Alert archive / Iowa / Tornado Warnings in 2011

Tornado Warning 49, NWS Des Moines, IA

June 21, 2011Tama County, Iowa

NWS Des Moines, IA issued this tornado warning at Jun 21, 2011, 1:04 AM CDT for Tama County, Iowa. It was in force for 27 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: Jun 21, 2011, 1:04 AM CDT (06:04 UTC)
Expired: Jun 21, 2011, 1:31 AM CDT
In force: 27 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon

County Tama County, IA

The radar

The Des Moines radar (KDMX), 112 km from the middle of the area, began a volume at 06:06 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 21, 1:15 AM CDT	TSTM WND DMG	1 Ne Clutier, IA	FARM SITE ON HIGHWAY V18 WITH LARGE TREES DOWN. MINOR DAMAGE TO HOUSE WITH GUTTER BLOWN INTO TRUCK. ROOF OFF OUTBUILDING. IN CLUTIER NUMEROUS LARGE TREE LIMBS ALSO DOWN.
Jun 21, 1:15 AM CDT	TORNADO 0	1 Ne Clutier, IA	FARM SITE ON HIGHWAY V18 WITH TOPS OF LARGE TREES SNAPPED OFF. MINOR DAMAGE TO HOUSE WITH GUTTER BLOWN INTO TRUCK. ROOF OFF OUTBUILDING. NARROW DAMAGE PATH WAS VERY LOCALIZED. WINDS SPEEDS ESTIMATED NEAR 85 MPH. IN CLUTIER NUMEROUS LARGE TREE LIMBS ALSO DOWN.

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 20, 10:58 PM CDT	Tornado Watch	SPC	4 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 6.1 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: 2585 J/kg
Mixed-layer CIN: -110 J/kg
Mixed-layer LCL: 699 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 184 m²/s²
0-3 km storm-relative helicity: 218 m²/s²
Significant tornado parameter: 1.0
Supercell composite: 12.8

Open this sounding in Storm Lab

The text

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

981 
WFUS53 KDMX 210604
TORDMX
IAC171-210700-
/O.NEW.KDMX.TO.W.0049.110621T0604Z-110621T0700Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
104 AM CDT TUE JUN 21 2011

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* TORNADO WARNING FOR...
  CENTRAL TAMA COUNTY IN CENTRAL IOWA...

* UNTIL 200 AM CDT

* AT 101 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
  STORM WAS LOCATED NEAR TOLEDO...OR 15 MILES EAST OF MARSHALLTOWN...
  AND MOVING NORTHEAST AT 25 MPH.

* LOCATIONS IMPACTED INCLUDE...
  DYSART...VINING...CLUTIER...TRAER AND ELBERON.

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.

TORNADOES ARE DIFFICULT TO SEE AT NIGHT...ACT QUICKLY. TAKE COVER
NOW!

&&

LAT...LON 4191 9256 4211 9272 4228 9230 4224 9229
      4200 9230
TIME...MOT...LOC 0604Z 245DEG 23KT 4203 9259

$$

WILKINS

2 follow-up statements

587 
WWUS53 KDMX 210613
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
113 AM CDT TUE JUN 21 2011

IAC171-210700-
/O.CON.KDMX.TO.W.0049.000000T0000Z-110621T0700Z/
TAMA IA-
113 AM CDT TUE JUN 21 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR EASTERN TAMA COUNTY UNTIL
200 AM CDT...

AT 110 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS DANGEROUS
STORM WAS LOCATED NEAR TOLEDO...OR 19 MILES EAST OF MARSHALLTOWN...
MOVING NORTHEAST AT 25 MPH.

LOCATIONS IMPACTED INCLUDE...
  DYSART...VINING...CLUTIER...TRAER AND ELBERON.

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.

TORNADOES ARE DIFFICULT TO SEE AT NIGHT...ACT QUICKLY. TAKE COVER
NOW.

&&

LAT...LON 4195 9245 4216 9261 4228 9230 4224 9229
      4200 9230
TIME...MOT...LOC 0613Z 245DEG 23KT 4205 9252

$$

WILKINS

748 
WWUS53 KDMX 210631
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
131 AM CDT TUE JUN 21 2011

IAC171-210641-
/O.CAN.KDMX.TO.W.0049.000000T0000Z-110621T0700Z/
TAMA IA-
131 AM CDT TUE JUN 21 2011

...THE TORNADO WARNING FOR EASTERN TAMA COUNTY IS CANCELLED...

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

ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A TORNADO 
WATCH REMAINS IN EFFECT.

LAT...LON 4195 9245 4216 9261 4228 9230 4224 9229
      4200 9230
TIME...MOT...LOC 0631Z 245DEG 23KT 4210 9238

$$

WILKINS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 20, 8:32 PM CDT	River Flood Warning	DMX	Mahaska, Marion	7 hr
Jun 20, 8:32 PM CDT	River Flood Warning	DMX	Lucas, Wayne	11 hr
Jun 20, 8:43 PM CDT	Severe Thunderstorm Warning	DMX	Crawford	47 min
Jun 20, 9:30 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Audubon, Cass, Guthrie	45 min
Jun 20, 9:33 PM CDT	Severe Thunderstorm Warning	DMX	Calhoun, Carroll, Crawford, Greene, Sac	42 min
Jun 20, 10:00 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Adams, Cass, Taylor	30 min
Jun 20, 10:16 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Audubon, Boone, Carroll, Cass, Dallas and 3 more	44 min
Jun 20, 10:19 PM CDT	Severe Thunderstorm Warning	DMX	Calhoun, Carroll, Greene, Pocahontas, Sac, Webster	41 min
Jun 20, 10:31 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Adams, Cass, Madison, Taylor, Union	29 min
Jun 20, 10:57 PM CDT	Severe Thunderstorm Warning	DMX	Emmet, Humboldt, Kossuth, Palo Alto, Pocahontas	48 min
Jun 20, 11:26 PM CDT	Severe Thunderstorm Warning	DMX	Boone, Hamilton, Hardin, Marshall, Story	49 min
Jun 20, 11:34 PM CDT	Severe Thunderstorm Warning	DMX	Dallas, Madison, Polk, Warren	26 min
Jun 20, 11:37 PM CDT	Severe Thunderstorm Warning	DMX	Emmet, Hancock, Kossuth, Winnebago	23 min
Jun 20, 11:49 PM CDT	Severe Thunderstorm Warning	DMX	Jasper, Marshall, Polk, Story	41 min
Jun 20, 11:52 PM CDT	Tornado Warning	DMX	Jasper, Marshall, Polk, Story	23 min
Jun 21, 12:13 AM CDT	Severe Thunderstorm Warning	DMX	Hancock, Winnebago, Worth	47 min
Jun 21, 12:14 AM CDT	Tornado Warning	DMX	Grundy, Hardin	31 min
Jun 21, 12:22 AM CDT	Tornado Warning	DMX	Grundy, Marshall	23 min
Jun 21, 12:35 AM CDT	Tornado Warning	DMX	Jasper, Marshall, Tama	25 min
Jun 21, 12:39 AM CDT	Tornado Warning	DMX	Grundy, Marshall, Tama	36 min
Jun 21, 12:41 AM CDT	Tornado Warning	DMX	Butler	34 min
Jun 21, 1:02 AM CDT	Severe Thunderstorm Warning	DMX	Butler, Franklin	28 min
Jun 21, 11:15 AM CDT	River Flood Warning	DMX	Palo Alto	7 days
Jun 21, 11:15 AM CDT	River Flood Warning	DMX	Boone, Hamilton, Webster	11 days

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.