Alert archive / Iowa / Tornado Warnings in 2011

Tornado Warning 5, NWS Des Moines, IA

March 22, 20114 counties in Iowa

NWS Des Moines, IA issued this tornado warning at Mar 22, 2011, 5:43 PM CDT for 4 counties in Iowa. It was in force for 15 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Mar 22, 2011, 5:43 PM CDT (22:43 UTC)
Expired: Mar 22, 2011, 5:58 PM CDT
In force: 15 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon

Counties Audubon County, IA, Cass County, IA, Greene County, IA, Guthrie County, IA

The radar

The Des Moines radar (KDMX), 69 km from the middle of the area, began a volume at 22:43 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.

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 12:00Z, 10.7 hours before the alert went out and 158 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: 486 J/kg
Mixed-layer CIN: -475 J/kg
Mixed-layer LCL: 777 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 477 m²/s²
0-3 km storm-relative helicity: 501 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.

950 
WFUS53 KDMX 222243
TORDMX
IAC009-029-073-077-222330-
/O.NEW.KDMX.TO.W.0005.110322T2243Z-110322T2330Z/

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

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHEASTERN AUDUBON COUNTY IN WEST CENTRAL IOWA...
  NORTHEASTERN CASS COUNTY IN SOUTHWEST IOWA...
  SOUTHERN GREENE COUNTY IN WEST CENTRAL IOWA...
  GUTHRIE COUNTY IN WEST CENTRAL IOWA...

* UNTIL 630 PM CDT

* AT 539 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
  STORM WAS LOCATED 13 MILES NORTHEAST OF ATLANTIC...AND MOVING
  NORTHEAST AT 40 MPH.

* LOCATIONS IMPACTED INCLUDE...
  GUTHRIE CENTER...BAYARD...YALE...BAGLEY AND JAMAICA.

THIS INCLUDES INTERSTATE 80 BETWEEN MILE MARKERS 66 AND 72.

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 4186 9468 4186 9463 4190 9464 4206 9445
      4191 9419 4186 9423 4186 9429 4180 9428
      4151 9455 4151 9470 4147 9471 4145 9483
      4164 9493
TIME...MOT...LOC 2243Z 217DEG 36KT 4153 9478

$$

JOHNSON

1 follow-up statement

644 
WWUS53 KDMX 222258 RRA
SVSDMX

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

IAC009-029-073-077-222308-
/O.CAN.KDMX.TO.W.0005.000000T0000Z-110322T2330Z/
CASS IA-GREENE IA-GUTHRIE IA-AUDUBON IA-
558 PM CDT TUE MAR 22 2011

THIS INCLUDES INTERSTATE 80 BETWEEN MILE MARKERS 66 AND 72.

...THE TORNADO WARNING FOR SOUTHEASTERN AUDUBON...GUTHRIE...SOUTHERN
GREENE AND NORTHEASTERN CASS COUNTIES IS CANCELLED...

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

LAT...LON 4186 9468 4186 9463 4190 9464 4206 9445
      4191 9419 4186 9423 4186 9429 4180 9428
      4151 9455 4151 9470 4147 9471 4145 9483
      4164 9493
TIME...MOT...LOC 2258Z 217DEG 36KT 4165 9466

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 22, 6:30 AM CDT	River Flood Warning	DMX	Black Hawk, Bremer, Butler	4 days
Mar 22, 10:52 AM CDT	River Flood Warning	DMX	Palo Alto	16 days
Mar 22, 10:52 AM CDT	River Flood Warning	DMX	Humboldt	25 days
Mar 22, 4:34 PM CDT	Severe Thunderstorm Warning	DMX	Hancock, Humboldt, Kossuth, Wright	13 min
Mar 22, 4:55 PM CDT	Tornado Warning	DMX	Carroll, Crawford	35 min
Mar 22, 5:02 PM CDT	Tornado Warning	DMX	Adair, Adams, Cass	43 min
Mar 22, 5:07 PM CDT	Severe Thunderstorm Warning	DMX	Audubon, Cass, Guthrie	23 min
Mar 22, 5:18 PM CDT	Tornado Warning	DMX	Audubon, Cass, Guthrie	27 min
Mar 22, 5:27 PM CDT	Severe Thunderstorm Warning	DMX	Audubon, Carroll, Greene	33 min
Mar 22, 5:29 PM CDT	Tornado Warning	DMX	Crawford	35 min
Mar 22, 5:44 PM CDT	Tornado Warning	DMX	Adair, Madison	46 min
Mar 22, 5:47 PM CDT	Tornado Warning	DMX	Adams, Ringgold, Taylor, Union	43 min
Mar 22, 6:16 PM CDT	Severe Thunderstorm Warning	DMX	Dallas, Madison, Polk	44 min
Mar 22, 6:26 PM CDT	Tornado Warning	DMX	Dallas, Madison, Polk, Warren	49 min
Mar 22, 6:27 PM CDT	Tornado Warning	DMX	Adair, Clarke, Madison, Union, Warren	39 min
Mar 22, 6:32 PM CDT	Severe Thunderstorm Warning	DMX	Cerro Gordo, Hancock, Worth, Wright	28 min
Mar 22, 6:45 PM CDT	Tornado Warning	DMX	Clarke, Decatur, Ringgold	30 min
Mar 22, 6:50 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Dallas, Madison	25 min
Mar 22, 6:57 PM CDT	Tornado Warning	DMX	Adair, Madison, Union	33 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.