A weak cold front moved southeast across Iowa early on the 4th and had become stationary east-west to the south of the state.  The thermal gradient increased during the day and moisture pooled along the front by evening.  The atmosphere became quite unstable by late afternoon with temperatures reaching well into the 90s south of the front, and dew point readings rising into the low 70s along the front.  CAPE was in the 3000 to 4000 J/kg range by mid to late evening with lifted indices in the -5 to -10 C range.  Precipitable water values increased to near 2 inches along the front as the 850 mb jet increased to 30 to 40 kts.  Downdraft CAPE was in the 700 to 1000 J/kg range and available CAPE in the -10 to -30 C layer of the atmosphere was 400 to 600 J/kg.  The freezing level was relatively high, in the 13,000 to 13,500 foot range, however with effective shear in the  50 to 70 kt range, plenty of dynamic energy was available.  Thunderstorms developed initially over southeast Iowa into Missouri and produced large hail.  Quarter to golf ball size hail fell in Davis and Appanoose Counties.  As the night progressed, the first round of thunderstorms moved southeast of Iowa.  By midnight, the second round of storms developed over southern Iowa.  Though there was no severe weather with this round, heavy rainfall occurred.  A third round moved through during the predawn hours, producing very heavy rainfall of 2 to 3 inches per hour.  Total rainfall of 3 to 6 inches was common over south central into part of southwest Iowa.  This resulted in flash flooding with numerous highways closed by high water.  Evacuations took place in the south of Lamoni as waters rose.  Water rose quickly in the middle fork of the Grand River, scouring out the highway on the U.S. 169 bridge south of the 10 mile post marker.  Following the flash flooding, areal flooding took places over parts of south central into southwest Iowa for about 24 hours.

Flash Flood in ADAMS, IOWA
From 05-JUN-10 03:30:00 to 05-JUN-10 07:30:00 (CST-6)
Location: NEVINVILLE
Flood cause: Heavy Rain
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Water over Willow Road near the intersection of 150th St.

Flash Flood in ADAMS, IOWA
From 05-JUN-10 03:15:00 to 05-JUN-10 07:30:00 (CST-6)
Location: NEVINVILLE
Flood cause: Heavy Rain
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Water over the roads near 150th and Union.

Flash Flood in RINGGOLD, IOWA
From 05-JUN-10 00:50:00 to 05-JUN-10 07:30:00 (CST-6)
Location: REDDING
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Water covering Highway P27 with ditches full of water.

Hail in DAVIS, IOWA
From 04-JUN-10 20:35:00 to 04-JUN-10 20:35:00 (CST-6)
Location: MARK
Magnitude: 1.75 
Property damage: 10.00K
Crop damage: 15.00K
Reported by: Trained Spotter

Estimated winds of 50 MPH occurred as well.

Hail in DAVIS, IOWA
From 04-JUN-10 20:50:00 to 04-JUN-10 20:50:00 (CST-6)
Location: PULASKI
Magnitude: 1.00 
Property damage: 5.00K
Crop damage: 10.00K
Reported by: Trained Spotter

Strong winds along with heavy rain also reported.

Flash Flood in RINGGOLD, IOWA
From 05-JUN-10 06:00:00 to 05-JUN-10 07:30:00 (CST-6)
Location: DELPHOS
Flood cause: Heavy Rain
Property damage: 250.00K
Crop damage: 0.00K
Reported by: Department of Highways

Highway 169 bridge closed just south of the 10 mile post due to scouring of water from the middle fork of the Grand River.

Flash Flood in UNION, IOWA
From 05-JUN-10 05:45:00 to 05-JUN-10 07:30:00 (CST-6)
Location: CRESTON ARPT
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Water over Pole Road just north of the intersection of 250th St.

Hail in APPANOOSE, IOWA
From 04-JUN-10 20:22:00 to 04-JUN-10 20:22:00 (CST-6)
Location: SEDAN
Magnitude: 1.00 
Property damage: 3.00K
Crop damage: 10.00K
Reported by: Trained Spotter

Heavy rain and strong winds occurred with the hail.

Hail in APPANOOSE, IOWA
From 04-JUN-10 20:24:00 to 04-JUN-10 20:24:00 (CST-6)
Location: MOULTON
Magnitude: 1.75 
Property damage: 10.00K
Crop damage: 10.00K
Reported by: Trained Spotter

Flash Flood in ADAMS, IOWA
From 05-JUN-10 07:20:00 to 05-JUN-10 08:20:00 (CST-6)
Location: STRINGTOWN
Flood cause: Heavy Rain
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Water on road approximately 3 miles of west of Highway 25 on Highway 34.

Flash Flood in UNION, IOWA
From 05-JUN-10 02:50:00 to 05-JUN-10 07:30:00 (CST-6)
Location: CRESTON
Flood cause: Heavy Rain
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Manhole cover was lifted due to rushing water at the intersection of Highway 34 and Elm St.  Some underpasses submerged on Osage St.

Flood in DECATUR, IOWA
From 05-JUN-10 10:00:00 to 06-JUN-10 05:30:00 (CST-6)
Location: LAMONI
Flood cause: Heavy Rain
Property damage: 250.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Flash Flood in DECATUR, IOWA
From 05-JUN-10 00:11:00 to 05-JUN-10 07:30:00 (CST-6)
Location: LAMONI
Flood cause: Heavy Rain
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Eight inches of standing water in town.  Highway 69 closed due to water on the road and stranded vehicles.

Flood in RINGGOLD, IOWA
From 05-JUN-10 09:40:00 to 06-JUN-10 05:30:00 (CST-6)
Location: MT AYR MUNI ARPT
Flood cause: Heavy Rain
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Highway 169 underwater.

Flood in ADAMS, IOWA
From 05-JUN-10 10:00:00 to 06-JUN-10 05:30:00 (CST-6)
Location: CORNING
Flood cause: Heavy Rain
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Flood in TAYLOR, IOWA
From 05-JUN-10 12:45:00 to 06-JUN-10 05:30:00 (CST-6)
Location: BEDFORD ARPT
Flood cause: Heavy Rain
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Water over numerous roads.

Flood in UNION, IOWA
From 05-JUN-10 10:00:00 to 06-JUN-10 05:30:00 (CST-6)
Location: CRESTON
Flood cause: Heavy Rain
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Heavy Rain in DECATUR, IOWA
From 04-JUN-10 22:53:00 to 05-JUN-10 01:53:00 (CST-6)
Location: (30I)LAMONI MUNI ARP
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Rainfall of 3.19 inches.