Alert archive / Colorado / Flash Flood Warnings in 2012
Flash Flood Warning 2, NWS Grand Junction, CO
NWS Grand Junction, CO issued this flash flood warning at Jul 7, 2012, 4:45 PM MDT for Garfield 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 7, 2012, 4:45 PM MDT (22:45 UTC)
- Expired
- Jul 7, 2012, 7:29 PM MDT
- In force
- 3 hr
- Issued by
- NWS Grand Junction, CO
- Area
- Storm-based polygon
- Flood severity
- None
County Garfield County, CO
The radar
The Grand Junction radar (KGJX), 58 km from the middle of the area, began a volume at 22:48 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, 10.8 hours before the alert went out and 72 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
- 107 J/kg
- Mixed-layer CIN
- -174 J/kg
- Mixed-layer LCL
- 1835 m above ground
- 0-6 km bulk shear
- 4 kt
- 0-1 km storm-relative helicity
- -7 m²/s²
- 0-3 km storm-relative helicity
- -29 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
815
WGUS55 KGJT 072245
FFWGJT
COC045-080130-
/O.NEW.KGJT.FF.W.0002.120707T2245Z-120708T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
445 PM MDT SAT JUL 7 2012
THE NATIONAL WEATHER SERVICE IN GRAND JUNCTION HAS ISSUED A
* FLASH FLOOD WARNING FOR...
SOUTH CENTRAL GARFIELD COUNTY IN WEST CENTRAL COLORADO...
* UNTIL 730 PM MDT
* AT 440 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
SLOW MOVING THUNDERSTORMS WITH VERY HEAVY RAINFALL SOUTH OF
INTERSTATE 70 BETWEEN RIFLE AND NEW CASTLE. NATIONAL WEATHER SERVICE
DOPPLER RADAR ESTIMATES NEARLY 2 INCHES OF RAINFALL HAS OCCURRED IN
CACHE...BEAVER AND MAMM CREEKS.
* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
OCCUR WITH MUD AND DEBRIS FLOWS THE PRIMARY THREAT.
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.
FLOODING IS OCCURRING OR IS IMMINENT. MOST FLOOD RELATED DEATHS OCCUR
IN VEHICLES. DO NOT ATTEMPT TO CROSS WATER COVERED BRIDGES...DIPS...
OR LOW WATER CROSSINGS. NEVER TRY TO CROSS A FLOWING STREAM... EVEN A
SMALL ONE...ON FOOT OR IN A VEHICLE.
&&
LAT...LON 3937 10767 3936 10793 3955 10794 3953 10781
3955 10765
$$
JOE2 follow-up statements
702
WGUS75 KGJT 080044
FFSGJT
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
644 PM MDT SAT JUL 7 2012
COC045-080130-
/O.CON.KGJT.FF.W.0002.000000T0000Z-120708T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
GARFIELD CO-
644 PM MDT SAT JUL 7 2012
...FLASH FLOOD WARNING REMAINS IN EFFECT FOR SOUTH CENTRAL GARFIELD
COUNTY UNTIL 730 PM MDT...
EARLIER THIS EVENING...WEATHER SPOTTERS REPORTED THUNDERSTORMS WITH
VERY HEAVY RAINFALL ACROSS THE WARNED AREA. NATIONAL WEATHER SERVICE
DOPPLER RADAR ESTIMATED OVER 2 INCHES OF RAINFALL OCCURRED TO THE
WEST OF DEBEQUE BETWEEN 2:30 AND 3:30 PM THIS AFTERNOON. THERE IS
SOME INDICATION THAT JERRY CREEK TO THE SOUTH OF THE WARNED AREA BUT
NORTH OF CAMEO RECEIVED THE HEAVIEST RAINFALL. AT 6:40 PM MDT...A
LINE OF HEAVY SHOWERS WAS APPROACHING THE WARNED AREA FROM THE
NORTHWEST.
RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
OCCUR.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
IN HILLY TERRAIN...LOW WATER CROSSINGS CAN BE DANGEROUS IN HEAVY
RAIN. DO NOT ATTEMPT TO TRAVEL ACROSS FLOODED ROADS. FIND ALTERNATE
ROUTES. IT ONLY TAKES A FEW INCHES OF SWIFTLY FLOWING WATER TO CARRY
VEHICLES AWAY.
&&
LAT...LON 3937 10767 3936 10793 3955 10794 3953 10781
3955 10765
$$
JOE169
WGUS75 KGJT 080129
FFSGJT
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
729 PM MDT SAT JUL 7 2012
COC045-080144-
/O.CAN.KGJT.FF.W.0002.000000T0000Z-120708T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
GARFIELD CO-
729 PM MDT SAT JUL 7 2012
...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR SOUTH CENTRAL
GARFIELD COUNTY IS CANCELLED...
EXCESS RUNOFF FROM HEAVY RAIN HAS ENDED OVER THE WARNED AREA. STREAMS
AND CREEKS IN THE WARNED AREA HAVE RECEDED OR WERE BEGINNING TO
RECEDE...ENDING THE FLOOD THREAT. IF FLOODING HAS BEEN OBSERVED...
PLEASE REPORT IT TO YOUR LOCAL LAW ENFORCEMENT AGENCY.
LAT...LON 3937 10767 3936 10793 3955 10794 3953 10781
3955 10765
$$
JOEThe office that day
Everything else NWS Grand Junction, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 7, 3:56 AM MDT | Flash Flood Watch | GJT | Archuleta, Delta, Dolores, Eagle, Garfield, Gunnison and 11 more | 17 hr |
| Jul 7, 4:21 PM MDT | Flash Flood Warning | GJT | Gunnison, Pitkin | 3 hr |
| Jul 7, 5:07 PM MDT | Flash Flood Warning | GJT | Garfield, Mesa | 3 hr |
| Jul 7, 5:50 PM MDT | Flash Flood Warning | GJT | Moffat, Routt | 3 hr |
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.