Alert archive / Colorado / Tornado Warnings in 2002

Tornado Warning 18, NWS Denver/Boulder, CO

August 24, 2002Washington County, Colorado

NWS Denver/Boulder, CO issued this tornado warning at Aug 24, 2002, 10:32 PM MDT for Washington County, Colorado. It was in force for 43 min. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Aug 24, 2002, 10:32 PM MDT (04:32 UTC)
Expired: Aug 24, 2002, 11:15 PM MDT
In force: 43 min
Issued by: NWS Denver/Boulder, CO
Area: Counties, with a storm outline in the text

County Washington County, CO

The radar

The Goodland radar (KGLD), 119 km from the middle of the area, began a volume at 04:36 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

Time	Report	Where	Remark
Aug 24, 10:35 PM MDT	Hail 1.75	Otis, CO
Aug 24, 11:15 PM MDT	Hail 2	Cope, CO	A severe thunderstorm, producing very large hail and damaging winds, pummeled sections of Logan, Phillips and Washington Counties. Several homes and vehicles were damaged. In addition, several farmers suffered extensive crop damage.

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 00:00Z, 4.5 hours before the alert went out and 24 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: 740 J/kg
Mixed-layer CIN: -10 J/kg
Mixed-layer LCL: 2494 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 31 m²/s²
0-3 km storm-relative helicity: 78 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.7

Open this sounding in Storm Lab

The text

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

684 
WFUS55 KBOU 250432
TORDEN
COC121-250515-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DENVER CO
1031 PM MDT SAT AUG 24 2002

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

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

* UNTIL 1115 PM MDT

* AT 1031 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  THUNDERSTORM WITH A POSSIBLE TORNADO 6 MILES EAST OF ELBA OR 14    
  MILES NORTH OF ARICKAREE SCHOOL...OR ABOUT 17 MILES SOUTHEAST OF   
  AKRON...MOVING SOUTHEAST AT 25 MPH.

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

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.

REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY
WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST
OFFICE IN DENVER.

THIS REPLACES THE SEVERE THUNDERSTORM WARNING THAT WAS IN EFFECT FOR 
THE AREA.

LAT...LON 4001 10299 3990 10316 3957 10296 3957 10282
          3985 10281

GIMMESTAD

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 24, 6:17 PM MDT	Tornado Warning	BOU	Washington	43 min
Aug 24, 6:32 PM MDT	Severe Thunderstorm Warning	BOU	Phillips	43 min
Aug 24, 6:59 PM MDT	Tornado Warning	BOU	Washington	46 min
Aug 24, 7:48 PM MDT	Tornado Warning	BOU	Washington	27 min
Aug 24, 10:22 PM MDT	Severe Thunderstorm Warning	BOU	Washington	53 min
Aug 24, 11:14 PM MDT	Tornado Warning	BOU	Washington	16 min
Aug 25, 1:28 AM MDT	Tornado Warning	BOU	Washington	62 min
Aug 25, 2:00 AM MDT	Tornado Warning	BOU	Washington	60 min
Aug 25, 2:33 AM MDT	Tornado Warning	BOU	Washington	57 min

Nearby

Tornado Warnings in Colorado, 2002 Every tornado warning in 2002 Tornadoes in 2002

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.