Alert archive / Iowa / Tornado Warnings in 2021

Tornado Warning 15, NWS Des Moines, IA

July 14, 2021Bremer County, Butler County, Iowa

NWS Des Moines, IA issued this tornado warning at Jul 14, 2021, 4:53 PM CDT for Bremer County, Butler County, Iowa. It was in force for 37 min. 10 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 14, 2021, 4:53 PM CDT (21:53 UTC)
Expired: Jul 14, 2021, 5:30 PM CDT
In force: 37 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.0 in

Counties Bremer County, IA, Butler County, IA

The radar

The Des Moines radar (KDMX), 146 km from the middle of the area, began a volume at 21:51 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, 5:14 PM CDT	HAIL 1.25	Clarksville, IA
Jul 14, 5:16 PM CDT	TORNADO	2 Ssw Shell Rock, IA	DAMAGE BEGINS AROUND 250TH AND WILLOW AVENUE. HOUSES DAMAGED. GRAIN BINS DAMAGED. POWER LINES DOWN. DAMAGE PARALLELED 250TH EAST.
Jul 14, 5:18 PM CDT	TORNADO	1 Ne Shell Rock, IA	KGAN METEOROLOGIST REPORTS TORNADO NEAR SHELL ROCK.
Jul 14, 5:19 PM CDT	TORNADO	1 E Shell Rock, IA	NO DAMAGE SEEN YET.
Jul 14, 5:19 PM CDT	TORNADO	2 S Shell Rock, IA	DAMAGE TO TREES AND A HOME NEAR 250TH AND WOODS AVE. REPORT COURTESY IOWAS NEWS NOW. TIME ESTIMATED BY RADAR.
Jul 14, 5:21 PM CDT	TORNADO	2 Ene Shell Rock, IA	REPORT VIA SOCIAL MEDIA. PHOTOS AND VIDEOS REPORTED.
Jul 14, 5:25 PM CDT	TORNADO	2 Sw Waverly, IA	TORNADO REPORTED NEAR THE INTERSECTION OF 240TH ST AND HWY 218. TORNADO HEADING EAST.
Jul 14, 5:28 PM CDT	TORNADO	1 S Shell Rock, IA	SIGNIFICANT TREE DAMAGE AND LIGHT STRUCTURE DAMAGE.
Jul 14, 5:35 PM CDT	TORNADO	2 S Waverly, IA	TORNADO ON THE GROUND. DEBRIS BEING LOFTED INTO THE AIR.
Jul 14, 5:37 PM CDT	TORNADO	2 S Waverly, IA	REPORT VIA SOCIAL MEDIA.

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, 9.9 hours before the alert went out and 219 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.

750 
WFUS53 KDMX 142153
TORDMX
IAC017-023-142230-
/O.NEW.KDMX.TO.W.0015.210714T2153Z-210714T2230Z/

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

The National Weather Service in Des Moines  has issued a

* Tornado Warning for...
  Western Bremer County in northeastern Iowa...
  Northeastern Butler County in north central Iowa...

* Until 530 PM CDT.
    
* At 453 PM CDT, a severe thunderstorm capable of producing a tornado
  was located near Allison, moving east at 30 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.

* This dangerous storm will be near...
  Clarksville around 500 PM CDT.
  Shell Rock around 510 PM CDT.

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

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 4266 9284 4276 9287 4290 9257 4291 9250
      4291 9248 4265 9246
TIME...MOT...LOC 2153Z 256DEG 26KT 4274 9273 

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

$$

Krull

3 follow-up statements

312 
WWUS53 KDMX 142208
SVSDMX

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

IAC017-023-142230-
/O.CON.KDMX.TO.W.0015.000000T0000Z-210714T2230Z/
Bremer IA-Butler IA-
508 PM CDT Wed Jul 14 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 530 PM CDT FOR WESTERN
BREMER AND EAST CENTRAL BUTLER COUNTIES...
    
At 508 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Clarksville, or 8 miles east of Allison, moving east
at 25 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...
  Waverly.

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 4266 9273 4279 9275 4287 9256 4290 9248
      4265 9246
TIME...MOT...LOC 2208Z 271DEG 23KT 4276 9263 

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

$$

Krull

876 
WWUS53 KDMX 142215
SVSDMX

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

IAC017-023-142230-
/O.CON.KDMX.TO.W.0015.000000T0000Z-210714T2230Z/
Bremer IA-Butler IA-
515 PM CDT Wed Jul 14 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 530 PM CDT FOR WESTERN
BREMER AND EAST CENTRAL BUTLER COUNTIES...
    
At 514 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Shell Rock, or near Waverly, moving east at 30 mph.

HAZARD...Tornado and half dollar size hail.

SOURCE...Radar indicated rotation. A trained spotter reported half-
         dollar size hail in Clarkesville at 513 PM.

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...
Waverly, Clarksville, Shell Rock, Janesville, Plainfield and Waverly
Municipal Airport.

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 4266 9267 4279 9269 4290 9248 4265 9246
TIME...MOT...LOC 2214Z 256DEG 26KT 4277 9257 

TORNADO...RADAR INDICATED
HAIL...1.25IN

$$

Krull

714 
WWUS53 KDMX 142221
SVSDMX

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

IAC017-023-142230-
/O.CON.KDMX.TO.W.0015.000000T0000Z-210714T2230Z/
Bremer IA-Butler IA-
521 PM CDT Wed Jul 14 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 530 PM CDT FOR
SOUTHWESTERN BREMER AND EAST CENTRAL BUTLER COUNTIES...
    
At 521 PM CDT, a confirmed tornado was located over Waverly, moving
east at 45 mph.

HAZARD...Damaging tornado and half dollar size hail.

SOURCE...Weather spotters confirmed tornado.

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...
Waverly, Shell Rock, Janesville and Waverly Municipal Airport. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To repeat, a tornado is on the ground. 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 4266 9263 4280 9263 4286 9248 4265 9246
TIME...MOT...LOC 2221Z 259DEG 38KT 4273 9252 

TORNADO...OBSERVED
HAIL...1.25IN

$$

Krull

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, 4:56 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, 6:02 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.