Alert archive / Iowa / Tornado Warnings in 2021

Tornado Warning 21, NWS Des Moines, IA

July 14, 2021Calhoun County, Iowa

NWS Des Moines, IA issued this tornado warning at Jul 14, 2021, 5:58 PM CDT for Calhoun County, Iowa. It was in force for 47 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, 5:58 PM CDT (22:58 UTC)
Expired: Jul 14, 2021, 6:45 PM CDT
In force: 47 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

County Calhoun County, IA

The radar

The Des Moines radar (KDMX), 105 km from the middle of the area, began a volume at 22:57 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, 11.0 hours before the alert went out and 192 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.

682 
WFUS53 KDMX 142258
TORDMX
IAC025-142345-
/O.NEW.KDMX.TO.W.0021.210714T2258Z-210714T2345Z/

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

The National Weather Service in Des Moines  has issued a

* Tornado Warning for...
  Calhoun County in west central Iowa...

* Until 645 PM CDT.
    
* At 557 PM CDT, a severe thunderstorm capable of producing a tornado
  was located over Rockwell City, moving east at 25 mph.

  HAZARD...Tornado.

  SOURCE...Radar indicated rotation. At 553 PM a storm chaser 
           reported a funnel cloud southwest of Lytton.

  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...
  Rockwell City, North Twin Lake, South Twin Lake, Farnhamville,
  Lohrville, Twin Lakes, Somers, Knierim, Rinard, Twin Lakes State
  Park and Rockwell City 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 4250 9466 4250 9444 4247 9444 4247 9440
      4221 9440 4235 9486 4236 9486
TIME...MOT...LOC 2257Z 272DEG 23KT 4239 9464 

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

$$

Small

2 follow-up statements

403 
WWUS53 KDMX 142314
SVSDMX

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

IAC025-142345-
/O.CON.KDMX.TO.W.0021.000000T0000Z-210714T2345Z/
Calhoun IA-
614 PM CDT Wed Jul 14 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 645 PM CDT FOR
SOUTHEASTERN CALHOUN COUNTY...
    
At 614 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Rockwell City, moving east at 20 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.

Locations impacted include...
Rockwell City, Farnhamville, Lohrville, Somers, Knierim, Rinard and
Rockwell City 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 4246 9462 4247 9440 4221 9440 4233 9478
TIME...MOT...LOC 2314Z 289DEG 16KT 4236 9455 

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

$$

Small

071 
WWUS53 KDMX 142344
SVSDMX

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

IAC025-142354-
/O.EXP.KDMX.TO.W.0021.000000T0000Z-210714T2345Z/
Calhoun IA-
644 PM CDT Wed Jul 14 2021

...THE TORNADO WARNING FOR SOUTHEASTERN CALHOUN COUNTY WILL EXPIRE AT
645 PM CDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.

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

LAT...LON 4246 9462 4247 9440 4221 9440 4233 9478
TIME...MOT...LOC 2344Z 272DEG 23KT 4235 9431 

$$

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, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.