Alert archive / Colorado / Flash Flood Warnings in 2012
Flash Flood Warning 13, NWS Grand Junction, CO
NWS Grand Junction, CO issued this flash flood warning at Jul 31, 2012, 2:23 PM MDT for Ouray County, San Miguel County, Colorado. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Jul 31, 2012, 2:23 PM MDT (20:23 UTC)
- Expired
- Jul 31, 2012, 5:30 PM MDT
- In force
- 3 hr
- Issued by
- NWS Grand Junction, CO
- Area
- Storm-based polygon
- Flood severity
- None
Counties Ouray County, CO, San Miguel County, CO
The radar
The Grand Junction radar (KGJX), 120 km from the middle of the area, began a volume at 20:24 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, 8.4 hours before the alert went out and 135 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1967 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 9 m²/s²
- 0-3 km storm-relative helicity
- 89 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
789 WGUS55 KGJT 312023 FFWGJT COC091-113-312330- /O.NEW.KGJT.FF.W.0013.120731T2023Z-120731T2330Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE GRAND JUNCTION CO 223 PM MDT TUE JUL 31 2012 THE NATIONAL WEATHER SERVICE IN GRAND JUNCTION HAS ISSUED A * FLASH FLOOD WARNING FOR... EASTERN SAN MIGUEL COUNTY IN WEST CENTRAL COLORADO... SOUTH CENTRAL OURAY COUNTY IN SOUTHWEST COLORADO... * UNTIL 530 PM MDT * AT 221 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED SLOW MOVING THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED AREA. RAINFALL RATES OF OVER AN INCH PER HOUR CAN BE EXPECTED. * RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE... AREAS ALONG HIGHWAY 145 AND BETWEEN SAWPIT AND TELLURIDE...AND NEAR THE JUNCTION WITH HIGHWAY 62 LAW ENFORCEMENT OFFICIALS HAVE REPORTED SOME MUDSLIDE OCCURRING IN THIS AREA SO TRAVEL DELAYS CAN BE EXPECTED. DO NOT DRIVE OVER ROADWAYS COVERED IN WATER OR DEBRIS. PRECAUTIONARY/PREPAREDNESS ACTIONS... && LAT...LON 3810 10773 3785 10779 3790 10810 3813 10804 $$ 15
2 follow-up statements
133 WGUS75 KGJT 312122 FFSGJT FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE GRAND JUNCTION CO 322 PM MDT TUE JUL 31 2012 COC091-113-312330- /O.CON.KGJT.FF.W.0013.000000T0000Z-120731T2330Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ SAN MIGUEL CO-OURAY CO- 322 PM MDT TUE JUL 31 2012 ...FLASH FLOOD WARNING REMAINS IN EFFECT FOR SOUTH CENTRAL OURAY AND EASTERN SAN MIGUEL COUNTIES UNTIL 530 PM MDT... AT 320 PM MDT...LOCAL LAW ENFORCEMENT OFFICIALS REPORTED THAT MUD SLIDES HAVE CLOSED HIGHWAY 145 BETWEEN MILE MARKERS 70 AND 74 DUE TO HEAVY RAINFALL AND EXCESS RUNOFF. SOME LOCATIONS THAT WILL CONTINUE EXPERIENCE FLOODING OVER THE NEXT FEW HOURS INCLUDE...SAWPIT AND TELLURIDE...ESPECIALLY ALONG HIGHWAY 145 AND NEAR THE INTERSECTION OF HIGHWAY 145 AND 62. PRECAUTIONARY/PREPAREDNESS ACTIONS... DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS SAFELY. && LAT...LON 3810 10773 3785 10779 3790 10810 3813 10804 $$ DP
211 WGUS75 KGJT 312331 FFSGJT FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE GRAND JUNCTION CO 531 PM MDT TUE JUL 31 2012 COC091-113-312345- /O.EXP.KGJT.FF.W.0013.000000T0000Z-120731T2330Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ SAN MIGUEL CO-OURAY CO- 531 PM MDT TUE JUL 31 2012 ...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR SOUTH CENTRAL OURAY AND EASTERN SAN MIGUEL COUNTIES HAS BEEN ALLOWED TO EXPIRE... EXCESS RUNOFF FROM HEAVY RAIN HAS ENDED OVER THE WARNED AREA. STREAMS AND CREEKS IN THE WARNED AREA HAVE WERE BEGINNING TO RECEDE...ENDING THE FLOOD THREAT. HIGHWAY 145 HAS ALSO BEEN RE-OPENED IN BOTH DIRECTIONS AS OF 530 PM MDT. IF ADDITIONAL FLOODING HAS BEEN OBSERVED...PLEASE REPORT IT TO YOUR LOCAL LAW ENFORCEMENT AGENCY. LAT...LON 3810 10773 3785 10779 3790 10810 3813 10804 $$ DP
The office that day
Everything else NWS Grand Junction, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 31, 3:08 PM MDT | Special Weather Statement | GJT | Montrose | 37 min |
| Jul 31, 3:34 PM MDT | Areal Flood Advisory | GJT | Gunnison, Montrose | 3 hr |
| Jul 31, 4:19 PM MDT | Special Weather Statement | GJT | Montezuma | 41 min |
| Jul 31, 5:00 PM MDT | Areal Flood Advisory | GJT | Montrose | 3 hr |
| Jul 31, 5:10 PM MDT | Special Weather Statement | GJT | Mesa | 50 min |
| Jul 31, 5:21 PM MDT | Flash Flood Warning | GJT | Mesa | 85 min |
| Jul 31, 5:25 PM MDT | Special Weather Statement | GJT | Montezuma | 50 min |
Nearby
Flash Flood Warnings in Colorado, 2012Every flash flood warning in 2012
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.