Alert archive / Colorado / Flash Flood Warnings in 2001

Flash Flood Warning 7, NWS Denver/Boulder, CO

July 9, 2001Arapahoe County, Colorado

NWS Denver/Boulder, CO issued this flash flood warning at Jul 9, 2001, 6:27 PM MDT for Arapahoe 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 the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.

The facts

Issued
Jul 9, 2001, 6:27 PM MDT (00:27 UTC)
Expired
Jul 9, 2001, 8:30 PM MDT
In force
2 hr
Issued by
NWS Denver/Boulder, CO
Area
Whole counties; the outline is the Mesonet’s reconstruction

County Arapahoe County, CO

The nearest sounding before it

Denver, CO (KDNR), launched 00:00Z, 0.5 hours before the alert went out and 52 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 2001-07-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 323 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 2001-07-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 56 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
323 J/kg
Mixed-layer CIN
-157 J/kg
Mixed-layer LCL
2587 m above ground
0-6 km bulk shear
13 kt
0-1 km storm-relative helicity
56 m²/s²
0-3 km storm-relative helicity
8 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 100030
FFWDEN

COC005-100230-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE DENVER CO
627 PM MDT MON JUL 9 2001

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EAST CENTRAL ARAPAHOE COUNTY IN NORTHEAST COLORADO

* UNTIL 830 PM MDT

* AT 627 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
VERY HEAVY RAIN CONTINUES OVER JOLLY RANCH...OR ABOUT 25 MILES NORTH 
OF LIMON. THE STORM PRODUCING THE HEAVY RAIN HAS MOVED VERY LITTLE 
IN THE PAST HOUR. 

LOCATIONS IN THE WARNING INCLUDE...BUT ARE NOT LIMITED TO...JOLLY
RANCH.

THIS FLASH FLOOD WARNING REPLACES THE EARLIER SMALL STREAM FLOOD 
ADVISORY. DOPPLER RADAR INDICATED IN EXCESS OF 4 INCHES MAY HAVE 
FALLEN IN THE JOLLY RANCH AREA. NO GROUND TRUTH HAS BEEN OBTAINED TO 
VERIFY RAINFALL.

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.

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.

LAT...LON 3967 10379 3960 10379 3959 10371 3967 10371

SWE

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 9, 6:36 PM MDTSevere Thunderstorm WarningBOUMorgan39 min
Jul 9, 8:00 PM MDTSevere Thunderstorm WarningBOUMorgan45 min
Jul 9, 8:17 PM MDTTornado WarningBOUMorgan43 min
Jul 9, 8:39 PM MDTSevere Thunderstorm WarningBOUWeld51 min
Jul 9, 8:46 PM MDTTornado WarningBOUMorgan, Washington29 min
Jul 9, 9:39 PM MDTFlash Flood WarningBOUMorgan2 hr
Jul 10, 4:03 AM MDTSevere Thunderstorm WarningBOUPhillips27 min
Jul 10, 4:46 PM MDTSevere Thunderstorm WarningBOUClear Creek29 min
Jul 10, 5:46 PM MDTFlash Flood WarningBOUClear Creek119 min

Nearby

Flash Flood Warnings in Colorado, 2001Every flash flood warning in 2001

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.