Alert archive / Iowa / Tornado Warnings in 2021

Tornado Warning 6, NWS Des Moines, IA

July 10, 2021Dallas County, Guthrie County, Iowa

NWS Des Moines, IA issued this tornado warning at Jul 10, 2021, 4:36 PM CDT for Dallas County, Guthrie County, Iowa. It was in force for 24 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 10, 2021, 4:36 PM CDT (21:36 UTC)
Expired: Jul 10, 2021, 5:00 PM CDT
In force: 24 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Dallas County, IA, Guthrie County, IA

The radar

The Des Moines radar (KDMX), 41 km from the middle of the area, began a volume at 21:37 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 nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 9.6 hours before the alert went out and 187 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 976 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: -6 m²/s²
0-3 km storm-relative helicity: 53 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

269 
WFUS53 KDMX 102136
TORDMX
IAC049-077-102200-
/O.NEW.KDMX.TO.W.0006.210710T2136Z-210710T2200Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Des Moines IA
436 PM CDT Sat Jul 10 2021

The National Weather Service in Des Moines  has issued a

* Tornado Warning for...
  Southeastern Guthrie County in west central Iowa...
  Southwestern Dallas County in central Iowa...

* Until 500 PM CDT.
    
* At 435 PM CDT, a severe thunderstorm capable of producing a tornado
  was located near Earlham, or 10 miles west of Adel, moving east at
  25 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...
  Adel and De Soto.

This includes Interstate 80 between mile markers 107 and 111.
 
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 4152 9425 4157 9426 4165 9402 4152 9398
TIME...MOT...LOC 2135Z 255DEG 22KT 4156 9421 

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

$$

Hagenhoff

1 follow-up statement

112 
WWUS53 KDMX 102146
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
446 PM CDT Sat Jul 10 2021

IAC077-102156-
/O.CAN.KDMX.TO.W.0006.000000T0000Z-210710T2200Z/
Guthrie IA-
446 PM CDT Sat Jul 10 2021

...THE TORNADO WARNING FOR SOUTHEASTERN GUTHRIE COUNTY IS
CANCELLED...
    
The tornadic thunderstorm which prompted the warning has moved out 
of the warned area. Therefore, the warning has been cancelled.

LAT...LON 4154 9415 4160 9417 4165 9402 4156 9399
TIME...MOT...LOC 2146Z 255DEG 22KT 4158 9412 

$$

IAC049-102200-
/O.CON.KDMX.TO.W.0006.000000T0000Z-210710T2200Z/
Dallas IA-
446 PM CDT Sat Jul 10 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 500 PM CDT FOR
SOUTHWESTERN DALLAS COUNTY...
    
At 446 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Earlham, or near Adel, moving east at 25 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...
Adel.

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 4154 9415 4160 9417 4165 9402 4156 9399
TIME...MOT...LOC 2146Z 255DEG 22KT 4158 9412 

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

$$

Hagenhoff

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 9, 9:16 PM CDT	Severe Thunderstorm Warning	DMX	Ringgold	44 min
Jul 9, 9:31 PM CDT	Severe Thunderstorm Warning	DMX	Clarke, Decatur, Ringgold, Union	15 min
Jul 9, 9:38 PM CDT	Severe Thunderstorm Warning	DMX	Ringgold	52 min
Jul 9, 10:21 PM CDT	Severe Thunderstorm Warning	DMX	Ringgold	39 min
Jul 9, 11:41 PM CDT	Severe Thunderstorm Warning	DMX	Audubon, Cass	49 min
Jul 9, 11:56 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Adams, Cass	49 min
Jul 10, 12:41 AM CDT	Severe Thunderstorm Warning	DMX	Adair, Adams, Cass, Ringgold, Taylor, Union	64 min
Jul 10, 2:49 PM CDT	Special Weather Statement	DMX	Carroll, Crawford, Sac	56 min
Jul 10, 5:00 PM CDT	Tornado Warning	DMX	Dallas	30 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.