Another round of severe weather and heavy rain took place during the late afternoon and evening hours of the 9th, lasting into the early morning of the 10th.  A strong shortwave lifted northeast across the area.  This resulted in considerable overrunning of the stalled cold front to the south of Iowa.  CAPE was in the 2000+ J/kg range with lifted indices around -11 to the south of the front.  CAPE in the -10 to -30 C layer of the atmosphere remained in the 500 to 1000 J/kg range, though freezing levels approached 14,000 feet.  Downdraft CAPE was significant, around 1000 J/kg, however a relatively deep layer of cool air was in place over Iowa which limited the high wind potential.  The shear in the atmosphere was fairly strong, around 50 kts.  Thunderstorms fired up over southern Iowa to the north of the warm front, while another large area formed over western Iowa and moved east.  The primary mode of severe weather was in the form of hail from nickel size to golf ball size.  High winds occurred with a few of the storms, downing trees and power lines in a few places.  The other significant weather event was the very heavy rainfall.  Daily rainfall totals of 3 to nearly 5.5 inches were common over parts of central into south central Iowa.  The Des Moines airport recorded 4.53 inches of rain by midnight to set a daily rainfall record.  Another third of an inch fell after that by 300 AM.  In Warren County at St. Marys, 5.4 inches was recorded, with 5.21 inches in Marion County at Swan.  Polk City in Polk County received 5.01 inches, with 4.61 in Windsor Heights by midnight.  Northeast of Patterson in Warren County reported a 24 hour rainfall total of 6.7 inches, with a total for the storm approaching 10 inches.  There were numerous other reports of 4 to 6 inches of rain in Warren and Marion Counties.  The heaviest two day rainfall total was 9.31 inches, with 6.78 falling between the morning of the 9th and morning of the 10th.  Flash flooding occurred in Polk, Marion, and Warren Counties.  Local rivers and streams overflowed their banks with reports of 8 to 10 inches of rapidly flowing water in the streets.  On the east side of Des Moines, four feet of water flooded streets.  Once the flash flooding subsided, areal flooding was a significant problem in Warren, Marion, and Mahaska Counties.  Numerous roads were flooded and closed with countless homes flooded.

Thunderstorm Wind in KOSSUTH, IOWA
From 09-JUN-11 18:10:00 to 09-JUN-11 18:10:00 (CST-6)
Location: ALGONA
Magnitude: 52.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Downed trees in the city blocking a road.  One tree was 2 feet in diameter.

Hail in POLK, IOWA
From 09-JUN-11 19:45:00 to 09-JUN-11 19:45:00 (CST-6)
Location: YOUNGSTOWN
Magnitude: 1.75 
Property damage: 15.00K
Crop damage: 5.00K
Reported by: Broadcast Media

Relayed by dsmweather.com.

Hail in POLK, IOWA
From 09-JUN-11 20:22:00 to 09-JUN-11 20:22:00 (CST-6)
Location: ANKENY
Magnitude: 1.25 
Property damage: 5.00K
Crop damage: 10.00K
Reported by: NWS Employee

Hail in POLK, IOWA
From 09-JUN-11 20:23:00 to 09-JUN-11 20:23:00 (CST-6)
Location: ELKHART
Magnitude: 1.00 
Property damage: 3.00K
Crop damage: 10.00K
Reported by: Trained Spotter

Hail in MARSHALL, IOWA
From 09-JUN-11 20:10:00 to 09-JUN-11 20:10:00 (CST-6)
Location: STATE CENTER
Magnitude: 1.75 
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in POLK, IOWA
From 09-JUN-11 20:19:00 to 09-JUN-11 20:19:00 (CST-6)
Location: ANKENY
Magnitude: 1.00 
Property damage: 1.00K
Crop damage: 10.00K
Reported by: Law Enforcement

Hail in POLK, IOWA
From 09-JUN-11 20:20:00 to 09-JUN-11 20:20:00 (CST-6)
Location: ANKENY
Magnitude: 1.00 
Property damage: 1.00K
Crop damage: 10.00K
Reported by: Trained Spotter

Hail in POLK, IOWA
From 09-JUN-11 20:24:00 to 09-JUN-11 20:24:00 (CST-6)
Location: ANKENY
Magnitude: 1.00 
Property damage: 1.00K
Crop damage: 10.00K
Reported by: NWS Employee

Hail in POLK, IOWA
From 09-JUN-11 20:17:00 to 09-JUN-11 20:17:00 (CST-6)
Location: ORALABOR
Magnitude: 1.50 
Property damage: 3.00K
Crop damage: 10.00K
Reported by: CoCoRaHS

Average size of hail was 1.25 inches with minor tree damage.

Hail in MARSHALL, IOWA
From 09-JUN-11 20:11:00 to 09-JUN-11 20:11:00 (CST-6)
Location: STATE CENTER
Magnitude: 1.75 
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in WARREN, IOWA
From 09-JUN-11 21:16:00 to 09-JUN-11 21:16:00 (CST-6)
Location: INDIANOLA
Magnitude: 1.00 
Property damage: 3.00K
Crop damage: 10.00K
Reported by: Trained Spotter

Hail in WARREN, IOWA
From 09-JUN-11 21:18:00 to 09-JUN-11 21:18:00 (CST-6)
Location: BEECH
Magnitude: 1.25 
Property damage: 5.00K
Crop damage: 10.00K
Reported by: Amateur Radio

Quarter to half dollar size hail.

Hail in MARION, IOWA
From 09-JUN-11 21:52:00 to 09-JUN-11 21:52:00 (CST-6)
Location: PLEASANTVILLE
Magnitude: 1.00 
Property damage: 3.00K
Crop damage: 10.00K
Reported by: Emergency Manager

Hail in MARION, IOWA
From 09-JUN-11 21:56:00 to 09-JUN-11 21:56:00 (CST-6)
Location: PLEASANTVILLE
Magnitude: 1.00 
Property damage: 3.00K
Crop damage: 5.00K
Reported by: Public

Public also reported heavy rainfall.

Flash Flood in MARION, IOWA
From 09-JUN-11 23:54:00 to 10-JUN-11 04:00:00 (CST-6)
Location: KNOXVILLE
Flood cause: Heavy Rain
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Emergency Manager

EM reported several streets flooding with 8 to 10 inches of flowing water.

Flash Flood in WARREN, IOWA
From 10-JUN-11 00:31:00 to 10-JUN-11 04:00:00 (CST-6)
Location: NORWALK
Flood cause: Heavy Rain
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Eight to 10 inches of water flowing rapidly across lawns.

Heavy Rain in MARION, IOWA
From 09-JUN-11 06:04:00 to 10-JUN-11 06:04:00 (CST-6)
Location: PELLA MUNI ARPT
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Rainfall total for the 24 hour period was 4.77 inches.

Heavy Rain in MARION, IOWA
From 09-JUN-11 07:28:00 to 10-JUN-11 07:28:00 (CST-6)
Location: KNOXVILLE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Rainfall for the 24 hour period was 5.46 inches.

Heavy Rain in WARREN, IOWA
From 09-JUN-11 22:00:00 to 10-JUN-11 07:25:00 (CST-6)
Location: SUMMERSET
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported 4.25 inches of rain since 2200 CST last evening.  Some roads are being affected by water.

Heavy Rain in WARREN, IOWA
From 09-JUN-11 06:00:00 to 10-JUN-11 06:00:00 (CST-6)
Location: LACONA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Rainfall over the past 24 hours.

Heavy Rain in WARREN, IOWA
From 08-JUN-11 07:00:00 to 10-JUN-11 07:00:00 (CST-6)
Location: SPRING HILL
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Rainfall total for the past 24 hours was 6.78 inches, with 9.31 over the past 2 days.

Thunderstorm Wind in JASPER, IOWA
From 09-JUN-11 20:20:00 to 09-JUN-11 20:20:00 (CST-6)
Location: NEWTON
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Newspaper

Tree damage occurred in the town of Newton.

Heavy Rain in POLK, IOWA
From 09-JUN-11 00:00:00 to 10-JUN-11 00:00:00 (CST-6)
Location: (DSM)DES MOINES INTL
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Rainfall for the last 24 hours at the Des Moines ASOS was 4.53 inches.

Heavy Rain in POLK, IOWA
From 09-JUN-11 01:14:00 to 10-JUN-11 01:14:00 (CST-6)
Location: GRIMES
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Rainfall total for 24 hours was 4.15 inches.

Heavy Rain in POLK, IOWA
From 09-JUN-11 01:15:00 to 09-JUN-11 22:15:00 (CST-6)
Location: WINDSOR HGTS
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Event total rainfall in Windsor Heights was 4.61 inches.  Soil was saturated with water seeping through basement walls.

Heavy Rain in MADISON, IOWA
From 09-JUN-11 05:52:00 to 10-JUN-11 05:52:00 (CST-6)
Location: BEVINGTON
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Rainfall total for the 24 hour period was 6.70 inches.

Thunderstorm Wind in PALO ALTO, IOWA
From 09-JUN-11 17:12:00 to 09-JUN-11 17:12:00 (CST-6)
Location: AYRSHIRE
Magnitude: 52.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: State Official

Trees were down south of Ayrshire on 380th Ave at 430th and 460th.

Hail in POLK, IOWA
From 09-JUN-11 19:30:00 to 09-JUN-11 19:30:00 (CST-6)
Location: NORWOODVILLE
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Marble to nickel size hail on Interstate 80.

Hail in POLK, IOWA
From 09-JUN-11 19:46:00 to 09-JUN-11 19:46:00 (CST-6)
Location: ANKENY
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 5.00K
Reported by: Amateur Radio

Hail in STORY, IOWA
From 09-JUN-11 19:56:00 to 09-JUN-11 19:56:00 (CST-6)
Location: AMES ARPT
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 10.00K
Reported by: Trained Spotter

At the intersection of Interstate 35 and US Highway 30.

Flash Flood in POLK, IOWA
From 09-JUN-11 20:04:00 to 10-JUN-11 01:35:00 (CST-6)
Location: YOUNGSTOWN
Flood cause: Heavy Rain
Property damage: 250.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Four feet of water covering Vandalia Rd and SE 42nd Street.

Hail in WARREN, IOWA
From 09-JUN-11 21:12:00 to 09-JUN-11 21:12:00 (CST-6)
Location: INDIANOLA
Magnitude: 1.00 
Property damage: 5.00K
Crop damage: 10.00K
Reported by: Emergency Manager

Flash Flood in MARION, IOWA
From 10-JUN-11 03:32:00 to 10-JUN-11 07:30:00 (CST-6)
Location: PELLA
Flood cause: Heavy Rain
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunder Creek over 240th Pl with the road closed due to the water. Deputy reported it looked like white water rapids.

Thunderstorm Wind in STORY, IOWA
From 09-JUN-11 20:45:00 to 09-JUN-11 20:45:00 (CST-6)
Location: ROLAND
Magnitude: 52.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A 3 foot diameter tree was down across the road.

Heavy Rain in MARION, IOWA
From 09-JUN-11 02:12:00 to 10-JUN-11 02:12:00 (CST-6)
Location: SWAN
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Rainfall of 5.21 inches for the past 24 hours measured at a river gauge along the Des Moines river.

Heavy Rain in POLK, IOWA
From 09-JUN-11 02:12:00 to 10-JUN-11 02:12:00 (CST-6)
Location: POLK CITY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

At the Big Creek Marina 5.01 inches of rain fell in the past 24 hours.

Heavy Rain in WARREN, IOWA
From 09-JUN-11 14:00:00 to 10-JUN-11 02:44:00 (CST-6)
Location: ST MARYS
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Rainfall since 1400 CST Thursday was 5.40 inches.

Hail in DAVIS, IOWA
From 09-JUN-11 15:50:00 to 09-JUN-11 15:50:00 (CST-6)
Location: MARK
Magnitude: 1.00 
Property damage: 3.00K
Crop damage: 10.00K
Reported by: Trained Spotter

Hail in POLK, IOWA
From 09-JUN-11 19:18:00 to 09-JUN-11 19:18:00 (CST-6)
Location: (DSM)DES MOINES INTL
Magnitude: 1.25 
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in WARREN, IOWA
From 09-JUN-11 19:23:00 to 09-JUN-11 19:23:00 (CST-6)
Location: NORWALK
Magnitude: 1.50 
Property damage: 5.00K
Crop damage: 10.00K
Reported by: Public

Hail in WARREN, IOWA
From 09-JUN-11 21:15:00 to 09-JUN-11 21:15:00 (CST-6)
Location: INDIANOLA
Magnitude: 1.75 
Property damage: 10.00K
Crop damage: 10.00K
Reported by: Trained Spotter

Mostly half dollar size hail with a few golf ball stones.

Flood in WARREN, IOWA
From 10-JUN-11 04:22:00 to 11-JUN-11 04:00:00 (CST-6)
Location: HARTFORD
Flood cause: Heavy Rain
Property damage: 500.00K
Crop damage: 250.00K
Reported by: Department of Highways

Water over Highway 5 between County Roads S31 and S23 reported by the IDOT.

Flood in MAHASKA, IOWA
From 10-JUN-11 05:45:00 to 11-JUN-11 08:30:00 (CST-6)
Location: EVANS
Flood cause: Heavy Rain
Property damage: 250.00K
Crop damage: 100.00K
Reported by: Department of Highways

Highway 92 was closed due to high water between County Highway T25 and Highway 163.

Hail in POLK, IOWA
From 09-JUN-11 19:25:00 to 09-JUN-11 19:25:00 (CST-6)
Location: DES MOINES
Magnitude: 1.00 
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Northern side of downtown Des Moines.

Hail in POLK, IOWA
From 09-JUN-11 19:35:00 to 09-JUN-11 19:35:00 (CST-6)
Location: CAPITOL HGTS
Magnitude: 1.00 
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in STORY, IOWA
From 09-JUN-11 19:55:00 to 09-JUN-11 19:55:00 (CST-6)
Location: AMES ARPT
Magnitude: 1.00 
Property damage: 3.00K
Crop damage: 10.00K
Reported by: Trained Spotter

Hail in POLK, IOWA
From 09-JUN-11 19:26:00 to 09-JUN-11 19:26:00 (CST-6)
Location: CAPITOL HGTS
Magnitude: 1.75 
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Amateur Radio