A slow moving, nearly stationary boundary was oriented across Iowa from southwest to northeast during the 13th. Storms initiated along and near the boundary during the overnight hours from the 12th to the 13th and onward through the day. The environment on the warm side of the front was CAPE filled with SBCAPE values in excess of 3000-4000 J/kg. Additionally, much like the convective season to this point, other supporting severe weather parameters were lacking such as effective shear (under 30 kts), DCAPE (under 1000 J/kg), and hail CAPE (under 500 J/kg) to name a few. The result was typically short lived strong storms, but a few were able to at least briefly organized near the front or along outflow boundaries and produce sporadic strong and damaging winds.

Lightning in STORY, IOWA
From 13-JUL-18 14:55:00 to 13-JUL-18 14:55:00 (CST-6)
Location: COLO
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Two men were taken to the hospital after being struck by lightning at a golf course. Both men were injured and then released the following day from the hospital. One suffered nerve damage and the loss of hearing on one of his ears.

Funnel Cloud in MARION, IOWA
From 13-JUL-18 15:30:00 to 13-JUL-18 15:30:00 (CST-6)
Location: PELLA MUNI ARPT
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Report via social media.

Thunderstorm Wind in SAC, IOWA
From 13-JUL-18 11:25:00 to 13-JUL-18 11:25:00 (CST-6)
Location: LYTTON
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency manager reported wind gusts of up to 60 mph east of Sac City.

Funnel Cloud in HARDIN, IOWA
From 13-JUL-18 14:20:00 to 13-JUL-18 14:20:00 (CST-6)
Location: ACKLEY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hardin County Sheriff relayed public reports of a funnel cloud near Ackley.

Thunderstorm Wind in MARION, IOWA
From 13-JUL-18 15:56:00 to 13-JUL-18 15:56:00 (CST-6)
Location: PELLA MUNI ARPT
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Pella Municipal Airport recorded a 58 mph wind gust.

Thunderstorm Wind in MAHASKA, IOWA
From 13-JUL-18 16:16:00 to 13-JUL-18 16:16:00 (CST-6)
Location: NEW SHARON
Magnitude: 56.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported a large tree down blocking the road near the high school in New Sharon.

Thunderstorm Wind in MARION, IOWA
From 13-JUL-18 15:45:00 to 13-JUL-18 15:45:00 (CST-6)
Location: PELLA
Magnitude: 52.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Social Media

Public relayed pictures of several large tree limbs down.  This is a delayed report.

Thunderstorm Wind in MAHASKA, IOWA
From 13-JUL-18 16:20:00 to 13-JUL-18 16:20:00 (CST-6)
Location: NEW SHARON
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported tree limbs broken.

Thunderstorm Wind in MAHASKA, IOWA
From 13-JUL-18 16:21:00 to 13-JUL-18 16:21:00 (CST-6)
Location: OSKALOOSA
Magnitude: 52.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported tree limbs down, of unknown size, on power lines in Oskaloosa.

Thunderstorm Wind in WAPELLO, IOWA
From 13-JUL-18 16:08:00 to 13-JUL-18 16:08:00 (CST-6)
Location: EDDYVILLE
Magnitude: 56.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported a large tree down covering about 3/4 of the road near Highway 63 in Eddyville. Time estimated by radar.