Alert archive / Iowa / Tornado Warnings in 2007

Tornado Warning 50, NWS Des Moines, IA

September 30, 20074 counties in Iowa

NWS Des Moines, IA issued this tornado warning at Sep 30, 2007, 6:21 PM CDT for 4 counties in Iowa. It was in force for 39 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: Sep 30, 2007, 6:21 PM CDT (23:21 UTC)
Expired: Sep 30, 2007, 7:00 PM CDT
In force: 39 min
Issued by: NWS Des Moines, IA
Area: Counties, with a storm outline in the text

Counties Jasper County, IA, Mahaska County, IA, Marion County, IA, Poweshiek County, IA

The radar

The Des Moines radar (KDMX), 99 km from the middle of the area, began a volume at 23:21 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, 6:26 PM CDT	TORNADO	4 S Sully, IA	TORNADO TOUCHDOWN 4 MILES SOUTH OF SULLY. 7 TO 8 MILE DAMAGE PATH REPORTED JUST SOUTH OF SULLY TO NORTH LYNNVILLE.
Sep 30, 6:30 PM CDT	TORNADO	5 Sw Lynnville, IA	REPORTED DAMAGE TO A HOME NEAR LYNVILLE. NEAR COUNTY LINE ROAD AND HIGHWAY T33.
Sep 30, 6:42 PM CDT	TORNADO	5 Sse Grinnell Airport, IA	TORNADO DAMAGE TO MACHINE SHED.
Sep 30, 6:51 PM CDT	TORNADO	1 W Malcom, IA	TORNADO REPORT ALONG INTERSTATE 80 AT MILE MARKER 190...REPORTED BY 4 SEPERATE PUBLIC CALLS TO POWESHIEK SHERIFF.

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, 11.4 hours before the alert went out and 170 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 302321 RRA
TORDMX
IAC099-123-125-157-010000-
/O.NEW.KDMX.TO.W.0050.070930T2321Z-071001T0000Z/

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

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHEASTERN JASPER COUNTY IN CENTRAL IOWA...
  POWESHIEK COUNTY IN CENTRAL IOWA...
  NORTHWESTERN MAHASKA COUNTY IN SOUTH CENTRAL IOWA...
  NORTHEASTERN MARION COUNTY IN SOUTH CENTRAL IOWA...

* UNTIL 700 PM CDT.

* AT 616 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 13 MILES WEST OF
  NEW SHARON...OR ABOUT 37 MILES WEST OF SIGOURNEY...MOVING NORTHEAST
  AT 50 MPH.

* THE TORNADO WILL BE NEAR...
  NEW SHARON BY 630 PM CDT...
  MONTEZUMA BY 640 PM CDT...
  BROOKLYN BY 650 PM CDT...

THIS INCLUDES INTERSTATE 80 BETWEEN MILE MARKERS 185 AND 204.

THIS TORNADO WARNING REPLACES THE SEVERE THUNDERSTORM WARNING THAT
WAS IN EFFECT FOR THE SAME AREA. GO TO A BASEMENT OR SMALL INTERIOR
ROOM ON THE LOWEST FLOOR

IN ADDITION TO THE TORNADO...THIS STORM IS ALSO EXPECTED TO PRODUCE 
PENNY 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 4153 9302 4187 9230 4186 9229 4178 9229
      4177 9228 4157 9229 4131 9283
TIME...MOT...LOC 2321Z 238DEG 44KT 4148 9283

$$

SMALL

4 follow-up statements

000 
WWUS53 KDMX 302326
SVSDMX

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

IAC125-302336-
/O.CAN.KDMX.TO.W.0050.000000T0000Z-071001T0000Z/
MARION IA-
626 PM CDT SUN SEP 30 2007

...THE TORNADO WARNING FOR NORTHEASTERN MARION COUNTY IS CANCELLED...

AT 625 PM CDT...WEATHER SERVICE DOPPLER RADAR INDICATED THAT THE
THUNDERSTORMS WHICH PROMPTED THE WARNING HAVE EITHER WEAKENED OR
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 4150 9287 4151 9296 4155 9299 4187 9230
      4186 9229 4178 9229 4177 9228 4163 9230
      4139 9286
TIME...MOT...LOC 2326Z 230DEG 42KT 4153 9280

$$

IAC099-123-157-010000-
/O.CON.KDMX.TO.W.0050.000000T0000Z-071001T0000Z/
JASPER IA-POWESHIEK IA-MAHASKA IA-
626 PM CDT SUN SEP 30 2007

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 700 PM CDT FOR
NORTHWESTERN MAHASKA...POWESHIEK AND SOUTHEASTERN JASPER COUNTIES...

AT 625 PM CDT...WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A
SEVERE THUNDERSTORM WITH STRONG ROTATION.  THIS TORNADO WAS LOCATED
NEAR LYNNVILLE...OR ABOUT 34 MILES WEST OF SIGOURNEY...MOVING
NORTHEAST AT 45 MPH.

THE TORNADO WILL BE NEAR...
  SEARSBORO BY 635 PM CDT...
  6 MILES NORTHWEST OF MONTEZUMA BY 640 PM CDT...
  MALCOM BY 650 PM CDT...
  BROOKLYN AND 9 MILES NORTHWEST OF GUERNSEY BY 655 PM CDT...
  HARTWICK BY 700 PM CDT...

THIS INCLUDES INTERSTATE 80 BETWEEN MILE MARKERS 185 AND 204.

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.

LAT...LON 4150 9287 4151 9296 4155 9299 4187 9230
      4186 9229 4178 9229 4177 9228 4163 9230
      4139 9286
TIME...MOT...LOC 2326Z 230DEG 42KT 4153 9280

$$

SMALL

000 
WWUS53 KDMX 302328
SVSDMX

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

IAC099-123-157-010000-
/O.CON.KDMX.TO.W.0050.000000T0000Z-071001T0000Z/
JASPER IA-POWESHIEK IA-MAHASKA IA-
629 PM CDT SUN SEP 30 2007

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 700 PM CDT FOR
NORTHWESTERN MAHASKA...POWESHIEK AND SOUTHEASTERN JASPER COUNTIES...

AT 627 PM CDT...TRAINED WEATHER SPOTTERS REPORTED A FUNNEL CLOUD. 
THIS TORNADO WAS LOCATED NEAR LYNNVILLE...OR ABOUT 34 MILES WEST OF
SIGOURNEY...MOVING NORTHEAST AT 45 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
SEARSBORO...MONTEZUMA...MALCOM...BROOKLYN...GUERNSEY AND HARTWICK

THIS INCLUDES INTERSTATE 80 BETWEEN MILE MARKERS 185 AND 204.

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.

LAT...LON 4150 9287 4151 9296 4155 9299 4187 9230
      4186 9229 4178 9229 4177 9228 4163 9230
      4139 9286
TIME...MOT...LOC 2329Z 230DEG 42KT 4155 9276

$$

SMALL

000 
WWUS53 KDMX 302333 RRA
SVSDMX

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

IAC123-302342-
/O.CAN.KDMX.TO.W.0050.000000T0000Z-071001T0000Z/
MAHASKA IA-
632 PM CDT SUN SEP 30 2007

...THE TORNADO WARNING FOR NORTHWESTERN MAHASKA COUNTY IS
CANCELLED...

AT 629 PM CDT...WEATHER SERVICE DOPPLER RADAR INDICATED THAT THE
THUNDERSTORMS WHICH PROMPTED THE WARNING HAVE EITHER WEAKENED OR
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 4155 9299 4187 9230 4186 9229 4178 9229
      4177 9228 4163 9230 4151 9258 4152 9279
      4151 9280 4151 9296
TIME...MOT...LOC 2332Z 226DEG 41KT 4158 9275

$$

IAC099-157-010000-
/O.CON.KDMX.TO.W.0050.000000T0000Z-071001T0000Z/
JASPER IA-POWESHIEK IA-
632 PM CDT SUN SEP 30 2007

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 700 PM CDT FOR POWESHIEK
AND SOUTHEASTERN JASPER COUNTIES...

AT 629 PM CDT...WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A
SEVERE THUNDERSTORM WITH STRONG ROTATION.  THIS TORNADO WAS LOCATED
NEAR LYNNVILLE...OR ABOUT 33 MILES NORTHWEST OF SIGOURNEY...MOVING
NORTHEAST AT 45 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
SEARSBORO...MONTEZUMA...MALCOM...GUERNSEY...BROOKLYN AND HARTWICK

THIS INCLUDES INTERSTATE 80 BETWEEN MILE MARKERS 185 AND 204.

HEAVY RAINFALL MAY OBSCURE THIS TORNADO. TAKE COVER NOW IF YOU WAIT
TO SEE OR HEAR IT COMING...IT MAY BE TOO LATE TO GET TO A SAFE PLACE.

THIS STORM PRODUCED A FUNNEL CLOUD AT 627 PM CDT SOUTHWEST OF 
LYNNVILLE. 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 4155 9299 4187 9230 4186 9229 4178 9229
      4177 9228 4163 9230 4151 9258 4152 9279
      4151 9280 4151 9296
TIME...MOT...LOC 2332Z 226DEG 41KT 4158 9275

$$

SMALL

000 
WWUS53 KDMX 302346
SVSDMX

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

IAC099-302355-
/O.CAN.KDMX.TO.W.0050.000000T0000Z-071001T0000Z/
JASPER IA-
645 PM CDT SUN SEP 30 2007

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

AT 642 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 4161 9277 4165 9277 4182 9240 4168 9240
      4160 9257 4159 9276
TIME...MOT...LOC 2345Z 226DEG 39KT 4167 9262

$$

IAC157-010000-
/O.CON.KDMX.TO.W.0050.000000T0000Z-071001T0000Z/
POWESHIEK IA-
645 PM CDT SUN SEP 30 2007

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 700 PM CDT FOR CENTRAL
POWESHIEK COUNTY...

AT 642 PM CDT...LOCAL LAW ENFORCEMENT REPORTED A TORNADO.  THIS
TORNADO WAS LOCATED 6 MILES SOUTHWEST OF MALCOM...OR ABOUT 32 MILES
WEST OF MARENGO...MOVING NORTHEAST AT 45 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
BROOKLYN

THIS INCLUDES INTERSTATE 80 BETWEEN MILE MARKERS 185 AND 199.

HEAVY RAINFALL MAY OBSCURE THIS TORNADO. TAKE COVER NOW IF YOU WAIT
TO SEE OR HEAR IT COMING...IT MAY BE TOO LATE TO GET TO A SAFE PLACE.

A TORNADO WAS REPORTED IN 4 MILES SOUTH OF SULLY AT 626 PM CDT. 

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 4161 9277 4165 9277 4182 9240 4168 9240
      4160 9257 4159 9276
TIME...MOT...LOC 2345Z 226DEG 39KT 4167 9262

$$

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, 5:33 PM CDT	Tornado Warning	DMX	Marion, Warren	42 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, 6:37 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.