Alert archive / Iowa / Tornado Warnings in 2007

Tornado Warning 1, NWS Des Moines, IA

March 24, 2007Butler County, Iowa

NWS Des Moines, IA issued this tornado warning at Mar 24, 2007, 6:46 PM CDT for Butler County, Iowa. It was in force for 29 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
Mar 24, 2007, 6:46 PM CDT (23:46 UTC)
Expired
Mar 24, 2007, 7:15 PM CDT
In force
29 min
Issued by
NWS Des Moines, IA
Area
Counties, with a storm outline in the text

County Butler County, IA

The radar

The Des Moines radar (KDMX), 141 km from the middle of the area, began a volume at 23:49 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

Davenport, (KDVN), launched 12:00Z, 11.8 hours before the alert went out and 234 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, Davenport, at 12:00Z on 2007-03-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 120 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Davenport, at 12:00Z on 2007-03-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 52 square meters per square second.19395878Sfc1 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
120 J/kg
Mixed-layer CIN
-33 J/kg
Mixed-layer LCL
566 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
52 m²/s²
0-3 km storm-relative helicity
63 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

Open this sounding in Storm Lab

The text

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

000 
WFUS53 KDMX 242346
TORDMX
IAC023-250015-
/O.NEW.KDMX.TO.W.0001.070324T2346Z-070325T0015Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
646 PM CDT SAT MAR 24 2007

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHERN BUTLER COUNTY IN NORTH CENTRAL IOWA...

* UNTIL 715 PM CDT

* AT 641 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
  A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. LARGE HAIL 
  IS ALSO POSSIBLE WITH THIS STORM. THIS DANGEROUS STORM WAS LOCATED 
  8 MILES WEST OF ALLISON...OR 25 MILES SOUTHWEST OF CHARLES 
  CITY...AND MOVING EAST AT 30 MPH.

* THIS STORM WILL BE NEAR...
  ALLISON BY 655 PM CDT...
  CLARKSVILLE BY 705 PM CDT...

THE TOWNS OF BRISTOW AND DUMONT ARE ALSO IN THE PATH OF THIS TORNADIC
STORM.

THIS IS A HAZARDOUS SITUATION. SEEK SHELTER IN A BASEMENT...OR IN AN
INTERIOR ROOM. STAY AWAY FROM WINDOWS. IF YOU ARE OUTSIDE OR IN A
CAR...SEEK SHELTER IN A REINFORCED BUILDING.

LAT...LON 4286 9301 4274 9301 4272 9256 4291 9256

$$

MOYER
2 follow-up statements
000 
WWUS53 KDMX 250003
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
702 PM CDT SAT MAR 24 2007

IAC023-250015-
/O.CON.KDMX.TO.W.0001.000000T0000Z-070325T0015Z/
BUTLER IA-
702 PM CDT SAT MAR 24 2007

...A TORNADO WARNING REMAINS IN EFFECT FOR NORTHERN BUTLER COUNTY
UNTIL 715 PM CDT...

AT 658 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS TORNADO WAS
LOCATED NEAR ALLISON...OR 21 MILES SOUTH OF CHARLES CITY...MOVING
EAST AT 25 MPH.

THE TORNADO WILL BE NEAR...
  CLARKSVILLE BY 710 PM CDT...

THE TOWN OF BRISTOW IS ALSO IN THE PATH OF THIS TORNADO.

SEEK SHELTER IN A BASEMENT...OR IN AN INTERIOR ROOM. STAY AWAY FROM
WINDOWS. IF YOU ARE IN A CAR OR OUTSIDE...SEEK SHELTER IN A
REINFORCED BUILDING.

IN ADDITION TO THE TORNADO...THIS STORM IS CAPABLE OF PRODUCING
NICKEL SIZE HAIL AND DESTRUCTIVE STRAIGHT LINE WINDS OF
60 MPH.

LAT...LON 4286 9301 4274 9301 4272 9256 4291 9256

$$

MOYER
000 
WWUS53 KDMX 250017
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
717 PM CDT SAT MAR 24 2007

IAC023-250027-
/O.EXP.KDMX.TO.W.0001.000000T0000Z-070325T0015Z/
BUTLER IA-
717 PM CDT SAT MAR 24 2007

...THE TORNADO WARNING FOR NORTHERN BUTLER COUNTY HAS BEEN ALLOWED TO
EXPIRE...

AT 715 PM CDT...WEATHER SERVICE DOPPLER RADAR INDICATED THAT THE
THUNDERSTORM WHICH PROMPTED THE WARNING HAS WEAKENED...AND NO
LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY. THEREFORE...THE
TORNADO WARNING WILL BE ALLOWED TO EXPIRE.

LAT...LON 4286 9301 4274 9301 4272 9256 4291 9256

$$

MOYER

The office that day

Everything else NWS Des Moines, IA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Mar 23, 10:06 PM CDTDense Fog AdvisoryDMXBlack Hawk, Bremer, Butler, Cerro Gordo, Franklin, Grundy and 12 more12 hr
Mar 24, 5:28 AM CDTSevere Thunderstorm WarningDMXCrawford47 min
Mar 24, 6:42 AM CDTSevere Thunderstorm WarningDMXBoone, Greene33 min

Nearby

Tornado Warnings in Iowa, 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.