Alert archive / Iowa / Tornado Warnings in 2011

Tornado Warning 55, NWS Des Moines, IA

July 23, 2011Appanoose County, Wayne County, Iowa

NWS Des Moines, IA issued this tornado warning at Jul 23, 2011, 6:47 PM CDT for Appanoose County, Wayne County, Iowa. It was in force for 17 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: Jul 23, 2011, 6:47 PM CDT (23:47 UTC)
Expired: Jul 23, 2011, 7:04 PM CDT
In force: 17 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon

Counties Appanoose County, IA, Wayne County, IA

The radar

The Des Moines radar (KDMX), 112 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.

What was reported inside it

Time	Report	Where	Remark
Jul 23, 6:49 PM CDT	TSTM WND DMG	8 N Promise City, IA	TREES DOWN NEAR THE TOWN OF CONFIDENCE
Jul 23, 6:49 PM CDT	TSTM WND GST 60	11 W Rathbun Lake, 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
Jul 23, 5:16 PM CDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 11.8 hours before the alert went out and 282 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: 1494 J/kg
Mixed-layer CIN: -247 J/kg
Mixed-layer LCL: 1815 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 135 m²/s²
0-3 km storm-relative helicity: 65 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.

296 
WFUS53 KDMX 232347
TORDMX
IAC007-185-240015-
/O.NEW.KDMX.TO.W.0055.110723T2347Z-110724T0015Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
647 PM CDT SAT JUL 23 2011

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHWESTERN APPANOOSE COUNTY IN SOUTH CENTRAL IOWA...
  NORTHEASTERN WAYNE COUNTY IN SOUTH CENTRAL IOWA...

* UNTIL 715 PM CDT

* AT 644 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
  STORM WAS LOCATED 14 MILES NORTH OF SEYMOUR...OR 16 MILES NORTHWEST
  OF CENTERVILLE...AND MOVING SOUTHEAST AT 15 MPH.

* LOCATIONS IMPACTED INCLUDE...
  RATHBUN LAKE AND PLANO.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IMMEDIATELY SEEK SHELTER IN A BASEMENT...
OR IN AN INTERIOR ROOM OF A REINFORCED BUILDING. STAY AWAY FROM
WINDOWS.

IF YOU ARE OUTSIDE...IN A MOBILE HOME...OR IN A VEHICLE...SEEK
SHELTER IN A NEARBY REINFORCED BUILDING. AS A LAST RESORT...FIND THE
LOWEST SPOT AVAILABLE AND COVER YOUR HEAD.

&&

LAT...LON 4085 9318 4090 9313 4090 9297 4088 9287
      4072 9308
TIME...MOT...LOC 2347Z 328DEG 14KT 4087 9310

$$

BEERENDS

2 follow-up statements

294 
WWUS53 KDMX 232359 RRA
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
659 PM CDT SAT JUL 23 2011

IAC007-185-240015-
/O.CON.KDMX.TO.W.0055.000000T0000Z-110724T0015Z/
WAYNE IA-APPANOOSE IA-
659 PM CDT SAT JUL 23 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR WEST CENTRAL APPANOOSE AND
EAST CENTRAL WAYNE COUNTIES UNTIL 715 PM CDT...

AT 658 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS DANGEROUS
STORM WAS LOCATED 10 MILES NORTH OF SEYMOUR...OR 12 MILES NORTHWEST
OF CENTERVILLE...MOVING SOUTHEAST AT 15 MPH.

LOCATIONS IMPACTED INCLUDE...
  PLANO.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IMMEDIATELY SEEK SHELTER IN A BASEMENT...
OR IN AN INTERIOR ROOM OF A REINFORCED BUILDING. STAY AWAY FROM
WINDOWS.

IF YOU ARE OUTSIDE...IN A MOBILE HOME...OR IN A VEHICLE...SEEK
SHELTER IN A NEARBY REINFORCED BUILDING. AS A LAST RESORT...FIND THE
LOWEST SPOT AVAILABLE AND COVER YOUR HEAD.

&&

LAT...LON 4082 9316 4086 9310 4086 9300 4081 9296
      4072 9308
TIME...MOT...LOC 0000Z 328DEG 14KT 4082 9306

$$

BEERENDS

928 
WWUS53 KDMX 240004
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
704 PM CDT SAT JUL 23 2011

IAC007-185-240014-
/O.CAN.KDMX.TO.W.0055.000000T0000Z-110724T0015Z/
WAYNE IA-APPANOOSE IA-
704 PM CDT SAT JUL 23 2011

...THE TORNADO WARNING FOR WEST CENTRAL APPANOOSE AND EAST CENTRAL
WAYNE COUNTIES IS CANCELLED...

THE TORNADO THREAT HAS DIMINISHED...THEREFORE THE TORNADO WARNING HAS
BEEN CANCELLED. HOWEVER...A SEVERE THUNDERSTORM WARNING REMAINS IN 
EFFECT FOR THE AREA UNTIL 730 PM CDT FOR 60 MPH WINDS.  

LAT...LON 4082 9316 4086 9310 4086 9300 4081 9296
      4072 9308
TIME...MOT...LOC 0004Z 328DEG 14KT 4081 9305

$$

BEERENDS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 22, 7:29 PM CDT	Severe Thunderstorm Warning	DMX	Black Hawk, Grundy	46 min
Jul 22, 7:54 PM CDT	Severe Thunderstorm Warning	DMX	Grundy, Marshall, Tama	66 min
Jul 22, 8:02 PM CDT	Severe Thunderstorm Warning	DMX	Jasper, Mahaska, Marion	43 min
Jul 22, 8:33 PM CDT	Severe Thunderstorm Warning	DMX	Jasper, Poweshiek	42 min
Jul 22, 8:47 PM CDT	Severe Thunderstorm Warning	DMX	Jasper, Mahaska, Marion	43 min
Jul 22, 9:08 PM CDT	Severe Thunderstorm Warning	DMX	Poweshiek, Tama	50 min
Jul 22, 10:17 PM CDT	Severe Thunderstorm Warning	DMX	Jasper, Mahaska, Poweshiek	43 min
Jul 23, 5:43 PM CDT	Severe Thunderstorm Warning	DMX	Lucas, Monroe	47 min
Jul 23, 6:15 PM CDT	Severe Thunderstorm Warning	DMX	Appanoose, Lucas, Monroe, Wayne	45 min
Jul 23, 6:34 PM CDT	Tornado Warning	DMX	Appanoose, Lucas, Monroe, Wayne	26 min
Jul 23, 6:42 PM CDT	Severe Thunderstorm Warning	DMX	Appanoose, Lucas, Monroe, Wayne	48 min

Nearby

Tornado Warnings in Iowa, 2011 Every tornado warning in 2011 Tornadoes in 2011

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.