Storm Events Database

Event Details

Event Heavy Rain
State IOWA
County/Area GRUNDY
WFO DMX
Report Source COOP Observer
NCDC Data Source CSV
Begin Date 2009-04-26 06:00:00.0 CST-6
Begin Location 1SE CONRAD
Begin Lat/Lon 42.22/-92.87
End Date 2009-04-27 06:00:00.0 CST-6
Deaths Direct/Indirect 0/0 (fatality details below, when available...)
Injuries Direct/Indirect 0/0
Property Damage 0.00K
Crop Damage 0.00K
Episode Narrative The warm front from the previous night lifted north of the state as low pressure pushed northeast out of Kansas across northwest Iowa. The atmosphere became quite unstable. Lifted indices fell to -6 to -8, with CAPE values in the 1000 to 2000 J/kg range. CAPE in the -10 to -30 C. layer of the atmosphere was between 200 and 500 J/kg. Downdraft CAPE was in the 400 to 700 J/kg range. The effective shear was between 35 and 55 kts. The freezing level was consistent with what it had been the previous few events, at 11,900 feet. Thunderstorms developed in several lines. The main issue with the thunderstorms was heavy rain as precipitable water values were around 1.6 inches. The 850 mb feed into the system was between 45 and 55 kts. Spotty reports of severe wind were received along the line with some relatively minor damage. Some farm outbuilding damage occurred with the high winds and a few trees were blown over. The roof and siding were both damaged on a house at Sun Valley Lake in Ringgold County as a brief tornado touched down there. Part of the roof was actually removed by 80 MPH straight line winds. Many of the storms produced hail, however it remained below severe limits. Flooding was widespread with flash flooding reported in several counties. Rainfall of 4 to 7 inches occurred in a few areas, especially in Guthrie and Audubon Counties. A band widespread 2 to 4 inch rainfall extended all the way across the CWA from the southwest corner to the northeast in the Waterloo area. Some of the heavier totals included 8.5 inches in Waterloo, 7.4 inches in Hudson, both in Black Hawk County, and 7 inches in Hardin County in the Whitten area. Numerous reports of 24 to 36 hour rainfall totals were received. They ranged from 3 1/4 to over 8 inches. As the thunderstorms were moving east of the area, lightning struck a house in Altoona setting it on fire. The house was severely damaged. Nobody was home at the time, however fire fighters were able to save the family dog.
Event Narrative Rainfall of 3.51 inches in past 24 hours.


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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 0 575.00K 0.00K
ALTOONA POLK CO. IA 04/25/2009 05:30 CST-6 Heavy Rain 0 0 0.00K 0.00K
GLADBROOK TAMA CO. IA 04/25/2009 05:40 CST-6 Heavy Rain 0 0 0.00K 0.00K
DUNKERTON BLACK HAWK CO. IA 04/25/2009 07:30 CST-6 Heavy Rain 0 0 0.00K 0.00K
HUDSON BLACK HAWK CO. IA 04/25/2009 07:30 CST-6 Heavy Rain 0 0 0.00K 0.00K
TRAER MUNI ARPT TAMA CO. IA 04/25/2009 07:54 CST-6 Heavy Rain 0 0 0.00K 0.00K
ADAIR ADAIR CO. IA 04/25/2009 08:00 CST-6 Heavy Rain 0 0 0.00K 0.00K
LOVINGTON POLK CO. IA 04/25/2009 18:00 CST-6 Heavy Rain 0 0 0.00K 0.00K
REINBECK GRUNDY CO. IA 04/26/2009 05:40 CST-6 Heavy Rain 0 0 0.00K 0.00K
CONRAD GRUNDY CO. IA 04/26/2009 06:00 CST-6 Heavy Rain 0 0 0.00K 0.00K
GARWIN TAMA CO. IA 04/26/2009 06:00 CST-6 Heavy Rain 0 0 0.00K 0.00K
JAMAICA GUTHRIE CO. IA 04/26/2009 06:00 CST-6 Heavy Rain 0 0 0.00K 0.00K
MARSHALLTOWN MARSHALL CO. IA 04/26/2009 06:00 CST-6 Heavy Rain 0 0 0.00K 0.00K
MARSHALLTOWN MARSHALL CO. IA 04/26/2009 06:00 CST-6 Heavy Rain 0 0 0.00K 0.00K
PERRY DALLAS CO. IA 04/26/2009 06:00 CST-6 Heavy Rain 0 0 0.00K 0.00K
BOONE BOONE CO. IA 04/26/2009 07:00 CST-6 Heavy Rain 0 0 0.00K 0.00K
BOONE MUNI ARPT BOONE CO. IA 04/26/2009 07:30 CST-6 Heavy Rain 0 0 0.00K 0.00K
HUDSON BLACK HAWK CO. IA 04/26/2009 07:30 CST-6 Heavy Rain 0 0 0.00K 0.00K
ONTARIO STORY CO. IA 04/26/2009 07:30 CST-6 Heavy Rain 0 0 0.00K 0.00K
GUTHRIE CENTER GUTHRIE CO. IA 04/26/2009 08:00 CST-6 Heavy Rain 0 0 15.00K 0.00K
WHITTEN HARDIN CO. IA 04/26/2009 09:00 CST-6 Heavy Rain 0 0 0.00K 0.00K
WATERLOO BLACK HAWK CO. IA 04/26/2009 14:57 CST-6 Flash Flood 0 0 50.00K 0.00K
GUTHRIE CENTER GUTHRIE CO. IA 04/26/2009 16:05 CST-6 Flash Flood 0 0 25.00K 0.00K
GUTHRIE CENTER GUTHRIE CO. IA 04/26/2009 16:05 CST-6 Flash Flood 0 0 25.00K 0.00K
PANORA GUTHRIE CO. IA 04/26/2009 16:05 CST-6 Flash Flood 0 0 10.00K 0.00K
ADAIR GUTHRIE CO. IA 04/26/2009 16:40 CST-6 Flash Flood 0 0 10.00K 0.00K
ADAIR ADAIR CO. IA 04/26/2009 16:40 CST-6 Flash Flood 0 0 10.00K 0.00K
MONTEITH GUTHRIE CO. IA 04/26/2009 16:50 CST-6 Flash Flood 0 0 10.00K 0.00K
FANSLERS GUTHRIE CO. IA 04/26/2009 17:00 CST-6 Flash Flood 0 0 10.00K 0.00K
BENTON RINGGOLD CO. IA 04/26/2009 17:05 CST-6 Thunderstorm Wind 56 kts. EG 0 0 30.00K 0.00K
ELLSTON RINGGOLD CO. IA 04/26/2009 17:08 CST-6 Tornado EF0 0 0 100.00K 0.00K
BEAMAN MARSHALL CO. IA 04/26/2009 17:13 CST-6 Thunderstorm Wind 56 kts. EG 0 0 25.00K 0.00K
MARSHALLTOWN MARSHALL CO. IA 04/26/2009 17:42 CST-6 Flash Flood 0 0 15.00K 0.00K
MARSHALLTOWN ARPT MARSHALL CO. IA 04/26/2009 17:42 CST-6 Flash Flood 0 0 10.00K 0.00K
MILO WARREN CO. IA 04/26/2009 17:43 CST-6 Thunderstorm Wind 52 kts. EG 0 0 5.00K 0.00K
NORTH BRANCH GUTHRIE CO. IA 04/26/2009 17:44 CST-6 Flash Flood 0 0 20.00K 0.00K
CHARITON MUNI ARPT LUCAS CO. IA 04/26/2009 17:52 CST-6 Thunderstorm Wind 54 kts. MG 0 0 0.00K 0.00K
CHARITON MUNI ARPT LUCAS CO. IA 04/26/2009 17:56 CST-6 Thunderstorm Wind 54 kts. MG 0 0 0.00K 0.00K
CHARITON MUNI ARPT LUCAS CO. IA 04/26/2009 17:56 CST-6 Thunderstorm Wind 56 kts. EG 0 0 10.00K 0.00K
NEPAS MARION CO. IA 04/26/2009 18:00 CST-6 Thunderstorm Wind 56 kts. EG 0 0 10.00K 0.00K
NEWTON JASPER CO. IA 04/26/2009 18:00 CST-6 Heavy Rain 0 0 0.00K 0.00K
WATERLOO BLACK HAWK CO. IA 04/26/2009 18:23 CST-6 Flash Flood 0 0 10.00K 0.00K
PELLA MARION CO. IA 04/26/2009 18:32 CST-6 Thunderstorm Wind 53 kts. MG 0 0 0.00K 0.00K
BAGLEY GUTHRIE CO. IA 04/26/2009 18:40 CST-6 Flash Flood 0 0 10.00K 0.00K
HERNDON GUTHRIE CO. IA 04/26/2009 18:40 CST-6 Flash Flood 0 0 15.00K 0.00K
JAMAICA GUTHRIE CO. IA 04/26/2009 18:40 CST-6 Flash Flood 0 0 10.00K 0.00K
MARSHALLTOWN MARSHALL CO. IA 04/26/2009 19:03 CST-6 Flash Flood 0 0 10.00K 0.00K
MARSHALLTOWN MARSHALL CO. IA 04/26/2009 19:03 CST-6 Flash Flood 0 0 10.00K 0.00K
WATERLOO RANCH ARPT BLACK HAWK CO. IA 04/26/2009 20:03 CST-6 Flash Flood 0 0 5.00K 0.00K
IVY POLK CO. IA 04/27/2009 00:30 CST-6 Lightning 0 0 75.00K 0.00K
KNOXVILLE ARPT MARION CO. IA 04/27/2009 02:00 CST-6 Flood 0 0 5.00K 0.00K
LUCAS LUCAS CO. IA 04/27/2009 02:00 CST-6 Flood 0 0 20.00K 0.00K
MELCHER MARION CO. IA 04/27/2009 02:00 CST-6 Flood 0 0 5.00K 0.00K
OTLEY MARION CO. IA 04/27/2009 02:00 CST-6 Flood 0 0 10.00K 0.00K
Totals: 0 0 575.00K 0.00K