Storm Events Database

Event Details

Event Thunderstorm Wind
Magnitude 57 kts.
State IOWA
County/Area PALO ALTO
WFO DMX
Begin Date 06/25/2010 21:25:00 CST-6
Begin Range 1
Begin Azimuth SE
Begin Location EMMETSBURG
Begin Lat/Lon 43.11/-94.68
End Date 06/25/2010 21:25:00 CST-6
Deaths Direct/Indirect 0/0 (fatality details below, when available...)
Injuries Direct/Indirect 0/0
Property Damage 15.00K
Crop Damage 0.00K
Episode Narrative A very unstable airmass was in place over western Iowa and areas to the west. CAPE rose to over 6500 J/kg by late afternoon with the lifted indices falling to -12 to -15 C. Downdraft CAPE as quite high at around 1600 J/kg, while available CAPE in the -10 to -30 C layer of the atmosphere was between 700 and 1000 J/kg. The atmosphere had a strong shear present with 40 to 60 kts The freezing level was quite high, just below 15,000 feet. Precipitable water increased to around 1.5 inches. Strong thunderstorms developed over southern Minnesota. Initially, the thunderstorms moved east. Once they became more rooted in the boundary layer, they moved southeast and propagated nearly due south. The main severe threat was high winds, with numerous reports of tree, power line, and grain bin damage. Winds of 70 MPH were measured in Estherville for example. Seventy MPH winds were reported in Grundy County. The outflow boundary from the complex continued to move southeast, and actually moved all the way into Missouri. Scattered severe weather occurred with this. Seven power poles were snapped in Polk County by the high winds. A wind gust of 62 MPH occurred at the Ottumwa Airport. Flash flooding also became a problem with the antecedent soil conditions nearly saturated. Flash flooding in Emmet County resulted in the closing of Highway 4 near Wallingford and evacuations in the city. A secondary area of thunderstorms formed over northwest Iowa and moved east-southeast into the CWA. Heavy rains caused minor urban flooding in Calhoun County with 6 inches of standing water reported in the city of Pomeroy. Although many of the storms produced small hail, there were very few reports of hail larger than dime size. Reports of hail up to an inch in diameter were received in central Iowa late in the evolution of the system. Lightning struck a house east of Grinnell during the early morning hours around 0330 CST. The house was set on fire with structural damage and damage to contents estimated at $550,000.
Event Narrative Several trees blown down.


All events for this episode:

Location County/Zone St. Date Time T.Z. Type Mag Dth Inj PrD CrD
Totals: 0 0 1.931M 10.00K
SILVER LAKE WORTH CO. IA 06/25/2010 19:45 CST-6 Thunderstorm Wind 52 kts. EG 0 0 2.00K 0.00K
LAKE MILLS WINNEBAGO CO. IA 06/25/2010 19:50 CST-6 Thunderstorm Wind 52 kts. EG 0 0 5.00K 0.00K
TENOLD WORTH CO. IA 06/25/2010 19:55 CST-6 Thunderstorm Wind 50 kts. EG 0 0 2.00K 0.00K
DOLLIVER EMMET CO. IA 06/25/2010 20:00 CST-6 Thunderstorm Wind 57 kts. EG 0 0 15.00K 0.00K
ESTHERVILLE EMMET CO. IA 06/25/2010 20:29 CST-6 Thunderstorm Wind 61 kts. MG 0 0 5.00K 0.00K
WALLINGFORD EMMET CO. IA 06/25/2010 20:44 CST-6 Thunderstorm Wind 61 kts. EG 0 0 50.00K 0.00K
AREDALE BUTLER CO. IA 06/25/2010 21:00 CST-6 Thunderstorm Wind 52 kts. EG 0 0 2.00K 0.00K
DOWS WRIGHT CO. IA 06/25/2010 21:11 CST-6 Thunderstorm Wind 52 kts. EG 0 0 10.00K 0.00K
ALGONA KOSSUTH CO. IA 06/25/2010 21:14 CST-6 Thunderstorm Wind 57 kts. MG 0 0 5.00K 0.00K
GRAETTINGER PALO ALTO CO. IA 06/25/2010 21:15 CST-6 Thunderstorm Wind 54 kts. EG 0 0 15.00K 0.00K
CLARION WRIGHT CO. IA 06/25/2010 21:23 CST-6 Thunderstorm Wind 52 kts. EG 0 0 15.00K 0.00K
EMMETSBURG PALO ALTO CO. IA 06/25/2010 21:25 CST-6 Thunderstorm Wind 57 kts. EG 0 0 15.00K 0.00K
OAKLAND FRANKLIN CO. IA 06/25/2010 21:27 CST-6 Thunderstorm Wind 52 kts. EG 0 0 10.00K 0.00K
POPEJOY FRANKLIN CO. IA 06/25/2010 21:29 CST-6 Thunderstorm Wind 57 kts. EG 0 0 50.00K 0.00K
OAKLAND FRANKLIN CO. IA 06/25/2010 21:30 CST-6 Thunderstorm Wind 52 kts. EG 0 0 5.00K 0.00K
WELLSBURG GRUNDY CO. IA 06/25/2010 21:31 CST-6 Thunderstorm Wind 61 kts. EG 0 0 3.00K 0.00K
IOWA FALLS HARDIN CO. IA 06/25/2010 21:36 CST-6 Thunderstorm Wind 56 kts. EG 0 0 5.00K 0.00K
NEW HARTFORD BUTLER CO. IA 06/25/2010 21:39 CST-6 Thunderstorm Wind 52 kts. EG 0 0 3.00K 0.00K
STEAMBOAT ROCK HARDIN CO. IA 06/25/2010 21:45 CST-6 Thunderstorm Wind 50 kts. MG 0 0 2.00K 0.00K
CLARION WRIGHT CO. IA 06/25/2010 22:14 CST-6 Heavy Rain 0 0 0.00K 0.00K
NEVADA STORY CO. IA 06/25/2010 22:27 CST-6 Thunderstorm Wind 52 kts. EG 0 0 5.00K 0.00K
WALLINGFORD EMMET CO. IA 06/25/2010 22:28 CST-6 Heavy Rain 0 0 0.00K 0.00K
WELLINGFORD EMMET CO. IA 06/25/2010 22:40 CST-6 Flash Flood 0 0 150.00K 0.00K
ORALABOR POLK CO. IA 06/25/2010 23:05 CST-6 Thunderstorm Wind 69 kts. EG 0 0 25.00K 0.00K
HOLMES WRIGHT CO. IA 06/25/2010 23:15 CST-6 Flash Flood 0 0 100.00K 0.00K
DALLAS CENTER DALLAS CO. IA 06/25/2010 23:30 CST-6 Thunderstorm Wind 52 kts. EG 0 0 25.00K 0.00K
(OTM)OTTUMWA INDSTRL WAPELLO CO. IA 06/26/2010 00:14 CST-6 Thunderstorm Wind 54 kts. MG 0 0 2.00K 0.00K
POMEROY CALHOUN CO. IA 06/26/2010 01:24 CST-6 Heavy Rain 0 0 50.00K 0.00K
WELLINGFORD EMMET CO. IA 06/26/2010 02:45 CST-6 Flash Flood 0 0 500.00K 0.00K
GRINNELL POWESHIEK CO. IA 06/26/2010 03:30 CST-6 Lightning 0 0 550.00K 0.00K
AMES STORY CO. IA 06/26/2010 03:32 CST-6 Hail 0.88 in. 0 0 0.00K 5.00K
HUMBOLDT MUNI ARPT HUMBOLDT CO. IA 06/26/2010 05:00 CST-6 Flood 0 0 300.00K 0.00K
DAKOTA CITY HUMBOLDT CO. IA 06/26/2010 05:48 CST-6 Heavy Rain 0 0 0.00K 0.00K
FT DODGE WEBSTER CO. IA 06/26/2010 06:35 CST-6 Heavy Rain 0 0 0.00K 0.00K
INDIANOLA WARREN CO. IA 06/26/2010 07:07 CST-6 Hail 1.00 in. 0 0 5.00K 5.00K
Totals: 0 0 1.931M 10.00K