Alert archive / Iowa / Tornado Warnings in 2021

Tornado Warning 17, NWS Des Moines, IA

July 14, 2021Hamilton County, Hardin County, Story County, Iowa

NWS Des Moines, IA issued this tornado warning at Jul 14, 2021, 5:00 PM CDT for Hamilton County, Hardin County, Story County, Iowa. It was in force for 25 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, 5:00 PM CDT (22:00 UTC)
Expired: Jul 14, 2021, 5:25 PM CDT
In force: 25 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Hamilton County, IA, Hardin County, IA, Story County, IA

The radar

The Des Moines radar (KDMX), 58 km from the middle of the area, began a volume at 21:58 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, 5:09 PM CDT	TORNADO	5 Sse Radcliffe, IA	CONFIRMED TORNADO AND DAMAGE IN GARDEN CITY. TIME ESTIMATED FROM RADAR.

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, 10.0 hours before the alert went out and 252 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.

812 
WFUS53 KDMX 142200
TORDMX
IAC079-083-169-142245-
/O.NEW.KDMX.TO.W.0017.210714T2200Z-210714T2245Z/

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

The National Weather Service in Des Moines  has issued a

* Tornado Warning for...
  Northeastern Story County in central Iowa...
  Southwestern Hardin County in central Iowa...
  Southeastern Hamilton County in central Iowa...

* Until 545 PM CDT.
    
* At 459 PM CDT, a severe thunderstorm capable of producing a tornado
  was located over Story City, or 13 miles north of Ames, moving
  northeast at 35 mph.

  HAZARD...Tornado.

  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.

* This tornadic thunderstorm will remain over mainly rural areas of
  northeastern Story, southwestern Hardin and southeastern Hamilton
  Counties, including the following locations... Zearing, Radcliffe,
  Garden City, Hubbard, McCallsburg, Drake Airport and Randall.

This includes Interstate 35 between mile markers 122 and 130.
 
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 4214 9360 4224 9365 4237 9331 4218 9323
      4216 9323
TIME...MOT...LOC 2159Z 245DEG 29KT 4221 9355 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

Fowle

3 follow-up statements

602 
WWUS53 KDMX 142205
SVSDMX

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

IAC079-083-169-142245-
/O.CON.KDMX.TO.W.0017.000000T0000Z-210714T2245Z/
Story IA-Hardin IA-Hamilton IA-
505 PM CDT Wed Jul 14 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 545 PM CDT FOR
NORTHEASTERN STORY...SOUTHWESTERN HARDIN AND SOUTHEASTERN HAMILTON
COUNTIES...
    
At 505 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Roland, or 14 miles north of Nevada, moving
northeast at 35 mph.

HAZARD...Tornado.

SOURCE...Radar indicated rotation. This storm continues to exhibit 
         strong rotation and a wall 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...
Roland, Hubbard, Zearing, Radcliffe, McCallsburg, Garden City and
Drake Airport.

This includes Interstate 35 between mile markers 129 and 130.
 
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 4215 9353 4226 9358 4237 9331 4218 9323
      4216 9323
TIME...MOT...LOC 2205Z 245DEG 29KT 4223 9349 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

Fowle

394 
WWUS53 KDMX 142218
SVSDMX

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

IAC079-169-142227-
/O.CAN.KDMX.TO.W.0017.000000T0000Z-210714T2245Z/
Story IA-Hamilton IA-
518 PM CDT Wed Jul 14 2021

...THE TORNADO WARNING FOR NORTHEASTERN STORY AND SOUTHEASTERN
HAMILTON 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 Iowa.

LAT...LON 4225 9336 4229 9340 4237 9331 4222 9325
TIME...MOT...LOC 2217Z 249DEG 34KT 4228 9334 

$$

IAC083-142245-
/O.CON.KDMX.TO.W.0017.000000T0000Z-210714T2245Z/
Hardin IA-
518 PM CDT Wed Jul 14 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 545 PM CDT FOR
SOUTHWESTERN HARDIN COUNTY...
    
At 517 PM CDT, a severe thunderstorm capable of producing a tornado
was located 11 miles northeast of Roland, or 13 miles southwest of
Eldora, moving east at 40 mph.

HAZARD...Tornado and golf ball 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...
Hubbard.

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 4225 9336 4229 9340 4237 9331 4222 9325
TIME...MOT...LOC 2217Z 249DEG 34KT 4228 9334 

TORNADO...RADAR INDICATED
HAIL...1.75IN

$$

Small

340 
WWUS53 KDMX 142225
SVSDMX

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

IAC083-142235-
/O.CAN.KDMX.TO.W.0017.000000T0000Z-210714T2245Z/
Hardin IA-
525 PM CDT Wed Jul 14 2021

...THE TORNADO WARNING FOR SOUTHWESTERN HARDIN COUNTY IS CANCELLED...
    
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.  However
small hail and gusty winds are still possible with this thunderstorm.

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

LAT...LON 4225 9336 4229 9340 4237 9331 4222 9325
TIME...MOT...LOC 2224Z 245DEG 29KT 4231 9326 

$$

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, 5:18 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, 6:02 PM CDT	Tornado Warning	DMX	Black Hawk, Grundy, Marshall, Tama	43 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.