Storm Events Database

Event Details

Event Flash Flood
-- Flood Cause Heavy Rain
State IOWA
County/Area PALO ALTO
WFO DMX
Begin Date 06/23/2010 00:20:00 CST-6
Begin Range 1
Begin Azimuth SE
Begin Location EMMETSBURG
Begin Lat/Lon 43.11/-94.68
End Date 06/23/2010 06:00:00 CST-6
End Range 2
End Azimuth SSE
End Location OSGOOD
End Lat/Lon 43.17/-94.71
Deaths Direct/Indirect 0/0 (fatality details below, when available...)
Injuries Direct/Indirect 0/0
Property Damage 20.00K
Crop Damage 0.00K
Episode Narrative A very unstable airmass was in place over Iowa during the late afternoon and evening of the 22nd. Surface temperatures warmed into the upper 80s to low 90s over much of the state with dew point temperatures rising into the mid 70s to low 80s. CAPE values increased to over 6000 J/kg over the southern half of the state with lifted indices around -12 C. Deep moisture flowed into the state both at low levels as well with the presence of a prominent tropical feed on the water vapor satellite imagery. Precipitable water values increased to 1.8 to 2.2 inches over southern Iowa as moisture pooled. Significant shear was present with effective shear of 45 to 60 kts over northern Iowa. Downdraft CAPE was over 1000 J/kg, while the available CAPE in the -10 to -30 C layer of the atmosphere was in the 800 to 1200 J/kg range. Hail was somewhat limited however with the freezing level between 14,500 and 15,500 feet. Temperatures at the 700 mb level rose to +15 C over southwest Iowa by evening. A strong upper level shortwave lifted northeast out of Colorado during the overnight into the early morning hours of the 22nd into the 23rd. A cold front approached Iowa from the northwest and moved into the northwestern counties by sunrise on the 23rd. Thunderstorms were slow to develop initially due to a strong cap in place over the state. After sunset, explosive development took place over northwest into north central Iowa. Several tornadoes touched down over northern Iowa. None of them were on the ground for an extended period of time however. One touched down in the Sac City area of Sac County, another in Humboldt west of Humboldt. A third tornado was on the ground for a few minutes in the Eagle Grove area. A brief touchdown occurred in Franklin County north of Iowa Falls. A tornado touched down just west of Tripoli. It obliterated an abandoned barn with a brief touchdown. The tornado was one of the stronger of the day at EF1 strength. Funnel clouds were numerous in spite of the darkness due to the vivid lightning and the ability to see them. There were several hail reports, with some of the hail reaching golf ball in size in Winnebago and Kossuth Counties. High winds were a more significant problem with the event as it developed in to an upscale MCC. Numerous reports of downed trees and power lines were received. A semi was overturned on I-35 at milepost 154 by high wind, with another 10 miles farther north. Damage to homes and barns was reported in Bremer and Black Hawk Counties as well. One storm produced a narrow microburst just west of Tripoli with winds estimated at 95 to 100 MPH based on a NWS storm survey. Three homes were damaged with 2 of them serious. Some outbuildings were also damaged by this microburst. The storms also produced very heavy rainfall. Flash flooding took place in several counties, including Wright, Franklin, and Palo Alto. Extensive street flooding took place in Clarion in Wright County with power out in most of the city. In addition, U.S. Highway 69 and Iowa Highway 3 were under water. U.S. Highway 18 was overtopped by high water in 2 places between Spencer and Emmetsburg in Palo Alto County. Roads were under water near Sheffield in Franklin County. Rainfall was heavy with amounts of 4 to 7 inches reported in a band extending from eastern Palo Alto, through Humboldt and Wright Counties, into Franklin County. Heavy rain flooded roads and resulted in evacuations in the town of Dumont in Butler County. The rain fell in just a few hours time. Following the flash flooding, areal flooding continued in parts of the area with highways remaining closed. Some local flooding was also reported in Warren County, east of the Carlisle area.
Event Narrative KICD reported that Highway 18 was under water in 2 places between Spencer and Emmetsburg.


All events for this episode:

Location County/Zone St. Date Time T.Z. Type Mag Dth Inj PrD CrD
Totals: 0 0 1.839M 102.00K
LAKE VIEW SAC CO. IA 06/22/2010 19:49 CST-6 Funnel Cloud 0 0 0.00K 0.00K
UNIQUE HUMBOLDT CO. IA 06/22/2010 20:12 CST-6 Tornado EF0 0 0 0.00K 2.00K
LYTTON SAC CO. IA 06/22/2010 20:15 CST-6 Tornado EF0 0 0 0.00K 5.00K
LYTTON SAC CO. IA 06/22/2010 20:37 CST-6 Funnel Cloud 0 0 0.00K 0.00K
GERMAN VLY KOSSUTH CO. IA 06/22/2010 20:49 CST-6 Hail 1.75 in. 0 0 5.00K 10.00K
DAKOTA CITY HUMBOLDT CO. IA 06/22/2010 20:50 CST-6 Thunderstorm Wind 57 kts. EG 0 0 10.00K 0.00K
POMEROY CALHOUN CO. IA 06/22/2010 20:55 CST-6 Hail 0.88 in. 0 0 0.00K 0.00K
BUFFALO CENTER WINNEBAGO CO. IA 06/22/2010 20:57 CST-6 Hail 1.75 in. 0 0 10.00K 25.00K
RENWICK MUNI ARPT HUMBOLDT CO. IA 06/22/2010 21:00 CST-6 Heavy Rain 0 0 0.00K 0.00K
THOR HUMBOLDT CO. IA 06/22/2010 21:10 CST-6 Funnel Cloud 0 0 0.00K 0.00K
THOR HUMBOLDT CO. IA 06/22/2010 21:10 CST-6 Funnel Cloud 0 0 0.00K 0.00K
POMEROY CALHOUN CO. IA 06/22/2010 21:10 CST-6 Thunderstorm Wind 50 kts. EG 0 0 2.00K 0.00K
EAGLE GROVE ARPT WRIGHT CO. IA 06/22/2010 21:25 CST-6 Tornado EF0 0 0 0.00K 5.00K
EAGLE GROVE WRIGHT CO. IA 06/22/2010 21:30 CST-6 Thunderstorm Wind 52 kts. EG 0 0 5.00K 0.00K
EAGLE GROVE WRIGHT CO. IA 06/22/2010 21:30 CST-6 Thunderstorm Wind 52 kts. EG 0 0 10.00K 0.00K
EAGLE GROVE WRIGHT CO. IA 06/22/2010 21:39 CST-6 Funnel Cloud 0 0 0.00K 0.00K
HOLMES WRIGHT CO. IA 06/22/2010 21:48 CST-6 Thunderstorm Wind 52 kts. EG 0 0 5.00K 0.00K
EAGLE GROVE WRIGHT CO. IA 06/22/2010 21:50 CST-6 Thunderstorm Wind 52 kts. EG 0 0 10.00K 0.00K
FT DODGE WEBSTER CO. IA 06/22/2010 21:56 CST-6 Funnel Cloud 0 0 0.00K 0.00K
CLARION WRIGHT CO. IA 06/22/2010 21:59 CST-6 Thunderstorm Wind 52 kts. EG 0 0 10.00K 0.00K
CLARION WRIGHT CO. IA 06/22/2010 22:22 CST-6 Thunderstorm Wind 52 kts. EG 0 0 10.00K 0.00K
DELOIT CRAWFORD CO. IA 06/22/2010 22:40 CST-6 Thunderstorm Wind 52 kts. EG 0 0 2.00K 0.00K
COULTER FRANKLIN CO. IA 06/22/2010 22:50 CST-6 Thunderstorm Wind 52 kts. EG 0 0 20.00K 0.00K
DOWS WRIGHT CO. IA 06/22/2010 22:50 CST-6 Thunderstorm Wind 52 kts. EG 0 0 20.00K 0.00K
LATIMER FRANKLIN CO. IA 06/22/2010 22:52 CST-6 Thunderstorm Wind 67 kts. MG 0 0 10.00K 0.00K
IOWA FALLS HARDIN CO. IA 06/22/2010 23:11 CST-6 Funnel Cloud 0 0 0.00K 0.00K
GENEVA FRANKLIN CO. IA 06/22/2010 23:38 CST-6 Thunderstorm Wind 52 kts. MG 0 0 5.00K 0.00K
FLORENCE WRIGHT CO. IA 06/22/2010 23:40 CST-6 Flash Flood 0 0 500.00K 25.00K
GENEVA FRANKLIN CO. IA 06/22/2010 23:40 CST-6 Thunderstorm Wind 52 kts. MG 0 0 5.00K 0.00K
HAMPTON MUNI ARPT FRANKLIN CO. IA 06/23/2010 00:02 CST-6 Flash Flood 0 0 100.00K 10.00K
EMMETSBURG PALO ALTO CO. IA 06/23/2010 00:20 CST-6 Flash Flood 0 0 20.00K 0.00K
AUSTINVILLE BUTLER CO. IA 06/23/2010 00:52 CST-6 Thunderstorm Wind 52 kts. EG 0 0 5.00K 0.00K
CLARION WRIGHT CO. IA 06/23/2010 00:52 CST-6 Flash Flood 0 0 50.00K 10.00K
BREMER BREMER CO. IA 06/23/2010 01:16 CST-6 Thunderstorm Wind 83 kts. EG 0 0 350.00K 0.00K
TRIPOLI BREMER CO. IA 06/23/2010 01:16 CST-6 Thunderstorm Wind 83 kts. EG 0 0 50.00K 0.00K
TRIPOLI BREMER CO. IA 06/23/2010 01:17 CST-6 Thunderstorm Wind 87 kts. EG 0 0 50.00K 0.00K
TRIPOLI BREMER CO. IA 06/23/2010 01:18 CST-6 Tornado EF1 0 0 10.00K 0.00K
SHEFFIELD FRANKLIN CO. IA 06/23/2010 01:20 CST-6 Flash Flood 0 0 25.00K 0.00K
WATERLOO BLACK HAWK CO. IA 06/23/2010 01:25 CST-6 Thunderstorm Wind 69 kts. EG 0 0 50.00K 0.00K
SUMNER BREMER CO. IA 06/23/2010 01:27 CST-6 Thunderstorm Wind 74 kts. EG 0 0 50.00K 0.00K
SUMNER BREMER CO. IA 06/23/2010 01:28 CST-6 Thunderstorm Wind 65 kts. EG 0 0 20.00K 0.00K
WATERLOO BLACK HAWK CO. IA 06/23/2010 01:30 CST-6 Thunderstorm Wind 52 kts. EG 0 0 25.00K 0.00K
DEWAR BLACK HAWK CO. IA 06/23/2010 01:30 CST-6 Thunderstorm Wind 54 kts. EG 0 0 10.00K 0.00K
WATERLOO BLACK HAWK CO. IA 06/23/2010 01:45 CST-6 Thunderstorm Wind 57 kts. EG 0 0 25.00K 0.00K
HOLMES WRIGHT CO. IA 06/23/2010 08:49 CST-6 Flood 0 0 100.00K 10.00K
HAMPTON FRANKLIN CO. IA 06/23/2010 08:52 CST-6 Flood 0 0 10.00K 0.00K
DUMONT BUTLER CO. IA 06/23/2010 18:33 CST-6 Flood 0 0 250.00K 0.00K
Totals: 0 0 1.839M 102.00K