Early morning convection across southern Iowa developed on the nose of the low-level jet in conjunction with a stationary front, remaining sub-severe. This boundary lifted north into central Iowa and by afternoon CAPE exceeded 2000 J/kg with 30+ knots of shear. Storms were able to restrengthen along this boundary in the afternoon, producing up to baseball-sized hail and gusty winds resulting in tree damage.

Hail in WARREN, IOWA
From 14-MAY-20 15:18:00 to 14-MAY-20 15:18:00 (CST-6)
Location: NEW VIRGINIA
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained Spotter report of golf ball sized hail.

Hail in WARREN, IOWA
From 14-MAY-20 15:19:00 to 14-MAY-20 15:19:00 (CST-6)
Location: NEW VIRGINIA
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter report of 1.25 inch hail.

Hail in WARREN, IOWA
From 14-MAY-20 15:22:00 to 14-MAY-20 15:22:00 (CST-6)
Location: NEW VIRGINIA
Magnitude: 2.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Media relayed image of baseball sized hail. Delayed report via social media. Time estimate via radar.

Hail in WARREN, IOWA
From 14-MAY-20 15:24:00 to 14-MAY-20 15:24:00 (CST-6)
Location: MEDORA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Amateur radio relayed report fo quarter sized hail.

Hail in WARREN, IOWA
From 14-MAY-20 15:30:00 to 14-MAY-20 15:30:00 (CST-6)
Location: NEW VIRGINIA
Magnitude: 3.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency management relayed report of 3 inch hail.

Hail in WARREN, IOWA
From 14-MAY-20 15:35:00 to 14-MAY-20 15:35:00 (CST-6)
Location: COOL
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported 1.25 inch hail.

Hail in WARREN, IOWA
From 14-MAY-20 15:46:00 to 14-MAY-20 15:46:00 (CST-6)
Location: INDIANOLA ARPT
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public report of penny sized hail.

Hail in WARREN, IOWA
From 14-MAY-20 16:00:00 to 14-MAY-20 16:00:00 (CST-6)
Location: MILO
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency management reported quarter sized hail.

Hail in WARREN, IOWA
From 14-MAY-20 16:13:00 to 14-MAY-20 16:13:00 (CST-6)
Location: COOL
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public report fo quarter sized hail.

Hail in WARREN, IOWA
From 14-MAY-20 16:22:00 to 14-MAY-20 16:22:00 (CST-6)
Location: COOL
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter report of nickel sized hail.

Hail in WAPELLO, IOWA
From 14-MAY-20 18:09:00 to 14-MAY-20 18:09:00 (CST-6)
Location: KIRKVILLE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency manager report of quarter sized hail.

Heavy Rain in WARREN, IOWA
From 14-MAY-20 15:45:00 to 14-MAY-20 16:30:00 (CST-6)
Location: NEW VIRGINIA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported 2.1 inches of rain fell in approximately 45 minutes.

Heavy Rain in WARREN, IOWA
From 14-MAY-20 15:00:00 to 14-MAY-20 21:00:00 (CST-6)
Location: NEW VIRGINIA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter report of 2.7 inches of rain.

Lightning in POLK, IOWA
From 14-MAY-20 15:30:00 to 14-MAY-20 15:30:00 (CST-6)
Location: GRIMES
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement report of lightning striking a home.

Thunderstorm Wind in MARION, IOWA
From 14-MAY-20 16:55:00 to 14-MAY-20 16:55:00 (CST-6)
Location: DURHAM
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Multiple large tree limbs down along Pierce Drive.

Heavy Rain in MAHASKA, IOWA
From 14-MAY-20 16:00:00 to 14-MAY-20 22:00:00 (CST-6)
Location: LAKONTA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

CoCoRaHS report of 2.56 inches of rain. Beginning and end time roughly estimated from radar.

Heavy Rain in WAPELLO, IOWA
From 14-MAY-20 16:00:00 to 14-MAY-20 22:00:00 (CST-6)
Location: (OTM)OTTUMWA INDSTRL
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

ASOS report of 4.37 inches of rain. Beginning and end time roughly estimated from radar.

Heavy Rain in MAHASKA, IOWA
From 14-MAY-20 16:00:00 to 14-MAY-20 22:00:00 (CST-6)
Location: OLIVET
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

CO-OP report of 2.08 inches of rain. Beginning and end time roughly estimated from radar.

Heavy Rain in MARION, IOWA
From 14-MAY-20 16:00:00 to 14-MAY-20 22:00:00 (CST-6)
Location: COLUMBIA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

CO-OP report of 2.30 inches of rain. Beginning and end time roughly estimated from radar.

Heavy Rain in MARION, IOWA
From 14-MAY-20 16:00:00 to 14-MAY-20 22:00:00 (CST-6)
Location: KNOXVILLE ARPT
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

CO-OP report of 5.19 inches of rain. Beginning and end time roughly estimated from radar.

Heavy Rain in LUCAS, IOWA
From 14-MAY-20 16:00:00 to 14-MAY-20 22:00:00 (CST-6)
Location: CHARITON
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

CO-OP report of 2 inches of rain. Beginning and end time roughly estimated from radar.

Heavy Rain in LUCAS, IOWA
From 14-MAY-20 16:30:00 to 14-MAY-20 22:00:00 (CST-6)
Location: RUSSELL
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

CoCoRaHs report of 2 inches of rain. Beginning and end time roughly estimated from radar.

Heavy Rain in DAVIS, IOWA
From 14-MAY-20 19:00:00 to 15-MAY-20 00:00:00 (CST-6)
Location: FLORIS
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

CoCoRaHS report of 2.15 inches of rain. Beginning and end time roughly estimated from radar.

Heavy Rain in LUCAS, IOWA
From 14-MAY-20 17:00:00 to 14-MAY-20 19:00:00 (CST-6)
Location: LUCAS
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reports heavy rain with fields and ditches filled with water. Beginning and end time roughly estimated from radar.