Alert archive / Iowa / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 25, NWS Des Moines, IA

June 18, 20214 counties in Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Jun 18, 2021, 11:55 PM CDT for 4 counties in Iowa. It was in force for 50 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jun 18, 2021, 11:55 PM CDT (04:55 UTC)
Expired: Jun 19, 2021, 12:45 AM CDT
In force: 50 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Hail: 1.5 in
Wind: 60.0 mph

Counties Appanoose County, IA, Lucas County, IA, Monroe County, IA, Wayne County, IA

The radar

The Des Moines radar (KDMX), 118 km from the middle of the area, began a volume at 04:55 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.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jun 18, 10:08 PM CDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 4.9 hours before the alert went out and 238 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: 4 J/kg
Mixed-layer CIN: -335 J/kg
Mixed-layer LCL: 2572 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: -15 m²/s²
0-3 km storm-relative helicity: 55 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

659 
WUUS53 KDMX 190455
SVRDMX
IAC007-117-135-185-190545-
/O.NEW.KDMX.SV.W.0025.210619T0455Z-210619T0545Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Des Moines IA
1155 PM CDT Fri Jun 18 2021

The National Weather Service in Des Moines  has issued a

* Severe Thunderstorm Warning for...
  Southwestern Monroe County in south central Iowa...
  Southeastern Lucas County in south central Iowa...
  Northeastern Wayne County in south central Iowa...
  Appanoose County in south central Iowa...

* Until 1245 AM CDT.

* At 1155 PM CDT, a severe thunderstorm was located 8 miles north of
  Corydon, moving southeast at 30 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.

* This severe thunderstorm will be near...
  Rathbun Lake around 1210 AM CDT.

Other locations in the path of this severe thunderstorm include
Centerville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4081 9344 4102 9322 4085 9264 4059 9287
      4058 9309
TIME...MOT...LOC 0455Z 299DEG 24KT 4088 9327 

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

Martin

2 follow-up statements

311 
WWUS53 KDMX 190516
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
1216 AM CDT Sat Jun 19 2021

IAC117-135-185-190526-
/O.CAN.KDMX.SV.W.0025.000000T0000Z-210619T0545Z/
Monroe IA-Lucas IA-Wayne IA-
1216 AM CDT Sat Jun 19 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN MONROE...
SOUTHEASTERN LUCAS AND NORTHEASTERN WAYNE COUNTIES IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 500 AM CDT for
south central Iowa.

LAT...LON 4059 9310 4090 9310 4090 9281 4085 9264
      4059 9287
TIME...MOT...LOC 0516Z 298DEG 39KT 4080 9301 

$$

IAC007-190545-
/O.CON.KDMX.SV.W.0025.000000T0000Z-210619T0545Z/
Appanoose IA-
1216 AM CDT Sat Jun 19 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1245 AM CDT
FOR APPANOOSE COUNTY...

At 1216 AM CDT, a severe thunderstorm was located near Rathbun Lake,
or 8 miles northwest of Centerville, moving southeast at 45 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...
  Centerville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4059 9310 4090 9310 4090 9281 4085 9264
      4059 9287
TIME...MOT...LOC 0516Z 298DEG 39KT 4080 9301 

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

Martin

934 
WWUS53 KDMX 190543
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
1243 AM CDT Sat Jun 19 2021

IAC007-190552-
/O.EXP.KDMX.SV.W.0025.000000T0000Z-210619T0545Z/
Appanoose IA-
1243 AM CDT Sat Jun 19 2021

...THE SEVERE THUNDERSTORM WARNING FOR APPANOOSE COUNTY WILL EXPIRE
AT 1245 AM CDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.

A Severe Thunderstorm Watch remains in effect until 500 AM CDT for
south central Iowa.

Remember, a Severe Thunderstorm Warning still remains in effect for
far western Appanoose County.

LAT...LON 4059 9310 4090 9310 4090 9281 4085 9264
      4059 9287
TIME...MOT...LOC 0542Z 299DEG 24KT 4073 9284 

$$

Hagenhoff

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 18, 9:56 PM CDT	Severe Thunderstorm Warning	DMX	Clarke, Lucas, Madison, Marion, Warren	49 min
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, 11:59 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.