Alert archive / Iowa / Tornado Warnings in 2007

Tornado Warning 57, NWS Des Moines, IA

October 2, 2007Clarke County, Lucas County, Warren County, Iowa

NWS Des Moines, IA issued this tornado warning at Oct 2, 2007, 4:55 PM CDT for Clarke County, Lucas County, Warren County, Iowa. It was in force for 18 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
Oct 2, 2007, 4:55 PM CDT (21:55 UTC)
Expired
Oct 2, 2007, 5:13 PM CDT
In force
18 min
Issued by
NWS Des Moines, IA
Area
Storm-based polygon

Counties Clarke County, IA, Lucas County, IA, Warren County, IA

The radar

The Des Moines radar (KDMX), 63 km from the middle of the area, began a volume at 21:58 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

Omaha, NE (KOAX), launched 12:00Z, 9.9 hours before the alert went out and 237 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, Omaha, NE at 12:00Z on 2007-10-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 116 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Omaha, NE at 12:00Z on 2007-10-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 299 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
116 J/kg
Mixed-layer CIN
-312 J/kg
Mixed-layer LCL
1005 m above ground
0-6 km bulk shear
51 kt
0-1 km storm-relative helicity
299 m²/s²
0-3 km storm-relative helicity
273 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

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

000 
WFUS53 KDMX 022155
TORDMX
IAC039-117-181-022245-
/O.NEW.KDMX.TO.W.0057.071002T2155Z-071002T2245Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
455 PM CDT TUE OCT 2 2007

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHEASTERN CLARKE COUNTY IN SOUTH CENTRAL IOWA...
  NORTHWESTERN LUCAS COUNTY IN SOUTH CENTRAL IOWA...
  SOUTHEASTERN WARREN COUNTY IN SOUTH CENTRAL IOWA...

* UNTIL 545 PM CDT.

* AT 454 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 10 MILES WEST OF
  LACONA...OR ABOUT 28 MILES SOUTH OF DES MOINES...MOVING EAST AT 50
  MPH.

* THE TORNADO WILL BE NEAR...
  LACONA AND 6 MILES SOUTH OF MILO BY 505 PM CDT...

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 4121 9371 4137 9336 4116 9335 4115 9340
      4113 9344 4104 9368 4116 9370
TIME...MOT...LOC 2155Z 254DEG 45KT 4118 9357

$$

RUSSELL
2 follow-up statements
000 
WWUS53 KDMX 022210
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
509 PM CDT TUE OCT 2 2007

IAC039-117-181-022245-
/O.CON.KDMX.TO.W.0057.000000T0000Z-071002T2245Z/
LUCAS IA-CLARKE IA-WARREN IA-
509 PM CDT TUE OCT 2 2007

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 545 PM CDT FOR
SOUTHEASTERN WARREN...NORTHEASTERN CLARKE AND NORTHWESTERN LUCAS
COUNTIES...

AT 507 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE A THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS STORM 
WAS LOCATED NEAR LACONA...OR ABOUT 28 MILES SOUTHEAST OF DES 
MOINES...MOVING EAST AT 50 MPH.

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.

LAT...LON 4121 9371 4137 9336 4116 9335 4115 9340
      4113 9344 4104 9368 4116 9370
TIME...MOT...LOC 2209Z 254DEG 45KT 4122 9334

$$

BOKSA
000 
WWUS53 KDMX 022213
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
513 PM CDT TUE OCT 2 2007

IAC039-117-181-022223-
/O.CAN.KDMX.TO.W.0057.000000T0000Z-071002T2245Z/
LUCAS IA-CLARKE IA-WARREN IA-
513 PM CDT TUE OCT 2 2007

...THE TORNADO WARNING FOR SOUTHEASTERN WARREN...NORTHEASTERN CLARKE
AND NORTHWESTERN LUCAS COUNTIES IS CANCELLED...

AT 511 PM CDT...WEATHER SERVICE DOPPLER RADAR INDICATED THAT THE 
THUNDERSTORMS WHICH PROMPTED THE WARNING HAVE WEAKENED AND MOVED 
OUT OF THE AREA...AND NO LONGER POSE AN IMMEDIATE THREAT TO LIFE OR 
PROPERTY. THEREFORE...THE TORNADO WARNING HAS BEEN CANCELLED.

REPORT TORNADOES...WIND IN EXCESS OF 50 MPH...HAIL LARGER THAN ONE
HALF INCH...OR STORM DAMAGE BY CALLING LOCAL LAW ENFORCEMENT AND
ASKING THEM TO RELAY THE REPORT TO THE NATIONAL WEATHER SERVICE.

LAT...LON 4121 9371 4137 9336 4116 9335 4115 9340
      4113 9344 4104 9368 4116 9370
TIME...MOT...LOC 2213Z 254DEG 45KT 4123 9327

$$

BOKSA

The office that day

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

IssuedProductOfficeCountiesLasted
Oct 2, 7:42 AM CDTSevere Thunderstorm WarningDMXAudubon, Carroll, Cass, Guthrie33 min
Oct 2, 5:01 PM CDTSevere Thunderstorm WarningDMXJasper, Marshall, Polk, Poweshiek, Tama44 min
Oct 2, 5:54 PM CDTTornado WarningDMXMahaska, Marion, Monroe32 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.