Alert archive / Iowa / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 26, NWS Des Moines, IA

June 18, 20216 counties in Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Jun 18, 2021, 11:59 PM CDT for 6 counties in Iowa. It was in force for 46 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, 11:59 PM CDT (04:59 UTC)
Expired: Jun 19, 2021, 12:45 AM CDT
In force: 46 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

Counties Adair County, IA, Adams County, IA, Clarke County, IA, Madison County, IA, Ringgold County, IA, Union County, IA

The radar

The Des Moines radar (KDMX), 89 km from the middle of the area, began a volume at 05:00 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

Omaha, NE (KOAX), launched 00:00Z, 5.0 hours before the alert went out and 173 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.

994 
WUUS53 KDMX 190459
SVRDMX
IAC001-003-039-121-159-175-190545-
/O.NEW.KDMX.SV.W.0026.210619T0459Z-210619T0545Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Des Moines IA
1159 PM CDT Fri Jun 18 2021

The National Weather Service in Des Moines  has issued a

* Severe Thunderstorm Warning for...
  Southwestern Madison County in south central Iowa...
  Union County in south central Iowa...
  Northeastern Adams County in southwestern Iowa...
  North central Ringgold County in south central Iowa...
  West central Clarke County in south central Iowa...
  Southeastern Adair County in southwestern Iowa...

* Until 1245 AM CDT.

* At 1159 PM CDT, a severe thunderstorm was located near Green Valley
  Lake, or 7 miles north of Creston, moving southeast at 35 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.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4110 9461 4129 9442 4108 9388 4080 9415
TIME...MOT...LOC 0459Z 300DEG 31KT 4116 9441 

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

Curtis

2 follow-up statements

175 
WWUS53 KDMX 190520
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
1220 AM CDT Sat Jun 19 2021

IAC003-190529-
/O.CAN.KDMX.SV.W.0026.000000T0000Z-210619T0545Z/
Adams IA-
1220 AM CDT Sat Jun 19 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN ADAMS COUNTY 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 and southwestern Iowa.

LAT...LON 4109 9436 4123 9427 4108 9388 4089 9406
TIME...MOT...LOC 0519Z 300DEG 31KT 4107 9420 

$$

IAC001-039-121-159-175-190545-
/O.CON.KDMX.SV.W.0026.000000T0000Z-210619T0545Z/
Madison IA-Union IA-Ringgold IA-Clarke IA-Adair IA-
1220 AM CDT Sat Jun 19 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1245 AM CDT
FOR SOUTHWESTERN MADISON...EASTERN UNION...NORTHEASTERN RINGGOLD...
WEST CENTRAL CLARKE AND SOUTHEASTERN ADAIR COUNTIES...

At 1219 AM CDT, a severe thunderstorm was located 8 miles east of
Creston, moving southeast 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.

This severe thunderstorm will remain over mainly rural areas of
southwestern Madison, eastern Union, northeastern Ringgold, west
central Clarke and southeastern Adair Counties, including the
following locations... Afton, Murray, Murray Roadside Rest Area,
Lorimor and Thayer.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4109 9436 4123 9427 4108 9388 4089 9406
TIME...MOT...LOC 0519Z 300DEG 31KT 4107 9420 

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

Curtis

464 
WWUS53 KDMX 190533
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
1233 AM CDT Sat Jun 19 2021

IAC001-159-190542-
/O.CAN.KDMX.SV.W.0026.000000T0000Z-210619T0545Z/
Ringgold IA-Adair IA-
1233 AM CDT Sat Jun 19 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN RINGGOLD AND
SOUTHEASTERN ADAIR 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 4108 9423 4120 9419 4108 9388 4096 9400
TIME...MOT...LOC 0532Z 300DEG 31KT 4101 9406 

$$

IAC039-121-175-190545-
/O.CON.KDMX.SV.W.0026.000000T0000Z-210619T0545Z/
Madison IA-Union IA-Clarke IA-
1233 AM CDT Sat Jun 19 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1245 AM CDT
FOR SOUTHERN MADISON...NORTHEASTERN UNION AND WEST CENTRAL CLARKE
COUNTIES...

At 1232 AM CDT, a severe thunderstorm was located 11 miles north of
Sun Valley Lake, or 14 miles west of Osceola, moving southeast 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...
Murray, Lorimor, Thayer and Murray Roadside Rest Area. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4108 9423 4120 9419 4108 9388 4096 9400
TIME...MOT...LOC 0532Z 300DEG 31KT 4101 9406 

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

Curtis

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, 11:55 PM CDT	Severe Thunderstorm Warning	DMX	Appanoose, Lucas, Monroe, Wayne	50 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.