Alert archive / Colorado / Tornado Warnings in 2007
Tornado Warning 18, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this tornado warning at May 3, 2007, 7:21 PM MDT for Weld County, Colorado. It was in force for 24 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 3, 2007, 7:21 PM MDT (01:21 UTC)
- Expired
- May 3, 2007, 7:45 PM MDT
- In force
- 24 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Counties, with a storm outline in the text
County Weld County, CO
The radar
The Denver radar (KFTG), 49 km from the middle of the area, began a volume at 01:24 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 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, 1.4 hours before the alert went out and 101 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.
- 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
The text
As transmitted, in the capitals the NWS used until 2016.
000 WFUS55 KBOU 040121 TORBOU COC123-040145- /O.NEW.KBOU.TO.W.0018.070504T0121Z-070504T0145Z/ BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE DENVER CO 721 PM MDT THU MAY 3 2007 THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A * TORNADO WARNING FOR... SOUTH CENTRAL WELD COUNTY IN NORTHEAST COLORADO * UNTIL 745 PM MDT * AT 721 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 6 MILES EAST OF PROSPECT VALLEY...OR ABOUT 29 MILES SOUTHWEST OF FORT MORGAN. THIS STORM WAS MOVING EAST AT 20 MPH. * LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO ROGGEN... RIVERSIDE RESERVOIR AND PROSPECT VALLEY. 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 4032 10445 4001 10443 4001 10416 4033 10417 $$
1 follow-up statement
000 WWUS55 KBOU 040146 SVSBOU SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 745 PM MDT THU MAY 3 2007 COC123-040155- /O.EXP.KBOU.TO.W.0018.000000T0000Z-070504T0145Z/ WELD CO- 745 PM MDT THU MAY 3 2007 ...THE TORNADO WARNING FOR SOUTH CENTRAL WELD COUNTY EXPIRED AT 745 PM MDT... THE THUNDERSTORM THAT PROMPTED THE WARNING WAS ALONG THE WELD...MORGAN COUNTY LINE MOVING EASTWARD INTO WESTERN MORGAN COUNTY. A TORNADO WATCH REMAINS IN EFFECT UNTIL MIDNIGHT MDT FRIDAY MORNING FOR NORTHEAST COLORADO. LAT...LON 4032 10445 4001 10443 4001 10416 4033 10417 $$
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, 6:50 PM MDT | Tornado Warning | BOU | Weld | 40 min |
| May 3, 7:04 PM MDT | Tornado Warning | BOU | Morgan | 41 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, 2007Every tornado warning in 2007Tornadoes 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.