Alert archive / Colorado / Flash Flood Warnings in 2003

Flash Flood Warning 9, NWS Denver/Boulder, CO

June 18, 2003Larimer County, Colorado

NWS Denver/Boulder, CO issued this flash flood warning at Jun 18, 2003, 8:20 PM MDT for Larimer 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
Jun 18, 2003, 8:20 PM MDT (02:20 UTC)
Expired
Jun 18, 2003, 10:45 PM MDT
In force
2 hr
Issued by
NWS Denver/Boulder, CO
Area
Counties, with a storm outline in the text

County Larimer County, CO

The radar

The Denver radar (KFTG), 83 km from the middle of the area, began a volume at 02:24 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 00:00Z, 2.3 hours before the alert went out and 171 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 00:00Z on 2003-06-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 534 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Denver, CO at 00:00Z on 2003-06-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 5 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
534 J/kg
Mixed-layer CIN
-3 J/kg
Mixed-layer LCL
1264 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
5 m²/s²
0-3 km storm-relative helicity
58 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 190225
FFWBOU
COC069-190445-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE DENVER CO
820 PM MDT WED JUN 18 2003

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

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

* UNTIL 1045 PM MDT

* AT 820 PM MDT...THE PUBLIC REPORTED VERY HEAVY RAIN 2 MILES 
SOUTHWEST OF LOVELAND...UP TO A HALF OF AN INCH OF RAIN IN 20 
MINUTES.  THE STORM WAS MOVING VERY LITTLE DURING THE PAST HOUR. 
DOPPLER RADAR INDICATED IN EXCESS OF 2 INCHES OF RAIN HAD FALLEN 
DURING THE PAST HOUR IN THE CAMPION AREA.  

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

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. 

EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY
ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS AND STREAMS AND OTHER
LOW LYING AREAS ARE SUBJECT TO FLASH FLOODING.

LAT...LON 4048 10520 4043 10526 4030 10507 4032 10506
          4035 10506 4036 10504

$$

ENTREKIN
2 follow-up statements
000 
WGUS75 KBOU 190445
FFSBOU
COC069-190450-

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
943 PM MDT WED JUN 18 2003

THE FLASH FLOOD WARNING HAS EXPIRED FOR

  SOUTHEASTERN LARIMER COUNTY

AT 1040 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
LIGHT TO MODERATE RAIN CONTINUING ACROSS THE WARNING AREA. RAINFALL 
RATES ARE GENERALLY UNDER A HALF OF AN INCH IN ONE HOUR...AND ARE 
NOT EXPECTED TO CAUSE ANY MAJOR PROBLEMS.  MINOR STREET AND CREEK 
FLOODING MAY STILL BE ENCOUNTERED THROUGH 1 AM.  

LARIMER COUNTY OFFICIALS INDICATED NO ADDITIONAL FLOODING PROBLEMS. 
THE FLOOD WATERS AT COUNTY ROAD 16...JUST WEST OF HIGHWAY 287 HAS 
ALSO RECEDED...WHICH HAD BEEN UP TO 18 INCHES DEEP.    

LAT...LON 4048 10520 4043 10526 4030 10507 4032 10506 4035 10506 
4036 10504

$$

SWE
000 
WGUS75 KBOU 190401
FFSBOU
COC069-190445-

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
955 PM MDT WED JUN 18 2003

A FLASH FLOOD WARNING REMAINS IN EFFECT FOR

  SOUTHEASTERN LARIMER COUNTY

UNTIL 1045 PM MDT.

AT 955 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
MODERATE RAIN REDEVELOPING OVER THE WARNING AREA. STORMS WERE MOVING 
VERY SLOWLY TO THE NORTH AT 5 MPH. 

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

LARIMER COUNTY OFFICIALS INDICATED FLOODING AT COUNTY ROAD 16...JUST 
WEST OF HIGHWAY 287. MINOR STREET FLOODING WAS ALSO REPORTED IN THE 
LOVELAND AREA. 

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.

LAT...LON 4048 10520 4043 10526 4030 10507 4032 10506 4035 10506 
4036 10504

$$

SWE

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 18, 7:57 PM MDTFlash Flood WarningBOUAdams3 hr
Jun 19, 2:56 PM MDTFlash Flood WarningBOUDouglas2 hr

Nearby

Flash Flood Warnings in Colorado, 2003Every 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.