Alert archive / Colorado / Flash Flood Warnings in 2005

Flash Flood Warning 13, NWS Denver/Boulder, CO

August 21, 2005Douglas County, Colorado

NWS Denver/Boulder, CO issued this flash flood warning at Aug 21, 2005, 4:13 PM MDT for Douglas County, Colorado. It was in force for 2 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 21, 2005, 4:13 PM MDT (22:13 UTC)
Expired: Aug 21, 2005, 6:15 PM MDT
In force: 2 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 22:16 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, 10.2 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: 85 J/kg
Mixed-layer CIN: -268 J/kg
Mixed-layer LCL: 1778 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: 18 m²/s²
0-3 km storm-relative helicity: 23 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 212217
FFWBOU
COC035-220015-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE DENVER CO
413 PM MDT SUN AUG 21 2005

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

* FLASH FLOOD WARNING FOR THE HAYMAN BURN AREA OF SOUTHWESTERN
   DOUGLAS COUNTY IN NORTHEAST COLORADO

* UNTIL 615 PM MDT

* AT 412 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  VERY HEAVY RAIN FROM A THUNDERSTORM 4 MILES NORTHWEST OF
  WESTCREEK...OR ABOUT 31 MILES NORTHWEST OF COLORADO SPRINGS. THIS
  STORM WAS MOVING EAST AT 10 MPH.

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

RAINFALL AMOUNTS OF UP TO 0.75 INCH HAVE FALLEN OVER SOUTHWESTERN 
DOUGLAS COUNTY IN THE LAST HOUR.  RADAR CONTINUES TO SHOW MORE 
MODERATE TO HEAVY RAINFALL EXPECTED OVER THE HAYMAN BURN AREA OF 
DOUGLAS COUNTY.

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. TURN AROUND...DO NOT DROWN.

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. ROCK SLIDES OR MUD FLOWS CAN
BE EXPECTED ACROSS RURAL ROADS.

LAT...LON 3925 10514 3926 10520 3924 10524 3921 10525
      3919 10526 3917 10530 3913 10532 3913 10510

$$
RJK

1 follow-up statement

000 
WGUS75 KBOU 212310
FFSBOU

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
506 PM MDT SUN AUG 21 2005

COC035-212316-
DOUGLAS CO-
506 PM MDT SUN AUG 21 2005

...THE FLASH FLOOD WARNING FOR THE HAYMAN BURN AREA IN SOUTHWESTERN 
DOUGLAS COUNTY IS CANCELLED...

THE STORM THAT PROMPTED THE WARNING HAS WEAKENED AND IS NO LONGER
EXPECTED TO PRODUCE FLASH FLOODING.

RAINFALL AMOUNTS OVER THE HAYMAN BURN AREA IN SOUTHWESTERN DOUGLAS 
COUNTY RANGED FROM 0.40 TO ABOUT 1.00 INCH OF RAIN.   THERE WERE NO 
REPORTS OF FLOODING.   

LAT...LON 3925 10514 3926 10520 3924 10524 3921 10525
      3919 10526 3917 10530 3913 10532 3913 10510

$$
RJK

Nearby

Flash Flood Warnings in Colorado, 2005 Every flash flood warning in 2005

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.