Alert archive / Colorado / Flash Flood Warnings in 2002
Flash Flood Warning 21, NWS Grand Junction, CO
NWS Grand Junction, CO issued this flash flood warning at Aug 3, 2002, 1:37 PM MDT for La Plata 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
- Aug 3, 2002, 1:37 PM MDT (19:37 UTC)
- Expired
- Aug 3, 2002, 4:30 PM MDT
- In force
- 3 hr
- Issued by
- NWS Grand Junction, CO
- Area
- Counties, with a storm outline in the text
County La Plata County, CO
The radar
The Grand Junction radar (KGJX), 185 km from the middle of the area, began a volume at 19:40 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, 7.6 hours before the alert went out and 199 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
- 371 J/kg
- Mixed-layer CIN
- -25 J/kg
- Mixed-layer LCL
- 971 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 13 m²/s²
- 0-3 km storm-relative helicity
- 32 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.5
The text
As transmitted, in the capitals the NWS used until 2016.
779
WGUS55 KGJT 031937
FFWGJT
COC067-032230-
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
135 PM MDT SAT AUG 3 2002
THE NATIONAL WEATHER SERVICE IN GRAND JUNCTION HAS ISSUED A
* FLASH FLOOD WARNING FOR...
NORTHEAST LA PLATA COUNTY IN SOUTHWEST COLORADO
* UNTIL 430 PM MDT
* AT 135 PM MDT...STRONG THUNDERSTORMS WITH HEAVY RAIN CONTINUE TO
DEVELOP AROUND THE MISSIONARY RIDGE BURN AREA.
* THE THUNDERSTORMS WITH EXCESSIVE RAINFALL WILL BE OVER...
LEMON RESERVOIR BY 200 PM MDT
VALLECITO RESERVOIR BY 230 PM MDT
THE THUNDERSTORMS ARE MOVING SOUTHWEST TO NORTHEAST AT 20 MPH.
EXCESSIVE RUNOFF FROM THE HEAVY RAIN WILL CAUSE FLASH FLOODING OF
CREEKS AND STREAMS...ROADS AND ROADSIDE CULVERTS. THE HEAVY RAINS
COULD ALSO TRIGGER ROCK AND MUDSLIDES IN STEEP TERRAIN.
HEAVY RAIN OVER THE MISSIONARY RIDGE BURN AREA WILL CAUSE DEBRIS AND
MUD FLOWS. LA PLATA COUNTY SHERIFF REPORTED 5 FOOT DEEP MUDSLIDES
EARLIER THIS AFTERNOON ALONG JACK CREEK AND COUNTY ROAD 501.
RESIDENTS AND MOTORISTS AROUND THIS AREA SHOULD BE PREPARED FOR
ADDITIONAL FLOODING THROUGHOUT THE AFTERNOON.
A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
LAT...LON 3738 10783 3734 10767 3732 10748 3762 10749
3763 10779 3748 10780
DJN
$$1 follow-up statement
811 RWUS32 KGJT 032203 FFSGJT COC067-032230- FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE GRAND JUNCTION CO 400 PM MDT SAT AUG 3 2002 ...THE FLASH FLOOD WARNING WHICH WAS IN EFFECT UNTIL 430 PM MDT FOR NORTHEASTERN LA PLATA COUNTY HAS BEEN CANCELED... THE HEAVY RAIN HAS ENDED OVER THE WARNED AREA. STORMS HAVE MOVED OFF TO THE NORTHEAST. AT 330 PM MDT...LOCAL LAW ENFORCEMENT REPORTED THE WEST SIDE OF VALLECITO RESERVOIR WAS DEVASTATED WITH DEBRIS FLOWS ACROSS FOREST ROAD 501 AND INTO SEVERAL HOMES AND BUSINESSES. ANY FURTHER MEASURABLE RAINFALL THIS EVENING COULD CAUSE FURTHER DEBRIS FLOWS. MOST THUNDERSTORM ACTIVITY IS EXPECTED TO END AFTER SUNSET. STAY TUNED TO YOUR FAVORITE MEDIA OUTLET ON THIS SITUATION. YOU CAN ALSO GET THE LATEST WARNINGS...FORECASTS...AND STATEMENTS BY VISITING THE HOME PAGE OF THE NATIONAL WEATHER SERVICE IN GRAND JUNCTION AT WWW.CRH.NOAA.GOV/GJT/
Nearby
Flash Flood Warnings in Colorado, 2002Every flash flood warning in 2002
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.