Alert archive / Iowa / Tornado Warnings in 2022

Tornado Warning 13, NWS Omaha, NE

April 23, 2022Montgomery County, Iowa

NWS Omaha, NE issued this tornado warning at Apr 23, 2022, 4:45 PM CDT for Montgomery County, Iowa. It was in force for 13 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: Apr 23, 2022, 4:45 PM CDT (21:45 UTC)
Expired: Apr 23, 2022, 4:58 PM CDT
In force: 13 min
Issued by: NWS Omaha, NE
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.0 in

County Montgomery County, IA

The radar

The Omaha radar (KOAX), 115 km from the middle of the area, began a volume at 21:46 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
Apr 23, 4:01 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 9.8 hours before the alert went out and 115 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: 12 J/kg
Mixed-layer CIN: -305 J/kg
Mixed-layer LCL: 1065 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 292 m²/s²
0-3 km storm-relative helicity: 348 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

857 
WFUS53 KOAX 232145
TOROAX
IAC137-232215-
/O.NEW.KOAX.TO.W.0013.220423T2145Z-220423T2215Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Omaha/Valley Nebraska
445 PM CDT Sat Apr 23 2022

The National Weather Service in Omaha has issued a

* Tornado Warning for...
  Eastern Montgomery County in southwestern Iowa...

* Until 515 PM CDT.
    
* At 445 PM CDT, a severe thunderstorm capable of producing a tornado
  was located over Stanton, or 19 miles west of Corning, moving
  northeast at 55 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 tornadic thunderstorm will remain over mainly rural areas of
  eastern Montgomery County, including the following locations...
  Grant and Viking Lake State Park.

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 4090 9511 4091 9519 4105 9512 4116 9501
      4116 9493 4103 9493
TIME...MOT...LOC 2145Z 212DEG 48KT 4095 9511 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...1.00 IN

$$

CA

2 follow-up statements

695 
WWUS53 KOAX 232152
SVSOAX

Severe Weather Statement
National Weather Service Omaha/Valley Nebraska
452 PM CDT Sat Apr 23 2022

IAC137-232215-
/O.CON.KOAX.TO.W.0013.000000T0000Z-220423T2215Z/
Montgomery IA-
452 PM CDT Sat Apr 23 2022

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 515 PM CDT FOR EASTERN
MONTGOMERY COUNTY...
    
At 451 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Stanton, or 16 miles west of Corning, moving
northeast at 55 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...
Grant and Viking Lake State Park. 

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 4095 9504 4098 9509 4105 9512 4116 9501
      4116 9493 4103 9493
TIME...MOT...LOC 2151Z 212DEG 46KT 4101 9506 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...1.00 IN

$$

CA

377 
WWUS53 KOAX 232158
SVSOAX

Severe Weather Statement
National Weather Service Omaha/Valley Nebraska
458 PM CDT Sat Apr 23 2022

IAC137-232208-
/O.CAN.KOAX.TO.W.0013.000000T0000Z-220423T2215Z/
Montgomery IA-
458 PM CDT Sat Apr 23 2022

...THE TORNADO WARNING FOR EASTERN MONTGOMERY 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.

A Severe Thunderstorm Watch remains in effect until 1000 PM CDT for
southwestern Iowa.

LAT...LON 4095 9504 4098 9509 4105 9512 4116 9501
      4116 9493 4103 9493
TIME...MOT...LOC 2156Z 212DEG 48KT 4109 9499 

$$

CA

The office that day

Everything else NWS Omaha, NE issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 23, 2:23 AM CDT	Red Flag Warning	OAX	Monona	18 hr
Apr 23, 5:01 AM CDT	Severe Thunderstorm Warning	OAX	Fremont, Mills, Pottawattamie	29 min
Apr 23, 5:12 AM CDT	Severe Thunderstorm Warning	OAX	Harrison, Monona, Pottawattamie	33 min
Apr 23, 5:27 AM CDT	Severe Thunderstorm Warning	OAX	Harrison, Pottawattamie, Shelby	33 min
Apr 23, 5:33 AM CDT	Severe Thunderstorm Warning	OAX	Harrison, Monona	27 min
Apr 23, 5:58 AM CDT	Severe Thunderstorm Warning	OAX	Pottawattamie, Shelby	17 min
Apr 23, 10:19 AM CDT	High Wind Warning	OAX	Harrison, Mills, Monona, Montgomery, Pottawattamie, Shelby	9 hr
Apr 23, 4:42 PM CDT	Severe Thunderstorm Warning	OAX	Montgomery, Page	33 min

Nearby

Tornado Warnings in Iowa, 2022 Every tornado warning in 2022 Tornadoes in 2022

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.