Alert archive / Iowa / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 252, NWS Des Moines, IA

August 28, 2018Palo Alto County, Pocahontas County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Aug 28, 2018, 6:21 AM CDT for Palo Alto County, Pocahontas County, Iowa. It was in force for 54 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: Aug 28, 2018, 6:21 AM CDT (11:21 UTC)
Expired: Aug 28, 2018, 7:15 AM CDT
In force: 54 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Palo Alto County, IA, Pocahontas County, IA

The radar

The Des Moines radar (KDMX), 159 km from the middle of the area, began a volume at 11:22 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
Aug 28, 6:38 AM CDT	HAIL 3	2 S Ayrshire, IA	VIA SOCIAL MEDIA - TIME ESTIMATED VIA RADAR.
Aug 28, 6:58 AM CDT	HAIL 2.75	2 N Plover, IA	VIA SOCIAL MEDIA - TIME ESTIMATED BY RADAR.
Aug 28, 7:12 AM CDT	HAIL 2.75	West Bend, IA	A FEW WINDOWS BROKEN BY HAIL. DELAYED REPORT - TIME ESTIMATED BY RADAR.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 11.4 hours before the alert went out and 222 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: 750 J/kg
Mixed-layer CIN: -22 J/kg
Mixed-layer LCL: 879 m above ground
0-6 km bulk shear: 64 kt
0-1 km storm-relative helicity: -130 m²/s²
0-3 km storm-relative helicity: 230 m²/s²
Significant tornado parameter: -0.2
Supercell composite: -2.6

Open this sounding in Storm Lab

The text

As transmitted.

116 
WUUS53 KDMX 281121
SVRDMX
IAC147-151-281215-
/O.NEW.KDMX.SV.W.0252.180828T1121Z-180828T1215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Des Moines IA
621 AM CDT TUE AUG 28 2018

The National Weather Service in Des Moines  has issued a

* Severe Thunderstorm Warning for...
  Northern Pocahontas County in northwestern Iowa...
  Palo Alto County in northwestern Iowa...

* Until 715 AM CDT.

* At 620 AM CDT, a severe thunderstorm was located near Webb, or 10
  miles southeast of Spencer in Clay County, moving east at 40 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Emmetsburg, Five Island Lake, Silver Lake, Rush Lake, Lost Island
  Lake, Graettinger, West Bend, Ruthven, Mallard, Ayrshire, Cylinder,
  Plover, Curlew, Rodman, Kearney State Park, Lost Island Lake State
  Park and Emmetsburg Municipal Airport.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4281 9444 4287 9492 4322 9491 4325 9444
TIME...MOT...LOC 1120Z 265DEG 36KT 4303 9503 

HAIL...1.00IN
WIND...60MPH
 
$$

Beerends

5 follow-up statements

368 
WUUS53 KDMX 281124 CCA
SVRDMX
IAC147-151-281215-
/O.COR.KDMX.SV.W.0252.180828T1121Z-180828T1215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Des Moines IA
624 AM CDT TUE AUG 28 2018

The National Weather Service in Des Moines  has issued a

* Severe Thunderstorm Warning for...
  Northern Pocahontas County in northwestern Iowa...
  Palo Alto County in northwestern Iowa...

* Until 715 AM CDT.

* At 623 AM CDT, a severe thunderstorm was located near Silver Lake, 
  or 10 miles southeast of Spencer in Clay County, moving east at 40 
  mph.

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

  SOURCE...Radar indicated. At 619 am CDT, trained spotters reported 
           golf ball size hail 3 miles east of Greenville in Clay 
           County. 

  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...
  Emmetsburg, Five Island Lake, Silver Lake, Rush Lake, Lost Island
  Lake, Graettinger, West Bend, Ruthven, Mallard, Ayrshire, Cylinder,
  Plover, Curlew, Rodman, Kearney State Park, Lost Island Lake State
  Park and Emmetsburg Municipal Airport.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4281 9444 4287 9492 4322 9491 4325 9444
TIME...MOT...LOC 1123Z 265DEG 36KT 4303 9503 

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

Beerends

848 
WWUS53 KDMX 281143
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
643 AM CDT TUE AUG 28 2018

IAC147-151-281215-
/O.CON.KDMX.SV.W.0252.000000T0000Z-180828T1215Z/
Pocahontas IA-Palo Alto IA-
643 AM CDT TUE AUG 28 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 AM CDT
FOR NORTHERN POCAHONTAS AND PALO ALTO COUNTIES...

At 642 AM CDT, severe thunderstorms were located along a line
extending from near Silver Lake to near Rush Lake, moving east at 40
mph.

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

SOURCE...Trained weather spotters.

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...
Emmetsburg, Five Island Lake, Silver Lake, Rush Lake, West Bend,
Ruthven, Mallard, Ayrshire, Cylinder, Plover, Curlew, Rodman, Kearney
State Park and Emmetsburg Municipal Airport.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

These storms are producing large hail. SEEK SHELTER NOW inside a
sturdy structure and stay away from windows.

&&

LAT...LON 4281 9444 4287 9492 4313 9491 4321 9444
TIME...MOT...LOC 1142Z 276DEG 36KT 4303 9483 4291 9487 

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

Beerends

873 
WWUS53 KDMX 281150
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
650 AM CDT TUE AUG 28 2018

IAC147-151-281215-
/O.CON.KDMX.SV.W.0252.000000T0000Z-180828T1215Z/
Pocahontas IA-Palo Alto IA-
650 AM CDT TUE AUG 28 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 AM CDT
FOR NORTHERN POCAHONTAS AND PALO ALTO COUNTIES...

At 650 AM CDT, severe thunderstorms were located along a line
extending from 6 miles southwest of Emmetsburg to near Rush Lake,
moving east at 40 mph.

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

SOURCE...Trained weather spotters.

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...
Emmetsburg, Silver Lake, Rush Lake, Five Island Lake, West Bend,
Mallard, Ayrshire, Cylinder, Plover, Curlew, Rodman and Emmetsburg
Municipal Airport.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

These storms are producing large hail. SEEK SHELTER NOW inside a
sturdy structure and stay away from windows.

&&

LAT...LON 4281 9444 4287 9492 4308 9491 4318 9444
TIME...MOT...LOC 1150Z 265DEG 36KT 4304 9474 4292 9478 

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

Beerends

841 
WWUS53 KDMX 281204
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
704 AM CDT TUE AUG 28 2018

IAC147-151-281215-
/O.CON.KDMX.SV.W.0252.000000T0000Z-180828T1215Z/
Pocahontas IA-Palo Alto IA-
704 AM CDT TUE AUG 28 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 AM CDT
FOR NORTHEASTERN POCAHONTAS AND SOUTHEASTERN PALO ALTO COUNTIES...

At 704 AM CDT, severe thunderstorms were located along a line
extending from 7 miles southeast of Emmetsburg to 13 miles north of
Pocahontas, moving east at 40 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...
West Bend, Rolfe, Mallard, Cylinder, Plover, Curlew and Rodman. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

These storms are producing large hail. SEEK SHELTER NOW inside a
sturdy structure and stay away from windows.

&&

LAT...LON 4285 9478 4308 9470 4318 9444 4281 9444
TIME...MOT...LOC 1204Z 265DEG 36KT 4305 9456 4293 9460 

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

Beerends

527 
WWUS53 KDMX 281214
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
714 AM CDT TUE AUG 28 2018

IAC147-151-281223-
/O.EXP.KDMX.SV.W.0252.000000T0000Z-180828T1215Z/
Pocahontas IA-Palo Alto IA-
714 AM CDT TUE AUG 28 2018

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN POCAHONTAS AND
SOUTHEASTERN PALO ALTO COUNTIES WILL EXPIRE AT 715 AM CDT...
    
The storms which prompted the warning have moved out of the area.
Therefore, the warning will be allowed to expire.  However gusty
winds and heavy rain are still possible with these thunderstorms.

Remember, a Severe Thunderstorm Warning still remains in effect for
far eastern Palo Alto and Pocahontas Counties until 8 am CDT.

LAT...LON 4285 9478 4308 9470 4318 9444 4281 9444
TIME...MOT...LOC 1213Z 265DEG 36KT 4306 9444 4294 9448 

$$

Beerends

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 28, 6:56 AM CDT	Special Weather Statement	DMX	Pocahontas	34 min
Aug 28, 7:08 AM CDT	Severe Thunderstorm Warning	DMX	Hancock, Humboldt, Kossuth, Palo Alto, Pocahontas, Wright	45 min
Aug 28, 7:44 AM CDT	Severe Thunderstorm Warning	DMX	Cerro Gordo, Franklin, Hancock, Humboldt, Kossuth, Winnebago and 2 more	46 min
Aug 28, 8:07 AM CDT	Severe Thunderstorm Warning	DMX	Butler, Cerro Gordo, Franklin, Worth	38 min
Aug 28, 8:44 AM CDT	Severe Thunderstorm Warning	DMX	Butler, Cerro Gordo, Franklin	16 min
Aug 28, 8:56 AM CDT	Special Weather Statement	DMX	Bremer, Butler	64 min
Aug 28, 11:09 AM CDT	Special Weather Statement	DMX	Madison	36 min
Aug 28, 11:25 AM CDT	Special Weather Statement	DMX	Boone, Story	50 min
Aug 28, 11:27 AM CDT	Special Weather Statement	DMX	Franklin	48 min
Aug 28, 11:34 AM CDT	Severe Thunderstorm Warning	DMX	Boone, Dallas, Hamilton, Story	41 min
Aug 28, 11:41 AM CDT	Special Weather Statement	DMX	Humboldt	49 min
Aug 28, 11:50 AM CDT	Special Weather Statement	DMX	Adair, Audubon, Boone, Calhoun, Carroll, Cass and 9 more	55 min
Aug 28, 12:15 PM CDT	Severe Thunderstorm Warning	DMX	Humboldt, Kossuth, Webster, Wright	30 min
Aug 28, 12:39 PM CDT	Severe Thunderstorm Warning	DMX	Hancock, Kossuth, Winnebago	36 min
Aug 28, 12:47 PM CDT	Severe Thunderstorm Warning	DMX	Butler, Cerro Gordo, Franklin, Hancock, Wright	43 min
Aug 28, 12:51 PM CDT	Special Weather Statement	DMX	Boone, Calhoun, Carroll, Dallas, Greene, Guthrie and 8 more	54 min
Aug 28, 1:03 PM CDT	Severe Thunderstorm Warning	DMX	Calhoun, Pocahontas, Sac	42 min
Aug 28, 1:38 PM CDT	Severe Thunderstorm Warning	DMX	Boone, Franklin, Hamilton, Hardin, Story, Webster and 1 more	52 min
Aug 28, 1:47 PM CDT	Special Weather Statement	DMX	Cerro Gordo, Hancock, Humboldt, Kossuth, Winnebago	43 min
Aug 28, 4:34 PM CDT	Severe Thunderstorm Warning	DMX	Mahaska, Marion	41 min
Aug 28, 4:38 PM CDT	Severe Thunderstorm Warning	DMX	Decatur, Wayne	52 min
Aug 28, 4:50 PM CDT	Severe Thunderstorm Warning	DMX	Lucas, Mahaska, Marion, Monroe, Warren, Wayne	40 min
Aug 28, 5:03 PM CDT	Severe Thunderstorm Warning	DMX	Jasper, Mahaska, Poweshiek	42 min
Aug 28, 5:17 PM CDT	Severe Thunderstorm Warning	DMX	Mahaska, Monroe, Wapello	43 min
Aug 28, 5:30 PM CDT	Severe Thunderstorm Warning	DMX	Appanoose, Lucas, Monroe, Wayne	45 min
Aug 28, 5:47 PM CDT	Severe Thunderstorm Warning	DMX	Appanoose, Davis, Monroe, Wapello	58 min
Aug 28, 6:43 PM CDT	Severe Thunderstorm Warning	DMX	Davis, Wapello	47 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2018 Every severe thunderstorm warning in 2018

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.