Alert archive / Colorado / Tornado Warnings in 2000

Tornado Warning 20, NWS Denver/Boulder, CO

July 10, 2000Adams County, Weld County, Colorado

NWS Denver/Boulder, CO issued this tornado warning at Jul 10, 2000, 8:20 PM MDT for Adams County, Weld County, Colorado. It was in force for 25 min. 1 report 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: Jul 10, 2000, 8:20 PM MDT (02:20 UTC)
Expired: Jul 10, 2000, 8:45 PM MDT
In force: 25 min
Issued by: NWS Denver/Boulder, CO
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Adams County, CO, Weld County, CO

What was reported inside it

Time	Report	Where	Remark
Jul 10, 8:38 PM MDT	Tornado F0	Brighton, CO	A small tornado touched down briefly but did no 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, 2.3 hours before the alert went out and 134 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: 63 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 3333 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: -26 m²/s²
0-3 km storm-relative helicity: 28 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 
WFUS55 KBOU 110221
TORDEN

ZCZC DENWRKADM DEF
TTAA00 KDEN 110220

COC001-123-110245-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DENVER CO
820 PM MDT MON JUL 10 2000

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

* TORNADO WARNING FOR...
  EXTREME NORTHWESTERN ADAMS COUNTY IN NORTHEAST COLORADO
  EXTREME SOUTHWESTERN WELD COUNTY IN NORTHEAST COLORADO

* UNTIL 845 PM MDT

* AT 820 PM MDT...THE PUBLIC REPORTED FUNNEL CLOUDS JUST WEST OF     
  BRIGHTON...OR ABOUT 19 MILES NORTH OF DENVER...MOVING NORTHEAST    
  AT 20 MPH.

LOCATIONS IN THE WARNING INCLUDE...BUT ARE NOT LIMITED TO...LOCHBUIE
AND BRIGHTON

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 4003 10492 3995 10483 4000 10461 4011 10469

GIMMESTAD

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 10, 8:40 PM MDT	Tornado Warning	BOU	Adams, Weld	35 min
Jul 10, 9:16 PM MDT	Tornado Warning	BOU	Morgan, Weld	44 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.