Alert archive / Iowa / Tornado Warnings in 2021

Tornado Warning 22, NWS Des Moines, IA

July 14, 20214 counties in Iowa

NWS Des Moines, IA issued this tornado warning at Jul 14, 2021, 6:02 PM CDT for 4 counties in Iowa. It was in force for 43 min. 1 report 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 14, 2021, 6:02 PM CDT (23:02 UTC)
Expired: Jul 14, 2021, 6:45 PM CDT
In force: 43 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.0 in

Counties Black Hawk County, IA, Grundy County, IA, Marshall County, IA, Tama County, IA

The radar

The Des Moines radar (KDMX), 108 km from the middle of the area, began a volume at 23:04 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 14, 6:02 PM CDT	FUNNEL CLOUD	7 Ne Marshalltown, IA	MULTIPLE REPORTS OF FUNNEL CLOUD NEAR GREEN MOUNTAIN AROUND 170TH AND WALLACE AVE.

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 14, 2:35 PM CDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 11.0 hours before the alert went out and 180 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: 573 J/kg
Mixed-layer CIN: -62 J/kg
Mixed-layer LCL: 1106 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 108 m²/s²
0-3 km storm-relative helicity: 139 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.1

Open this sounding in Storm Lab

The text

As transmitted.

115 
WFUS53 KDMX 142302
TORDMX
IAC013-075-127-171-142345-
/O.NEW.KDMX.TO.W.0022.210714T2302Z-210714T2345Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Des Moines IA
602 PM CDT Wed Jul 14 2021

The National Weather Service in Des Moines  has issued a

* Tornado Warning for...
  Northeastern Marshall County in central Iowa...
  Southwestern Black Hawk County in northeastern Iowa...
  Northern Tama County in central Iowa...
  South central Grundy County in central Iowa...

* Until 645 PM CDT.

* At 602 PM CDT, a severe thunderstorm capable of producing a tornado
  was located 7 miles southeast of Conrad, or 10 miles northeast of
  Marshalltown, moving east at 50 mph.

  HAZARD...Tornado and quarter size hail.

  SOURCE...Weather spotters reported funnel cloud.

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely.

* This dangerous storm will be near...
  Traer around 620 PM CDT.

Other locations in the path of this tornadic thunderstorm include
Dysart.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 4208 9283 4221 9284 4231 9243 4220 9232
      4212 9230 4209 9230
TIME...MOT...LOC 2302Z 248DEG 42KT 4216 9277 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

Fowle

3 follow-up statements

782 
WWUS53 KDMX 142312
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
612 PM CDT Wed Jul 14 2021

IAC013-075-127-171-142345-
/O.CON.KDMX.TO.W.0022.000000T0000Z-210714T2345Z/
Marshall IA-Black Hawk IA-Tama IA-Grundy IA-
612 PM CDT Wed Jul 14 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 645 PM CDT FOR
NORTHEASTERN MARSHALL...SOUTHWESTERN BLACK HAWK...NORTHERN TAMA AND
SOUTH CENTRAL GRUNDY COUNTIES...
        
At 612 PM CDT, a severe thunderstorm capable of producing a tornado
was located 10 miles west of Traer, or 13 miles north of Toledo,
moving east at 35 mph.

HAZARD...Tornado and quarter size hail.

SOURCE...Weather spotters reported a funnel cloud.

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely.

Locations impacted include...
Traer, Dysart, Gladbrook, Garwin, Green Mountain, Tf Clark State Park
and Union Grove State Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 4231 9243 4220 9232 4212 9230 4209 9230
      4208 9283 4221 9284
TIME...MOT...LOC 2312Z 254DEG 32KT 4218 9266 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

Fowle

220 
WWUS53 KDMX 142324
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
624 PM CDT Wed Jul 14 2021

IAC075-127-142334-
/O.CAN.KDMX.TO.W.0022.000000T0000Z-210714T2345Z/
Marshall IA-Grundy IA-
624 PM CDT Wed Jul 14 2021

...THE TORNADO WARNING FOR NORTHEASTERN MARSHALL AND SOUTH CENTRAL
GRUNDY COUNTIES IS CANCELLED...
    
The tornadic thunderstorm which prompted the warning has moved out 
of the warned area. Therefore, the warning has been cancelled.

A Tornado Watch remains in effect until 900 PM CDT for central and
northeastern Iowa.

LAT...LON 4231 9243 4220 9232 4212 9230 4209 9230
      4208 9271 4224 9273
TIME...MOT...LOC 2324Z 262DEG 41KT 4212 9261 

$$

IAC013-171-142345-
/O.CON.KDMX.TO.W.0022.000000T0000Z-210714T2345Z/
Black Hawk IA-Tama IA-
624 PM CDT Wed Jul 14 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 645 PM CDT FOR
SOUTHWESTERN BLACK HAWK AND NORTHERN TAMA COUNTIES...
    
At 624 PM CDT, a severe thunderstorm capable of producing a tornado
was located 8 miles southwest of Traer, or 9 miles north of Toledo,
moving east at 45 mph.

HAZARD...Tornado and quarter size hail.

SOURCE...Radar indicated rotation.

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely.

Locations impacted include...
Traer, Dysart, Gladbrook, Garwin and Tf Clark State Park. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 4231 9243 4220 9232 4212 9230 4209 9230
      4208 9271 4224 9273
TIME...MOT...LOC 2324Z 262DEG 41KT 4212 9261 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

Fowle

370 
WWUS53 KDMX 142345
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
645 PM CDT Wed Jul 14 2021

IAC013-171-142355-
/O.EXP.KDMX.TO.W.0022.000000T0000Z-210714T2345Z/
Black Hawk IA-Tama IA-
645 PM CDT Wed Jul 14 2021

...THE TORNADO WARNING FOR SOUTHWESTERN BLACK HAWK AND NORTHERN TAMA
COUNTIES HAS EXPIRED...
    
The tornado threat has diminished and the Tornado Warning has been
cancelled. However, large hail and damaging winds remain likely and 
a Severe Thunderstorm Warning remains in effect for the area.  

A Tornado Watch remains in effect until 900 PM CDT for central and 
northeastern Iowa.

LAT...LON 4231 9243 4220 9232 4212 9230 4209 9230
      4208 9271 4224 9273
TIME...MOT...LOC 2345Z 266DEG 29KT 4219 9246 

$$

Fowle

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 14, 7:17 AM CDT	Special Weather Statement	DMX	Emmet, Humboldt, Kossuth, Palo Alto, Pocahontas	58 min
Jul 14, 8:08 AM CDT	Severe Thunderstorm Warning	DMX	Kossuth, Winnebago	52 min
Jul 14, 8:24 AM CDT	Special Weather Statement	DMX	Butler, Cerro Gordo, Franklin, Hancock, Winnebago, Worth	66 min
Jul 14, 8:39 AM CDT	Severe Thunderstorm Warning	DMX	Butler, Cerro Gordo, Franklin, Grundy, Hancock, Hardin and 1 more	66 min
Jul 14, 8:43 AM CDT	Severe Thunderstorm Warning	DMX	Cerro Gordo, Hancock, Winnebago, Worth	62 min
Jul 14, 8:49 AM CDT	Severe Thunderstorm Warning	DMX	Grundy, Hardin, Marshall, Story, Tama	56 min
Jul 14, 9:40 AM CDT	Special Weather Statement	DMX	Black Hawk, Bremer, Tama	65 min
Jul 14, 3:55 PM CDT	Tornado Warning	DMX	Calhoun, Carroll, Greene	35 min
Jul 14, 4:04 PM CDT	Tornado Warning	DMX	Boone, Hamilton, Story, Webster	41 min
Jul 14, 4:23 PM CDT	Tornado Warning	DMX	Franklin, Hamilton, Hardin, Wright	37 min
Jul 14, 4:29 PM CDT	Tornado Warning Tornado observed	DMX	Calhoun, Greene, Webster	31 min
Jul 14, 4:29 PM CDT	Tornado Warning Tornado observed	DMX	Hamilton, Hardin	31 min
Jul 14, 4:30 PM CDT	Tornado Warning	DMX	Butler	30 min
Jul 14, 4:35 PM CDT	Tornado Warning	DMX	Franklin, Hardin	40 min
Jul 14, 4:53 PM CDT	Tornado Warning	DMX	Bremer, Butler	37 min
Jul 14, 4:56 PM CDT	Tornado Warning Tornado observed	DMX	Hamilton, Hardin	25 min
Jul 14, 5:00 PM CDT	Tornado Warning	DMX	Hamilton, Hardin, Story	25 min
Jul 14, 5:18 PM CDT	Severe Thunderstorm Warning	DMX	Black Hawk, Bremer, Butler	42 min
Jul 14, 5:18 PM CDT	Severe Thunderstorm Warning	DMX	Grundy, Hardin	42 min
Jul 14, 5:23 PM CDT	Tornado Warning Tornado observed	DMX	Black Hawk, Bremer, Butler	37 min
Jul 14, 5:49 PM CDT	Severe Thunderstorm Warning	DMX	Black Hawk, Bremer, Butler, Grundy	41 min
Jul 14, 5:50 PM CDT	Tornado Warning	DMX	Cerro Gordo	25 min
Jul 14, 5:53 PM CDT	Tornado Warning Tornado observed	DMX	Black Hawk, Bremer	37 min
Jul 14, 5:58 PM CDT	Tornado Warning	DMX	Calhoun	47 min
Jul 14, 6:42 PM CDT	Severe Thunderstorm Warning	DMX	Tama	48 min
Jul 14, 6:42 PM CDT	Tornado Warning	DMX	Webster	36 min
Jul 14, 6:55 PM CDT	Tornado Warning	DMX	Tama	19 min

Nearby

Tornado Warnings in Iowa, 2021 Every tornado warning in 2021 Tornadoes 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.