Alert archive / Iowa / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 68, NWS Des Moines, IA

July 10, 20216 counties in Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Jul 10, 2021, 12:41 AM CDT for 6 counties in Iowa. It was in force for 64 min. 2 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: Jul 10, 2021, 12:41 AM CDT (05:41 UTC)
Expired: Jul 10, 2021, 1:45 AM CDT
In force: 64 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Adair County, IA, Adams County, IA, Cass County, IA, Ringgold County, IA, Taylor County, IA, Union County, IA

The radar

The Des Moines radar (KDMX), 133 km from the middle of the area, began a volume at 05:41 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
Jul 10, 1:14 AM CDT	TSTM WND DMG	1 S Nodaway, IA	DELAYED REPORT. 3-INCH TREE LIMBS BROKEN. POWER POLES BROKEN.
Jul 10, 1:40 AM CDT	TSTM WND GST 70	1 Ne Bedford, IA	RWIS SITE RBFI4 NEAR BEDFORD.

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

The watch it was issued in

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

Issued	Product	Office	Lasted
Jul 9, 9:58 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 5.7 hours before the alert went out and 149 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: 2603 J/kg
Mixed-layer CIN: -130 J/kg
Mixed-layer LCL: 1447 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 90 m²/s²
0-3 km storm-relative helicity: 186 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 8.1

Open this sounding in Storm Lab

The text

As transmitted.

471 
WUUS53 KDMX 100541
SVRDMX
IAC001-003-029-159-173-175-100645-
/O.NEW.KDMX.SV.W.0068.210710T0541Z-210710T0645Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Des Moines IA
1241 AM CDT Sat Jul 10 2021

The National Weather Service in Des Moines  has issued a

* Severe Thunderstorm Warning for...
  Southeastern Cass County in southwestern Iowa...
  Southwestern Union County in south central Iowa...
  Adams County in southwestern Iowa...
  Northwestern Ringgold County in south central Iowa...
  Taylor County in southwestern Iowa...
  Southwestern Adair County in southwestern Iowa...

* Until 145 AM CDT.

* At 1240 AM CDT, severe thunderstorms were located along a line
  extending from near Lake Icaria to near Stanton, moving southeast
  at 35 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Severe thunderstorms will be near...
  Lake Icaria around 1250 AM CDT.
  Corning around 1255 AM CDT.

Other locations in the path of these severe thunderstorms include
Lenox.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4058 9492 4073 9491 4073 9493 4111 9493
      4125 9465 4091 9411 4057 9447
TIME...MOT...LOC 0540Z 326DEG 30KT 4112 9479 4092 9512 

HAIL...<.75IN
WIND...60MPH
 
$$

Martin

3 follow-up statements

949 
WWUS53 KDMX 100605
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
105 AM CDT Sat Jul 10 2021

IAC001-003-029-159-173-175-100645-
/O.CON.KDMX.SV.W.0068.000000T0000Z-210710T0645Z/
Cass IA-Union IA-Adams IA-Ringgold IA-Taylor IA-Adair IA-
105 AM CDT Sat Jul 10 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 145 AM CDT
FOR SOUTHEASTERN CASS...SOUTHWESTERN UNION...ADAMS...NORTHWESTERN
RINGGOLD...TAYLOR AND SOUTHWESTERN ADAIR COUNTIES...

At 105 AM CDT, severe thunderstorms were located along a line
extending from near Corning to near Clarinda, moving southeast at 35
mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
  Lenox.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4058 9492 4073 9491 4073 9493 4111 9493
      4125 9465 4091 9411 4057 9447
TIME...MOT...LOC 0605Z 326DEG 30KT 4096 9465 4076 9498 

HAIL...<.75IN
WIND...60MPH
 
$$

Martin

170 
WWUS53 KDMX 100627
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
127 AM CDT Sat Jul 10 2021

IAC001-029-100636-
/O.CAN.KDMX.SV.W.0068.000000T0000Z-210710T0645Z/
Cass IA-Adair IA-
127 AM CDT Sat Jul 10 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN CASS AND
SOUTHWESTERN ADAIR COUNTIES IS CANCELLED...

The storms which prompted the warning have 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 4058 9492 4073 9491 4073 9493 4086 9493
      4115 9449 4091 9411 4057 9447
TIME...MOT...LOC 0626Z 324DEG 27KT 4085 9454 4065 9487 

$$

IAC003-159-173-175-100645-
/O.CON.KDMX.SV.W.0068.000000T0000Z-210710T0645Z/
Union IA-Adams IA-Ringgold IA-Taylor IA-
127 AM CDT Sat Jul 10 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 145 AM CDT
FOR SOUTHWESTERN UNION...SOUTHEASTERN ADAMS...NORTHWESTERN RINGGOLD
AND TAYLOR COUNTIES...

At 126 AM CDT, severe thunderstorms were located along a line
extending from near Lenox to 7 miles northwest of Hopkins, moving
southeast at 30 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Creston, Corning, Bedford, Lenox, New Market, Clearfield, Diagonal,
Prescott, Blockton, Gravity, Tingley, Cromwell, Arispe, Sharpsburg,
Shannon City, Kent, Conway, Benton, Maloy and Athelstan.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4058 9492 4073 9491 4073 9493 4086 9493
      4115 9449 4091 9411 4057 9447
TIME...MOT...LOC 0626Z 324DEG 27KT 4085 9454 4065 9487 

HAIL...<.75IN
WIND...60MPH
 
$$

Martin

201 
WWUS53 KDMX 100642
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
142 AM CDT Sat Jul 10 2021

IAC003-159-173-175-100652-
/O.EXP.KDMX.SV.W.0068.000000T0000Z-210710T0645Z/
Union IA-Adams IA-Ringgold IA-Taylor IA-
142 AM CDT Sat Jul 10 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN UNION...
SOUTHEASTERN ADAMS...NORTHWESTERN RINGGOLD AND TAYLOR COUNTIES WILL
EXPIRE AT 145 AM CDT...
            
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However gusty
winds are still possible with these thunderstorms.

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

LAT...LON 4058 9492 4073 9491 4073 9493 4086 9493
      4115 9449 4091 9411 4057 9447
TIME...MOT...LOC 0642Z 326DEG 30KT 4075 9445 4055 9478 

$$

Martin

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 9, 9:16 PM CDT	Severe Thunderstorm Warning	DMX	Ringgold	44 min
Jul 9, 9:31 PM CDT	Severe Thunderstorm Warning	DMX	Clarke, Decatur, Ringgold, Union	15 min
Jul 9, 9:38 PM CDT	Severe Thunderstorm Warning	DMX	Ringgold	52 min
Jul 9, 10:21 PM CDT	Severe Thunderstorm Warning	DMX	Ringgold	39 min
Jul 9, 11:41 PM CDT	Severe Thunderstorm Warning	DMX	Audubon, Cass	49 min
Jul 9, 11:56 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Adams, Cass	49 min
Jul 10, 2:49 PM CDT	Special Weather Statement	DMX	Carroll, Crawford, Sac	56 min
Jul 10, 4:36 PM CDT	Tornado Warning	DMX	Dallas, Guthrie	24 min
Jul 10, 5:00 PM CDT	Tornado Warning	DMX	Dallas	30 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.