Alert archive / Iowa / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 8, NWS Des Moines, IA

June 16, 2021Carroll County, Crawford County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Jun 16, 2021, 9:39 PM CDT for Carroll County, Crawford County, Iowa. It was in force for 51 min. 5 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 16, 2021, 9:39 PM CDT (02:39 UTC)
Expired: Jun 16, 2021, 10:30 PM CDT
In force: 51 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Hail: 1.75 in
Wind: 60.0 mph

Counties Carroll County, IA, Crawford County, IA

The radar

The Des Moines radar (KDMX), 121 km from the middle of the area, began a volume at 02:38 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 16, 10:02 PM CDT	TSTM WND GST 59	2 Nnw Carroll, IA	PERSONAL WEATHER STATION KIACARRO21.
Jun 16, 10:17 PM CDT	TSTM WND DMG	Templeton, IA	MOSTLY 2-3 INCH BRANCHES DOWN WITH A COUPLE UP TO 6 INCHES. FLAG POLE BLOWN OVER.
Jun 16, 10:17 PM CDT	TSTM WND DMG	Templeton, IA	UPDATE TO PREVIOUS STORM REPORT. LARGE TREE DOWN ON HOUSE AND GARAGE. OTHER TREE DOWN AND TOOK POWER LINES DOWN. FLAG POLE BLOWN OVER.
Jun 16, 10:19 PM CDT	TSTM WND GST 62	2 S Willey, IA	PERSONAL WEATHER STATION KIACARRO16.
Jun 16, 10:32 PM CDT	TSTM WND DMG	4 Wnw Manilla, IA	TREE BLOCKING IA-141 EAST OF US 59.

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, 2.7 hours before the alert went out and 134 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: 2997 J/kg
Mixed-layer CIN: -144 J/kg
Mixed-layer LCL: 1946 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 120 m²/s²
0-3 km storm-relative helicity: 435 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 27.9

Open this sounding in Storm Lab

The text

As transmitted.

406 
WUUS53 KDMX 170239
SVRDMX
IAC027-047-170330-
/O.NEW.KDMX.SV.W.0008.210617T0239Z-210617T0330Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Des Moines IA
939 PM CDT Wed Jun 16 2021

The National Weather Service in Des Moines  has issued a

* Severe Thunderstorm Warning for...
  Crawford County in west central Iowa...
  Carroll County in west central Iowa...

* Until 1030 PM CDT.

* At 938 PM CDT, a severe thunderstorm was located near Odebolt, or
  15 miles southeast of Ida Grove, moving south at 45 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.

* This severe thunderstorm will be near...
  Manning around 1005 PM CDT.

Other locations impacted by this severe thunderstorm include Kiron,
Deloit, Breda, Vail, Dow City, Willey, Manning Municipal Airport,
Halbur, Schleswig and Denison Municipal Airport.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for large hail and damaging winds. People outside
should move immediately to shelter inside a strong building. Stay
away from windows.

&&

LAT...LON 4221 9488 4186 9474 4186 9549 4221 9558
TIME...MOT...LOC 0238Z 349DEG 41KT 4222 9521 

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

Small

2 follow-up statements

652 
WWUS53 KDMX 170251
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
951 PM CDT Wed Jun 16 2021

IAC027-047-170330-
/O.CON.KDMX.SV.W.0008.000000T0000Z-210617T0330Z/
Crawford IA-Carroll IA-
951 PM CDT Wed Jun 16 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1030 PM CDT
FOR CRAWFORD AND CARROLL COUNTIES...

At 950 PM CDT, a severe thunderstorm was located 13 miles south of
Black Hawk Lake, or 13 miles west of Carroll, moving south at 45 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 storm will be near...
  Manning around 1010 PM CDT.

Other locations impacted by this severe thunderstorm include Kiron,
Deloit, Breda, Vail, Dow City, Willey, Manning Municipal Airport,
Halbur, Schleswig and Denison Municipal Airport.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for large hail and damaging winds. People outside
should move to a shelter, inside a strong building and away from
windows.

&&

LAT...LON 4221 9488 4186 9474 4186 9549 4221 9558
TIME...MOT...LOC 0250Z 337DEG 40KT 4212 9512 

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

Small

183 
WWUS53 KDMX 170331
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
1031 PM CDT Wed Jun 16 2021

IAC027-047-170340-
/O.EXP.KDMX.SV.W.0008.000000T0000Z-210617T0330Z/
Crawford IA-Carroll IA-
1031 PM CDT Wed Jun 16 2021

...THE SEVERE THUNDERSTORM WARNING FOR CRAWFORD AND CARROLL COUNTIES
HAS EXPIRED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been allowed to expire.  However gusty 
winds to 50 mph are still possible with this thunderstorm and in its 
wake, even after the precipitation has ended.

A Severe Thunderstorm Watch remains in effect until 200 AM CDT for
west central Iowa.

LAT...LON 4221 9488 4186 9474 4186 9549 4221 9558
TIME...MOT...LOC 0330Z 349DEG 41KT 4168 9501 

$$

Small

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 16, 8:57 PM CDT	Severe Thunderstorm Warning	DMX	Calhoun, Sac	63 min
Jun 16, 10:18 PM CDT	Special Weather Statement	DMX	Audubon, Guthrie	42 min
Jun 16, 10:23 PM CDT	Severe Thunderstorm Warning	DMX	Audubon, Carroll, Greene, Guthrie	53 min
Jun 16, 10:53 PM CDT	Special Weather Statement	DMX	Adair, Cass, Madison	52 min
Jun 16, 11:31 PM CDT	Special Weather Statement	DMX	Adams, Ringgold, Taylor, Union	59 min
Jun 17, 2:54 PM CDT	Special Weather Statement	DMX	Cerro Gordo, Hancock, Winnebago, Worth	66 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.