Initial storms developed within the warm sector of a surface low that tracked northwest of the area, followed by a strong cold front with associated dry line that produced a quasi-linear (QLCS) storm mode later in the evening. Several tornadoes occurred across western into northern Iowa.  Initially the tornadoes were associated with supercell storms, however later storms produced QLCS tornadoes as it raced east northeast across the state. In addition to the tornadoes, hail up to tennis ball size occurred with initial super cells. The later QLCS produced hail up to golf ball sized along with damaging wind gusts over 70 mph at times.
Additionally, total rainfall in excess of 2 to 4 inches fell in a swath across areas that dealt with the severe thunderstorm and tornado warnings earlier in the event. While no flash flooding was experienced, rainfall in the Winnebago River basin above Mason City resulted in minor river flooding on April 13th, exceeding minor flood stage in the morning and receding below flood stage that evening.

Tornado in WORTH, IOWA
From 12-APR-22 21:34:00 to 12-APR-22 21:36:00 (CST-6)
Location: GRAFTON
Tornado F-scale: EF1
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Tornado developed south of Highway 9 and west of Warbler Avenue and moved northeast.  The tornado encountered a farmstead on the south side of Highway 9 producing EF1 damage to trees and an outbuilding.  The tornado continued northeast and remained in rural farmland the rest of its path.

Hail in POCAHONTAS, IOWA
From 12-APR-22 16:30:00 to 12-APR-22 16:30:00 (CST-6)
Location: FONDA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Report of quarter sized hail via social media.

Tornado in HANCOCK, IOWA
From 12-APR-22 18:33:00 to 12-APR-22 18:36:00 (CST-6)
Location: KANAWHA
Tornado F-scale: EF0
Property damage: 20.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

The tornado developed just west of Iowa Avenue south of 120th Street west of Kanawha and immediately produced minor damage to outbuildings.  The tornado continued east northeast and grazed the northwest edge of Kanawha with tree branches downed along with minor damage to a few houses, mainly from missing shingles.  The tornado dissipated not far northeast of the town.

Tornado in CERRO GORDO, IOWA
From 12-APR-22 21:26:00 to 12-APR-22 21:32:00 (CST-6)
Location: CLEAR LAKE JCT
Tornado F-scale: EF1
Property damage: 125.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

This QLCS tornado developed to the southwest of the intersection of 43rd Street SW and South Federal Avenue.  The tornado crossed Federal Avenue and produced EF1 damage to several commercial buildings on the east side of the road.   The tornado continued northeast and damaged another commercial building along 245th Street near the Union Pacific railroad.  Additional damage occurred to trees along S Kentucky Avenue and eventually near 4th Street SE near Yorktown Pike.   The tornado lifted before encountering Buena Vista University - Mason City Campus.

Tornado in HUMBOLDT, IOWA
From 12-APR-22 17:28:00 to 12-APR-22 17:37:00 (CST-6)
Location: UNIQUE
Tornado F-scale: EF1
Property damage: 100.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

This tornado had an unusual path with a fishhook shaped track.  The tornado started to the northwest just south of 230th Street between Elm and Florida Avenues.  The tornado produced EF1 damage at a farmstead on the south side of 230th street, mostly to trees. The tornado began to loop northward along Elm Avenue producing damage at a couple of farms.  The tornado continued to curve toward the northeast and eventually an east northeast heading ending a little over a mile southwest of Rutland, IA.

Tornado in HUMBOLDT, IOWA
From 12-APR-22 17:39:00 to 12-APR-22 17:50:00 (CST-6)
Location: RUTLAND
Tornado F-scale: EF2
Property damage: 75.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

This tornado also had a fishhook shape with the initial touchdown captured on video providing evidence of its northwest heading.  This occurred just north of 180th Street west of Georgia Avenue.  The tornado had more of a north heading upon crossing 170th Street and impacted a couple of farmstead, producing EF1 damage.   The tornado continued to curve counter-clockwise eventually reaching a northeast heading. Upon crossing Iowa Avenue just north of 145th Street, numerous sizeable power poles were snapped with EF2 damage occurring.  The tornado diminished about one and a quarter mile southeast of Bode, IA.

Tornado in POCAHONTAS, IOWA
From 12-APR-22 17:15:00 to 12-APR-22 17:33:00 (CST-6)
Location: PALMER
Tornado F-scale: EF2
Property damage: 150.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Tornado developed a few miles east northeast of Palmer and moved northeast to north for the entire path.  The tornado destroyed a farm buildings and also snapped several power poles producing the EF2 rating.   Otherwise, much of the path was in rural cropland with a large dust cloud enveloping the tornado for much of its life.

Hail in KOSSUTH, IOWA
From 12-APR-22 18:30:00 to 12-APR-22 18:30:00 (CST-6)
Location: ALGONA
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported golf ball sized hail.

Hail in HANCOCK, IOWA
From 12-APR-22 18:37:00 to 12-APR-22 18:37:00 (CST-6)
Location: KANAWHA
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported golf ball sized hail. Time estimated via radar.

Hail in POCAHONTAS, IOWA
From 12-APR-22 16:29:00 to 12-APR-22 16:29:00 (CST-6)
Location: FONDA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public report of dime and quarter sized hail.

Hail in SAC, IOWA
From 12-APR-22 16:17:00 to 12-APR-22 16:17:00 (CST-6)
Location: LYTTON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Mostly penny to nickel sized hail with some quarter sized hail mixed in.

Thunderstorm Wind in KOSSUTH, IOWA
From 12-APR-22 18:28:00 to 12-APR-22 18:28:00 (CST-6)
Location: HANNA
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Personal weather station recorded a 60 mph gust.

Hail in CERRO GORDO, IOWA
From 12-APR-22 19:11:00 to 12-APR-22 19:11:00 (CST-6)
Location: VENTURA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public report of quarter sized hail.

Hail in HANCOCK, IOWA
From 12-APR-22 19:36:00 to 12-APR-22 19:36:00 (CST-6)
Location: KANAWHA
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public report of golf ball sized hail.

Hail in PALO ALTO, IOWA
From 12-APR-22 18:38:00 to 12-APR-22 18:38:00 (CST-6)
Location: FAIRVILLE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported quarter sized hail.

Thunderstorm Wind in CARROLL, IOWA
From 12-APR-22 20:28:00 to 12-APR-22 20:28:00 (CST-6)
Location: CARROLL
Magnitude: 61.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Carroll AWOS gusted to 70 mph.

Hail in POCAHONTAS, IOWA
From 12-APR-22 17:41:00 to 12-APR-22 17:41:00 (CST-6)
Location: ROLFE
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported half dollar sized hail.

Hail in POCAHONTAS, IOWA
From 12-APR-22 17:29:00 to 12-APR-22 17:29:00 (CST-6)
Location: ROLFE
Magnitude: 2.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Broadcast media reported 2.5 inch hail northwest of Gilmore City.

Thunderstorm Wind in HAMILTON, IOWA
From 12-APR-22 21:20:00 to 12-APR-22 21:20:00 (CST-6)
Location: WEBSTER CITY ARPT
Magnitude: 58.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Peak gust reported at Webster City Municipal Airport.

Hail in HANCOCK, IOWA
From 12-APR-22 19:36:00 to 12-APR-22 19:36:00 (CST-6)
Location: KANAWHA
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported golf ball sized hail.

Hail in KOSSUTH, IOWA
From 12-APR-22 19:40:00 to 12-APR-22 19:40:00 (CST-6)
Location: GERLED
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported ping pong ball sized hail.

Thunderstorm Wind in HANCOCK, IOWA
From 12-APR-22 18:51:00 to 12-APR-22 18:51:00 (CST-6)
Location: KANAWHA
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reports trees down in Kanawha. Time estimated via radar.

Thunderstorm Wind in WRIGHT, IOWA
From 12-APR-22 21:23:00 to 12-APR-22 21:23:00 (CST-6)
Location: CLARION
Magnitude: 53.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Peak gust at Clarion.

Thunderstorm Wind in CERRO GORDO, IOWA
From 12-APR-22 21:24:00 to 12-APR-22 21:24:00 (CST-6)
Location: BURCHINAL
Magnitude: 54.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Personal weather station gusted to 62 mph.

Hail in POCAHONTAS, IOWA
From 12-APR-22 17:29:00 to 12-APR-22 17:29:00 (CST-6)
Location: ROLFE
Magnitude: 2.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public report of 2.5 inch hail northwest of Gilmore City.

Hail in HANCOCK, IOWA
From 12-APR-22 19:00:00 to 12-APR-22 19:00:00 (CST-6)
Location: GARNER
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported golf ball sized hail.

Hail in EMMET, IOWA
From 12-APR-22 16:56:00 to 12-APR-22 16:56:00 (CST-6)
Location: WELLINGFORD
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public report of ping pong ball sized hail. Delayed report. Time estimated via radar.

Hail in CERRO GORDO, IOWA
From 12-APR-22 19:50:00 to 12-APR-22 19:50:00 (CST-6)
Location: MASON CITY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported quarter sized hail.

Thunderstorm Wind in CERRO GORDO, IOWA
From 12-APR-22 19:54:00 to 12-APR-22 19:54:00 (CST-6)
Location: PORTLAND
Magnitude: 54.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Small outbuilding and large tree knocked over from the inflow into the storm at this location.

Thunderstorm Wind in WRIGHT, IOWA
From 12-APR-22 21:14:00 to 12-APR-22 21:14:00 (CST-6)
Location: WOOLSTOCK
Magnitude: 65.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Personal weather station sustained at 54 mph and gusted to 75 mph.

Flood in CERRO GORDO, IOWA
From 13-APR-22 05:15:00 to 13-APR-22 18:45:00 (CST-6)
Location: FREEMAN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

River entered flood state at 515am LST on the 13th of April, crested at 10.91 ft at 745am LST on April 13th, and fell below flood stage at 645pm LST on April 13th.

Hail in KOSSUTH, IOWA
From 12-APR-22 18:52:00 to 12-APR-22 18:52:00 (CST-6)
Location: BANCROFT
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Spotter reported hail half dollar to 2 inches.

Hail in HANCOCK, IOWA
From 12-APR-22 18:50:00 to 12-APR-22 18:50:00 (CST-6)
Location: BRITT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public report of quarter sized hail.

Hail in HUMBOLDT, IOWA
From 12-APR-22 17:50:00 to 12-APR-22 17:50:00 (CST-6)
Location: BODE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Penny to quarter sized hail.

Hail in HUMBOLDT, IOWA
From 12-APR-22 17:52:00 to 12-APR-22 17:52:00 (CST-6)
Location: BODE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Public report of dimes sized hail increasing to quarter sized.

Thunderstorm Wind in KOSSUTH, IOWA
From 12-APR-22 18:15:00 to 12-APR-22 18:15:00 (CST-6)
Location: ALGONA MUNI ARPT
Magnitude: 63.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Gust measured by algona AWOS.

Hail in WORTH, IOWA
From 12-APR-22 20:11:00 to 12-APR-22 20:11:00 (CST-6)
Location: GRAFTON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported quarter sized hail.

Hail in POCAHONTAS, IOWA
From 12-APR-22 16:48:00 to 12-APR-22 16:48:00 (CST-6)
Location: FONDA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Quarter sized hail report via mping.

Hail in POCAHONTAS, IOWA
From 12-APR-22 16:52:00 to 12-APR-22 16:52:00 (CST-6)
Location: POCAHONTAS
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported penny and quarter sized hail.

Hail in KOSSUTH, IOWA
From 12-APR-22 18:27:00 to 12-APR-22 18:27:00 (CST-6)
Location: ALGONA
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Mostly penny sized hail with sporadic half dollar sized hail.

Hail in CERRO GORDO, IOWA
From 12-APR-22 20:23:00 to 12-APR-22 20:23:00 (CST-6)
Location: BURCHINAL
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Mping report of quarter sized hail.