resulted in a flash flood across a section of Highway 133 about six miles south of Carbondale. The flash flood deposited mud and debris up to three feet deep on the highway. Highway 133 was closed for nearly three hours due to this event.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Colorado in 2012Every state in 2012This day in weather historyWarnings in Colorado, July 2012
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: 395965.