Alert archive / Iowa / Tornado Warnings in 2007

Tornado Warning 47, NWS Des Moines, IA

September 30, 2007Marion County, Warren County, Iowa

NWS Des Moines, IA issued this tornado warning at Sep 30, 2007, 5:33 PM CDT for Marion County, Warren County, Iowa. It was in force for 42 min. 2 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: Sep 30, 2007, 5:33 PM CDT (22:33 UTC)
Expired: Sep 30, 2007, 6:15 PM CDT
In force: 42 min
Issued by: NWS Des Moines, IA
Area: Counties, with a storm outline in the text

Counties Marion County, IA, Warren County, IA

The radar

The Des Moines radar (KDMX), 61 km from the middle of the area, began a volume at 22:35 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
Sep 30, 5:46 PM CDT	TSTM WND DMG	4 W Melcher-Dallas, IA	6 INCH DIAMETER TREE LIMBS DOWN WEST OF MELCHER-DALLAS.
Sep 30, 6:00 PM CDT	HAIL 1	2 S Pleasantville, IA

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
Sep 30, 1:02 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 10.6 hours before the alert went out and 232 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1947 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 154 m²/s²
0-3 km storm-relative helicity: 128 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 
WFUS53 KDMX 302233
TORDMX
IAC125-181-302315-
/O.NEW.KDMX.TO.W.0047.070930T2233Z-070930T2315Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
533 PM CDT SUN SEP 30 2007

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHWESTERN MARION COUNTY IN SOUTH CENTRAL IOWA...
  SOUTHEASTERN WARREN COUNTY IN SOUTH CENTRAL IOWA...

* UNTIL 615 PM CDT.

* AT 531 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 19 MILES
  SOUTHWEST OF PLEASANTVILLE...OR ABOUT 31 MILES SOUTH OF DES
  MOINES...MOVING NORTHEAST AT 45 MPH.

* THE TORNADO WILL BE NEAR...
  PLEASANTVILLE AND 6 MILES NORTHWEST OF KNOXVILLE BY 555 PM CDT...

IN ADDITION TO THE TORNADO...THIS STORM IS ALSO EXPECTED TO PRODUCE
QUARTER SIZE HAIL AND DESTRUCTIVE STRAIGHT LINE WINDS.

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.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 800 PM CDT SUNDAY EVENING FOR
WESTERN IOWA.

LAT...LON 4151 9332 4151 9286 4116 9323 4115 9326
      4116 9327 4116 9354
TIME...MOT...LOC 2233Z 219DEG 43KT 4116 9342

$$

SMALL

1 follow-up statement

000 
WWUS53 KDMX 302248
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
548 PM CDT SUN SEP 30 2007

IAC181-302258-
/O.CAN.KDMX.TO.W.0047.000000T0000Z-070930T2315Z/
WARREN IA-
548 PM CDT SUN SEP 30 2007

...THE TORNADO WARNING FOR SOUTHEASTERN WARREN COUNTY IS CANCELLED...

AT 545 PM CDT...WEATHER SERVICE DOPPLER RADAR INDICATED THAT THE 
THUNDERSTORMS WHICH PROMPTED THE WARNING HAVE 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.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 800 PM CDT SUNDAY EVENING FOR
WESTERN IOWA.

LAT...LON 4148 9334 4151 9332 4151 9286 4116 9323
      4115 9325 4116 9326 4116 9334
TIME...MOT...LOC 2248Z 226DEG 46KT 4123 9327

$$

IAC125-302315-
/O.CON.KDMX.TO.W.0047.000000T0000Z-070930T2315Z/
MARION IA-
548 PM CDT SUN SEP 30 2007

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 615 PM CDT FOR
NORTHWESTERN MARION COUNTY...

AT 545 PM CDT...WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A
SEVERE THUNDERSTORM WITH STRONG ROTATION.  THIS TORNADO WAS LOCATED
NEAR MELCHER-DALLAS...OR ABOUT 31 MILES SOUTHEAST OF DES MOINES...
MOVING NORTHEAST AT 50 MPH.

THE TORNADO WILL BE NEAR...
  8 MILES SOUTHEAST OF PLEASANTVILLE BY 555 PM CDT...
  KNOXVILLE AND KNOXVILLE AIRPORT BY 600 PM CDT...

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.

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.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 800 PM CDT SUNDAY EVENING FOR
WESTERN IOWA.

LAT...LON 4148 9334 4151 9332 4151 9286 4116 9323
      4115 9325 4116 9326 4116 9334
TIME...MOT...LOC 2248Z 226DEG 46KT 4123 9327

$$

SMALL

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 30, 4:29 PM CDT	Severe Thunderstorm Warning	DMX	Ringgold	31 min
Sep 30, 4:38 PM CDT	Severe Thunderstorm Warning	DMX	Union	27 min
Sep 30, 4:43 PM CDT	High Wind Warning	DMX	Adair, Adams, Audubon, Carroll, Cass, Clarke and 8 more	3 hr
Sep 30, 4:49 PM CDT	Severe Thunderstorm Warning	DMX	Clarke, Madison, Warren	56 min
Sep 30, 5:21 PM CDT	Severe Thunderstorm Warning	DMX	Clarke, Lucas	24 min
Sep 30, 5:23 PM CDT	Tornado Warning	DMX	Clarke, Lucas	24 min
Sep 30, 5:25 PM CDT	Severe Thunderstorm Warning	DMX	Sac	50 min
Sep 30, 6:03 PM CDT	Severe Thunderstorm Warning	DMX	Jasper	57 min
Sep 30, 6:03 PM CDT	Tornado Warning	DMX	Sac	15 min
Sep 30, 6:17 PM CDT	Severe Thunderstorm Warning	DMX	Calhoun, Pocahontas, Sac	43 min
Sep 30, 6:18 PM CDT	Severe Thunderstorm Warning	DMX	Mahaska, Marion, Poweshiek	42 min
Sep 30, 6:21 PM CDT	Tornado Warning	DMX	Calhoun, Pocahontas, Sac	24 min
Sep 30, 6:21 PM CDT	Tornado Warning	DMX	Jasper, Mahaska, Marion, Poweshiek	39 min
Sep 30, 6:37 PM CDT	Tornado Warning	DMX	Poweshiek	38 min
Sep 30, 6:47 PM CDT	Tornado Warning	DMX	Calhoun, Pocahontas	15 min
Sep 30, 6:54 PM CDT	Tornado Warning	DMX	Jasper, Mahaska, Marion, Poweshiek	26 min

Nearby

Tornado Warnings in Iowa, 2007 Every tornado warning in 2007 Tornadoes 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.