A weak boundary extended across northern Iowa into the west central counties.  Thunderstorms developed first over north central Iowa, then develped rapidly into central and parts of southwest and west central Iowa.  The available shear was in the 40 to 50 kt range.  There was 1000 to 1500 J/kg of elevated CAPE available.  Downraft CAPE was in the 800 to 1200 J/kg.  CAPE in the -10 to -30 C layer of the atmosphere was 200 to 400 J/kg at the onset.  A low level jet of 30 to 40 kts transported moisture into the area with 0.8 to 1 inch of precipitable water available.  Surface dewpoints climbed into the upper 50s to low 60s across central and southern Iowa.  Hail was the initial severe threat with the the freezing level only 11,500 to 11,800 feet.  Storms initially fired in north central Iowa.  Hail of one to 1.5 inch in diameter was common.

Hail in HAMILTON, IOWA
From 29-APR-13 23:16:00 to 29-APR-13 23:16:00 (CST-6)
Location: ELLSWORTH
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in HUMBOLDT, IOWA
From 29-APR-13 20:20:00 to 29-APR-13 20:20:00 (CST-6)
Location: RENWICK
Magnitude: 1.50 
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in WRIGHT, IOWA
From 29-APR-13 22:40:00 to 29-APR-13 22:50:00 (CST-6)
Location: WOOLSTOCK
Magnitude: 1.25 
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Social Media

Hail lasted 10 minutes.  Received via Twitter.

Hail in HANCOCK, IOWA
From 29-APR-13 21:05:00 to 29-APR-13 21:05:00 (CST-6)
Location: KANAWHA
Magnitude: 1.25 
Property damage: 3.00K
Crop damage: 0.00K
Reported by: COOP Observer

Hail in BOONE, IOWA
From 29-APR-13 21:33:00 to 29-APR-13 21:33:00 (CST-6)
Location: OGDEN
Magnitude: 1.00 
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in BOONE, IOWA
From 29-APR-13 21:33:00 to 29-APR-13 21:33:00 (CST-6)
Location: OGDEN
Magnitude: 1.00 
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in BOONE, IOWA
From 29-APR-13 21:50:00 to 29-APR-13 21:50:00 (CST-6)
Location: BEAVER
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in BOONE, IOWA
From 29-APR-13 21:45:00 to 29-APR-13 21:45:00 (CST-6)
Location: BOONE
Magnitude: 1.00 
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in GREENE, IOWA
From 29-APR-13 22:03:00 to 29-APR-13 22:03:00 (CST-6)
Location: PATON
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in HANCOCK, IOWA
From 29-APR-13 21:00:00 to 29-APR-13 21:00:00 (CST-6)
Location: KANAWHA
Magnitude: 1.25 
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Report forwarded from KIMT television.

Hail in BOONE, IOWA
From 29-APR-13 22:21:00 to 29-APR-13 22:21:00 (CST-6)
Location: BOONE
Magnitude: 1.50 
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Quarter to ping pong ball size hail.

Hail in GREENE, IOWA
From 29-APR-13 22:18:00 to 29-APR-13 22:18:00 (CST-6)
Location: CHURDAN
Magnitude: 1.75 
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail fell along Highway 4.

Hail in GREENE, IOWA
From 29-APR-13 22:25:00 to 29-APR-13 22:25:00 (CST-6)
Location: PATON
Magnitude: 1.50 
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in HANCOCK, IOWA
From 29-APR-13 21:02:00 to 29-APR-13 21:02:00 (CST-6)
Location: KANAWHA
Magnitude: 1.00 
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Nickel to quarter size hail.