Alert archive / Colorado / Tornado Warnings in 2001

Tornado Warning 11, NWS Denver/Boulder, CO

June 4, 2001Morgan County, Colorado

NWS Denver/Boulder, CO issued this tornado warning at Jun 4, 2001, 4:10 PM MDT for Morgan County, Colorado. It was in force for 35 min. 2 reports came from 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, with what was reported inside it.

The facts

Issued
Jun 4, 2001, 4:10 PM MDT (22:10 UTC)
Expired
Jun 4, 2001, 4:45 PM MDT
In force
35 min
Issued by
NWS Denver/Boulder, CO
Area
Whole counties; the outline is the Mesonet’s reconstruction

County Morgan County, CO

The radar

The Denver radar (KFTG), 68 km from the middle of the area, began a volume at 22:09 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.

What was reported inside it

TimeReportWhereRemark
Jun 4, 4:40 PM MDTHail 0.75Bennett, CO
Jun 4, 4:40 PM MDTTornado F1Bennett, COA tornado touched down and snapped several trees. In addition, a grain bin was thrown 200 yards and the door was ripped off an aircraft hangar. Dime size hail piled up to a foot in depth.

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The nearest sounding before it

Denver, CO (KDNR), launched 12:00Z, 10.2 hours before the alert went out and 45 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 2001-06-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 454 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 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 2001-06-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 35 square meters per square second.19395878Sfc1 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
454 J/kg
Mixed-layer CIN
-39 J/kg
Mixed-layer LCL
650 m above ground
0-6 km bulk shear
51 kt
0-1 km storm-relative helicity
35 m²/s²
0-3 km storm-relative helicity
110 m²/s²
Significant tornado parameter
0.1
Supercell composite
0.8

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

929 
WFUS55 KBOU 042216 CCA
TORDEN
COC001-005-087-121-042245-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DENVER CO
410 PM MDT MON JUN 4 2001

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

* TORNADO WARNING FOR...
  EASTERN ADAMS COUNTY IN NORTHEAST COLORADO
  NORTHEASTERN ARAPAHOE COUNTY IN NORTHEAST COLORADO
  SOUTHEASTERN MORGAN COUNTY IN NORTHEAST COLORADO
  SOUTHWESTERN WASHINGTON COUNTY IN NORTHEAST COLORADO

* UNTIL 445 PM MDT

* AT 410 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  THUNDERSTORM WITH A POSSIBLE TORNADO 3 MILES SOUTH OF SHAMROCK...OR
  ABOUT 29 MILES SOUTH OF FORT MORGAN...MOVING EAST AT 30 MPH.

LOCATIONS IN THE WARNING INCLUDE...BUT ARE NOT LIMITED TO...ADENA...
JOLLY RANCH...LAST CHANCE...SHAMROCK...WOODLIN SCHOOL AND WOODROW.

THE SAFEST PLACE TO BE DURING A TORNADO IS IN A BASEMENT. GET UNDER A
WORKBENCH OR OTHER PIECE OF STURDY FURNITURE. IF NO BASEMENT IS
AVAILABLE...SEEK SHELTER ON THE LOWEST FLOOR OF THE BUILDING IN AN
INTERIOR HALLWAY OR ROOM SUCH AS A CLOSET. USE BLANKETS OR PILLOWS TO
COVER YOUR BODY AND ALWAYS STAY AWAY FROM WINDOWS.

IF IN MOBILE HOMES OR VEHICLES...EVACUATE THEM AND GET INSIDE A
SUBSTANTIAL SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE
NEAREST DITCH OR OTHER LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

LAT...LON 3974 10403 3964 10393 3959 10356 3985 10336
          4002 10341 4004 10391

RJK

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 3, 6:21 PM MDTSevere Thunderstorm WarningBOUDouglas, Elbert39 min
Jun 3, 6:36 PM MDTSevere Thunderstorm WarningBOUAdams, Arapahoe39 min
Jun 3, 6:54 PM MDTSevere Thunderstorm WarningBOUAdams, Arapahoe, Denver51 min
Jun 3, 7:05 PM MDTSevere Thunderstorm WarningBOUWeld40 min
Jun 3, 7:20 PM MDTSevere Thunderstorm WarningBOUArapahoe, Douglas, Elbert40 min
Jun 3, 7:25 PM MDTSevere Thunderstorm WarningBOUBoulder, Larimer, Weld50 min
Jun 3, 7:45 PM MDTSevere Thunderstorm WarningBOUAdams, Arapahoe, Denver45 min
Jun 3, 7:45 PM MDTSevere Thunderstorm WarningBOUWeld45 min
Jun 3, 11:00 PM MDTSevere Thunderstorm WarningBOUAdams, Denver, Weld45 min
Jun 4, 2:51 PM MDTSevere Thunderstorm WarningBOUAdams, Morgan, Weld39 min
Jun 4, 3:30 PM MDTSevere Thunderstorm WarningBOUAdams, Morgan, Weld45 min
Jun 4, 4:10 PM MDTTornado WarningBOUAdams, Arapahoe, Washington35 min
Jun 4, 4:45 PM MDTSevere Thunderstorm WarningBOUAdams, Arapahoe, Washington45 min

Nearby

Tornado Warnings in Colorado, 2001Every tornado warning in 2001Tornadoes 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.