Storm Events Database

Event Details

Event Flash Flood
-- Flood Cause Heavy Rain
State IOWA
County/Area PALO ALTO
WFO DMX
Report Source Public
NCDC Data Source CSV
Begin Date 2010-06-26 21:15:00.0 CST-6
Begin Location 0E RUTHVEN
Begin Lat/Lon 43.13/-94.91
End Date 2010-06-26 22:30:00.0 CST-6
End Location 6W GRAETTINGER
End Lat/Lon 43.23/-94.9
Deaths Direct/Indirect 0/0 (fatality details below, when available...)
Injuries Direct/Indirect 0/0
Property Damage 5.00K
Crop Damage 0.00K
Episode Narrative An extremely unstable airmass remained in place over Iowa on the afternoon of the 26th. Low pressure was over southeast South Dakota, with a warm front extending east-southeast into east central Iowa and a cold front extending southwest into northwest Kansas. A 30 t0 40 kt low level jet feed moisture north ahead of the approaching cold front. Surface temperatures warmed into the low 90s with dew points in the low to mid 70s across much of the state. CAPE rose to 5000 to 7000 J/kg ahead of the front with lifted indices of -12 to -15 C. Strong severe weather parameters were present with downdraft CAPE of 1600-1900 J/kg in the prestorm environment and available CAPE in the -10 to -30 C layer of the atmosphere of 1000-1300 J/kg. The freezing level was again very high in the 14,500 to 15,000 foot range. Precipitable water values were somewhat lower than the previous day, though quite high at 1.5 to 1.8 inches. The LCL was a relatively high 1000-1500 meters. The environment had fairly strong shear at 50 kts in northern Iowa, and a weaker 30 kts over the south. A strong cap at 700 mb was present in western Iowa during the mid to late afternoon hours with temperatures above +15 C. To the west of the cap, along the temperature gradient, strong convection developed by mid to late afternoon over southwest Minnesota, southeast South Dakota, into northeast Nebraska. Initially the storms lifted northeast ahead of the cold front. The storms formed into an arc line of storms and progressed east into Iowa. They weakened and became more multi-cellular as they progressed east. Several of the storms produced gusty winds and small hail. A few reports of winds of 60 to 65 MPH were received. Damage was relatively minor for the most part, with it restricted to tree and large tree limbs. One storm caused structural damage on a farm in Winnebago County with roof damage to a shed and 4 grain bins destroyed. Heavy rainfall resulted in some flash flooding. The storms weakened during the early morning hours. Shortly before sunrise, the storms strengthened again as the area became cold pool dominated. Around that time, a wind gust of 70 MPH was recorded at an Iowa RWIS site north of Des Moines, with another gust to 70 MPH measured at an RWIS site in Tama. High winds caused damage to grain bins and buildings on a farmstead in Marion County. In Kossuth County, water was flowing over roads southeast of the airport. In Palo Alto County, flowing water was reported over roads north of Ruthven in a campsite there. Significant flash flooding took place in the Pomeroy area of Calhoun County. Major flash flooding took place in Webster County as well with many roads flooded, some by several feet of water, in the city of Fort Dodge. Thunderstorms moving through central Iowa caused minor urban flooding in Polk County in the Des Moines metro area with a couple of inches of water in intersections and ponding up around a foot deep over roads in low areas.
Event Narrative


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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 1.135M 0.00K
ALGONA KOSSUTH CO. IA 06/26/2010 20:00 CST-6 Flash Flood 0 0 25.00K 0.00K
DOLLIVER EMMET CO. IA 06/26/2010 20:04 CST-6 Thunderstorm Wind 52 kts. EG 0 0 5.00K 0.00K
WELLINGFORD EMMET CO. IA 06/26/2010 20:08 CST-6 Thunderstorm Wind 50 kts. EG 0 0 2.00K 0.00K
ARMSTRONG EMMET CO. IA 06/26/2010 20:19 CST-6 Thunderstorm Wind 52 kts. EG 0 0 5.00K 0.00K
EMMETSBURG PALO ALTO CO. IA 06/26/2010 20:45 CST-6 Thunderstorm Wind 57 kts. EG 0 0 15.00K 0.00K
THOMPSON WINNEBAGO CO. IA 06/26/2010 20:45 CST-6 Thunderstorm Wind 65 kts. EG 0 0 200.00K 0.00K
BUFFALO CENTER WINNEBAGO CO. IA 06/26/2010 20:49 CST-6 Thunderstorm Wind 50 kts. EG 0 0 3.00K 0.00K
MANNING CARROLL CO. IA 06/26/2010 21:00 CST-6 Heavy Rain 0 0 10.00K 0.00K
RENWICK MUNI ARPT HUMBOLDT CO. IA 06/26/2010 21:00 CST-6 Heavy Rain 0 0 10.00K 0.00K
SCARVILLE WINNEBAGO CO. IA 06/26/2010 21:13 CST-6 Thunderstorm Wind 50 kts. EG 0 0 1.00K 0.00K
RUTHVEN PALO ALTO CO. IA 06/26/2010 21:15 CST-6 Flash Flood 0 0 5.00K 0.00K
FT DODGE WEBSTER CO. IA 06/26/2010 22:00 CST-6 Heavy Rain 0 0 100.00K 0.00K
KNOKE CALHOUN CO. IA 06/27/2010 01:34 CST-6 Flash Flood 0 0 25.00K 0.00K
POMEROY CALHOUN CO. IA 06/27/2010 01:34 CST-6 Flash Flood 0 0 50.00K 0.00K
(FOD)FT DODGE MUNI A WEBSTER CO. IA 06/27/2010 02:34 CST-6 Flash Flood 0 0 500.00K 0.00K
ELKHART POLK CO. IA 06/27/2010 03:22 CST-6 Thunderstorm Wind 61 kts. MG 0 0 2.00K 0.00K
TAMA TAMA CO. IA 06/27/2010 03:27 CST-6 Thunderstorm Wind 61 kts. MG 0 0 2.00K 0.00K
URBANDALE POLK CO. IA 06/27/2010 03:30 CST-6 Heavy Rain 0 0 100.00K 0.00K
MELCHER MARION CO. IA 06/27/2010 03:35 CST-6 Thunderstorm Wind 61 kts. EG 0 0 50.00K 0.00K
WESTSIDE CRAWFORD CO. IA 06/27/2010 05:00 CST-6 Flash Flood 0 0 25.00K 0.00K
Totals: 0 0 1.135M 0.00K