Alert archive / Iowa / Tornado Warnings in 2015

Tornado Warning 37, NWS Des Moines, IA

November 11, 2015Mahaska County, Poweshiek County, Iowa

NWS Des Moines, IA issued this tornado warning at Nov 11, 2015, 4:23 PM CST for Mahaska County, Poweshiek County, Iowa. It was in force for 37 min. 3 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: Nov 11, 2015, 4:23 PM CST (22:23 UTC)
Expired: Nov 11, 2015, 5:00 PM CST
In force: 37 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Mahaska County, IA, Poweshiek County, IA

The radar

The Des Moines radar (KDMX), 110 km from the middle of the area, began a volume at 22:26 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
Nov 11, 4:24 PM CST	TORNADO	3 S Barnes City, IA	EXTENSIVE TREE DAMAGE AND FARM BUILDINGS DESTROYED AT A RESIDENCE. POLE DAMAGE ALONG V13 AND ADDITIONAL DAMAGE TO BUILDINGS AND TREES ON THE WEST SIDE OF BARNES CITY. TDS ON RADAR MATCHES DAMAGE TRACK. TIME ESTIMATED FROM RADAR.
Nov 11, 4:24 PM CST	TORNADO	3 Ssw Barnes City, IA	EXTENSIVE TREE DAMAGE AND FARM BUILDINGS DESTROYED AT A RESIDENCE. POLE DAMAGE ALONG V13 AND ADDITIONAL DAMAGE TO BUILDINGS AND TREES ON THE WEST SIDE OF BARNES CITY. TDS ON RADAR MATCHES DAMAGE TRACK. TIME ESTIMATED FROM RADAR.
Nov 11, 5:06 PM CST	TSTM WND DMG	Barnes City, IA	LIMBS AND WIRES DOWN. MACHINE SHED BLOWN OVER.

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
Nov 11, 11:25 AM CST	Tornado Watch	SPC	6 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 10.4 hours before the alert went out and 161 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: 1035 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 101 m²/s²
0-3 km storm-relative helicity: 238 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.

687 
WFUS53 KDMX 112223
TORDMX
IAC123-157-112300-
/O.NEW.KDMX.TO.W.0037.151111T2223Z-151111T2300Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
423 PM CST WED NOV 11 2015

THE NATIONAL WEATHER SERVICE IN DES MOINES  HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHEASTERN MAHASKA COUNTY IN SOUTH CENTRAL IOWA...
  SOUTHEASTERN POWESHIEK COUNTY IN CENTRAL IOWA...

* UNTIL 500 PM CST
    
* AT 423 PM CST...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED 5 MILES EAST OF NEW SHARON...OR 8 MILES SOUTH
  OF MONTEZUMA...MOVING NORTHEAST AT 50 MPH.

  HAZARD...TORNADO. 

  SOURCE...RADAR INDICATED ROTATION. 

  IMPACT...FLYING DEBRIS WILL BE DANGEROUS TO THOSE CAUGHT WITHOUT 
           SHELTER. MOBILE HOMES WILL BE DAMAGED OR DESTROYED. 
           DAMAGE TO ROOFS...WINDOWS AND VEHICLES WILL OCCUR.  TREE 
           DAMAGE IS LIKELY. 

* THIS DANGEROUS STORM WILL BE NEAR...
  MONTEZUMA AROUND 430 PM CST.
  VICTOR AROUND 450 PM CST.

OTHER LOCATIONS IMPACTED BY THIS TORNADIC THUNDERSTORM INCLUDE BARNES
CITY...GUERNSEY...VICTOR AND DEEP RIVER.

THIS INCLUDES INTERSTATE 80 BETWEEN MILE MARKERS 200 AND 204.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

HEAVY RAINFALL MAY HIDE THIS TORNADO. DO NOT WAIT TO SEE OR HEAR THE
TORNADO. TAKE COVER NOW.

&&

LAT...LON 4151 9241 4145 9241 4141 9257 4149 9262
      4179 9230 4151 9230
TIME...MOT...LOC 2223Z 222DEG 45KT 4146 9254 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

MF

1 follow-up statement

959 
WWUS53 KDMX 112256
SVSDMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
456 PM CST WED NOV 11 2015

IAC123-157-112306-
/O.EXP.KDMX.TO.W.0037.000000T0000Z-151111T2300Z/
MAHASKA IA-POWESHIEK IA-
456 PM CST WED NOV 11 2015

...THE TORNADO WARNING FOR NORTHEASTERN MAHASKA AND SOUTHEASTERN
POWESHIEK COUNTIES WILL EXPIRE AT 500 PM CST...
        
THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE AREA.
THEREFORE THE WARNING WILL BE ALLOWED TO EXPIRE.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 600 PM CST FOR SOUTH CENTRAL
IOWA.

LAT...LON 4151 9241 4145 9241 4141 9257 4149 9262
      4179 9230 4151 9230
TIME...MOT...LOC 2253Z 222DEG 45KT 4146 9254 

$$

COGIL

The office that day

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

Issued	Product	Office	Counties	Lasted
Nov 11, 1:07 PM CST	Severe Thunderstorm Warning	DMX	Calhoun, Carroll, Sac	23 min
Nov 11, 1:48 PM CST	Severe Thunderstorm Warning	DMX	Cass	30 min
Nov 11, 1:51 PM CST	Severe Thunderstorm Warning	DMX	Calhoun, Pocahontas	39 min
Nov 11, 2:01 PM CST	Severe Thunderstorm Warning	DMX	Adair, Adams, Cass	44 min
Nov 11, 2:10 PM CST	Severe Thunderstorm Warning	DMX	Ringgold, Taylor, Union	35 min
Nov 11, 2:12 PM CST	Severe Thunderstorm Warning	DMX	Adair, Audubon, Cass, Guthrie	48 min
Nov 11, 2:13 PM CST	Special Weather Statement	DMX	Adair, Boone, Clarke, Dallas, Decatur, Guthrie and 10 more	92 min
Nov 11, 2:23 PM CST	Severe Thunderstorm Warning	DMX	Clarke, Decatur, Ringgold, Union	37 min
Nov 11, 2:28 PM CST	Severe Thunderstorm Warning	DMX	Carroll, Crawford	47 min
Nov 11, 2:30 PM CST	Severe Thunderstorm Warning	DMX	Adair, Adams, Clarke, Madison, Union, Warren	45 min
Nov 11, 2:31 PM CST	Tornado Warning	DMX	Carroll	29 min
Nov 11, 2:39 PM CST	Severe Thunderstorm Warning	DMX	Decatur, Wayne	36 min
Nov 11, 2:39 PM CST	Tornado Warning	DMX	Clarke, Decatur, Ringgold	21 min
Nov 11, 2:44 PM CST	Tornado Warning	DMX	Wayne	46 min
Nov 11, 2:46 PM CST	Severe Thunderstorm Warning	DMX	Boone, Dallas, Greene, Guthrie, Madison	44 min
Nov 11, 2:54 PM CST	Severe Thunderstorm Warning	DMX	Calhoun, Sac, Webster	51 min
Nov 11, 2:55 PM CST	Severe Thunderstorm Warning	DMX	Clarke, Lucas, Warren, Wayne	50 min
Nov 11, 2:59 PM CST	Tornado Warning	DMX	Dallas, Madison	16 min
Nov 11, 3:00 PM CST	Tornado Warning	DMX	Greene, Guthrie	30 min
Nov 11, 3:04 PM CST	Tornado Warning Tornado observed	DMX	Madison, Warren	26 min
Nov 11, 3:07 PM CST	Severe Thunderstorm Warning	DMX	Boone, Dallas, Polk, Story, Warren	53 min
Nov 11, 3:09 PM CST	Tornado Warning	DMX	Boone, Dallas	25 min
Nov 11, 3:18 PM CST	Tornado Warning	DMX	Appanoose, Lucas, Monroe, Wayne	27 min
Nov 11, 3:27 PM CST	Severe Thunderstorm Warning	DMX	Jasper, Marion	48 min
Nov 11, 3:27 PM CST	Tornado Warning	DMX	Appanoose, Monroe, Wapello	33 min
Nov 11, 3:31 PM CST	Severe Thunderstorm Warning	DMX	Appanoose	34 min
Nov 11, 3:44 PM CST	Tornado Warning	DMX	Jasper	31 min
Nov 11, 3:47 PM CST	Severe Thunderstorm Warning	DMX	Mahaska, Monroe, Wapello	43 min
Nov 11, 3:52 PM CST	Severe Thunderstorm Warning	DMX	Hamilton, Hardin, Jasper, Marshall, Polk, Story and 1 more	53 min
Nov 11, 3:52 PM CST	Severe Thunderstorm Warning	DMX	Davis, Wapello	38 min
Nov 11, 3:56 PM CST	Tornado Warning	DMX	Jasper, Mahaska, Marion, Poweshiek	41 min
Nov 11, 4:03 PM CST	Severe Thunderstorm Warning	DMX	Jasper, Mahaska, Marion, Marshall, Poweshiek, Tama	57 min
Nov 11, 4:10 PM CST	Special Weather Statement	DMX	Black Hawk, Bremer, Butler, Grundy, Hamilton, Hardin and 6 more	65 min
Nov 11, 4:10 PM CST	Tornado Warning	DMX	Mahaska	20 min
Nov 11, 4:12 PM CST	Tornado Warning	DMX	Marshall, Tama	18 min
Nov 11, 4:30 PM CST	Tornado Warning	DMX	Grundy, Marshall, Tama	30 min
Nov 11, 4:39 PM CST	Severe Thunderstorm Warning	DMX	Black Hawk, Grundy, Tama	51 min
Nov 11, 5:02 PM CST	Tornado Warning	DMX	Black Hawk	23 min

Nearby

Tornado Warnings in Iowa, 2015 Every tornado warning in 2015 Tornadoes in 2015

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.