Alert archive / Colorado / Tornado Warnings in 2007
Tornado Warning 7, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this tornado warning at Apr 23, 2007, 7:15 PM MDT for Logan County, Colorado. It was in force for 45 min. 6 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
- Apr 23, 2007, 7:15 PM MDT (01:15 UTC)
- Expired
- Apr 23, 2007, 8:00 PM MDT
- In force
- 45 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), 145 km from the middle of the area, began a volume at 01:17 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 |
|---|---|---|---|
| Apr 23, 7:16 PM MDT | HAIL 0.75 | 4 W Sterling, CO | |
| Apr 23, 7:20 PM MDT | HAIL 1.75 | 8 Sw Sterling, CO | |
| Apr 23, 7:32 PM MDT | HAIL 1.75 | Atwood, CO | |
| Apr 23, 7:35 PM MDT | HAIL 1.75 | Sterling, CO | |
| Apr 23, 7:43 PM MDT | HAIL 1 | 4 S Sterling, CO | |
| Apr 23, 7:48 PM MDT | HAIL 1.25 | 1 N Sterling, 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 |
|---|---|---|---|
| Apr 23, 2:10 PM MDT | Tornado Watch | SPC | 10 hr |
The nearest sounding before it
Denver, CO (KDNR), launched 00:00Z, 1.3 hours before the alert went out and 85 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
- 351 J/kg
- Mixed-layer CIN
- -75 J/kg
- Mixed-layer LCL
- 1440 m above ground
- 0-6 km bulk shear
- 56 kt
- 0-1 km storm-relative helicity
- 187 m²/s²
- 0-3 km storm-relative helicity
- 380 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 4.5
The text
As transmitted, in the capitals the NWS used until 2016.
000 WFUS55 KBOU 240115 TORBOU COC075-240200- /O.NEW.KBOU.TO.W.0007.070424T0115Z-070424T0200Z/ BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE DENVER CO 715 PM MDT MON APR 23 2007 THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A * TORNADO WARNING FOR... CENTRAL LOGAN COUNTY IN NORTHEAST COLORADO * UNTIL 800 PM MDT * AT 715 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 3 MILES NORTHEAST OF MERINO...OR ABOUT 10 MILES SOUTHWEST OF STERLING. THIS STORM WAS MOVING EAST AT 15 MPH. THIS STORM WILL ALSO PRODUCE HAIL UP TO 1.5 INCHES IN DIAMETER. * LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO MERINO... LOGAN CORNERS...ILIFF...ATWOOD AND STERLING. 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 4074 10349 4044 10344 4044 10283 4079 10288 $$ BARJENBRUCH
1 follow-up statement
000 WWUS55 KBOU 240134 SVSBOU SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 731 PM MDT MON APR 23 2007 COC075-240200- /O.CON.KBOU.TO.W.0007.000000T0000Z-070424T0200Z/ LOGAN CO- 731 PM MDT MON APR 23 2007 ...A TORNADO WARNING REMAINS IN EFFECT UNTIL 800 PM MDT FOR CENTRAL LOGAN COUNTY... AT 731 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS STORM WAS LOCATED 2 MILES WEST OF STERLING. THIS STORM WAS MOVING EAST AT 15 MPH...TOWARD STERLING...AND HAS ALREADY PRODUCED NUMEROUS FUNNELS. PEOPLE IN STERLING SHOULD TAKE COVER IMMEDIATELY THIS STORM WILL ALSO PRODUCE GOLF BALL SIZED HAIL. LOCATIONS REMAINING IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO ILIFF...ATWOOD AND STERLING. THE SAFEST PLACE TO BE DURING A TORNADO IS IN A BASEMENT. GET UNDER A WORKBENCH OR OTHER PIECE OF STURDY FURNITURE. IF NO BASEMENT IS AVAILABLE...SEEK SHELTER ON THE LOWEST FLOOR OF THE BUILDING IN AN INTERIOR HALLWAY OR ROOM SUCH AS A CLOSET. USE BLANKETS OR PILLOWS TO COVER YOUR BODY AND ALWAYS STAY AWAY FROM WINDOWS. IF IN MOBILE HOMES OR VEHICLES...EVACUATE THEM AND GET INSIDE A SUBSTANTIAL SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE NEAREST DITCH OR OTHER LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS. A TORNADO WATCH REMAINS IN EFFECT UNTIL 900 PM MDT MONDAY EVENING FOR NORTHEASTERN COLORADO. LAT...LON 4072 10336 4046 10333 4044 10283 4079 10288 $$ BARJENBRUCH
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 23, 6:04 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Arapahoe | 56 min |
| Apr 23, 6:18 PM MDT | Severe Thunderstorm Warning | BOU | Elbert | 57 min |
| Apr 23, 6:27 PM MDT | Tornado Warning | BOU | Logan | 48 min |
| Apr 23, 6:59 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Morgan, Washington | 61 min |
| Apr 23, 7:43 PM MDT | Severe Thunderstorm Warning | BOU | Arapahoe | 28 min |
| Apr 23, 7:51 PM MDT | Tornado Warning | BOU | Morgan, Washington | 39 min |
| Apr 23, 8:02 PM MDT | Severe Thunderstorm Warning | BOU | Logan | 58 min |
| Apr 23, 8:20 PM MDT | Severe Thunderstorm Warning | BOU | Lincoln | 30 min |
| Apr 23, 8:38 PM MDT | Severe Thunderstorm Warning | BOU | Washington | 67 min |
| Apr 23, 9:46 PM MDT | Severe Thunderstorm Warning | BOU | Washington | 59 min |
| Apr 23, 10:41 PM MDT | Severe Thunderstorm Warning | BOU | Washington | 43 min |
| Apr 23, 10:57 PM MDT | Tornado Warning | BOU | Phillips | 33 min |
| Apr 24, 5:31 AM MDT | Snow Advisory | BOU | Park | 10 hr |
| Apr 24, 12:19 PM MDT | Tornado Warning | BOU | Lincoln | 41 min |
| Apr 24, 12:58 PM MDT | Tornado Warning | BOU | Lincoln | 47 min |
| Apr 24, 3:46 PM MDT | Snow and Blowing Snow Advisory | BOU | Adams, Arapahoe, Boulder, Elbert, Grand, Jackson and 2 more | 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.