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Storm Events Database
Event Details
| Event | Thunderstorm Wind |
| Magnitude | 52 kts. |
| State | IOWA |
| County/Area | PALO ALTO |
| WFO | DMX |
| Begin Date | 06/09/2011 17:12:00 CST-6 |
| End Date | 06/09/2011 17:12:00 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. |
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 |
