Alert archive / Iowa / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 10, NWS Des Moines, IA

June 18, 20215 counties in Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Jun 18, 2021, 9:56 PM CDT for 5 counties in Iowa. It was in force for 49 min. 8 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 18, 2021, 9:56 PM CDT (02:56 UTC)
Expired: Jun 18, 2021, 10:45 PM CDT
In force: 49 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Clarke County, IA, Lucas County, IA, Madison County, IA, Marion County, IA, Warren County, IA

The radar

The Des Moines radar (KDMX), 68 km from the middle of the area, began a volume at 02:56 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 18, 10:09 PM CDT	HAIL 1	6 Ene New Virginia, IA	DELAYED REPORT FROM LAST NIGHT.
Jun 18, 10:20 PM CDT	HAIL 1.25	6 W Lacona, IA	DELAYED REPORT OF HALF DOLLAR SIZED HAIL RELAYED VIA SOCIAL MEDIA.
Jun 18, 10:20 PM CDT	HAIL 1.75	7 W Lacona, IA	DELAYED REPORT. 72 HOUR RAINFALL TOTAL 6/18 TO 6/21 OF 4.24 INCHES AS WELL.
Jun 18, 10:33 PM CDT	HAIL 1.25	6 W Lacona, IA
Jun 18, 10:55 PM CDT	HAIL 1	1 Wnw Chariton, IA	LUCAS COUNTY SHERIFFS OFFICE REPORTED QUARTER SIZED HAIL AT THE OFFICE.
Jun 18, 10:55 PM CDT	HAIL 1	Chariton, IA	LUCAS COUNTY SHERIFFS OFFICE REPORTED QUARTER SIZED HAIL AT THE OFFICE.
Jun 18, 10:55 PM CDT	HAIL 1	Chariton, IA
Jun 18, 10:55 PM CDT	HAIL 2	Chariton, IA	VIA SOCIAL MEDIA/BROADCAST MEDIA.

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

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 2.9 hours before the alert went out and 227 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: 2090 J/kg
Mixed-layer CIN: -169 J/kg
Mixed-layer LCL: 1569 m above ground
0-6 km bulk shear: 59 kt
0-1 km storm-relative helicity: 46 m²/s²
0-3 km storm-relative helicity: 307 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.3

Open this sounding in Storm Lab

The text

As transmitted.

738 
WUUS53 KDMX 190256
SVRDMX
IAC039-117-121-125-181-190345-
/O.NEW.KDMX.SV.W.0010.210619T0256Z-210619T0345Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Des Moines IA
956 PM CDT Fri Jun 18 2021

The National Weather Service in Des Moines  has issued a

* Severe Thunderstorm Warning for...
  Western Lucas County in south central Iowa...
  Southeastern Madison County in south central Iowa...
  Southwestern Marion County in south central Iowa...
  Northern Clarke County in south central Iowa...
  Southern Warren County in south central Iowa...

* Until 1045 PM CDT.

* At 955 PM CDT, a severe thunderstorm was located 8 miles north of 
  Osceola, moving east at 35 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...
  Chariton.

This includes Interstate 35 between mile markers 36 and 48.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4110 9394 4123 9394 4126 9321 4093 9329
TIME...MOT...LOC 0255Z 278DEG 35KT 4115 9380 

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

Martin

2 follow-up statements

462 
WWUS53 KDMX 190308
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
1008 PM CDT Fri Jun 18 2021

IAC039-117-121-125-181-190345-
/O.CON.KDMX.SV.W.0010.000000T0000Z-210619T0345Z/
Lucas IA-Madison IA-Marion IA-Clarke IA-Warren IA-
1008 PM CDT Fri Jun 18 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1045 PM CDT
FOR WESTERN LUCAS...SOUTHEASTERN MADISON...SOUTHWESTERN MARION...
NORTHERN CLARKE AND SOUTHERN WARREN COUNTIES...

At 1007 PM CDT, a severe thunderstorm was located 10 miles northeast
of Osceola, moving east at 35 mph.

HAZARD...Ping pong 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...
Osceola, Chariton, Melcher-Dallas, New Virginia, Truro, Lacona,
Lucas, Woodburn, Williamson, East Peru, Otter Creek County Park,
Chariton Municipal Airport and Red Haw Lake State Park.

This includes Interstate 35 between mile markers 36 and 48.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4110 9394 4123 9394 4126 9321 4093 9329
TIME...MOT...LOC 0307Z 278DEG 35KT 4113 9364 

HAIL...1.50IN
WIND...60MPH
 
$$

Martin

418 
WWUS53 KDMX 190323
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
1023 PM CDT Fri Jun 18 2021

IAC039-117-121-125-181-190345-
/O.CON.KDMX.SV.W.0010.000000T0000Z-210619T0345Z/
Lucas IA-Madison IA-Marion IA-Clarke IA-Warren IA-
1023 PM CDT Fri Jun 18 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1045 PM CDT
FOR WESTERN LUCAS...SOUTHEASTERN MADISON...SOUTHWESTERN MARION...
NORTHERN CLARKE AND SOUTHERN WARREN COUNTIES...

At 1022 PM CDT, a severe thunderstorm was located 12 miles northwest 
of Chariton, moving east at 35 mph.

HAZARD...Two inch 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...
Osceola, Chariton, Melcher-Dallas, New Virginia, Truro, Lacona,
Lucas, Woodburn, Williamson, East Peru, Otter Creek County Park,
Chariton Municipal Airport and Red Haw Lake State Park.

This includes Interstate 35 between mile markers 36 and 48.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4110 9394 4123 9394 4126 9321 4093 9329
TIME...MOT...LOC 0322Z 278DEG 35KT 4111 9344 

HAIL...2.00IN
WIND...60MPH
 
$$

Martin

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 18, 10:06 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Clarke, Madison, Union	39 min
Jun 18, 10:39 PM CDT	Severe Thunderstorm Warning	DMX	Lucas, Monroe, Wayne	51 min
Jun 18, 10:43 PM CDT	Severe Thunderstorm Warning	DMX	Clarke, Lucas, Madison, Union, Warren	47 min
Jun 18, 10:45 PM CDT	Severe Thunderstorm Warning	DMX	Mahaska, Marion, Monroe, Wapello	45 min
Jun 18, 10:54 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Cass	51 min
Jun 18, 11:05 PM CDT	Severe Thunderstorm Warning	DMX	Mahaska, Marion	25 min
Jun 18, 11:10 PM CDT	Severe Thunderstorm Warning	DMX	Appanoose, Lucas, Monroe, Wayne	50 min
Jun 18, 11:14 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Madison	46 min
Jun 18, 11:19 PM CDT	Severe Thunderstorm Warning	DMX	Mahaska	26 min
Jun 18, 11:22 PM CDT	Severe Thunderstorm Warning	DMX	Appanoose, Davis, Monroe, Wapello	53 min
Jun 18, 11:25 PM CDT	Severe Thunderstorm Warning	DMX	Clarke, Decatur, Lucas, Wayne	50 min
Jun 18, 11:32 PM CDT	Severe Thunderstorm Warning	DMX	Cass	28 min
Jun 18, 11:37 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Adams, Union	53 min
Jun 18, 11:54 PM CDT	Severe Thunderstorm Warning	DMX	Clarke, Madison, Warren	36 min
Jun 18, 11:55 PM CDT	Severe Thunderstorm Warning	DMX	Appanoose, Lucas, Monroe, Wayne	50 min
Jun 18, 11:59 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Adams, Clarke, Madison, Ringgold, Union	46 min
Jun 19, 12:13 AM CDT	Severe Thunderstorm Warning	DMX	Adams	26 min
Jun 19, 12:14 AM CDT	Severe Thunderstorm Warning	DMX	Davis, Wapello	31 min
Jun 19, 12:25 AM CDT	Severe Thunderstorm Warning	DMX	Clarke, Lucas, Marion, Warren	35 min
Jun 19, 12:29 AM CDT	Severe Thunderstorm Warning	DMX	Appanoose, Davis	46 min
Jun 19, 12:44 AM CDT	Severe Thunderstorm Warning	DMX	Lucas, Marion, Monroe	31 min
Jun 19, 3:59 AM CDT	Special Weather Statement	DMX	Davis	46 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2021 Every severe thunderstorm warning in 2021

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.