Alert archive / Iowa / Tornado Warnings in 2011

Tornado Warning 13, NWS Des Moines, IA

March 22, 2011Madison County, Warren County, Iowa

NWS Des Moines, IA issued this tornado warning at Mar 22, 2011, 7:31 PM CDT for Madison County, Warren County, Iowa. It was in force for 29 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: Mar 22, 2011, 7:31 PM CDT (00:31 UTC)
Expired: Mar 22, 2011, 8:00 PM CDT
In force: 29 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon

Counties Madison County, IA, Warren County, IA

The radar

The Des Moines radar (KDMX), 32 km from the middle of the area, began a volume at 00:33 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
Mar 22, 7:41 PM CDT	HAIL 1.75	1 Wsw Cumming, IA	LOCATED ON I-35 NEAR MILE MARKER 65.
Mar 22, 7:45 PM CDT	FUNNEL CLOUD	Martensdale, 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
Mar 22, 2:03 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 0.5 hours before the alert went out and 224 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: 889 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: -149 m²/s²
0-3 km storm-relative helicity: -12 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.

008 
WFUS53 KDMX 230031
TORDMX
IAC121-181-230100-
/O.NEW.KDMX.TO.W.0013.110323T0031Z-110323T0100Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
731 PM CDT TUE MAR 22 2011

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHEASTERN MADISON COUNTY IN SOUTH CENTRAL IOWA...
  NORTHERN WARREN COUNTY IN SOUTH CENTRAL IOWA...

* UNTIL 800 PM CDT

* AT 728 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
  STORM WAS LOCATED NEAR WINTERSET...OR 19 MILES WEST OF INDIANOLA...
  AND MOVING EAST AT 45 MPH.

* LOCATIONS IMPACTED INCLUDE...
  INDIANOLA...NORWALK...CARLISLE...BEVINGTON...ST. MARYS...
  MARTENSDALE...CUMMING...SPRING HILL...ACKWORTH...HARTFORD AND
  SANDYVILLE.

THIS INCLUDES INTERSTATE 35 BETWEEN MILE MARKERS 53 AND 66.

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.

IN ADDITION TO THE TORNADO...THIS STORM IS ALSO EXPECTED TO PRODUCE 
GOLF BALL SIZE HAIL AND WIDESPREAD DESTRUCTIVE WINDS.

&&

LAT...LON 4149 9397 4151 9371 4151 9343 4149 9338
      4132 9333 4128 9402
TIME...MOT...LOC 0031Z 257DEG 37KT 4136 9389

$$

DONAVON

2 follow-up statements

162 
WWUS53 KDMX 230049
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
749 PM CDT TUE MAR 22 2011

IAC121-230059-
/O.CAN.KDMX.TO.W.0013.000000T0000Z-110323T0100Z/
MADISON IA-
749 PM CDT TUE MAR 22 2011

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

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED 
AREA.

LAT...LON 4130 9379 4150 9378 4151 9343 4150 9342
      4149 9338 4132 9333
TIME...MOT...LOC 0049Z 257DEG 37KT 4140 9365

$$

IAC181-230100-
/O.CON.KDMX.TO.W.0013.000000T0000Z-110323T0100Z/
WARREN IA-
749 PM CDT TUE MAR 22 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR NORTHERN WARREN COUNTY
UNTIL 800 PM CDT...

AT 746 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS DANGEROUS
STORM WAS LOCATED 7 MILES WEST OF INDIANOLA...MOVING EAST AT 45 MPH.

LOCATIONS IMPACTED INCLUDE...
  INDIANOLA...CARLISLE...ACKWORTH...HARTFORD AND SANDYVILLE.

THIS INCLUDES INTERSTATE 35 BETWEEN MILE MARKERS 54 AND 64.

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.

IN ADDITION TO THE TORNADO...THIS STORM IS ALSO EXPECTED TO PRODUCE 
GOLF BALL SIZE HAIL AND WIDESPREAD DESTRUCTIVE WINDS.

&&

LAT...LON 4130 9379 4150 9378 4151 9343 4150 9342
      4149 9338 4132 9333
TIME...MOT...LOC 0049Z 257DEG 37KT 4140 9365

$$

BEERENDS

130 
WWUS53 KDMX 230102
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
802 PM CDT TUE MAR 22 2011

IAC181-230112-
/O.EXP.KDMX.TO.W.0013.000000T0000Z-110323T0100Z/
WARREN IA-
802 PM CDT TUE MAR 22 2011

THIS INCLUDES INTERSTATE 35 BETWEEN MILE MARKERS 54 AND 64.

...THE TORNADO WARNING FOR NORTHERN WARREN COUNTY HAS EXPIRED...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.

ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A TORNADO 
WATCH REMAINS IN EFFECT UNTIL 9 PM CDT.

LAT...LON 4130 9379 4150 9378 4151 9343 4150 9342
      4149 9338 4132 9333
TIME...MOT...LOC 0049Z 257DEG 37KT 4140 9365

$$

BEERENDS

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 22, 7:01 PM CDT	Severe Thunderstorm Warning	DMX	Jasper, Marshall, Polk	44 min
Mar 22, 7:07 PM CDT	Severe Thunderstorm Warning	DMX	Adams, Ringgold, Taylor, Union	53 min
Mar 22, 7:09 PM CDT	Tornado Warning	DMX	Clarke, Decatur, Lucas, Wayne	36 min
Mar 22, 7:14 PM CDT	Severe Thunderstorm Warning	DMX	Dallas, Madison, Polk	31 min
Mar 22, 7:47 PM CDT	Severe Thunderstorm Warning	DMX	Jasper, Marshall, Poweshiek, Tama	43 min
Mar 22, 7:48 PM CDT	Severe Thunderstorm Warning	DMX	Clarke, Decatur, Ringgold, Union	42 min
Mar 22, 8:01 PM CDT	Severe Thunderstorm Warning	DMX	Madison, Marion, Warren	44 min
Mar 22, 8:09 PM CDT	Severe Thunderstorm Warning	DMX	Clarke, Lucas, Marion, Warren	51 min
Mar 22, 8:29 PM CDT	Severe Thunderstorm Warning	DMX	Clarke, Decatur, Lucas, Wayne	31 min
Mar 22, 8:41 PM CDT	Tornado Warning	DMX	Decatur, Lucas, Wayne	34 min
Mar 22, 8:42 PM CDT	Severe Thunderstorm Warning	DMX	Mahaska, Marion, Warren	33 min
Mar 22, 8:49 PM CDT	Severe Thunderstorm Warning	DMX	Jasper, Mahaska, Marion, Poweshiek	41 min
Mar 22, 8:58 PM CDT	Severe Thunderstorm Warning	DMX	Decatur, Wayne	17 min
Mar 22, 9:07 PM CDT	Severe Thunderstorm Warning	DMX	Mahaska, Marion	23 min
Mar 22, 9:12 PM CDT	Severe Thunderstorm Warning	DMX	Appanoose, Davis, Lucas, Monroe, Wapello, Wayne	48 min
Mar 22, 9:15 PM CDT	Tornado Warning	DMX	Mahaska, Poweshiek	30 min
Mar 22, 9:32 PM CDT	Severe Thunderstorm Warning	DMX	Mahaska, Monroe, Wapello	43 min
Mar 22, 9:55 PM CDT	Severe Thunderstorm Warning	DMX	Appanoose, Davis, Wapello	50 min
Mar 23, 1:59 PM CDT	River Flood Warning	DMX	Black Hawk, Bremer, Butler	68 hr

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.