Alert archive / Colorado / Flash Flood Warnings in 2003

Flash Flood Warning 20, NWS Denver/Boulder, CO

August 7, 2003Douglas County, Colorado

NWS Denver/Boulder, CO issued this flash flood warning at Aug 7, 2003, 2:34 PM MDT for Douglas 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 7, 2003, 2:34 PM MDT (20:34 UTC)
Expired: Aug 7, 2003, 5:30 PM MDT
In force: 3 hr
Issued by: NWS Denver/Boulder, CO
Area: Counties, with a storm outline in the text

County Douglas County, CO

The radar

The Denver radar (KFTG), 87 km from the middle of the area, began a volume at 20:33 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

Denver, CO (KDNR), launched 12:00Z, 8.6 hours before the alert went out and 186 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: 73 J/kg
Mixed-layer CIN: -437 J/kg
Mixed-layer LCL: 2298 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 8 m²/s²
0-3 km storm-relative helicity: 0 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 KBOU 072037
FFWBOU
COC035-072330-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE DENVER CO
234 PM MDT THU AUG 7 2003

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHWESTERN DOUGLAS COUNTY IN NORTHEAST COLORADO

* UNTIL 530 PM MDT

* AT 234 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  VERY HEAVY RAIN OVER WESTCREEK...OR ABOUT 25 MILES SOUTHWEST OF
  CASTLE ROCK. THE STORM PRODUCING THE HEAVY RAIN WAS MOVING EAST AT
  5 MPH.

LOCATIONS IN THE WARNING INCLUDE...BUT ARE NOT LIMITED TO...
WESTCREEK.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE. IF YOUR VEHICLE STALLS ABANDON IT IMMEDIATELY AND SEEK
HIGHER GROUND.

DOPPLER RADAR ESTIMATES THAT UP TO 0.40 OF AN INCH RAIN HAS FALLEN 
OVER THE HAYMAN BURN AREA IN DOUGLAS COUNTY SINCE 2:10 PM.

HEAVY RAINFALL WILL CAUSE FLASH FLOODING OF SMALL CREEKS...STREAMS...
AND DITCHES IN THE HAYMAN FIRE BURN AREA. SOME DRAINAGE BASINS 
AFFECTED BY EXCESSIVE RUNOFF INCLUDE FOURMILE CREEK...TRAIL CREEK 
...TURKEY CREEK...WEST CREEK...AND OTHER TRIBUTARIES OF THE SOUTH 
PLATTE RIVER. MUD AND ASH FLOWS CAN ALSO BE EXPECTED ACROSS RURAL 
ROADS.

LAT...LON 3914 10532 3914 10509 3922 10512 3927 10514
          3927 10520 3924 10524 3922 10525 3919 10528

$$
RJK

3 follow-up statements

000 
WGUS75 KBOU 072114
FFSBOU
COC035-072330-

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
315 PM MDT THU AUG 7 2003

A FLASH FLOOD WARNING REMAINS IN EFFECT FOR

  SOUTHWESTERN DOUGLAS COUNTY

UNTIL 530 PM MDT.

AT 315 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
THUNDERSTORMS OVER THE HAYMAN BURN AREA OF DOUGLAS COUNTY.  THE 
STORMS CONTINUED PRODUCING MODERATE RAINFALL OVER WESTCREEK...OR 
ABOUT 21 MILES SOUTHWEST OF CASTLE ROCK. THE STORM PRODUCING THE 
HEAVY RAIN WAS MOVING EAST AT 10 MPH.

LOCATIONS REMAINING IN THE WARNING INCLUDE...BUT ARE NOT LIMITED
TO...WESTCREEK.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE. IF YOUR VEHICLE STALLS ABANDON IT IMMEDIATELY AND SEEK
HIGHER GROUND.

DOPPLER RADAR ESTIMATES THAT UP TO THREE QUARTERS OF AN INCH OF RAIN 
HAS FALLEN OVER THE WARNING AREA IN DOUGLAS COUNTY SINCE 2:10 PM MDT.
A RAIN GAUGE ON FOUR MILE CREEK 6 MILES SOUTH OF DECKERS REPORTED 
0.67 OF AN INCH OF RAIN HAS FALLEN SINCE 2 PM.

HEAVY RAINFALL WILL CAUSE FLASH FLOODING OF SMALL CREEKS...STREAMS...
AND DITCHES IN THE HAYMAN FIRE BURN AREA. SOME DRAINAGE BASINS
AFFECTED BY EXCESSIVE RUNOFF INCLUDE FOURMILE CREEK...GOOSE CREEK...
SIXMILE CREEK...TRAIL CREEK...TURKEY CREEK...WEST CREEK...AND OTHER
TRIBUTARIES OF THE SOUTH PLATTE RIVER. MUD AND ASH FLOWS CAN ALSO BE
EXPECTED ACROSS RURAL ROADS.

LAT...LON 3914 10532 3914 10509 3922 10512 3927 10514
          3927 10520 3924 10524 3922 10525 3919 10528

$$
RJK

000 
WGUS75 KBOU 072223
FFSBOU
COC035-072330-

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
420 PM MDT THU AUG 7 2003

A FLASH FLOOD WARNING REMAINS IN EFFECT FOR

  SOUTHWESTERN DOUGLAS COUNTY

UNTIL 530 PM MDT.

AT 415 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
RAIN HAD DIMINISHED OVER THE HAYMAN BURN AREA OF DOUGLAS COUNTY.  
DOPPLER RADAR ESTIMATES AND RAIN GAGES INDICATE THAT 0.5 TO 1.0
INCH OF RAIN HAS FALLEN IN AN AREA FROM 8 MILES SOUTH OF DECKERS 
EASTWARD TO 5 MILES NORTH OF WESTCREEK.  CREEKS AFFECTED BY THE
HEAVY RAINS INCLUDE FOUR MILE...CAMP CREEK...WEST CREEK AND 
TROUT CREEK.

LOCATIONS REMAINING IN THE WARNING INCLUDE...BUT ARE NOT LIMITED
TO...WESTCREEK.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE. IF YOUR VEHICLE STALLS ABANDON IT IMMEDIATELY AND SEEK
HIGHER GROUND.

EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING OF CREEKS
AND STREAMS...ROADS AND ROADSIDE CULVERTS.  THE RUNOFF COULD ALSO
TRIGGER ROCK AND MUDSLIDES IN STEEP TERRAIN.

LAT...LON 3914 10532 3914 10509 3922 10512 3927 10514           
          3927 10520 3924 10524 3922 10525 3919 10528

$$
TLH

000 
WGUS75 KBOU 072323
FFSBOU
COC035-072330-

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
523 PM MDT THU AUG 7 2003

THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR

  SOUTHWESTERN DOUGLAS COUNTY

UNTIL 530 PM MDT HAS BEEN ALLOWED TO EXPIRE.

AT 520 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
ONLY SOME LINGERING LIGHT RAIN OVER THE HAYMAN BURN AREA IN 
SOUTHWEST DOUGLAS COUNTY. DOPPLER RADAR ESTIMATES AND RAIN GAGES 
INDICATE THAT 0.5 TO 1.0 INCH OF RAIN FELL IN AN AREA FROM 8 MILES 
SOUTH OF DECKERS EASTWARD TO 5 MILES NORTH OF WESTCREEK EARLIER THIS
AFTERNOON. NO REPORTS OF FLOODING HAVE BEEN RECEIVED SO THE WARNING 
HAS BEEN ALLOWED TO EXPIRE. 

LAT...LON 3914 10532 3914 10509 3922 10512 3927 10514           
          3927 10520 3924 10524 3922 10525 3919 10528

$$
TLH

The office that day

Everything else NWS Denver/Boulder, CO issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 7, 2:58 PM MDT	Severe Thunderstorm Warning	BOU	Weld	62 min

Nearby

Flash Flood Warnings in Colorado, 2003 Every flash flood warning in 2003

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.