A frontal boundary settled across northern Kansas, northern Missouri and central Illinois. This front was the focus area for the development of several rounds of showers and thunderstorms that impacted the region. The first round came through during the morning, and produced mainly torrential rainfall, small hail, brief wind gusts and frequent lightning.
The second round of showers and thunderstorms developed and passed across the region during the late afternoon and evening hours. A segment of thunderstorms became severe along and south of Highway 34, and produced damaging wind gusts near 70 MPH. This led to several reports of wind damage from Burlington eastward to Roseville. Additionally, prolonged torrential rainfall over already saturated grounds lead to numerous reports of flash flooding across the area.

Flash Flood in WASHINGTON, IOWA
From 28-MAY-19 16:39:00 to 28-MAY-19 19:39:00 (CST-6)
Location: KALONA ARPT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Street flooding in Kalona, mainly on south side of town.

Flash Flood in JEFFERSON, IOWA
From 28-MAY-19 17:14:00 to 28-MAY-19 21:14:00 (CST-6)
Location: BATAVIA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Photos sent of creek out of its banks, running over roads in the area.

Flash Flood in VAN BUREN, IOWA
From 28-MAY-19 18:30:00 to 28-MAY-19 21:30:00 (CST-6)
Location: BONAPARTE ARPT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Water was quickly flowing over Highway 2 in Farmington.

Flash Flood in DES MOINES, IOWA
From 28-MAY-19 18:47:00 to 28-MAY-19 21:47:00 (CST-6)
Location: BEAVERDALE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Flint Creek water flowing over Flint Bottom Road and affecting the Flint Creek Bridge.

Flash Flood in JOHNSON, IOWA
From 28-MAY-19 18:54:00 to 28-MAY-19 22:54:00 (CST-6)
Location: OAKDALE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Deer Creek rose rapidly from no flooding to moderate flood stage due to heavy rain.

Flash Flood in IOWA, IOWA
From 28-MAY-19 19:02:00 to 28-MAY-19 22:02:00 (CST-6)
Location: NORTH ENGLISH
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The North English  River, west of Q Avenue  rose above flood stage rapidly due to the heavy rain.

Flash Flood in WASHINGTON, IOWA
From 28-MAY-19 19:03:00 to 28-MAY-19 21:03:00 (CST-6)
Location: WELLMAN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

An IFC river gage near 338th Avenue, on the South English River rapidly rose over flood stage due to heavy heavy rain.

Flash Flood in LOUISA, IOWA
From 28-MAY-19 22:30:00 to 29-MAY-19 01:30:00 (CST-6)
Location: COLUMBUS CITY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Highway 92 was damaged by flash flooding just west of Columbus Junction.  The highway was cracked and needed to be closed.

Hail in VAN BUREN, IOWA
From 28-MAY-19 15:30:00 to 28-MAY-19 15:30:00 (CST-6)
Location: MILTON
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in HENRY, IOWA
From 28-MAY-19 17:58:00 to 28-MAY-19 17:58:00 (CST-6)
Location: NEW LONDON
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in DES MOINES, IOWA
From 28-MAY-19 18:14:00 to 28-MAY-19 18:14:00 (CST-6)
Location: BEAVERDALE
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm Wind in HENRY, IOWA
From 28-MAY-19 17:54:00 to 28-MAY-19 17:54:00 (CST-6)
Location: NEW LONDON
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

The spotter reported 50 to 60 mph wind gusts.

Thunderstorm Wind in LEE, IOWA
From 28-MAY-19 18:08:00 to 28-MAY-19 18:08:00 (CST-6)
Location: FRANKLIN
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Pea sized hail and heavy rain also reported.

Thunderstorm Wind in DES MOINES, IOWA
From 28-MAY-19 18:14:00 to 28-MAY-19 18:14:00 (CST-6)
Location: BEAVERDALE
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Winds gusting to at least 65 mph and torrential rain.

Thunderstorm Wind in DES MOINES, IOWA
From 28-MAY-19 18:19:00 to 28-MAY-19 18:19:00 (CST-6)
Location: (BRL)BURLINGTON MUNI
Magnitude: 59.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS