Alert archive / Colorado / Flash Flood Warnings in 2002

Flash Flood Warning 13, NWS Grand Junction, CO

July 23, 2002La Plata County, Colorado

NWS Grand Junction, CO issued this flash flood warning at Jul 23, 2002, 10:36 PM MDT for La Plata County, Colorado. It was in force for 114 min. 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 23, 2002, 10:36 PM MDT (04:36 UTC)
Expired: Jul 24, 2002, 12:30 AM MDT
In force: 114 min
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), 187 km from the middle of the area, began a volume at 04:37 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 00:00Z, 4.6 hours before the alert went out and 201 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 325 J/kg
Mixed-layer CIN: -13 J/kg
Mixed-layer LCL: 3474 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: -3 m²/s²
0-3 km storm-relative helicity: 14 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WGUS55 KGJT 240436
FFWGJT
COC067-240630-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
1035 PM MDT TUE JUL 23 2002

THE NATIONAL WEATHER SERVICE IN GRAND JUNCTION HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CENTRAL LA PLATA COUNTY IN SOUTHWEST COLORADO

* UNTIL 1230 AM MDT

* AT 1035 PM MDT...WEATHER SERVICE DOPPLER RADAR INDICATED HEAVY RAIN
  HAD SPREAD TO THE WEST SIDE OF THE ANIMAS VALLEY...THUS REQUIRING
  THE EXTENSION OF THE FLASH FLOOD WARNING TO THAT AREA.

* SHOWERS AND THUNDERSTORM WITH HEAVY RAIN WILL CONTINUE TO MOVE
  SOUTH AT ABOUT 15 MPH ACROSS THE MISSIONARY RIDGE BURN AREA...AS
  WELL AS THE OTHER BURNED AREAS WEST OF THE ANIMAS VALLEY.

* OTHER LOCATIONS IN THE WARNING INCLUDE HERMOSA...LEMON AND 
  VALLECITO RESERVOIRS

LAW ENFORCEMENT AND WEATHER SPOTTERS CONTINUE TO REPORT AREAS OF 
EXCESSIVE RUNOFF OF MUD...DEBRIS...AND FLOOD WATERS IN THE 
MISSIONARY RIDGE BURN AREA.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODS AND FLASH FLOODS. IF FLASH FLOODING IS OBSERVED ACT
QUICKLY. MOVE IMMEDIATELY UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS 
AND MUD SLIDES. DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER 
COVERS THE ROADWAY.

TO REPORT FLOODING...PLEASE NOTIFY THE NATIONAL WEATHER SERVICE OR 
REQUEST THE NEAREST LAW ENFORCEMENT AGENCY TO RELAY YOUR REPORT TO 
THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN GRAND JUNCTION.

LAT...LON 3751 10793 3729 10791 3726 10753 3751 10751

1 follow-up statement

019 
RWUS32 KGJT 240530
FFSGJT
COC067-240630-

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
1129 PM MDT TUE JUL 23 2002

...FLASH FLOOD WARNING FOR CENTRAL LA PLATA COUNTY REMAINS IN EFFECT
UNTIL 1230 AM MDT...

DOPPLER RADAR CONTINUES TO SHOW MODERATE TO LOCALLY HEAVY RAINFALL
OVER PORTIONS OF THE WARNING AREA.  ADDITIONAL MODERATE TO HEAVY
SHOWERS AND THUNDERSTORMS ARE POISED TO TRACK SOUTH ACROSS THE
WARNING AREA THROUGH 1230 AM MDT. MOVEMENT OF THE STORM CELLS HAS
CONTINUED AT ABOUT 15 MPH.

LAW ENFORCEMENT REPORTED RUNOFF AND FLOODING PROBLEMS CONTINUING IN
SOME LOCATIONS WITHIN THE MISSIONARY RIDGE BURN AREA.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODS AND FLASH FLOODS. IF FLASH FLOODING IS OBSERVED ACT
QUICKLY. MOVE IMMEDIATELY TO HIGHER GROUND TO ESCAPE FLOOD WATERS
AND MUD SLIDES. DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER
COVERS THE ROADWAY.

TO REPORT FLOODING...PLEASE NOTIFY THE NATIONAL WEATHER SERVICE OR
REQUEST THE NEAREST LAW ENFORCEMENT AGENCY TO RELAY YOUR REPORT TO
THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN GRAND JUNCTION.

JRP

The office that day

Everything else NWS Grand Junction, CO issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 23, 9:45 PM MDT	Flash Flood Warning	GJT	La Plata	105 min
Jul 24, 12:28 AM MDT	Flash Flood Warning	GJT	La Plata	77 min
Jul 24, 1:44 PM MDT	Flash Flood Warning	GJT	La Plata	3 hr

Nearby

Flash Flood Warnings in Colorado, 2002 Every 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.