Alert archive / Colorado / Tornado Warnings in 2007

Tornado Warning 28, NWS Denver/Boulder, CO

May 4, 2007Washington County, Colorado

NWS Denver/Boulder, CO issued this tornado warning at May 4, 2007, 9:32 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 as issued.

The facts

Issued: May 4, 2007, 9:32 PM MDT (03:32 UTC)
Expired: May 4, 2007, 10:15 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), 121 km from the middle of the area, began a volume at 03:32 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
May 4, 5:36 PM MDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Denver, CO (KDNR), launched 00:00Z, 3.5 hours before the alert went out and 22 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: 1202 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 201 m²/s²
0-3 km storm-relative helicity: 761 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 050332
TORBOU
COC121-050415-
/O.NEW.KBOU.TO.W.0028.070505T0332Z-070505T0415Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DENVER CO
932 PM MDT FRI MAY 4 2007

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

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

* UNTIL 1015 PM MDT

* AT 932 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 4 MILES SOUTH OF
  ARICKAREE SCHOOL...OR ABOUT 35 MILES SOUTH OF AKRON. THIS STORM WAS
  MOVING NORTHEAST AT 30 MPH.  ANOTHER STORM CAPABLE OF PRODUCING A 
  TORNADO WAS LOCATED ABOUT 7 MILES EAST OF ELBA...ALSO MOVING 
  NORTHEAST AT 30 MPH.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO 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 3957 10320 3957 10309 3958 10282 4012 10279
      4011 10301

$$
BARJENBRUCH

2 follow-up statements

000 
WWUS55 KBOU 050400
SVSBOU

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
958 PM MDT FRI MAY 4 2007

COC121-050415-
/O.CON.KBOU.TO.W.0028.000000T0000Z-070505T0415Z/
WASHINGTON CO-
958 PM MDT FRI MAY 4 2007

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1015 PM MDT FOR
SOUTHEASTERN WASHINGTON COUNTY...

AT 958 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING 
TORNADOES.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM 8 
MILES SOUTHWEST OF YUMA TO 10 MILES NORTHEAST OF ARICKAREE SCHOOL TO 
8 MILES SOUTHWEST OF COPE....OR ALONG A LINE EXTENDING FROM 20 MILES 
EAST OF AKRON TO 27 MILES SOUTHEAST OF AKRON TO 39 MILES SOUTH OF 
AKRON. THESE STORMS WERE MOVING NORTHEAST AT 30 MPH.

LOCATIONS REMAINING IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
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.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 100 AM MDT SATURDAY MORNING
FOR NORTHEASTERN COLORADO.

LAT...LON 3957 10320 3957 10309 3958 10282 4012 10279
      4011 10301

$$
BARJENBRUCH

000 
WWUS55 KBOU 050425
SVSBOU

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
1024 PM MDT FRI MAY 4 2007

COC121-050434-
/O.EXP.KBOU.TO.W.0028.000000T0000Z-070505T0415Z/
WASHINGTON CO-
1024 PM MDT FRI MAY 4 2007

...THE TORNADO WARNING FOR SOUTHEASTERN WASHINGTON COUNTY EXPIRED AT
1015 PM MDT...

THE MOST DANGEROUS PART OF THE THUNDERSTORM THAT PROMPTED THE 
WARNING HAD MOVED INTO YUMA COUNTY.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 100 AM MDT SATURDAY MORNING
FOR NORTHEASTERN COLORADO.

LAT...LON 3957 10320 3957 10309 3958 10282 4012 10279
      4011 10301

$$
BARJENBRUCH

The office that day

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

Issued	Product	Office	Counties	Lasted
May 4, 6:21 PM MDT	Severe Thunderstorm Warning	BOU	Arapahoe	39 min
May 4, 6:39 PM MDT	Severe Thunderstorm Warning	BOU	Lincoln	38 min
May 4, 6:41 PM MDT	Tornado Warning	BOU	Arapahoe	31 min
May 4, 6:58 PM MDT	Tornado Warning	BOU	Washington	47 min
May 4, 8:15 PM MDT	Tornado Warning	BOU	Lincoln	45 min
May 4, 8:42 PM MDT	Tornado Warning	BOU	Elbert, Lincoln	48 min
May 4, 8:44 PM MDT	Tornado Warning	BOU	Washington	46 min
May 4, 9:00 PM MDT	Tornado Warning	BOU	Lincoln	45 min
May 4, 9:28 PM MDT	Tornado Warning	BOU	Lincoln	47 min
May 4, 10:15 PM MDT	Tornado Warning	BOU	Lincoln	30 min
May 4, 11:00 PM MDT	Severe Thunderstorm Warning	BOU	Phillips, Sedgwick	60 min
May 4, 11:22 PM MDT	Tornado Warning	BOU	Phillips, Sedgwick	38 min
May 5, 11:25 AM MDT	Severe Thunderstorm Warning	BOU	Logan	16 min
May 5, 11:58 AM MDT	Tornado Warning	BOU	Logan	47 min
May 5, 12:37 PM MDT	Tornado Warning	BOU	Logan	28 min
May 5, 4:01 PM MDT	Tornado Warning	BOU	Adams	29 min

Nearby

Tornado Warnings in Colorado, 2007 Every tornado warning in 2007 Tornadoes in 2007

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.