Alert archive / Iowa / Tornado Warnings in 2017

Tornado Warning 11, NWS Des Moines, IA

May 16, 2017Carroll County, Iowa

NWS Des Moines, IA issued this tornado warning at May 16, 2017, 7:59 PM CDT for Carroll County, Iowa. It was in force for 16 min. 1 report 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: May 16, 2017, 7:59 PM CDT (00:59 UTC)
Expired: May 16, 2017, 8:15 PM CDT
In force: 16 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.0 in

County Carroll County, IA

The radar

The Des Moines radar (KDMX), 107 km from the middle of the area, began a volume at 00:59 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
May 16, 8:15 PM CDT	TSTM WND GST 71	3 Wsw Glidden, IA	SUSTAINED 48 GUST 71 MPH.

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
May 16, 4:57 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 1.0 hours before the alert went out and 325 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: 825 J/kg
Mixed-layer CIN: -54 J/kg
Mixed-layer LCL: 1746 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 20 m²/s²
0-3 km storm-relative helicity: 124 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 4.1

Open this sounding in Storm Lab

The text

As transmitted.

978 
WFUS53 KDMX 170059
TORDMX
IAC027-170115-
/O.NEW.KDMX.TO.W.0011.170517T0059Z-170517T0115Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Des Moines IA
759 PM CDT TUE MAY 16 2017

The National Weather Service in Des Moines  has issued a

* Tornado Warning for...
  Northwestern Carroll County in west central Iowa...

* Until 815 PM CDT.

* At 759 PM CDT, a severe thunderstorm capable of producing a tornado
  was located near Carroll, moving northeast at 50 mph.

  HAZARD...Tornado and quarter size hail. 

  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...
  Carroll around 805 PM CDT. 
  Glidden around 810 PM CDT. 

Other locations impacted by this tornadic thunderstorm include Hobbs
County Park, Lidderdale, Arcadia, Breda, Arthur N Neu Airport, Swan
Lake State Park, Halbur, Lanesboro and Templeton.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 4207 9509 4221 9496 4221 9463 4213 9463
      4192 9494 4202 9510
TIME...MOT...LOC 0059Z 220DEG 44KT 4204 9497 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

Lee

2 follow-up statements

693 
WWUS53 KDMX 170106
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
806 PM CDT TUE MAY 16 2017

IAC027-170115-
/O.CON.KDMX.TO.W.0011.000000T0000Z-170517T0115Z/
Carroll IA-
806 PM CDT TUE MAY 16 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 815 PM CDT FOR NORTHERN
CARROLL COUNTY...
    
At 806 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Carroll, moving northeast at 50 mph.

HAZARD...Tornado and quarter size hail. 

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 tornadic thunderstorm will remain over mainly rural areas of
northern Carroll County, including the following locations: Hobbs
County Park, Lidderdale, Arcadia, Breda, Arthur N Neu Airport, Swan
Lake State Park and Lanesboro.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

This cluster of thunderstorms is capable of producing tornadoes and
widespread significant wind damage. Do not wait to see or hear the
tornado. For your protection move to an interior room on the lowest
floor of a building.

&&

LAT...LON 4221 9496 4221 9463 4213 9463 4198 9485
      4209 9507
TIME...MOT...LOC 0106Z 220DEG 44KT 4211 9489 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

Lee

782 
WWUS53 KDMX 170112
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
812 PM CDT TUE MAY 16 2017

IAC027-170122-
/O.EXP.KDMX.TO.W.0011.000000T0000Z-170517T0115Z/
Carroll IA-
812 PM CDT TUE MAY 16 2017

...THE TORNADO WARNING FOR NORTHERN CARROLL COUNTY WILL EXPIRE AT 815
PM CDT...
    
The tornado threat has diminished and the Tornado Warning has been
cancelled. However, large hail and damaging winds remain likely and a
Severe Thunderstorm Warning remains in effect for the area.  However
gusty winds are still possible with this thunderstorm.

A severe thunderstorm watch remains in effect until midnight CDT for
west central Iowa.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Des Moines .

Remember, a Severe Thunderstorm Warning still remains in effect for
830 PM CDT.

LAT...LON 4221 9496 4221 9463 4213 9463 4198 9485
      4209 9507
TIME...MOT...LOC 0112Z 220DEG 44KT 4215 9485 

$$

Lee

The office that day

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

Issued	Product	Office	Counties	Lasted
May 16, 7:02 PM CDT	Severe Thunderstorm Warning	DMX	Crawford	43 min
May 16, 7:41 PM CDT	Severe Thunderstorm Warning	DMX	Audubon, Carroll, Crawford, Sac	49 min
May 16, 7:53 PM CDT	Severe Thunderstorm Warning	DMX	Cass	37 min
May 16, 8:15 PM CDT	Severe Thunderstorm Warning	DMX	Calhoun, Carroll, Greene, Sac, Webster	45 min
May 16, 8:18 PM CDT	Severe Thunderstorm Warning	DMX	Calhoun, Pocahontas, Sac	42 min
May 16, 8:22 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Audubon, Carroll, Cass, Dallas, Greene and 1 more	38 min
May 16, 8:48 PM CDT	Severe Thunderstorm Warning	DMX	Calhoun, Hamilton, Humboldt, Webster, Wright	42 min
May 16, 8:50 PM CDT	Severe Thunderstorm Warning	DMX	Hancock, Humboldt, Kossuth, Palo Alto, Pocahontas	40 min
May 16, 8:57 PM CDT	Severe Thunderstorm Warning	DMX	Boone, Dallas, Greene, Guthrie	33 min
May 16, 9:18 PM CDT	Severe Thunderstorm Warning	DMX	Audubon, Carroll, Greene, Guthrie	22 min
May 16, 9:19 PM CDT	Severe Thunderstorm Warning	DMX	Hancock, Kossuth, Winnebago, Worth	56 min
May 16, 9:26 PM CDT	Severe Thunderstorm Warning	DMX	Cerro Gordo, Franklin, Hancock, Humboldt, Kossuth, Webster and 1 more	49 min
May 16, 9:30 PM CDT	Severe Thunderstorm Warning	DMX	Boone, Dallas, Polk, Story	15 min
May 16, 9:42 PM CDT	Severe Thunderstorm Warning	DMX	Boone, Hamilton, Hardin, Marshall, Story	34 min
May 16, 9:49 PM CDT	Severe Thunderstorm Warning	DMX	Cerro Gordo, Franklin, Hancock, Worth	26 min
May 16, 10:13 PM CDT	Severe Thunderstorm Warning	DMX	Grundy, Hamilton, Hardin, Marshall, Story	29 min
May 16, 10:15 PM CDT	Severe Thunderstorm Warning	DMX	Butler, Cerro Gordo, Franklin, Worth	33 min
May 16, 10:40 PM CDT	Severe Thunderstorm Warning	DMX	Butler, Grundy, Hardin	22 min
May 16, 10:46 PM CDT	Severe Thunderstorm Warning	DMX	Adams, Taylor	44 min
May 16, 11:19 PM CDT	Severe Thunderstorm Warning	DMX	Ringgold, Union	26 min
May 17, 12:35 AM CDT	Special Weather Statement	DMX	Jasper, Mahaska, Poweshiek	40 min
May 17, 2:42 PM CDT	Severe Thunderstorm Warning	DMX	Dallas, Madison	28 min
May 17, 3:02 PM CDT	Severe Thunderstorm Warning	DMX	Dallas, Polk	43 min
May 17, 3:14 PM CDT	Severe Thunderstorm Warning	DMX	Black Hawk, Bremer	27 min
May 17, 3:28 PM CDT	Severe Thunderstorm Warning	DMX	Boone, Story	35 min
May 17, 3:29 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Clarke, Madison, Union	29 min
May 17, 3:37 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Guthrie	23 min
May 17, 3:46 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Audubon, Carroll, Cass, Clarke, Dallas and 6 more	44 min
May 17, 3:47 PM CDT	Severe Thunderstorm Warning	DMX	Clarke, Decatur, Lucas, Marion, Union, Warren and 1 more	43 min
May 17, 3:59 PM CDT	Tornado Warning	DMX	Appanoose, Monroe	46 min
May 17, 4:17 PM CDT	Severe Thunderstorm Warning	DMX	Boone, Dallas, Greene, Guthrie, Jasper, Madison and 4 more	43 min
May 17, 4:26 PM CDT	Severe Thunderstorm Warning	DMX	Kossuth	22 min
May 17, 4:27 PM CDT	Severe Thunderstorm Warning	DMX	Appanoose, Jasper, Lucas, Mahaska, Marion, Monroe and 4 more	63 min
May 17, 4:36 PM CDT	Tornado Warning	DMX	Mahaska, Monroe, Wapello	27 min
May 17, 4:53 PM CDT	Severe Thunderstorm Warning	DMX	Boone, Grundy, Hamilton, Hardin, Jasper, Marshall and 3 more	67 min
May 17, 5:11 PM CDT	Severe Thunderstorm Warning	DMX	Humboldt, Kossuth, Webster	49 min
May 17, 5:16 PM CDT	Severe Thunderstorm Warning	DMX	Cerro Gordo, Franklin, Hamilton, Hancock, Hardin, Wright	59 min
May 17, 5:21 PM CDT	Severe Thunderstorm Warning	DMX	Davis, Wapello	39 min
May 17, 5:32 PM CDT	Severe Thunderstorm Warning	DMX	Black Hawk, Bremer, Butler	43 min
May 17, 5:53 PM CDT	Severe Thunderstorm Warning	DMX	Cerro Gordo, Hancock, Kossuth, Winnebago, Worth	34 min
May 17, 6:01 PM CDT	Severe Thunderstorm Warning	DMX	Emmet	8 min
May 17, 6:16 PM CDT	Severe Thunderstorm Warning	DMX	Black Hawk, Bremer	9 min

Nearby

Tornado Warnings in Iowa, 2017 Every tornado warning in 2017 Tornadoes in 2017

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.