Alert archive / Colorado / Flash Flood Warnings in 2015
Flash Flood Warning 15, NWS Grand Junction, CO
NWS Grand Junction, CO issued this flash flood warning at Aug 3, 2015, 5:41 PM MDT for Dolores County, San Miguel County, Colorado; San Juan County, Utah. It was in force for 2 hr. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Aug 3, 2015, 5:41 PM MDT (23:41 UTC)
- Expired
- Aug 3, 2015, 7:45 PM MDT
- In force
- 2 hr
- Issued by
- NWS Grand Junction, CO
- Area
- Storm-based polygon
- Flood severity
- None
Counties Dolores County, CO, San Miguel County, CO, San Juan County, UT
The radar
The Grand Junction radar (KGJX), 153 km from the middle of the area, began a volume at 23:44 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Grand Junction, CO (KGJT), launched 12:00Z, 11.7 hours before the alert went out and 153 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 37 J/kg
- Mixed-layer CIN
- -97 J/kg
- Mixed-layer LCL
- 1396 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 68 m²/s²
- 0-3 km storm-relative helicity
- 113 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this flash flood warning went out, 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 this flash flood warning went out at Aug 3, 5:38 PM MDT, 3 minutes earlier.
Area forecast discussion, Aug 3, 5:38 PM MDT, 3 minutes before
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</html>Hazardous weather outlook, Aug 3, 5:30 AM MDT, 12 hours 11 minutes before
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
In the hours before
Special weather statement, Aug 3, 2:16 PM MDT, 3 hours 25 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE GRAND JUNCTION CO 216 PM MDT MON AUG 3 2015 COZ008>010-012-013-032045- GRAND AND BATTLEMENT MESAS CO-CENTRAL COLORADO RIVER BASIN CO- FLATTOPS CO-WEST ELK AND SAWATCH MOUNTAINS CO- GORE AND ELK MOUNTAINS/CENTRAL MOUNTAIN VALLEYS CO- 216 PM MDT MON AUG 3 2015 ...SIGNIFICANT WEATHER ADVISORY FOR WEST CENTRAL EAGLE...NORTHWESTERN PITKIN AND SOUTHEASTERN GARFIELD COUNTIES UNTIL 245 PM MDT... AT 215 PM MDT...DOPPLER RADAR WAS TRACKING AN AREA OF THUNDERSTORMS NEAR GLENWOOD SPRINGS...MOVING NORTHEAST AT 30 MPH. BRIEF HEAVY RAIN AND OCCASIONAL LIGHTNING CAN BE EXPECTED WITH THE PASSAGE OF THESE STORMS. WINDS IN EXCESS OF 40 MPH WILL ALSO BE POSSIBLE WITH THESE STORMS. LOCATIONS IMPACTED INCLUDE... GLENWOOD SPRINGS...CARBONDALE...DOTSERO...CATTLE CREEK...SHOSHONE AND EL JEBEL. LAT...LON 3919 10749 3949 10749 3974 10712 3951 10692 TIME...MOT...LOC 2015Z 235DEG 25KT 3947 10735 TGR
Local storm report, Aug 3, 4:30 PM MDT, 1 hour 11 minutes before
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</html>Special weather statement, Aug 3, 4:45 PM MDT, 56 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE GRAND JUNCTION CO 445 PM MDT MON AUG 3 2015 COZ019>021-UTZ028-032315- PARADOX VALLEY/LITTLE DOLORES RIVER CO- FOUR CORNERS/UPPER DOLORES RIVER CO-SOUTHWEST SAN JUAN MOUNTAINS CO- LA SAL AND ABAJO MOUNTAINS UT- 445 PM MDT MON AUG 3 2015 ...SIGNIFICANT WEATHER ADVISORY FOR WEST CENTRAL SAN MIGUEL AND NORTHWESTERN DOLORES COUNTIES UNTIL 515 PM MDT... AT 445 PM MDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 7 MILES NORTHWEST OF DOVE CREEK...OR 17 MILES EAST OF MONTICELLO... MOVING NORTHEAST AT 10 MPH. WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH THIS STORM. LOCATIONS IMPACTED INCLUDE... DOVE CREEK...UCOLO AND EGNAR. LAT...LON 3770 10904 3786 10914 3801 10891 3777 10875 TIME...MOT...LOC 2245Z 242DEG 8KT 3782 10901 JAM
Local storm report, Aug 3, 4:58 PM MDT, 43 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
458 PM MDT MON AUG 03 2015
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0456 PM HAIL 1 SE STEAMBOAT SPRINGS 40.47N 106.81W
08/03/2015 E0.25 INCH ROUTT CO TRAINED SPOTTER
1 SE OF SBS .31 IN 20 MIN. PEA SIZED HAIL
&&
EVENT NUMBER GJT1500953
ADLThe office that day
Everything else NWS Grand Junction, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 2, 6:17 PM MDT | Special Weather Statement | GJT | Garfield | 43 min |
| Aug 2, 7:38 PM MDT | Special Weather Statement | GJT | Moffat | 52 min |
| Aug 3, 2:16 PM MDT | Special Weather Statement | GJT | Pitkin | 29 min |
| Aug 3, 4:45 PM MDT | Special Weather Statement | GJT | Dolores | 30 min |
| Aug 3, 5:59 PM MDT | Areal Flood Advisory | GJT | Dolores | 3 hr |
| Aug 2, 7:25 PM MDT | Flash Flood Warning | GJT | San Juan | 3 hr |
Nearby
Flash Flood Warnings in Colorado, 2015Flash Flood Warnings in Utah, 2015Every flash flood warning in 2015
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.