Alert archive / Iowa / Tornado Warnings in 2009

Tornado Warning 7, NWS Des Moines, IA

June 17, 2009Clarke County, Madison County, Warren County, Iowa

NWS Des Moines, IA issued this tornado warning at Jun 17, 2009, 11:55 PM CDT for Clarke County, Madison County, Warren County, Iowa. It was in force for 35 min. 6 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: Jun 17, 2009, 11:55 PM CDT (04:55 UTC)
Expired: Jun 18, 2009, 12:30 AM CDT
In force: 35 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon

Counties Clarke County, IA, Madison County, IA, Warren County, IA

The radar

The Des Moines radar (KDMX), 67 km from the middle of the area, began a volume at 04:55 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
Jun 18, 12:05 AM CDT	TSTM WND DMG	1 Se East Peru, IA	SEVERAL LARGE TREE BRANCHES DOWN AT INTERSECTION OF G68 AND R21. TIME ESTIMATED.
Jun 18, 12:10 AM CDT	TSTM WND DMG	1 Se East Peru, IA	MADISON COUNTY LAW ENFORCEMENT REPORTED TREES BLOWN DOWN OVER THE ROAD AT 3010 RUSTIC AVENUE
Jun 18, 12:10 AM CDT	TSTM WND GST 65	1 Nw East Peru, IA	MADISON COUNTY LAW ENFORCEMENT REPORTED ESTIMATED 65 MPH WIND GUSTS JUST NORTHWEST OF EAST PERU
Jun 18, 12:10 AM CDT	HAIL 1.75	1 Nw East Peru, IA	MADISON COUNTY LAW ENFORCEMENT REPORTED GOLF BALL HAIL JUST NORTHWEST OF EAST PERU
Jun 18, 12:16 AM CDT	FUNNEL CLOUD	4 Wsw East Peru, IA	MADISON COUNTY LAW ENFORCEMENT REPORTED A FUNNEL CLOUD NEAR THE INTERSECTION OF MILLSTREAM AVENUE AND 305TH STREET
Jun 18, 12:25 AM CDT	HAIL 1.75	Truro, IA	AMATEUR RADIO OPERATOR REPORTED GOLF BALL SIZED HAIL IN TRURO

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
Jun 17, 6:21 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 17, 11:53 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 4.9 hours before the alert went out and 202 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: 1256 J/kg
Mixed-layer CIN: -128 J/kg
Mixed-layer LCL: 1892 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 54 m²/s²
0-3 km storm-relative helicity: 169 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.0

Open this sounding in Storm Lab

The text

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

000 
WFUS53 KDMX 180455
TORDMX
IAC039-121-181-180530-
/O.NEW.KDMX.TO.W.0007.090618T0455Z-090618T0530Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
1155 PM CDT WED JUN 17 2009

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHERN CLARKE COUNTY IN SOUTH CENTRAL IOWA...
  SOUTHERN MADISON COUNTY IN SOUTH CENTRAL IOWA...
  SOUTHWESTERN WARREN COUNTY IN SOUTH CENTRAL IOWA...

* UNTIL 1230 AM CDT

* AT 1155 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
  STORM WAS LOCATED 7 MILES SOUTH OF WINTERSET...OR 32 MILES
  SOUTHWEST OF DES MOINES...AND MOVING SOUTHEAST AT 25 MPH.

* THIS TORNADIC STORM WILL BE NEAR...
  EAST PERU BY 1210 AM CDT...
  TRURO BY 1220 AM CDT...
  NEW VIRGINIA AND OSCEOLA BY 1230 AM CDT...

THIS INCLUDES INTERSTATE 35 BETWEEN MILE MARKERS 33 AND 49.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 4112 9402 4116 9402 4116 9411 4119 9418
      4135 9408 4119 9356 4097 9370
TIME...MOT...LOC 0455Z 298DEG 23KT 4124 9404

$$

DONAVON

1 follow-up statement

000 
WWUS53 KDMX 180519
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
1219 AM CDT THU JUN 18 2009

IAC039-121-181-180530-
/O.CON.KDMX.TO.W.0007.000000T0000Z-090618T0530Z/
CLARKE IA-MADISON IA-WARREN IA-
1219 AM CDT THU JUN 18 2009

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1230 AM CDT FOR
SOUTHWESTERN WARREN...SOUTHEASTERN MADISON AND NORTHERN CLARKE
COUNTIES...

AT 1216 AM CDT...LAW ENFORCEMENT REPORTED A FUNNEL CLOUD SOUTHWEST 
OF EAST PERU. THE STORM WAS LOCATED NEAR TRURO...MOVING SOUTHEAST AT 
25 MPH.

THE TORNADO WILL BE NEAR...
  NEW VIRGINIA AND OSCEOLA BY 1230 AM CDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 4112 9402 4116 9402 4130 9395 4119 9356
      4097 9370
TIME...MOT...LOC 0519Z 298DEG 23KT 4117 9386

$$

KINNEY

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 17, 9:30 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Audubon, Cass, Guthrie	45 min
Jun 17, 10:04 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Madison, Union	41 min
Jun 17, 10:15 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Audubon, Cass, Guthrie	45 min
Jun 17, 10:38 PM CDT	Severe Thunderstorm Warning	DMX	Dallas, Madison, Polk, Warren	37 min
Jun 17, 10:43 PM CDT	Severe Thunderstorm Warning	DMX	Crawford	32 min
Jun 17, 10:46 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Madison	44 min
Jun 17, 10:59 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Dallas, Guthrie, Madison	46 min
Jun 17, 11:07 PM CDT	Severe Thunderstorm Warning	DMX	Jasper	41 min
Jun 17, 11:14 PM CDT	Severe Thunderstorm Warning	DMX	Carroll, Crawford, Sac	46 min
Jun 17, 11:27 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Dallas, Madison	48 min
Jun 18, 12:00 AM CDT	Severe Thunderstorm Warning	DMX	Calhoun, Carroll, Crawford, Sac	45 min
Jun 18, 12:12 AM CDT	Severe Thunderstorm Warning	DMX	Clarke, Lucas, Madison, Warren	48 min
Jun 18, 12:17 AM CDT	Severe Thunderstorm Warning	DMX	Crawford, Sac	37 min
Jun 18, 12:21 AM CDT	Areal Flood Advisory	DMX	Calhoun, Carroll, Crawford, Sac	3 hr
Jun 18, 12:31 AM CDT	Severe Thunderstorm Warning	DMX	Clarke, Lucas	29 min
Jun 18, 12:35 AM CDT	Severe Thunderstorm Warning	DMX	Lucas, Marion, Monroe, Warren, Wayne	40 min
Jun 18, 12:43 AM CDT	Severe Thunderstorm Warning	DMX	Calhoun, Carroll, Greene, Guthrie, Sac	47 min
Jun 18, 12:59 AM CDT	Tornado Warning	DMX	Lucas, Wayne	31 min
Jun 18, 1:18 AM CDT	Severe Thunderstorm Warning	DMX	Lucas, Mahaska, Marion, Monroe, Wapello	42 min
Jun 18, 1:41 AM CDT	Severe Thunderstorm Warning	DMX	Boone, Dallas, Polk, Story	49 min
Jun 18, 1:44 AM CDT	Severe Thunderstorm Warning	DMX	Marion, Warren	46 min
Jun 18, 2:07 AM CDT	Severe Thunderstorm Warning	DMX	Polk, Warren	23 min
Jun 18, 2:11 AM CDT	Severe Thunderstorm Warning	DMX	Jasper, Marion	39 min
Jun 18, 2:24 AM CDT	Severe Thunderstorm Warning	DMX	Monroe, Wapello	51 min
Jun 18, 2:32 AM CDT	Severe Thunderstorm Warning	DMX	Lucas, Marion, Monroe, Warren	28 min
Jun 18, 5:54 AM CDT	River Flood Warning	DMX	Mahaska, Marion	5 days
Jun 18, 7:24 AM CDT	Severe Thunderstorm Warning	DMX	Calhoun, Humboldt, Pocahontas, Webster	36 min
Jun 18, 7:34 AM CDT	Severe Thunderstorm Warning	DMX	Calhoun, Sac, Webster	41 min
Jun 18, 7:39 AM CDT	Severe Thunderstorm Warning	DMX	Humboldt, Kossuth, Palo Alto, Pocahontas	36 min
Jun 18, 8:03 AM CDT	Severe Thunderstorm Warning	DMX	Hamilton, Humboldt, Webster, Wright	42 min
Jun 18, 9:05 AM CDT	Severe Thunderstorm Warning	DMX	Grundy, Hardin, Marshall, Story	25 min
Jun 18, 10:49 AM CDT	River Flood Warning	DMX	Mahaska, Marion	10 hr
Jun 18, 12:35 PM CDT	River Flood Warning	DMX	Wapello	11 hr
Jun 18, 1:34 PM CDT	River Flood Warning	DMX	Wapello	5 hr

Nearby

Tornado Warnings in Iowa, 2009 Every tornado warning in 2009 Tornadoes in 2009

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.