Mini-supercells developed in a narrow corridor of weak surface based instability and   effective helicities around 50-100 m2/s2.  These parameters would typically be considered quite weak for Iowa but given it was the end of November, these values were decent and assisted by good dynamics.  Five tornadoes occurred during the afternoon, many with intermittent tracks but with plenty of spotter reports and visual evidence to substatiate their occurrence.

Hail in MONROE, IOWA
From 28-NOV-16 15:44:00 to 28-NOV-16 15:44:00 (CST-6)
Location: AVERY
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported penny sized hail with rotation being reported within the storm northeast of Blakesburg.

Funnel Cloud in GRUNDY, IOWA
From 28-NOV-16 15:31:00 to 28-NOV-16 15:31:00 (CST-6)
Location: FERN
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported a funnel cloud 3 miles west of Stout.

Tornado in POWESHIEK, IOWA
From 28-NOV-16 16:30:00 to 28-NOV-16 16:33:00 (CST-6)
Location: MONTEZUMA SIG ARPT
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement observed this brief tornado.  The intermittent path remained in open fields just to the southeast of Montezuma.

Tornado in HARDIN, IOWA
From 28-NOV-16 12:44:00 to 28-NOV-16 12:55:00 (CST-6)
Location: RADCLIFFE
Tornado F-scale: EF0
Property damage: 5.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Weak tornado developed on the north side of Radcliffe doing minor damage and tipping an old truck on its side.  The tornado continued on an intermittent track across rural areas northeast of Radcliffe for several miles with little additional damage.

Tornado in GRUNDY, IOWA
From 28-NOV-16 15:38:00 to 28-NOV-16 15:43:00 (CST-6)
Location: FERN
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A tornado developed in far northern Grundy County in rural areas southwest of Parkersburg.  The tornado was documented by video as it traveled northeast.  The funnel was diffuse and intermittent for much of it's track.  The tornado crossed into Butler County.

Tornado in BUTLER, IOWA
From 28-NOV-16 15:43:00 to 28-NOV-16 15:50:00 (CST-6)
Location: PARKERSBURG
Tornado F-scale: EF0
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Tornado continued from Grundy County.  The weak circulation moved northeast into Butler County and affected a small neighborhood on the east side of Parkersburg.  Only weak damage occurred in the form of shingle damage to houses in the vicinity.  Video of the tornado shows a diffuse circulation.

Tornado in MAHASKA, IOWA
From 28-NOV-16 16:11:00 to 28-NOV-16 16:15:00 (CST-6)
Location: NEW SHARON
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public pictures taken of tornado along with a tornadic debris signiture on radar confirm this tornado.  Tornado remained in rural areas of far northern Mahaska County with little damage before crossing into Poweshiek County.

Tornado in POWESHIEK, IOWA
From 28-NOV-16 16:15:00 to 28-NOV-16 16:21:00 (CST-6)
Location: FOREST HOME
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Tornado moved into Poweshiek County from Mahaska County.  Law enforcement observed this tornado from a distance.  This tornado also produced a tornadic debris signature on radar.  Little damage occurred along it's intermittent path.

Tornado in GRUNDY, IOWA
From 28-NOV-16 15:41:00 to 28-NOV-16 15:44:00 (CST-6)
Location: GRUNDY CENTER ARPT
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Weak tornado occurred west of Grundy Center and remained in farm fields with little if any damage.

Funnel Cloud in POWESHIEK, IOWA
From 28-NOV-16 16:25:00 to 28-NOV-16 16:25:00 (CST-6)
Location: MONTEZUMA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Cedar Falls Dispatch relayed a report from an officer of a funnel cloud SW of his position.  At the time of the report, the officer was just south of I-80 on Highway 21 looking to the SW.  Location estimated based on radar.