Alert archive / Colorado / Flash Flood Warnings in 2001
Flash Flood Warning 18, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this flash flood warning at Aug 13, 2001, 3:30 PM MDT for Washington County, Colorado. It was in force for 90 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
- Aug 13, 2001, 3:30 PM MDT (21:30 UTC)
- Expired
- Aug 13, 2001, 5:00 PM MDT
- In force
- 90 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Washington County, CO
The radar
The Denver radar (KFTG), 124 km from the middle of the area, began a volume at 21:33 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
N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 9.5 hours before the alert went out and 242 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.
- Mixed-layer CAPE
- 45 J/kg
- Mixed-layer CIN
- -225 J/kg
- Mixed-layer LCL
- 1135 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 76 m²/s²
- 0-3 km storm-relative helicity
- 179 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.5
The text
As transmitted, in the capitals the NWS used until 2016.
000 WGUS55 KBOU 132136 CCA FFWDEN COC121-132300- BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE DENVER CO 330 PM MDT MON AUG 13 2001 ...CORRECTED MOVEMENT OF STORM... THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A * FLASH FLOOD WARNING FOR... NORTH CENTRAL WASHINGTON COUNTY IN NORTHEAST COLORADO * UNTIL 500 PM MDT * AT 330 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED VERY HEAVY RAIN 6 MILES NORTHEAST OF FREMONT BUTTE...OR ABOUT 12 MILES NORTH OF AKRON. THE STORM PRODUCING THE HEAVY RAIN WAS NEARLY STATIONARY. RADAR INDICATES UP TO 4 INCHES OF RAIN HAS FALLEN IN THE PAST HOUR SOUTHEAST OF MESSEX. LOCATIONS IN THE WARNING INCLUDE...BUT ARE NOT LIMITED TO...FREMONT BUTTE AND MESSEX. 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 4041 10339 4022 10340 4023 10310 4042 10311 KLEYLA
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 13, 1:59 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Arapahoe, Denver | 46 min |
| Aug 13, 2:17 PM MDT | Tornado Warning | BOU | Adams, Denver | 28 min |
| Aug 13, 2:30 PM MDT | Severe Thunderstorm Warning | BOU | Douglas, Jefferson | 45 min |
| Aug 13, 2:46 PM MDT | Severe Thunderstorm Warning | BOU | Washington | 29 min |
| Aug 13, 4:02 PM MDT | Flash Flood Warning | BOU | Washington | 88 min |
| Aug 13, 4:55 PM MDT | Flash Flood Warning | BOU | Washington | 95 min |
| Aug 13, 5:15 PM MDT | Flash Flood Warning | BOU | Washington | 105 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; radar from the NEXRAD Level II archive.