Alert archive / Colorado / Tornado Warnings in 2004

Tornado Warning 18, NWS Denver/Boulder, CO

June 9, 2004Logan County, Colorado

NWS Denver/Boulder, CO issued this tornado warning at Jun 9, 2004, 6:58 PM MDT for Logan County, Colorado. It was in force for 47 min. 20 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: Jun 9, 2004, 6:58 PM MDT (00:58 UTC)
Expired: Jun 9, 2004, 7:45 PM MDT
In force: 47 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), 139 km from the middle of the area, began a volume at 00:59 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
Jun 9, 7:19 PM MDT	TSTM WND DMG	Sterling, CO	POSSIBLE TORNADO. 3 FOOT WIDE COTTONWOOD TREES RIPPED IN HALF. POWER LINES DOWN
Jun 9, 7:19 PM MDT	TSTM WND DMG	Sterling, CO	POSSIBLE TORNADO. 3 FOOT WIDE COTTONWOOD TREES RIPPED IN HALF. POWER LINES DOWN
Jun 9, 7:19 PM MDT	TSTM WND DMG	Sterling, CO	POSSIBLE TORNADO. 3 FOOT WIDE COTTONWOOD TREES RIPPED IN HALF. POWER LINES DOWN
Jun 9, 7:19 PM MDT	TSTM WND DMG	Sterling, CO	POSSIBLE TORNADO. 3 FOOT WIDE COTTONWOOD TREES RIPPED IN HALF. POWER LINES DOWN
Jun 9, 7:19 PM MDT	TSTM WND DMG	Sterling, CO	POSSIBLE TORNADO. 3 FOOT WIDE COTTONWOOD TREES RIPPED IN HALF. POWER LINES DOWN
Jun 9, 7:19 PM MDT	TSTM WND DMG	Sterling, CO	POSSIBLE TORNADO. 3 FOOT WIDE COTTONWOOD TREES RIPPED IN HALF. POWER LINES DOWN
Jun 9, 7:19 PM MDT	TSTM WND DMG	Sterling, CO	POSSIBLE TORNADO. 3 FOOT WIDE COTTONWOOD TREES RIPPED IN HALF. POWER LINES DOWN
Jun 9, 7:19 PM MDT	TSTM WND DMG	Sterling, CO	POSSIBLE TORNADO. 3 FOOT WIDE COTTONWOOD TREES RIPPED IN HALF. POWER LINES DOWN
Jun 9, 7:19 PM MDT	TSTM WND DMG	Sterling, CO	POSSIBLE TORNADO. 3 FOOT WIDE COTTONWOOD TREES RIPPED IN HALF. POWER LINES DOWN
Jun 9, 7:19 PM MDT	TSTM WND DMG	Sterling, CO	POSSIBLE TORNADO. 3 FOOT WIDE COTTONWOOD TREES RIPPED IN HALF. POWER LINES DOWN
Jun 9, 7:25 PM MDT	TORNADO	Sterling, CO	1 HOUSE DESTROYED. TREES KNOCKED DOWN IN STREETS. CAR DEALERSHIP HAD ROOF BLOWN OFF. POWER LINES DOWN.
Jun 9, 7:25 PM MDT	TORNADO	Sterling, CO	1 HOUSE DESTROYED. TREES KNOCKED DOWN IN STREETS. CAR DEALERSHIP HAD ROOF BLOWN OFF. POWER LINES DOWN.
Jun 9, 7:25 PM MDT	TORNADO	Sterling, CO	1 HOUSE DESTROYED. TREES KNOCKED DOWN IN STREETS. CAR DEALERSHIP HAD ROOF BLOWN OFF. POWER LINES DOWN.
Jun 9, 7:25 PM MDT	TORNADO	Sterling, CO	1 HOUSE DESTROYED. TREES KNOCKED DOWN IN STREETS. CAR DEALERSHIP HAD ROOF BLOWN OFF. POWER LINES DOWN.
Jun 9, 7:25 PM MDT	TORNADO	Sterling, CO	1 HOUSE DESTROYED. TREES KNOCKED DOWN IN STREETS. CAR DEALERSHIP HAD ROOF BLOWN OFF. POWER LINES DOWN.
Jun 9, 7:25 PM MDT	TORNADO	Sterling, CO	1 HOUSE DESTROYED. TREES KNOCKED DOWN IN STREETS. CAR DEALERSHIP HAD ROOF BLOWN OFF. POWER LINES DOWN.
Jun 9, 7:25 PM MDT	TORNADO	Sterling, CO	1 HOUSE DESTROYED. TREES KNOCKED DOWN IN STREETS. CAR DEALERSHIP HAD ROOF BLOWN OFF. POWER LINES DOWN.
Jun 9, 7:25 PM MDT	TORNADO	Sterling, CO	1 HOUSE DESTROYED. TREES KNOCKED DOWN IN STREETS. CAR DEALERSHIP HAD ROOF BLOWN OFF. POWER LINES DOWN.
Jun 9, 7:25 PM MDT	TORNADO	Sterling, CO	1 HOUSE DESTROYED. TREES KNOCKED DOWN IN STREETS. CAR DEALERSHIP HAD ROOF BLOWN OFF. POWER LINES DOWN.
Jun 9, 7:25 PM MDT	TORNADO	Sterling, CO	1 HOUSE DESTROYED. TREES KNOCKED DOWN IN STREETS. CAR DEALERSHIP HAD ROOF BLOWN OFF. POWER LINES DOWN.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

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 9, 1:40 PM MDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Denver, CO (KDNR), launched 00:00Z, 1.0 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: 484 J/kg
Mixed-layer CIN: -150 J/kg
Mixed-layer LCL: 1212 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 116 m²/s²
0-3 km storm-relative helicity: 380 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 6.3

Open this sounding in Storm Lab

The text

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

239 
WFUS55 KBOU 100058
TORBOU
COC075-100145-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DENVER CO
658 PM MDT WED JUN 9 2004

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

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

* UNTIL 745 PM MDT

* AT 658 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  THUNDERSTORM WITH A POSSIBLE TORNADO NEAR MERINO...OR ABOUT 13
  MILES SOUTHWEST OF STERLING...MOVING NORTHEAST AT 15 MPH.

LOCATIONS IN THE WARNING INCLUDE...BUT ARE NOT LIMITED TO...
STERLING...ATWOOD...ILIFF...LOGAN CORNERS...MERINO...NORTH STERLING
RESERVOIR AND PADRONI.

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 4083 10352 4046 10344 4046 10293 4082 10294

$$

RPK

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 9, 6:17 PM MDT	Flash Flood Warning	BOU	Morgan, Weld	3 hr
Jun 9, 6:18 PM MDT	Flash Flood Warning	BOU	Washington	117 min
Jun 9, 7:08 PM MDT	Flash Flood Warning	BOU	Logan	3 hr
Jun 10, 1:36 PM MDT	Severe Thunderstorm Warning	BOU	Logan, Sedgwick	54 min

Nearby

Tornado Warnings in Colorado, 2004 Every tornado warning in 2004 Tornadoes in 2004

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.