Alert archive / Colorado / Flash Flood Warnings in 1997

Flash Flood Warning 29, NWS Denver/Boulder, CO

July 30, 1997Larimer County, Colorado

NWS Denver/Boulder, CO issued this flash flood warning at Jul 30, 1997, 2:25 PM MDT for Larimer County, Colorado. It was in force for 110 min. 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 30, 1997, 2:25 PM MDT (20:25 UTC)
Expired
Jul 30, 1997, 4:15 PM MDT
In force
110 min
Issued by
NWS Denver/Boulder, CO
Area
Whole counties; the outline is the Mesonet’s reconstruction

County Larimer County, CO

The radar

The Cheyenne radar (KCYS), 78 km from the middle of the area, began a volume at 20:27 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, 8.4 hours before the alert went out and 222 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 1997-07-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 158 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 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 12:00Z on 1997-07-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -7 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
158 J/kg
Mixed-layer CIN
-94 J/kg
Mixed-layer LCL
1017 m above ground
0-6 km bulk shear
7 kt
0-1 km storm-relative helicity
-7 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 
TTAA00 KDEN 302025
FFWDEN
COC069-302225-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE DENVER CO
225 PM MDT WED JUL 30 1997

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A FLASH FLOOD
WARNING EFFECTIVE UNTIL 415 PM MDT FOR PEOPLE IN THE FOLLOWING
COUNTIES

IN NORTH CENTRAL COLORADO
     CENTRAL LARIMER

INCLUDING THE FOLLOWING LOCATIONS
     GLEN HAVEN...PINGREE PARK...RED FEATHER LAKES AND RUSTIC

THIS DOES NOT INCLUDE THE CITY OF FORT COLLINS.

AT 220 PM MDT WEATHER SERVICE DOPPLER RADAR INDICATED VERY HEAVY RAIN
WEST OF RED FEATHERS LAKE.

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

PEOPLE ALONG ELKHORN AND LONE PINE CREEKS SHOULD BE PREPARED TO 
EVACUATE AND MOVE TO A PLACE OF SAFETY.

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. 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.

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 4098 10543 4044 10541 4043 10580 4098 10582

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 29, 6:24 PM MDTFlash Flood WarningBOUElbert96 min
Jul 29, 7:03 PM MDTFlash Flood WarningBOULogan, Weld72 min
Jul 29, 7:59 PM MDTFlash Flood WarningBOUElbert, Lincoln2 hr
Jul 29, 8:00 PM MDTFlash Flood WarningBOULogan, Weld90 min
Jul 29, 8:15 PM MDTFlash Flood WarningBOULarimer3 hr
Jul 29, 8:20 PM MDTFlash Flood WarningBOUMorgan55 min
Jul 29, 9:20 PM MDTFlash Flood WarningBOUMorgan40 min
Jul 29, 9:40 PM MDTFlash Flood WarningBOULogan, Weld80 min
Jul 29, 9:55 PM MDTFlash Flood WarningBOUElbert, Lincoln2 hr
Jul 29, 10:10 PM MDTFlash Flood WarningBOUMorgan50 min
Jul 29, 10:50 PM MDTFlash Flood WarningBOULogan, Morgan, Washington, Weld2 hr
Jul 29, 11:26 PM MDTFlash Flood WarningBOUElbert, Lincoln2 hr
Jul 30, 3:25 PM MDTFlash Flood WarningBOUBoulder, Clear Creek, Gilpin, Jefferson2 hr
Jul 30, 4:05 PM MDTFlash Flood WarningBOUBoulder, Jefferson115 min
Jul 30, 4:05 PM MDTSevere Thunderstorm WarningBOUBoulder, Jefferson115 min
Jul 30, 4:30 PM MDTFlash Flood WarningBOULogan14 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; radar from the NEXRAD Level II archive.