Alert archive / Colorado / Tornado Warnings in 2007

Tornado Warning 16, NWS Denver/Boulder, CO

May 3, 2007Weld County, Colorado

NWS Denver/Boulder, CO issued this tornado warning at May 3, 2007, 6:50 PM MDT for Weld County, Colorado. It was in force for 40 min. 1 report 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: May 3, 2007, 6:50 PM MDT (00:50 UTC)
Expired: May 3, 2007, 7:30 PM MDT
In force: 40 min
Issued by: NWS Denver/Boulder, CO
Area: Counties, with a storm outline in the text

County Weld County, CO

The radar

The Cheyenne radar (KCYS), 84 km from the middle of the area, began a volume at 00:50 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
May 3, 7:35 PM MDT	HAIL 0.75	4 S Buckingham, CO

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
May 3, 4:17 PM MDT	Severe Thunderstorm Watch	SPC	6 hr
May 3, 6:43 PM MDT	Tornado Watch	SPC	5 hr

The nearest sounding before it

Denver, CO (KDNR), launched 00:00Z, 0.8 hours before the alert went out and 119 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: 394 J/kg
Mixed-layer CIN: -118 J/kg
Mixed-layer LCL: 2658 m above ground
0-6 km bulk shear: 73 kt
0-1 km storm-relative helicity: 209 m²/s²
0-3 km storm-relative helicity: 338 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.2

Open this sounding in Storm Lab

The text

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

000 
WFUS55 KBOU 040052
TORBOU
COC123-040130-
/O.NEW.KBOU.TO.W.0016.070504T0050Z-070504T0130Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DENVER CO
650 PM MDT THU MAY 3 2007

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHEASTERN WELD COUNTY IN NORTHEAST COLORADO

* UNTIL 730 PM MDT

* AT 650 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A 
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING TORNADOES FROM 
EAST OF HEREFORD TO BRIGGSDALE TO EAST OF CORNISH. THIS LINE OF 
STORMS WAS MOVING EAST AT 25 MPH.  

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO STONEHAM...
  PAWNEE BUTTES...NEW RAYMER AND KEOTA.

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 4099 10411 4053 10416 4053 10360 4099 10358

$$

1 follow-up statement

000 
WWUS55 KBOU 040107
SVSBOU

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
706 PM MDT THU MAY 3 2007

COC123-040130-
/O.CON.KBOU.TO.W.0016.000000T0000Z-070504T0130Z/
WELD CO-
706 PM MDT THU MAY 3 2007

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 730 PM MDT FOR
NORTHEASTERN WELD COUNTY...

AT 706 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING 
TORNADOES.  THESE STORMS WERE LOCATED FROM 10 MILES NORTH OF PAWNEE 
BUTTES TO KEOTA TO BUCKINGHAM. THESE STORMS WERE MOVING EAST 
AT 25 MPH.

LOCATIONS REMAINING IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
STONEHAM...PAWNEE BUTTES...NEW RAYMER AND KEOTA.

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 MIDNIGHT MDT FRIDAY MORNING
FOR NORTHEAST COLORADO.

LAT...LON 4099 10411 4053 10416 4053 10360 4099 10358

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
May 3, 6:11 PM MDT	Tornado Warning	BOU	Weld	49 min
May 3, 7:04 PM MDT	Tornado Warning	BOU	Morgan	41 min
May 3, 7:21 PM MDT	Tornado Warning	BOU	Weld	24 min
May 3, 7:27 PM MDT	Tornado Warning	BOU	Weld	48 min
May 3, 7:41 PM MDT	Tornado Warning	BOU	Morgan	49 min
May 3, 8:12 PM MDT	Severe Thunderstorm Warning	BOU	Logan, Weld	48 min
May 3, 8:28 PM MDT	Severe Thunderstorm Warning	BOU	Morgan	47 min
May 4, 3:32 PM MDT	Snow Advisory	BOU	Boulder, Grand, Jackson, Larimer	12 hr

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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.