A cold front was making its way across the state from the north and northwest and lit up in the afternoon around 4:30 pm to 5:00 pm just outside of the metro and progressed south and southeastward as isolated to multicell storms.  A tornado formed northwest of Creston, likely aided by interactions of the parent storm with the outflow from a nearby storm.  Otherwise, storms primarily dropped heavy rainfall and quarter sized hail, with a couple reports of golf ball sized hail.

Hail in UNION, IOWA
From 02-AUG-15 18:09:00 to 02-AUG-15 18:09:00 (CST-6)
Location: CRESTON
Magnitude: 1.00 
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Amateur radio report of quarter sized hail in Creston.

Hail in POWESHIEK, IOWA
From 02-AUG-15 19:01:00 to 02-AUG-15 19:01:00 (CST-6)
Location: TILTON
Magnitude: 2.00 
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Social Media

Twitter report relayed by KWWL of approximately 2 inch hail.  Delayed report and time estimated via radar.

Hail in TAYLOR, IOWA
From 02-AUG-15 19:13:00 to 02-AUG-15 19:13:00 (CST-6)
Location: GRAVITY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency Manager reported quarter sized hail NW of Bedford.  Report was relayed via amateur radio.

Hail in TAYLOR, IOWA
From 02-AUG-15 19:26:00 to 02-AUG-15 19:26:00 (CST-6)
Location: NEW MARKET
Magnitude: 1.75 
Property damage: 5.00K
Crop damage: 5.00K
Reported by: Trained Spotter

Trained spotter now reports hail has increased in size to golf balls since last report.

Funnel Cloud in TAYLOR, IOWA
From 02-AUG-15 19:35:00 to 02-AUG-15 19:35:00 (CST-6)
Location: NEW MARKET
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported a funnel cloud overhead moving southeast.

Hail in TAYLOR, IOWA
From 02-AUG-15 19:13:00 to 02-AUG-15 19:13:00 (CST-6)
Location: GRAVITY
Magnitude: 1.50 
Property damage: 10.00K
Crop damage: 5.00K
Reported by: Trained Spotter

Trained spotter reported ping pong ball size hail.

Tornado in ADAMS, IOWA
From 02-AUG-15 17:27:00 to 02-AUG-15 17:57:00 (CST-6)
Location: WILLIAMSON
Tornado F-scale: EF1
Property damage: 200.00K
Crop damage: 20.00K
Reported by: NWS Storm Survey

This segment is for Adams county.  This very visible tornado meandered across Adair and Adams counties for over half an hour, traveling only 8.5 miles in that time. The worst damage occurred near the small hamlet of Williamson where multiple buildings were damaged. The tornado initially traveled to the SW-SE, but executed a cyclonic loop two miles south of Williamson and then traveled to the N-NE for the remainder of its life.

Tornado in ADAIR, IOWA
From 02-AUG-15 17:21:00 to 02-AUG-15 17:27:00 (CST-6)
Location: FISK
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 15.00K
Reported by: NWS Storm Survey

This very visible tornado meandered across Adair and Adams counties for over half an hour, traveling only 8.5 miles in that time. The worst damage occurred near the small hamlet of Williamson where multiple buildings were damaged. The tornado initially traveled to the SW-SE, but executed a cyclonic loop two miles south of Williamson and then traveled to the N-NE for the remainder of its life.  This is segment is for Adair county, the tornado then continued into Adams county.

Hail in AUDUBON, IOWA
From 02-AUG-15 04:03:00 to 02-AUG-15 04:03:00 (CST-6)
Location: AUDUBON ARPT
Magnitude: 1.00 
Property damage: 5.00K
Crop damage: 0.00K
Reported by: COOP Observer

Thunderstorm Wind in DALLAS, IOWA
From 02-AUG-15 16:25:00 to 02-AUG-15 16:25:00 (CST-6)
Location: HADDEN HILL
Magnitude: 52.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported a semi truck blown over in Costco parking lot.  Time estimated via radar and picture submitted via twitter.

Hail in TAYLOR, IOWA
From 02-AUG-15 19:23:00 to 02-AUG-15 19:23:00 (CST-6)
Location: NEW MARKET
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported quarter sized hail.

Hail in ADAIR, IOWA
From 02-AUG-15 16:47:00 to 02-AUG-15 16:47:00 (CST-6)
Location: GREENFIELD
Magnitude: 1.00 
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported brief quarter size hail in Greenfield.

Hail in ADAIR, IOWA
From 02-AUG-15 16:50:00 to 02-AUG-15 16:50:00 (CST-6)
Location: GREENFIELD
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency Manager reported nickel size hail in Greenfield around 5:50pm CDT.

Hail in ADAIR, IOWA
From 02-AUG-15 17:10:00 to 02-AUG-15 17:10:00 (CST-6)
Location: ORIENT
Magnitude: 1.25 
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported half dollar size hail near Orient.

Hail in JASPER, IOWA
From 02-AUG-15 17:20:00 to 02-AUG-15 17:20:00 (CST-6)
Location: MONROE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported quarter sized hail in Monroe, IA.

Hail in JASPER, IOWA
From 02-AUG-15 17:20:00 to 02-AUG-15 17:20:00 (CST-6)
Location: REASNOR
Magnitude: 1.75 
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Volunteer fire department in Reasnor reported golf ball sized hail.

Funnel Cloud in UNION, IOWA
From 02-AUG-15 17:20:00 to 02-AUG-15 17:20:00 (CST-6)
Location: SPAULDING
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported a funnel cloud not yet on the ground about 8 miles NW of Creston.

Funnel Cloud in ADAMS, IOWA
From 02-AUG-15 17:27:00 to 02-AUG-15 17:27:00 (CST-6)
Location: CARL
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported a funnel cloud near Mulberry Ave in northeastern Adams County.

Hail in UNION, IOWA
From 02-AUG-15 17:52:00 to 02-AUG-15 17:52:00 (CST-6)
Location: CRESTON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter report quarter sized hail.

Thunderstorm Wind in LUCAS, IOWA
From 02-AUG-15 17:55:00 to 02-AUG-15 17:55:00 (CST-6)
Location: CHARITON
Magnitude: 52.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Public

Public reported multiple large tree branches down in town.

Thunderstorm Wind in LUCAS, IOWA
From 02-AUG-15 17:55:00 to 02-AUG-15 17:55:00 (CST-6)
Location: CHARITON
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

AWOS site in Chariton measured a wind gust of 50 kts.

Hail in LUCAS, IOWA
From 02-AUG-15 18:00:00 to 02-AUG-15 18:00:00 (CST-6)
Location: LUCAS
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported nickel sized hail.

Thunderstorm Wind in LUCAS, IOWA
From 02-AUG-15 18:00:00 to 02-AUG-15 18:00:00 (CST-6)
Location: LUCAS
Magnitude: 61.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported multiple trees down.

Hail in UNION, IOWA
From 02-AUG-15 18:01:00 to 02-AUG-15 18:01:00 (CST-6)
Location: CRESTON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Amateur radio report of quarter sized hail on the west side of Creston.