Storm Events Database

Event Details

Event Thunderstorm Wind
Magnitude 52 kts.
State IOWA
County/Area PALO ALTO
WFO DMX
Report Source State Official
NCDC Data Source CSV
Begin Date 2011-06-09 17:12:00.0 CST-6
End Date 2011-06-09 17:12:00.0 CST-6
Deaths Direct/Indirect 0/0 (fatality details below, when available...)
Injuries Direct/Indirect 0/0
Property Damage 10.00K
Crop Damage 0.00K
Episode Narrative 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.
Event Narrative Trees were down south of Ayrshire on 380th Ave at 430th and 460th.


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All events for this episode:

Location County/Zone St. Date Time T.Z. Type Mag Dth Inj PrD CrD
Totals: 0 0 1.412M 515.00K
WARREN CO. WARREN CO. IA 06/08/2011 07:00 CST-6 Heavy Rain 0 0 0.00K 0.00K
POLK CO. POLK CO. IA 06/09/2011 00:00 CST-6 Heavy Rain 0 0 0.00K 0.00K
POLK CO. POLK CO. IA 06/09/2011 01:14 CST-6 Heavy Rain 0 0 0.00K 0.00K
POLK CO. POLK CO. IA 06/09/2011 01:15 CST-6 Heavy Rain 0 0 0.00K 0.00K
POLK CO. POLK CO. IA 06/09/2011 02:12 CST-6 Heavy Rain 0 0 0.00K 0.00K
MARION CO. MARION CO. IA 06/09/2011 02:12 CST-6 Heavy Rain 0 0 0.00K 0.00K
MADISON CO. MADISON CO. IA 06/09/2011 05:52 CST-6 Heavy Rain 0 0 0.00K 0.00K
WARREN CO. WARREN CO. IA 06/09/2011 06:00 CST-6 Heavy Rain 0 0 0.00K 0.00K
MARION CO. MARION CO. IA 06/09/2011 06:04 CST-6 Heavy Rain 0 0 0.00K 0.00K
MARION CO. MARION CO. IA 06/09/2011 07:28 CST-6 Heavy Rain 0 0 0.00K 0.00K
WARREN CO. WARREN CO. IA 06/09/2011 14:00 CST-6 Heavy Rain 0 0 0.00K 0.00K
DAVIS CO. DAVIS CO. IA 06/09/2011 15:50 CST-6 Hail 1.00 in. 0 0 3.00K 10.00K
PALO ALTO CO. PALO ALTO CO. IA 06/09/2011 17:12 CST-6 Thunderstorm Wind 52 kts. EG 0 0 10.00K 0.00K
KOSSUTH CO. KOSSUTH CO. IA 06/09/2011 18:10 CST-6 Thunderstorm Wind 52 kts. EG 0 0 5.00K 0.00K
POLK CO. POLK CO. IA 06/09/2011 19:18 CST-6 Hail 1.25 in. 0 0 5.00K 0.00K
WARREN CO. WARREN CO. IA 06/09/2011 19:23 CST-6 Hail 1.50 in. 0 0 5.00K 10.00K
POLK CO. POLK CO. IA 06/09/2011 19:25 CST-6 Hail 1.00 in. 0 0 5.00K 0.00K
POLK CO. POLK CO. IA 06/09/2011 19:26 CST-6 Hail 1.75 in. 0 0 25.00K 0.00K
POLK CO. POLK CO. IA 06/09/2011 19:30 CST-6 Hail 0.88 in. 0 0 0.00K 0.00K
POLK CO. POLK CO. IA 06/09/2011 19:35 CST-6 Hail 1.00 in. 0 0 3.00K 0.00K
POLK CO. POLK CO. IA 06/09/2011 19:45 CST-6 Hail 1.75 in. 0 0 15.00K 5.00K
POLK CO. POLK CO. IA 06/09/2011 19:46 CST-6 Hail 0.88 in. 0 0 0.00K 5.00K
STORY CO. STORY CO. IA 06/09/2011 19:55 CST-6 Hail 1.00 in. 0 0 3.00K 10.00K
STORY CO. STORY CO. IA 06/09/2011 19:56 CST-6 Hail 0.88 in. 0 0 0.00K 10.00K
POLK CO. POLK CO. IA 06/09/2011 20:04 CST-6 Flash Flood 0 0 250.00K 0.00K
MARSHALL CO. MARSHALL CO. IA 06/09/2011 20:10 CST-6 Hail 1.75 in. 0 0 15.00K 0.00K
MARSHALL CO. MARSHALL CO. IA 06/09/2011 20:11 CST-6 Hail 1.75 in. 0 0 15.00K 0.00K
POLK CO. POLK CO. IA 06/09/2011 20:17 CST-6 Hail 1.50 in. 0 0 3.00K 10.00K
POLK CO. POLK CO. IA 06/09/2011 20:19 CST-6 Hail 1.00 in. 0 0 1.00K 10.00K
POLK CO. POLK CO. IA 06/09/2011 20:20 CST-6 Hail 1.00 in. 0 0 1.00K 10.00K
JASPER CO. JASPER CO. IA 06/09/2011 20:20 CST-6 Thunderstorm Wind 50 kts. EG 0 0 5.00K 0.00K
POLK CO. POLK CO. IA 06/09/2011 20:22 CST-6 Hail 1.25 in. 0 0 5.00K 10.00K
POLK CO. POLK CO. IA 06/09/2011 20:23 CST-6 Hail 1.00 in. 0 0 3.00K 10.00K
POLK CO. POLK CO. IA 06/09/2011 20:24 CST-6 Hail 1.00 in. 0 0 1.00K 10.00K
STORY CO. STORY CO. IA 06/09/2011 20:45 CST-6 Thunderstorm Wind 52 kts. EG 0 0 5.00K 0.00K
WARREN CO. WARREN CO. IA 06/09/2011 21:12 CST-6 Hail 1.00 in. 0 0 5.00K 10.00K
WARREN CO. WARREN CO. IA 06/09/2011 21:15 CST-6 Hail 1.75 in. 0 0 10.00K 10.00K
WARREN CO. WARREN CO. IA 06/09/2011 21:16 CST-6 Hail 1.00 in. 0 0 3.00K 10.00K
WARREN CO. WARREN CO. IA 06/09/2011 21:18 CST-6 Hail 1.25 in. 0 0 5.00K 10.00K
MARION CO. MARION CO. IA 06/09/2011 21:52 CST-6 Hail 1.00 in. 0 0 3.00K 10.00K
MARION CO. MARION CO. IA 06/09/2011 21:56 CST-6 Hail 1.00 in. 0 0 3.00K 5.00K
WARREN CO. WARREN CO. IA 06/09/2011 22:00 CST-6 Heavy Rain 0 0 0.00K 0.00K
MARION CO. MARION CO. IA 06/09/2011 23:54 CST-6 Flash Flood 0 0 100.00K 0.00K
WARREN CO. WARREN CO. IA 06/10/2011 00:31 CST-6 Flash Flood 0 0 100.00K 0.00K
MARION CO. MARION CO. IA 06/10/2011 03:32 CST-6 Flash Flood 0 0 50.00K 0.00K
WARREN CO. WARREN CO. IA 06/10/2011 04:22 CST-6 Flood 0 0 500.00K 250.00K
MAHASKA CO. MAHASKA CO. IA 06/10/2011 05:45 CST-6 Flood 0 0 250.00K 100.00K
Totals: 0 0 1.412M 515.00K