Alert archive / Iowa / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 7, NWS Des Moines, IA

March 6, 2017Calhoun County, Pocahontas County, Webster County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Mar 6, 2017, 4:13 PM CST for Calhoun County, Pocahontas County, Webster County, Iowa. It was in force for 47 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: Mar 6, 2017, 4:13 PM CST (22:13 UTC)
Expired: Mar 6, 2017, 5:00 PM CST
In force: 47 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

Counties Calhoun County, IA, Pocahontas County, IA, Webster County, IA

The radar

The Des Moines radar (KDMX), 99 km from the middle of the area, began a volume at 22:16 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 6, 4:20 PM CST	HAIL 1	4 Ne Somers, IA	WIND DRIVEN HAIL BROKE WINDOW SCREENS AT THE RESIDENCE. .
Mar 6, 4:24 PM CST	HAIL 1.75	5 E Barnum, IA	BETWEEN FORT DODGE AND BARNUM.
Mar 6, 4:25 PM CST	HAIL 1	3 Sw Badger, IA	COOP OBSERVER/TRAINED SPOTTER REPORTED UP TO QUARTER SIZED HAIL.

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 6, 1:54 PM CST	Tornado Watch	SPC	8 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 10.2 hours before the alert went out and 213 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: 788 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 437 m²/s²
0-3 km storm-relative helicity: 464 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

655 
WUUS53 KDMX 062213
SVRDMX
IAC025-151-187-062300-
/O.NEW.KDMX.SV.W.0007.170306T2213Z-170306T2300Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Des Moines IA
413 PM CST MON MAR 6 2017

The National Weather Service in Des Moines  has issued a

* Severe Thunderstorm Warning for...
  Webster County in central Iowa...
  Southeastern Pocahontas County in northwestern Iowa...
  Eastern Calhoun County in west central Iowa...

* Until 500 PM CST.

* At 413 PM CST, a severe thunderstorm was located near Gowrie, or 12
  miles east of Rockwell City, moving north at 75 mph.

  HAZARD...60 mph wind gusts and half dollar size hail. 

  SOURCE...Radar indicated. 

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees. 

* Locations impacted include...
  Fort Dodge, Manson, Gowrie, Fort Dodge Regional Airport, Coalville,
  Badger, Otho, Callender, Farnhamville, Lohrville, Barnum, Vincent,
  Moorland, Clare, Somers, Knierim, Rinard and Lizard Creek State
  Recreation Area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A tornado watch remains in effect for the warned area. Tornadoes can
develop quickly from severe thunderstorms. Although a tornado is not
immediately likely, if one is spotted, act quickly and move to a
place of safety inside a sturdy structure such as a basement or small
interior room.

For your protection move to an interior room on the lowest floor of a
building.

&&

A tornado watch remains in effect until 1000 PM CST for central,
north central, northwestern and west central Iowa.

LAT...LON 4265 9458 4264 9397 4261 9397 4221 9430
      4221 9459
TIME...MOT...LOC 2213Z 198DEG 67KT 4234 9439 

HAIL...1.25IN
WIND...60MPH
 
$$

Small

1 follow-up statement

794 
WWUS53 KDMX 062216
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
416 PM CST MON MAR 6 2017

IAC025-151-187-062300-
/O.CON.KDMX.SV.W.0007.000000T0000Z-170306T2300Z/
Webster IA-Pocahontas IA-Calhoun IA-
416 PM CST MON MAR 6 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM CST
FOR NORTHWESTERN WEBSTER...SOUTHEASTERN POCAHONTAS AND NORTHEASTERN
CALHOUN COUNTIES...

At 416 PM CST, a severe thunderstorm was located 9 miles north of
Gowrie, or 11 miles southwest of Fort Dodge, moving north at 75 mph.

HAZARD...Golf ball size hail and 60 mph wind gusts. 

SOURCE...Radar indicated. 

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect wind 
         damage to roofs, siding, and trees. 

Locations impacted include...
Fort Dodge, Manson, Gowrie, Fort Dodge Regional Airport, Coalville,
Badger, Otho, Callender, Farnhamville, Barnum, Vincent, Moorland,
Clare, Somers, Knierim, Rinard and Lizard Creek State Recreation
Area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A tornado watch remains in effect for the warned area. Tornadoes can
develop quickly from severe thunderstorms. Although a tornado is not
immediately likely, if one is spotted act quickly and move to a place
of safety inside a sturdy structure, such as a basement or small
interior room.

This storm is producing large hail. SEEK SHELTER NOW inside a sturdy
structure and stay away from windows.

&&

A tornado watch remains in effect until 1000 PM CST for central,
north central, northwestern and west central Iowa.

LAT...LON 4265 9458 4264 9397 4261 9397 4228 9424
      4228 9450
TIME...MOT...LOC 2216Z 198DEG 67KT 4241 9436 

HAIL...1.75IN
WIND...60MPH
 
$$

Small

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 6, 4:25 AM CST	Wind Advisory	DMX	Adair, Adams, Appanoose, Audubon, Black Hawk, Boone and 41 more	24 hr
Mar 6, 3:28 PM CST	Fire Weather Watch	DMX	Black Hawk, Boone, Bremer, Butler, Calhoun, Carroll and 27 more	13 hr
Mar 6, 3:29 PM CST	Wind Advisory	DMX	Adair, Adams, Appanoose, Audubon, Black Hawk, Boone and 45 more	27 hr
Mar 6, 3:40 PM CST	Severe Thunderstorm Warning	DMX	Audubon, Carroll, Greene, Guthrie	50 min
Mar 6, 3:50 PM CST	Severe Thunderstorm Warning	DMX	Calhoun, Crawford, Sac	55 min
Mar 6, 4:04 PM CST	Severe Thunderstorm Warning	DMX	Emmet, Kossuth, Palo Alto, Pocahontas	41 min
Mar 6, 4:13 PM CST	Tornado Warning	DMX	Emmet, Kossuth, Palo Alto	33 min
Mar 6, 4:19 PM CST	Severe Thunderstorm Warning	DMX	Calhoun, Carroll, Crawford, Sac	41 min
Mar 6, 4:29 PM CST	Severe Thunderstorm Warning	DMX	Hancock, Humboldt, Kossuth, Webster, Wright	46 min
Mar 6, 4:31 PM CST	Severe Thunderstorm Warning	DMX	Audubon, Calhoun, Carroll, Greene	44 min
Mar 6, 4:41 PM CST	Severe Thunderstorm Warning	DMX	Hamilton, Humboldt, Webster, Wright	49 min
Mar 6, 4:43 PM CST	Severe Thunderstorm Warning	DMX	Kossuth, Palo Alto	18 min
Mar 6, 4:47 PM CST	Severe Thunderstorm Warning	DMX	Kossuth, Winnebago	33 min
Mar 6, 4:58 PM CST	Severe Thunderstorm Warning	DMX	Hancock, Humboldt, Kossuth, Webster, Winnebago, Wright	47 min
Mar 6, 5:00 PM CST	Severe Thunderstorm Warning	DMX	Calhoun, Humboldt, Kossuth, Pocahontas, Webster	45 min
Mar 6, 5:07 PM CST	Severe Thunderstorm Warning	DMX	Adair, Audubon, Cass, Greene, Guthrie	68 min
Mar 6, 5:10 PM CST	Severe Thunderstorm Warning	DMX	Boone, Calhoun, Greene, Webster	50 min
Mar 6, 5:29 PM CST	Tornado Warning	DMX	Hamilton, Webster	31 min
Mar 6, 5:37 PM CST	Severe Thunderstorm Warning	DMX	Franklin, Hamilton, Hardin, Humboldt, Webster, Wright	38 min
Mar 6, 5:53 PM CST	Severe Thunderstorm Warning	DMX	Adams, Cass, Ringgold, Taylor, Union	52 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2017 Every severe thunderstorm warning 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.