Alert archive / Colorado / Tornado Warnings in 2000

Tornado Warning 37, NWS Denver/Boulder, CO

July 21, 2000Washington County, Colorado

NWS Denver/Boulder, CO issued this tornado warning at Jul 21, 2000, 6:17 PM MDT for Washington County, Colorado. It was in force for 43 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 21, 2000, 6:17 PM MDT (00:17 UTC)
Expired: Jul 21, 2000, 7:00 PM MDT
In force: 43 min
Issued by: NWS Denver/Boulder, CO
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Washington County, CO

The radar

The Goodland radar (KGLD), 125 km from the middle of the area, began a volume at 00:21 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 00:00Z, 0.3 hours before the alert went out and 17 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: 941 J/kg
Mixed-layer CIN: -38 J/kg
Mixed-layer LCL: 3104 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: -69 m²/s²
0-3 km storm-relative helicity: -19 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -1.0

Open this sounding in Storm Lab

The text

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

354 
WFUS55 KBOU 220018
TORDEN
COC121-220100-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DENVER CO
617 PM MDT FRI JUL 21 2000

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHEASTERN WASHINGTON COUNTY IN NORTHEAST COLORADO

* UNTIL 700 PM MDT

* AT 617 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  THUNDERSTORM WITH A POSSIBLE TORNADO 7 MILES NORTHWEST OF ARICKAREE
  SCHOOL...OR ABOUT 23 MILES SOUTH OF AKRON...MOVING SOUTHEAST AT 15
  MPH.

LOCATIONS IN THE WARNING INCLUDE...BUT ARE NOT LIMITED TO...ELBA...
COPE AND ARICKAREE SCHOOL.

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 3996 10321 3958 10317 3958 10282 3998 10282

KLEYLA

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 21, 6:01 PM MDT	Tornado Warning	BOU	Morgan, Weld	44 min
Jul 21, 6:27 PM MDT	Tornado Warning	BOU	Morgan, Weld	48 min
Jul 21, 6:50 PM MDT	Tornado Warning	BOU	Washington	25 min
Jul 21, 7:04 PM MDT	Severe Thunderstorm Warning	BOU	Adams, Morgan	41 min
Jul 21, 7:18 PM MDT	Tornado Warning	BOU	Washington	27 min
Jul 21, 7:21 PM MDT	Severe Thunderstorm Warning	BOU	Sedgwick	39 min
Jul 21, 7:45 PM MDT	Severe Thunderstorm Warning	BOU	Lincoln, Washington	45 min
Jul 21, 7:51 PM MDT	Severe Thunderstorm Warning	BOU	Phillips, Sedgwick	39 min
Jul 21, 11:44 PM MDT	Severe Thunderstorm Warning	BOU	Lincoln	46 min
Jul 22, 12:19 AM MDT	Severe Thunderstorm Warning	BOU	Lincoln	41 min
Jul 22, 12:56 AM MDT	Severe Thunderstorm Warning	BOU	Lincoln	34 min
Jul 22, 1:08 AM MDT	Severe Thunderstorm Warning	BOU	Adams, Arapahoe	37 min
Jul 22, 1:36 AM MDT	Severe Thunderstorm Warning	BOU	Arapahoe, Elbert	39 min
Jul 22, 2:12 AM MDT	Severe Thunderstorm Warning	BOU	Elbert, Lincoln	33 min
Jul 22, 2:45 AM MDT	Severe Thunderstorm Warning	BOU	Lincoln	45 min
Jul 22, 5:49 PM MDT	Severe Thunderstorm Warning	BOU	Weld	41 min

Nearby

Tornado Warnings in Colorado, 2000 Every tornado warning in 2000 Tornadoes in 2000

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.