Alert archive / Colorado / Flash Flood Warnings in 1997

Flash Flood Warning 39, NWS Denver/Boulder, CO

July 31, 1997Logan County, Morgan County, Weld County, Colorado

NWS Denver/Boulder, CO issued this flash flood warning at Jul 31, 1997, 6:15 PM MDT for Logan County, Morgan County, Weld 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 the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.

The facts

Issued
Jul 31, 1997, 6:15 PM MDT (00:15 UTC)
Expired
Jul 31, 1997, 9:00 PM MDT
In force
3 hr
Issued by
NWS Denver/Boulder, CO
Area
Whole counties; the outline is the Mesonet’s reconstruction

Counties Logan County, CO, Morgan County, CO, Weld County, CO

The nearest sounding before it

Denver, CO (KDNR), launched 00:00Z, 0.3 hours before the alert went out and 92 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 1997-08-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 335 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Denver, CO at 00:00Z on 1997-08-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -4 square meters per square second.193958Sfc1 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
335 J/kg
Mixed-layer CIN
-27 J/kg
Mixed-layer LCL
854 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
-4 m²/s²
0-3 km storm-relative helicity
20 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 
TTAA00 KDEN 010019
FFWDEN
COC075-087-123-010200-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE DENVER CO
615 PM MDT THU JUL 31 1997

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A FLASH FLOOD 
WARNING EFFECTIVE UNTIL 900 PM MDT FOR PEOPLE IN THE FOLLOWING 
COUNTIES

IN NORTHEAST COLORADO
     EAST CENTRAL WELD...NORTHEASTERN MORGAN AND WESTERN LOGAN

INCLUDING THE FOLLOWING LOCATIONS
     STERLING...ANTELOPE SPRINGS...ILIFF...LOGAN CORNERS...NORTH
     STERLING RESERVOIR...PADRONI...PAWNEE PASS...STONEHAM AND
     WILLARD

AT 610 PM MDT WEATHER SERVICE DOPPLER RADAR INDICATED VERY HEAVY RAIN
OVER NORTHERN MORGAN...SOUTHEAST WELD AND WESTERN LOGAN COUNTIES.
ANOTHER AREA OF HEAVY RAIN WAS MOVING ACROSS WESTERN MORGAN COUNTY.

DOPPLER RADAR ESTIMATES INDICATED UP TO 1 INCH HAD FALLEN OVER 
NORTHERN MORGAN COUNTY...AND 1 TO 1 1/2 INCHES HAD FALLEN OVER 
WESTERN LOGAN COUNTY. 

EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING OF SMALL 
CREEKS AND STREAMS SUCH AS WILDHORSE CREEK IN WELD COUNTY...WILDCAT 
CREEK IN MORGAN COUNTY AND SPRING CREEK AND STERLING CANAL IN LOGAN 
COUNTY.  FLASH FLOODING WILL ALSO OCCUR OVER COUNTY ROADS AND OVER
WASHES AND ARROYOS...AS WELL AS FARMLAND ALONG THE BANKS OF CREEKS 
AND STREAMS.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. VEHICLES CAUGHT IN RISING WATER SHOULD BE ABANDONED QUICKLY.
MOVE TO HIGHER GROUND.

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. 

TO REPORT SEVERE WEATHER HAVE THE NEAREST LAW ENFORCEMENT AGENCY
RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN
DENVER.

LESZCYNSKI

LAT...LON 4094 10322 4074 10297 4030 10372 4049 10391

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 31, 6:15 PM MDTFlash Flood WarningBOUElbert3 hr

Nearby

Flash Flood Warnings in Colorado, 1997Every flash flood warning in 1997

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.