Alert archive / Colorado / Flash Flood Warnings in 2001

Flash Flood Warning 8, NWS Denver/Boulder, CO

July 9, 2001Morgan County, Colorado

NWS Denver/Boulder, CO issued this flash flood warning at Jul 9, 2001, 9:39 PM MDT for Morgan 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, 9:39 PM MDT (03:39 UTC)
Expired: Jul 9, 2001, 11:45 PM MDT
In force: 2 hr
Issued by: NWS Denver/Boulder, CO
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Morgan County, CO

The nearest sounding before it

Denver, CO (KDNR), launched 00:00Z, 3.7 hours before the alert went out and 60 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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 100341
FFWBOU
COC087-100545-

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

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

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

* UNTIL 1145 PM MDT

* AT 939 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  VERY HEAVY RAIN OVER UNION...OR ABOUT 16 MILES EAST OF FORT MORGAN.
  THE STORM PRODUCING THE HEAVY RAIN WAS MOVING NORTHEAST AT 20 MPH.

LOCATIONS IN THE WARNING INCLUDE...BUT ARE NOT LIMITED TO...UNION.
RADAR HAS ESTIMATED RAINFALL IN EXCESS OF 6 INCHES OF RAIN AROUND
UNION AND NORTH OF HILLROSE. MODERATE TO HEAVY RAIN IS STILL
OCCURING IN THE WARNING 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.

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 4037 10357 4030 10350 4034 10347 4042 10347

SWE
Q

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 9, 6:27 PM MDT	Flash Flood Warning	BOU	Arapahoe	2 hr
Jul 9, 6:36 PM MDT	Severe Thunderstorm Warning	BOU	Morgan	39 min
Jul 9, 8:00 PM MDT	Severe Thunderstorm Warning	BOU	Morgan	45 min
Jul 9, 8:17 PM MDT	Tornado Warning	BOU	Morgan	43 min
Jul 9, 8:39 PM MDT	Severe Thunderstorm Warning	BOU	Weld	51 min
Jul 9, 8:46 PM MDT	Tornado Warning	BOU	Morgan, Washington	29 min
Jul 10, 4:03 AM MDT	Severe Thunderstorm Warning	BOU	Phillips	27 min
Jul 10, 4:46 PM MDT	Severe Thunderstorm Warning	BOU	Clear Creek	29 min
Jul 10, 5:46 PM MDT	Flash Flood Warning	BOU	Clear Creek	119 min

Nearby

Flash Flood Warnings in Colorado, 2001 Every 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.