Alert archive / Colorado / Tornado Warnings in 2007

Tornado Warning 12, NWS Denver/Boulder, CO

April 26, 2007Adams County, Denver County, Colorado

NWS Denver/Boulder, CO issued this tornado warning at Apr 26, 2007, 6:20 PM MDT for Adams County, Denver County, Colorado. It was in force for 40 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
Apr 26, 2007, 6:20 PM MDT (00:20 UTC)
Expired
Apr 26, 2007, 7:00 PM MDT
In force
40 min
Issued by
NWS Denver/Boulder, CO
Area
Counties, with a storm outline in the text

Counties Adams County, CO, Denver County, CO

The radar

The Denver radar (KFTG), 8 km from the middle of the area, began a volume at 00:20 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 nearest sounding before it

Denver, CO (KDNR), launched 00:00Z, 0.3 hours before the alert went out and 116 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 2007-04-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 12 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 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 2007-04-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 31 square meters per square second.193958Sfc1 km3 km6 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
12 J/kg
Mixed-layer CIN
-25 J/kg
Mixed-layer LCL
2756 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
31 m²/s²
0-3 km storm-relative helicity
96 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 270023
TORBOU
COC001-031-270100-
/O.NEW.KBOU.TO.W.0012.070427T0020Z-070427T0100Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DENVER CO
620 PM MDT THU APR 26 2007

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

* TORNADO WARNING FOR...
  WESTERN ADAMS COUNTY IN NORTHEAST COLORADO
  NORTHEASTERN DENVER COUNTY IN NORTHEAST COLORADO

* UNTIL 700 PM MDT

* AT 620 PM MDT...THE ADAMS COUNTY SHERIFF REPORTED A FUNNEL CLOUD 
  OVER DENVER INTERNATIONAL AIRPORT...OR ABOUT 18 MILES NORTHEAST
  OF DENVER. THIS STORM WAS MOVING SOUTHEAST AT 15 MPH.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO MANILA
  VILLAGE...BENNETT...DENVER INTERNATIONAL AIRPORT AND NORTHEASTERN
  AURORA.

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 3996 10474 3975 10475 3974 10441 3983 10428

$$
BARJENBRUCH
2 follow-up statements
000 
WWUS55 KBOU 270041
SVSBOU

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
640 PM MDT THU APR 26 2007

COC031-270050-
/O.CAN.KBOU.TO.W.0012.000000T0000Z-070427T0100Z/
DENVER CO-
640 PM MDT THU APR 26 2007

...THE TORNADO WARNING FOR DENVER COUNTY IS CANCELLED...

LAT...LON 3990 10456 3975 10463 3974 10432 3983 10428

$$

COC001-270100-
/O.CON.KBOU.TO.W.0012.000000T0000Z-070427T0100Z/
ADAMS CO-
640 PM MDT THU APR 26 2007

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 700 PM MDT FOR SOUTH
CENTRAL ADAMS COUNTY...

AT 634 PM MDT...TRAINED WEATHER SPOTTERS CONTINUED TO REPORT A FUNNEL
CLOUD.  THIS STORM WAS LOCATED 2 MILES WEST OF BENNETT...OR ABOUT 27
MILES EAST OF DENVER. THIS STORM WAS MOVING SOUTHEAST AT 20 MPH.

LOCATIONS REMAINING IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
MANILA VILLAGE AND BENNETT.

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 3990 10456 3975 10463 3974 10432 3983 10428

$$
BARJENBRUCH
000 
WWUS55 KBOU 270103
SVSBOU

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
703 PM MDT THU APR 26 2007

COC001-270113-
/O.EXP.KBOU.TO.W.0012.000000T0000Z-070427T0100Z/
ADAMS CO-
703 PM MDT THU APR 26 2007

...THE TORNADO WARNING FOR SOUTH CENTRAL ADAMS COUNTY EXPIRED AT 700
PM MDT...

THE MOST DANGEROUS PART OF THE THUNDERSTORM HAS MOVED INTO ARAPAHOE
COUNTY.

LAT...LON 3990 10456 3975 10463 3974 10432 3983 10428

$$
BARJENBRUCH

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 26, 7:02 PM MDTTornado WarningBOUArapahoe19 min

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.