The remnants of an Eastern Pacific tropical weather system brought a large amount of moisture to the intermountain west during the second week of June. This moisture led to widespread precipitation, some from heavy rainfall producing thunderstorms, which in turn produced areas of flooding across portions of Western Colorado on June 10th.
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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.
The remnants of an Eastern Pacific tropical weather system brought a large amount of moisture to the intermountain west during the second week of June. This moisture led to widespread precipitation, some from heavy rainfall producing thunderstorms, which in turn produced areas of flooding across portions of Western Colorado on June 10th.
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 Jun 10, 6:40 AM MST, 2 hours 45 minutes earlier.
SYNGJT FOR EASTERN UTAH AND WESTERN COLORADO, HERE IS THE LATEST WEATHER SYNOPSIS. REMNANTS OF TROPICAL DEPRESSION BLANCA, COMBINED WITH A TROUGH OF LOW PRESSURE SLOWLY MOVING INTO THE GREAT BASIN THIS AFTERNOON, WILL ALLOW FOR WIDESPREAD SHOWERS AND THUNDERSTORMS ACROSS THE REGION TODAY. THIS TROUGH OF LOW PRESSURE WILL SLOWLY MOVE THROUGH THE FORECAST AREA DURING THE LATTER HALF OF THE WEEK, LEADING TO WET WEATHER AND INCREASING CHANCES OF SHOWERS AND STORMS WITH POTENTIAL FOR HEAVY RAIN. WET AND UNSETTLED CONDITIONS WILL LINGER THROUGH MONDAY, BEFORE DRIER AIR MOVES IN.
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE GRAND JUNCTION CO 529 AM MDT WED JUN 10 2015 COZ001>014-017>023-UTZ022>025-027>029-111200- 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- 529 AM MDT WED JUN 10 2015 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EASTERN UTAH AND WESTERN COLORADO. .DAY ONE...TODAY AND TONIGHT SHOWERS AND THUNDERSTORMS...SOME HEAVY...WILL MOVE ACROSS THE FORECAST AREA TODAY AND CONTINUE THROUGH THIS EVENING. HEAVY RAINFALL WILL INCREASE AS THE DAY PROGRESSES INCREASING FLASH FLOOD POTENTIAL SO A FLASH FLOOD WATCH HAS BEEN ISSUED. SHOWERS WILL CONTINUE OVERNIGHT. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY LITTLE CHANGE THROUGH TUESDAY AS MOISTURE REMAINS IN THE AREA BRINGING AFTERNOON SHOWERS AND STORMS. FROM SUNDAY ONWARDS...HIGHER TERRAIN WILL BE FAVORED FOR CONVECTION. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED TODAY OR TONIGHT...HOWEVER SPOTTERS ARE ENCOURAGED TO RELAY RAINFALL AMOUNTS OR ANY OBSERVED FLOODING TO THE GRAND JUNCTION FORECAST OFFICE.
The Grand Junction radar (KGJX), 214 km away, was scanning. The volume nearest the first event began at 16:26 UTC.
2 heavy rain, 1 flash flood. Local standard time, as filed.
A rainfall total of 0.94 inches fell within about 15 minutes which resulted in minor flooding.
A strong thunderstorm produced heavy rainfall within a short period of time which produced minor flooding. Radar estimated rainfall amounts were in excess of an inch in some places. Rainfall measurements up to 0.95 of an inch were measured in the western portion of Grand Junction.
Heavy rainfall resulted in flash flooding across a remote section of Highway 141.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Colorado in 2015Every state in 2015This day in weather historyWarnings in Colorado, June 2015
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: 641318, 641313, 641312.