For a third consecutive day, a boundary found itself draped from NE to SW roughly cutting the state of Iowa in half.  Similar afternoon conditions resulted as well with 1000 - 2000 J/kg MUCAPE, little CIN, and borderline to good effective bulk shear around 30 to 40 kts and pushing 50 kts at times.  With storms more closely rooted to the boundary, low level helicity in excess of 150 m2/s2 raised at least some concern for tornadoes. After a few initial discrete cells, storms eventually congealed into a progressive QLCS that moved across central Iowa and produced 3 weak tornadoes just east of the Des Moines metro area along with a few reports of wind damage and sub-severe hail.

Tornado in MARION, IOWA
From 03-MAY-18 18:48:00 to 03-MAY-18 18:50:00 (CST-6)
Location: PERCY
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Tree damage associated with a short lived tornado just adjacent to Des Moines River.  Tornado was reported by public.

Funnel Cloud in ADAMS, IOWA
From 03-MAY-18 15:47:00 to 03-MAY-18 15:47:00 (CST-6)
Location: DICKIEVILLE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Montgomery County Sheriff reported a funnel cloud.

Funnel Cloud in DALLAS, IOWA
From 03-MAY-18 16:42:00 to 03-MAY-18 16:42:00 (CST-6)
Location: HADDEN HILL
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported funnel cloud near the Dallas-Center Grimes High School.

Funnel Cloud in ADAIR, IOWA
From 03-MAY-18 16:48:00 to 03-MAY-18 16:48:00 (CST-6)
Location: HOWE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported funnel cloud nearly to the ground.

Thunderstorm Wind in WEBSTER, IOWA
From 03-MAY-18 17:10:00 to 03-MAY-18 17:10:00 (CST-6)
Location: (FOD)FT DODGE MUNI A
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported two large trees down in Fort Dodge.

Funnel Cloud in WARREN, IOWA
From 03-MAY-18 18:34:00 to 03-MAY-18 18:34:00 (CST-6)
Location: SANDYVILLE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported funnel cloud just west of Pleasantville.  Relayed by Fire Department and Law Enforcement.

Thunderstorm Wind in STORY, IOWA
From 03-MAY-18 18:55:00 to 03-MAY-18 18:55:00 (CST-6)
Location: COLLINS
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported at least 60 mph wind gusts and heavy rainfall.  Ditches were also full of water.

Thunderstorm Wind in POLK, IOWA
From 03-MAY-18 16:48:00 to 03-MAY-18 16:48:00 (CST-6)
Location: CLIVE
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter had a video of strong winds. Lawn furniture lofted and blown away.

Funnel Cloud in DALLAS, IOWA
From 03-MAY-18 16:37:00 to 03-MAY-18 16:37:00 (CST-6)
Location: VAN METER
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported a funnel cloud in the area.

Funnel Cloud in GUTHRIE, IOWA
From 03-MAY-18 16:50:00 to 03-MAY-18 16:50:00 (CST-6)
Location: STUART
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported a funnel cloud near Stuart.

Thunderstorm Wind in ADAMS, IOWA
From 03-MAY-18 16:30:00 to 03-MAY-18 16:30:00 (CST-6)
Location: DICKIEVILLE
Magnitude: 52.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Public

Public reported an apparent microburst that caused damage to a house and tree damage.

Hail in DALLAS, IOWA
From 03-MAY-18 16:37:00 to 03-MAY-18 16:37:00 (CST-6)
Location: HADDEN HILL
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported rotation in the clouds along with dime to penny sized hail.

Hail in WARREN, IOWA
From 03-MAY-18 16:42:00 to 03-MAY-18 16:42:00 (CST-6)
Location: NORWALK
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency manager reported nickel sized hail near Highway 5 and County Road R63.  Report relayed from Warren County Deputy..

Tornado in JASPER, IOWA
From 03-MAY-18 18:46:00 to 03-MAY-18 18:47:00 (CST-6)
Location: PRAIRIE CITY
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Tornado had short path through an agricultural field and nearby wooded area producing damage to trees.

Tornado in JASPER, IOWA
From 03-MAY-18 18:56:00 to 03-MAY-18 18:57:00 (CST-6)
Location: KROHN FLD ARPT
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Tree damage observed from a short lived tornado, otherwise it remained in agricultural fields.

Thunderstorm Wind in POLK, IOWA
From 03-MAY-18 16:50:00 to 03-MAY-18 16:50:00 (CST-6)
Location: RIDER
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported at least 60 mph winds along with copious amounts of small hail.

Funnel Cloud in ADAMS, IOWA
From 03-MAY-18 16:33:00 to 03-MAY-18 16:33:00 (CST-6)
Location: CARBON
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported a funnel nearly to the ground, and now back up.  Still saw a lower of the cloud at the time of the report.

Funnel Cloud in GUTHRIE, IOWA
From 03-MAY-18 16:30:00 to 03-MAY-18 16:30:00 (CST-6)
Location: CASEY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter just north of Menlo noted a funnel cloud to the WNW.  Location was approximate at the time.