Alert archive / Iowa / Tornado Warnings in 2021

Tornado Warning 23, NWS Des Moines, IA

July 14, 2021Webster County, Iowa

NWS Des Moines, IA issued this tornado warning at Jul 14, 2021, 6:42 PM CDT for Webster County, Iowa. It was in force for 36 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 14, 2021, 6:42 PM CDT (23:42 UTC)
Expired: Jul 14, 2021, 7:18 PM CDT
In force: 36 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

County Webster County, IA

The radar

The Des Moines radar (KDMX), 70 km from the middle of the area, began a volume at 23:43 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.

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

Omaha, NE (KOAX), launched 12:00Z, 11.7 hours before the alert went out and 213 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: 967 J/kg
Mixed-layer CIN: -125 J/kg
Mixed-layer LCL: 1201 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 35 m²/s²
0-3 km storm-relative helicity: -7 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.1

Open this sounding in Storm Lab

The text

As transmitted.

909 
WFUS53 KDMX 142342
TORDMX
IAC187-150030-
/O.NEW.KDMX.TO.W.0023.210714T2342Z-210715T0030Z/

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

The National Weather Service in Des Moines  has issued a

* Tornado Warning for...
  Southern Webster County in central Iowa...

* Until 730 PM CDT.
    
* At 642 PM CDT, a severe thunderstorm capable of producing a tornado
  was located near Gowrie, or 15 miles southeast of Rockwell City,
  moving east 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 dangerous storm will be near...
  Gowrie around 650 PM CDT.

Other locations impacted by this tornadic thunderstorm include
Harcourt, Dayton, Stratford and Farnhamville.

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 4232 9393 4221 9393 4221 9425 4227 9440
      4235 9440
TIME...MOT...LOC 2342Z 284DEG 30KT 4230 9435 

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

$$

Small

2 follow-up statements

502 
WWUS53 KDMX 150001
SVSDMX

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

IAC187-150030-
/O.CON.KDMX.TO.W.0023.000000T0000Z-210715T0030Z/
Webster IA-
701 PM CDT Wed Jul 14 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 730 PM CDT FOR
SOUTHEASTERN WEBSTER COUNTY...
    
At 700 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Gowrie, or 15 miles south of Fort Dodge, moving east
at 30 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
southeastern Webster County, including the following locations...
Dayton, Harcourt and Stratford.

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 4232 9393 4221 9393 4225 9420 4229 9423
      4232 9421
TIME...MOT...LOC 0000Z 277DEG 27KT 4229 9417 

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

$$

Small

250 
WWUS53 KDMX 150018
SVSDMX

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

IAC187-150028-
/O.CAN.KDMX.TO.W.0023.000000T0000Z-210715T0030Z/
Webster IA-
718 PM CDT Wed Jul 14 2021

...THE TORNADO WARNING FOR SOUTHEASTERN WEBSTER COUNTY IS
CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore, the warning has been cancelled.

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

LAT...LON 4232 9393 4221 9393 4225 9420 4229 9423
      4232 9421
TIME...MOT...LOC 0016Z 284DEG 30KT 4225 9397 

$$

Small

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, 6:02 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, 6:55 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.