Alert archive / Colorado / Flash Flood Warnings in 2004

Flash Flood Warning 33, NWS Denver/Boulder, CO

August 18, 2004Larimer County, Colorado

NWS Denver/Boulder, CO issued this flash flood warning at Aug 18, 2004, 1:02 PM MDT for Larimer 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 18, 2004, 1:02 PM MDT (19:02 UTC)
Expired
Aug 18, 2004, 4:00 PM MDT
In force
3 hr
Issued by
NWS Denver/Boulder, CO
Area
Counties, with a storm outline in the text

County Larimer County, CO

The radar

The Cheyenne radar (KCYS), 88 km from the middle of the area, began a volume at 19:06 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, 7.0 hours before the alert went out and 203 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-pSkew-T log-p diagram, Denver, CO at 12:00Z on 2004-08-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Denver, CO at 12:00Z on 2004-08-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -23 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2142 m above ground
0-6 km bulk shear
19 kt
0-1 km storm-relative helicity
-23 m²/s²
0-3 km storm-relative helicity
18 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 181905
FFWBOU
COC069-182200-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE DENVER CO
102 PM MDT WED AUG 18 2004

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CENTRAL LARIMER COUNTY IN NORTH CENTRAL COLORADO

* UNTIL 400 PM MDT

* AT 102 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  VERY HEAVY RAIN 6 MILES NORTHWEST OF GLEN HAVEN...OR ABOUT 21 MILES
  WEST OF FORT COLLINS.  THE STORM PRODUCING THE HEAVY RAIN WAS
  NEARLY STATIONARY.

LOCATIONS IN THE WARNING INCLUDE...BUT ARE NOT LIMITED TO...GLEN
HAVEN.

DOPPLER RADAR ESTIMATED 2 INCHES OF RAIN HAD FALLEN IN THE WARNING 
AREA IN JUST UNDER AN HOUR. BUCKHORN CREEK AND BOX PRARIE CREEK WILL 
BE AFFECTED BY THE FLOODING.

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 SMALL
CREEKS AND STREAMS...COUNTRY ROADS...NORMALLY DRY WASHES AND
ARROYOS...AS WELL AS FARMLAND ALONG THE BANKS OF CREEKS AND STREAMS.

LAT...LON 4061 10552 4045 10561 4043 10537 4057 10524

$$

ENTREKIN
1 follow-up statement
000 
WGUS75 KBOU 182055
FFSBOU
COC069-182200-

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
254 PM MDT WED AUG 18 2004

A FLASH FLOOD WARNING REMAINS IN EFFECT FOR

  CENTRAL LARIMER COUNTY

UNTIL 400 PM MDT.

AT 236 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
HEAVY RAIN CONTINUES 3 MILES NORTH OF GLEN HAVEN. THE SHOWERS OVER 
THE WARNING AREA HAVE MOVED VERY LITTLE IN THE PAST SEVERAL HOURS. 

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

DOPPLER RADAR ESTIMATED IN UPWARDS OF 3 INCHES OF RAIN HAD FALLEN 
ABOUT 5 MILES NORTHWEST OF GLEN HAVEN.  COUNTY OFFICIALS REPORTED 
HAVE REPORTED ROADS FLOODED ALONG MILLER FORK AND DUNRAVEN 
GLADE...JUST NORTH OF GLEN HAVEN. BUCKHORN CREEK...CASCADE CREEK AND 
NORTH FORK CREEK WILL ALSO BE SUSCEPTIBLE TO FLASH FLOODING.  

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 SMALL
CREEKS AND STREAMS...COUNTRY ROADS...NORMALLY DRY WASHES AND
ARROYOS...AS WELL AS FARMLAND ALONG THE BANKS OF CREEKS AND STREAMS.

LAT...LON 4061 10552 4045 10561 4043 10537 4057 10524

$$

ENTREKIN

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 18, 1:42 PM MDTFlash Flood WarningBOUDouglas3 hr
Aug 18, 3:08 PM MDTFlash Flood WarningBOUBoulder3 hr
Aug 18, 3:32 PM MDTFlash Flood WarningBOUJefferson4 hr
Aug 18, 4:01 PM MDTFlash Flood WarningBOULarimer3 hr
Aug 18, 4:12 PM MDTFlash Flood WarningBOUDenver3 hr
Aug 18, 4:30 PM MDTSevere Thunderstorm WarningBOULincoln45 min
Aug 18, 4:57 PM MDTFlash Flood WarningBOUArapahoe, Douglas3 hr
Aug 18, 5:15 PM MDTSevere Thunderstorm WarningBOUElbert, Lincoln45 min
Aug 18, 5:33 PM MDTFlash Flood WarningBOUDouglas3 hr

Nearby

Flash Flood Warnings in Colorado, 2004Every flash flood warning in 2004

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.