An upper level disturbance moved across western Colorado resulting in thunderstorm development across the area.
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.
An upper level disturbance moved across western Colorado resulting in thunderstorm development across the area.
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 Sep 16, 3:00 AM MST, 10 hours earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GRAND JUNCTION CO 400 AM MDT SUN SEP 16 2007 .SHORT TERM (TODAY THROUGH MONDAY NIGHT)... SECOND STRAIGHT NIGHT WITH PERSISTENT NOCTURNAL CONVECTION OVER MUCH OF NORTHERN AND CENTRAL COLORADO WITH A FEW STORMS OVER THE SAN JUAN MOUNTAINS TO THE SOUTH. NOT MUCH CHANGED IN THE PAST 24 HOURS WITH RESPECT TO POSITIONING OF THE LOW PRESSURE SYSTEM OVER THE WEST COAST. AS A RESULT...THE JET STREAM REMAINED ALIGNED OVER THE NORTHERN PORTION OF THE CWFA WITH A WIDE AREA OF MID-LEVEL DIFLUENCE OVERHEAD. NOSE OF AN 80-85 KT JET COMBINED WITH MID-LEVEL DIFLUENCE WILL CONTINUE TO PROVIDE LIFT WHILE PACIFIC MOISTURE PROVIDES FUEL FOR ISOLATED THUNDERSTORMS ACROSS MUCH OF THE CWFA THIS MORNING. TROF AXIS OVER THE WEST COAST WILL FINALLY SWING INLAND DURING THE DAY. AS THIS OCCURS...DEEPER MOISTURE FROM THE SOUTH WILL BECOME ENTRAINED INTO THE SOUTHWEST FLOW. LARGE SCALE ASCENT COMBINED WITH DIURNAL WARMING WILL BRING AN INCREASE IN SHOWER AND THUNDERSTORM ACTIVITY DURING THE AFTERNOON. STRONG DYNAMIC FORCING ASSOCIATED WITH RIGHT ENTRANCE REGION OF DEPARTING JET STREAK...ENHANCED BY LEFT EXIT REGION OF AN APPROACHING JET STREAK LATER TONIGHT WILL RESULT IN WIDESPREAD SHOWERS AND THUNDERSTORMS. EXPECT WET PATTERN TO CONTINUE INTO MONDAY AS JET STREAK MOVING THROUGH THE BASE OF THE WESTERN TROF NOSES INTO CENTRAL COLORADO COINCIDING WITH A SHORTWAVE EJECTING EASTWARD ACROSS THE AREA. MAIN TROF AXIS MOVES ACROSS THE CWFA MONDAY NIGHT BRINGING DRYING TO THE WESTERN ZONES LATE WHILE SHOWERS AND THUNDERSTORMS LINGER OVER THE COLORADO MOUNTAIN ZONES. TEMPERATURES LARGELY UNCHANGED TODAY WITH BREEZY SOUTHWEST FLOW REDEVELOPING IN THE AFTERNOON. MARKEDLY COOLER HIGHS EXPECTED ON MONDAY AS MOSTLY CLOUDY AND WET CONDITIONS LIMIT WARMING. OVERNIGHT LOWS WILL REMAIN MODERATE UNDER MOIST AND MOSTLY CLOUDY CONDITIONS. .LONG TERM...(TUESDAY THROUGH SATURDAY)... A DRY WEST FLOW ON TUESDAY QUICKLY BACKS TO SW AND THEN SOUTH TOWARDS THE WEEKEND AS A PACIFIC LOW DEEPENS ALONG THE WEST COAST. GENERALLY THIS WILL BRING ABOVE NORMAL TEMPERATURES AND INCREASING GRADIENT WINDS LATE IN THE PERIOD. THE MODELS ARE STRUGGLING WITH THIS CLOSED LOW WITH THE EC BEING THE MOST CONSISTENT. PLENTY OF UNCERTAINTY WITH LOW POSITION AND PROGRESSION AND HOW MUCH MOISTURE WILL BE ADVECTED FROM THE SOUTH. FOR THIS FORECAST LOWERED SOUTHERN POPS FOR FRIDAY BUT KEPT A MENTION FOR NEXT SATURDAY. RAMEY && .AVIATION... VFR CONDITIONS WILL CONTINUE ACROSS THE REGION TODAY. HOWEVER... ISOLATED SHOWERS AND THUNDERSTORMS WILL CONTINUE THIS MORNING INCREASING IN AREAL COVERAGE THIS AFTERNOON. BREEZY SOUTHWEST SURFACE WINDS IN COMBINATION WITH THUNDERSTORM OUTFLOW WINDS COULD PRODUCE WIND GUSTS UP TO 40 MPH DURING THE AFTERNOON AND EARLY EVENING HOURS. CONDITIONS WILL BE DETERIORATING TONIGHT AS INCREASING MOISTURE FROM THE SOUTH PRODUCES WIDESPREAD RAINFALL...MOUNTAIN OBSCURATION...AND AREAS OF MVFR CIGS/VSBYS BY LATE TONIGHT...CONTINUING THROUGH MONDAY. && .GJT WATCHES/WARNINGS/ADVISORIES... .CO...NONE. .UT...NONE. SHORT TERM...NL LONG TERM....JOE AVIATION.....JRP/NL
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE GRAND JUNCTION CO 133 PM MDT SUN SEP 16 2007 COZ001>014-017>023-UTZ022>025-027>029-170200- 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- 133 PM MDT SUN SEP 16 2007 ...SEVERE THUNDERSTORM WATCH IN EFFECT FOR MOST OF EASTERN UTAH AND WESTERN COLORADO UNTIL 8 PM MDT... THIS HAZARDOUS WEATHER OUTLOOK IS FOR EASTERN UTAH AND WESTERN COLORADO. .DAY ONE...REST OF TODAY AND TONIGHT SCATTERED THUNDERSTORMS WILL OCCUR THROUGH THIS AFTERNOON AND EVENING. SOME SEVERE STORMS ARE POSSIBLE THIS AFTERNOON AND EARLY EVENING...WITH LARGE HAIL AND DAMAGING WINDS. HEAVY DOWNPOURS WILL ACCOMPANY SOME STORMS AS WELL. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY WIDESPREAD SHOWERS AND THUNDERSTORMS WILL CONTINUE MONDAY THROUGH MONDAY NIGHT. AFTER A BRIEF DRY PERIOD AT MIDWEEK...THERE WILL BE A SLIGHT CHANCE OF THUNDERSTORMS THURSDAY NIGHT THROUGH SATURDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL BE NEEDED THIS AFTERNOON. PLEASE RELAY REPORTS OF HAIL...STRONG OR DAMAGING WINDS...AND HEAVY RAIN TO THE NATIONAL WEATHER SERVICE IN GRAND JUNCTION. TAL
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
113 PM MDT SUN SEP 16 2007
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0100 PM TSTM WND GST 1 E GYPSUM 39.64N 106.93W
09/16/2007 M62 MPH EAGLE CO AWOS
OCCURRED AT THE EAGLE COUNTY REGIONAL AIRPORT.
&&
JPRINGLEThe Grand Junction radar (KGJX), 154 km away, was scanning. The volume nearest the first event began at 20:00 UTC.
9 heavy rain, 1 funnel cloud, 1 hail. Local standard time, as filed.
Rainfall of 2.35 inches occurred and caused localized flooding of a field and a driveway on the property of a COOP Observer. Water also washed boulders bigger than basketballs off a mountain just east of the property.
Rainfall of .65 inches fell in 10 minutes.
Rainfall of .50 inches fell in 4 minutes with a total of .60 inches in 6 minutes.
Rainfall of .50 inches fell in 15 minutes.
Rainfall of .60 inches fell in 5 minutes. Runoff formed a stream of water through a yard. A rockslide was observed on a hill north of the spotters location.
Rainfall of .56 inches fell in 5 minutes.
Heavy rain producing thunderstorms caused minor flooding in a number of locations along Highway 64 between Rangely and Meeker.
Hail from penny-size to quarter-size in diameter occurred in Meeker.
One inch of rain fell in 15 minutes.
Runoff from heavy rain caused mud to flow into some yards on the north side of Interstate 70 near Mile Marker 101.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Colorado in 2007Every state in 2007This day in weather historyWarnings in Colorado, September 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: 60594, 60598, 60599, 60597, 60600, 60596, 60595, 60396, 60397, 60593, 60592.