Heavy rain producing thunderstorms caused flash flooding near Jarvie Ranch.
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The episode as NWS GJT wrote it up.
Heavy rain producing thunderstorms caused flash flooding near Jarvie Ranch.
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 3, 3:30 AM MST, 7 hours 30 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GRAND JUNCTION CO 430 AM MDT FRI AUG 3 2007 .SHORT TERM...TODAY THROUGH SATURDAY NIGHT... PRECIPITABLE WATER EXCEEDING AN INCH HAVE BEEN FAIRLY COMMON DURING THE 12Z UPPER AIR RUN...BUT YESTERDAY WAS THE FIRST 00Z RUN THAT I HAVE SEEN THAT SURPASSED AN INCH. THIS IS INDICATIVE OF THE DEEP LAYERED MOISTURE THAT COVERS THE ENTIRE FORECAST AREA...SO NOT TOO SURPRISING THAT SCATTERED SHOWERS WITH ISOLATED LIGHTNING HAVE BEEN SLOW TO DIMINISH OVERNIGHT. WEAK SHORT WAVE PASSING WYOMING TODAY KEEPS THE 700 MB FLOW AT 15 TO 20 KNOTS. JUST ENOUGH SPEED TO KEEP STORMS FROM PRODUCING TOO MUCH RAIN AT ANY GIVEN SPOT. WITH SURFACE DEW POINTS IN THE MID 50S COMMON...MANY STORMS WILL BE HEAVY RAINERS AND COULD PRODUCE SOME URBAN AND/OR SMALL STREAM FLOODING THIS AFTERNOON INTO THE EVENING HOURS. MOISTURE PLUME TAKES A MORE SOUTHWEST TO NORTHEAST TILT ONCE THE WYOMING SHORT WAVE MOVES INTO THE NRN PLAINS. MOISTURE PLUME WILL WILL ERODE OVER THE NORTHWEST AND FAR NORTH OF OUR FORECAST AREA... PRIMARILY AFFECTING NORTHEAST UTAH AND ALONG THE WYOMING BORDER. BUT RICH MOIST AIR WILL STILL EXIST FOR THE REMAINDER OF OUR FORECAST AREA. STORM MOVEMENT WILL BE SLOWER AND THEREFORE A GREATER CHANCE OF HEAVY RAINS PRODUCING LOCALIZED FLOODING. NO ACTION NEEDED FOR THIS FORECAST PACKAGE...BUT FUTURE SHIFTS MAY NEED TO CONSIDER FLASH FLOOD WATCHES FOR SATURDAY AFTERNOON. .LONG TERM...SUNDAY THROUGH FRIDAY... LITTLE CHANGE IN THE EXTENDED PERIODS WITH SOUTH FLOW AROUND THE UPPER HIGH CONTINUING TO BRING MOISTURE INTO EARLY NEXT WEEK. AS THE WEST COAST TROF DEEPENS...DRIER AIR WILL WORK INTO THE NORTHERN ZONES BY MID-WEEK. TEMPERATURES NEAR CLIMATOLOGY. && .AVIATION... MOSTLY VFR CONDITIONS TODAY AND TONIGHT...HOWEVER LOCAL AREAS OF MVFR CONDITIONS MAY OCCUR FROM LOWER CEILINGS AND VISIBILITIES ASSOCIATED WITH HEAVY SHOWERS. MOUNTAINS WILL BE PARTIALLY OBSCURED FROM THESE HEAVY SHOWERS. && .GJT WATCHES/WARNINGS/ADVISORIES... .CO...NONE. .UT...NONE. SHORT TERM...PF LONG TERM...JOE AVIATION...PF
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE GRAND JUNCTION CO 600 AM MDT FRI AUG 3 2007 COZ001>014-017>023-UTZ022>025-027>029-041200- ANIMAS RIVER BASIN-ARCHES/GRAND FLAT-CANYONLANDS/NATURAL BRIDGES- CENTRAL COLORADO RIVER BASIN- CENTRAL GUNNISON AND UNCOMPAHGRE RIVER BASIN- CENTRAL YAMPA RIVER BASIN-DEBEQUE TO SILT CORRIDOR- EASTERN UINTA BASIN-EASTERN UINTA MOUNTAINS- ELKHEAD AND PARK MOUNTAINS-FLAT TOPS- FOUR CORNERS/UPPER DOLORES RIVER- GORE AND ELK MOUNTAINS/CENTRAL MOUNTAINS-GRAND AND BATTLEMENT MESAS- GRAND VALLEY-LA SAL AND ABAJO MOUNTAINS-LOWER YAMPA RIVER BASIN- NORTHWEST SAN JUAN MOUNTAINS-PARADOX VALLEY/LOWER DOLORES RIVER- ROAN AND TAVAPUTS PLATEAUS-SAN JUAN RIVER BASIN-SOUTHEAST UTAH- SOUTHWEST SAN JUAN MOUNTAINS-TAVAPUTS PLATEAU- UNCOMPAHGRE PLATEAU AND DALLAS DIVIDE-UPPER GUNNISON RIVER VALLEY- UPPER YAMPA RIVER BASIN-WEST ELK AND SAWATCH MOUNTAINS- 600 AM MDT FRI AUG 3 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EASTERN UTAH AND WESTERN COLORADO. .DAY ONE...TODAY AND TONIGHT EXPECT SCATTERED TO NUMEROUS SHOWERS AND THUNDERSTORMS TODAY AND THIS EVENING...WITH SOME STORMS CONTINUING AFTER MIDNIGHT. SOME STORMS WILL PRODUCE HEAVY RAIN THAT WILL CAUSE A FEW ARROYOS AND SMALL STREAMS TO QUICKLY FILL OR RUN HIGH WITH FAST FLOWING WATER. THE STRONGER STORMS WILL PRODUCE FREQUENT CLOUD TO GROUND LIGHTNING AND SMALL HAIL. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY ANOTHER ROUND OF SCATTERED SHOWERS AND THUNDERSTORMS CAN BE EXPECTED ON SATURDAY AFTERNOON...MORE NUMEROUS OVER THE SOUTHERN MOUNTAINS. SOME STORMS WILL BE SLOW MOVERS AND PRODUCE HEAVY RAIN. THIS INCREASES THE POSSIBILITY OF LOCALIZED FLASH FLOODING AND URBAN OR SMALL STREAM FLOODING. THE CHANCE OF SHOWERS AND THUNDERSTORMS CONTINUES EACH DAY FROM SUNDAY THROUGH WEDNESDAY. SOME SHOWERS WILL PRODUCE HEAVY RAIN AND CAUSE LOCAL URBAN...SMALL STREAM OR ARROYO FLOODING. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED TODAY OR TONIGHT. HOWEVER... REPORTS RELAYED TO THE NATIONAL WEATHER SERVICE OF HEAVY RAIN... HAIL...AND ANY WEATHER RELATED DAMAGE WOULD BE GREATLY APPRECIATED.
The Grand Junction radar (KGJX), 231 km away, was scanning. The volume nearest the first event began at 17:57 UTC.
1 flash flood. Local standard time, as filed.
Thunderstorms over the Jarvie Ranch and Clay Basin area caused flash flooding. The flow of water in the main drainage was about 18 feet wide and 4 to 5 feet deep.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Utah in 2007Every state in 2007This day in weather historyWarnings in Utah, August 2007
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: 56644.