Alert archive / Colorado / Tornado Warnings in 2003

Tornado Warning 30, NWS Denver/Boulder, CO

June 20, 2003Logan County, Colorado

NWS Denver/Boulder, CO issued this tornado warning at Jun 20, 2003, 5:53 PM MDT for Logan County, Colorado. It was in force for 52 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jun 20, 2003, 5:53 PM MDT (23:53 UTC)
Expired: Jun 20, 2003, 6:45 PM MDT
In force: 52 min
Issued by: NWS Denver/Boulder, CO
Area: Counties, with a storm outline in the text

County Logan County, CO

The radar

The Cheyenne radar (KCYS), 151 km from the middle of the area, began a volume at 23:53 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jun 20, 12:45 PM MDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Denver, CO (KDNR), launched 12:00Z, 11.9 hours before the alert went out and 90 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1432 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: -7 m²/s²
0-3 km storm-relative helicity: -35 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.

191 
WFUS55 KBOU 202353
TORBOU
COC075-210045-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DENVER CO
553 PM MDT FRI JUN 20 2003

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

* TORNADO WARNING FOR...
  LOGAN COUNTY IN NORTHEAST COLORADO
  THIS INCLUDES THE CITY OF STERLING

* UNTIL 645 PM MDT

* AT 553 PM MDT...THE PUBLIC REPORTED A TORNADO 5 MILES EAST OF
  ATWOOD...OR ABOUT 6 MILES SOUTH OF STERLING...MOVING NORTH AT 30
  MPH.

LOCATIONS IN THE WARNING INCLUDE...BUT ARE NOT LIMITED TO...
STERLING...ATWOOD...CROOK...FLEMING...ILIFF...LOGAN CORNERS...
MERINO...NORTH STERLING RESERVOIR...PADRONI...PEETZ...PROCTOR...ST
PETERSBURG AND TWIN BUTTES.

IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER IN A NEARBY REINFORCED
BUILDING. AS A LAST RESORT...SEEK SHELTER IN A CULVERT...DITCH OR LOW
SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

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 4046 10342 4046 10269 4099 10268 4099 10342

$$
GARD...WFO BOULDER

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 20, 11:53 AM MDT	Severe Thunderstorm Warning	BOU	Douglas, Jefferson, Park	52 min
Jun 20, 12:22 PM MDT	Severe Thunderstorm Warning	BOU	Broomfield, Jefferson	38 min
Jun 20, 12:32 PM MDT	Severe Thunderstorm Warning	BOU	Adams, Arapahoe, Broomfield, Denver, Douglas, Elbert	58 min
Jun 20, 3:05 PM MDT	Severe Thunderstorm Warning	BOU	Morgan	40 min
Jun 20, 3:17 PM MDT	Severe Thunderstorm Warning	BOU	Adams	43 min
Jun 20, 3:48 PM MDT	Severe Thunderstorm Warning	BOU	Adams, Morgan	57 min
Jun 20, 4:41 PM MDT	Severe Thunderstorm Warning	BOU	Morgan	64 min
Jun 20, 5:06 PM MDT	Severe Thunderstorm Warning	BOU	Washington	54 min

Nearby

Tornado Warnings in Colorado, 2003 Every tornado warning in 2003 Tornadoes in 2003

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.