Alert archive / Colorado / Tornado Warnings in 2007

Tornado Warning 6, NWS Denver/Boulder, CO

April 23, 2007Logan County, Colorado

NWS Denver/Boulder, CO issued this tornado warning at Apr 23, 2007, 6:27 PM MDT for Logan County, Colorado. It was in force for 48 min. 4 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, 6:27 PM MDT (00:27 UTC)
Expired
Apr 23, 2007, 7:15 PM MDT
In force
48 min
Issued by
NWS Denver/Boulder, CO
Area
Counties, with a storm outline in the text

County Logan County, CO

The radar

The Denver radar (KFTG), 131 km from the middle of the area, began a volume at 00:27 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

TimeReportWhereRemark
Apr 23, 6:55 PM MDTHAIL 18 E Stoneham, CO
Apr 23, 7:03 PM MDTHAIL 0.7512 E Stoneham, CO
Apr 23, 7:16 PM MDTHAIL 0.754 W Sterling, CO
Apr 23, 7:20 PM MDTHAIL 1.758 Sw 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.

IssuedProductOfficeLasted
Apr 23, 2:10 PM MDTTornado WatchSPC10 hr

The nearest sounding before it

Denver, CO (KDNR), launched 00:00Z, 0.5 hours before the alert went out and 83 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-pSkew-T log-p diagram, Denver, CO at 00:00Z on 2007-04-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 351 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Denver, CO at 00:00Z on 2007-04-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 187 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
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
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

Open this sounding in Storm Lab

The text

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

000 
WFUS55 KBOU 240028
TORBOU
COC075-240115-
/O.NEW.KBOU.TO.W.0006.070424T0027Z-070424T0115Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DENVER CO
627 PM MDT MON APR 23 2007

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHWESTERN LOGAN COUNTY IN NORTHEAST COLORADO

* UNTIL 715 PM MDT

* AT 627 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 5 MILES
  SOUTHWEST OF WILLARD...OR ABOUT 20 MILES SOUTHWEST OF STERLING.
  THIS STORM WAS MOVING NORTHEAST AT 15 MPH.  THIS STORM WILL ALSO
  PRODUCE HAIL UP TO 1 INCH IN DIAMETER.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO WILLARD...
  PAWNEE PASS...NORTH STERLING RESERVOIR...LOGAN CORNERS 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 4058 10358 4052 10358 4052 10341 4060 10311
      4080 10329

$$
BARJENBRUCH

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 23, 6:04 PM MDTSevere Thunderstorm WarningBOUAdams, Arapahoe56 min
Apr 23, 6:18 PM MDTSevere Thunderstorm WarningBOUElbert57 min
Apr 23, 6:59 PM MDTSevere Thunderstorm WarningBOUAdams, Morgan, Washington61 min
Apr 23, 7:15 PM MDTTornado WarningBOULogan45 min
Apr 23, 7:43 PM MDTSevere Thunderstorm WarningBOUArapahoe28 min
Apr 23, 7:51 PM MDTTornado WarningBOUMorgan, Washington39 min
Apr 23, 8:02 PM MDTSevere Thunderstorm WarningBOULogan58 min
Apr 23, 8:20 PM MDTSevere Thunderstorm WarningBOULincoln30 min
Apr 23, 8:38 PM MDTSevere Thunderstorm WarningBOUWashington67 min
Apr 23, 9:46 PM MDTSevere Thunderstorm WarningBOUWashington59 min
Apr 23, 10:41 PM MDTSevere Thunderstorm WarningBOUWashington43 min
Apr 23, 10:57 PM MDTTornado WarningBOUPhillips33 min
Apr 24, 5:31 AM MDTSnow AdvisoryBOUPark10 hr
Apr 24, 12:19 PM MDTTornado WarningBOULincoln41 min
Apr 24, 12:58 PM MDTTornado WarningBOULincoln47 min
Apr 24, 3:46 PM MDTSnow and Blowing Snow AdvisoryBOUAdams, Arapahoe, Boulder, Elbert, Grand, Jackson and 2 more12 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.