A very unstable airmass was in place over Iowa as a cold front approached from the west.  High temperatures the previous day were in the upper 80s and 90s for the most part, with 101 at Fairfield.  Dewpoint readings were in the 70s east to near 80 over the west.  CAPE was in the 4000 to 5000 J/kg range with lifted indices of -8 to -11 C.  Downdraft CAPE was quite high, 1200-1400 J/kg.  CAPE in the -10 to -30 C layer of the atmosphere was between 300 and 500 J/kg.  The atmosphere was quite strongly sheared with 45 to 60 kts of shear.  Precipitable water was low, only 1 to 1.5 inches.  With the relatively dry air, the LCL was between 1500 and 2500 meters.  The airmass was also quite warm with the freezing level around 15,600 feet.  Thunderstorms formed in two clusters.  One extended from Minnesota southwest into eastern South Dakota.  The other area was over central Nebraska.  The convective area from South Dakota dropped southeast into Iowa during the late evening hours.  It produced high winds and hail as it did.  Hail was not the major mode of severe weather.  Most of the larger hail occurred during the early stages of the storm.  Golf ball size hail fell west of Graettinger in Palo Alto County for the largest hail report.  The cluster of storms organized into a small derecho as it approached Fort Dodge.  The derecho raced southeast through the Des Moines area and into southeast Iowa.  It produced some hail as it did, but by in large high winds were the primary threat.  Winds of 60 to 75 MPH were common, causing considerable tree damage.  High winds of 65 to 75 MPH roared through Ames.  A shelter at the Iowa State Veterinary Medicine School was blown over.  Several horses were injured by the collapse.  University officials has to euthanize one horse due to severe injuries.  A measured wind gust of 84 MPH was recorded on the northwest side of the Des Moines Metro area.  Power was knocked out to nearly 40,000 customers in central Iowa by the storms.  Damage reports from along the path of the derecho were widespread.  Grain bins were destroyed as well as numerous out buildings.  Tree and power line damage was extensive all the way from the Minnesota border through south central Iowa.  Heavy rain was also an issue with the storms.  Rainfall of 1 to 2 inches per hour fell with the storms from Fort Dodge into the Des Moines area.  Flash flooding was reported in Marion County.  Heavy rainfall of 2 to 4 inches in under 2 hours flooded city streets in Knoxville, some 4 feet deep, with cars stalled in city streets.  Water was also over the road southeast of Melcher-Dallas in Marion County.  Flash flooding was reported in Webster City.  Flooding blew manhole covers off and stalled several cars in the city.  As the storm moved through the Raymond area of Black Hawk County, lightning struck a house.  It blew a basketball size hole in the roof and caused electrical damage to the house and some structural damage to ceilings.

Hail in EMMET, IOWA
From 17-JUL-10 22:10:00 to 17-JUL-10 22:10:00 (CST-6)
Location: ESTHERVILLE
Magnitude: 1.00 
Property damage: 1.00K
Crop damage: 10.00K
Reported by: Trained Spotter

Mostly dime to nickel size hail reported.

Hail in POCAHONTAS, IOWA
From 17-JUL-10 23:38:00 to 17-JUL-10 23:38:00 (CST-6)
Location: PLOVER
Magnitude: 1.00 
Property damage: 1.00K
Crop damage: 10.00K
Reported by: Fire Department/Rescue

Hail report was relayed by KICD radio in Spencer.

Thunderstorm Wind in HUMBOLDT, IOWA
From 18-JUL-10 00:05:00 to 18-JUL-10 00:05:00 (CST-6)
Location: DAKOTA CITY
Magnitude: 61.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter estimated wind of 70 MPH.

Thunderstorm Wind in WRIGHT, IOWA
From 18-JUL-10 00:28:00 to 18-JUL-10 00:28:00 (CST-6)
Location: EAGLE GROVE
Magnitude: 50.00 MG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in HAMILTON, IOWA
From 18-JUL-10 01:00:00 to 18-JUL-10 01:00:00 (CST-6)
Location: WEBSTER CITY ARPT
Magnitude: 52.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Numerous small tree branches blown down.

Thunderstorm Wind in BOONE, IOWA
From 18-JUL-10 01:05:00 to 18-JUL-10 01:05:00 (CST-6)
Location: BOXHOLM
Magnitude: 52.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Half inch size hail reported with 60 MPH winds in Boxholm.

Heavy Rain in WEBSTER, IOWA
From 18-JUL-10 00:00:00 to 18-JUL-10 01:00:00 (CST-6)
Location: FT DODGE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Rainfall of 1.7 inches in the hour between 0000 and 0100 CST.

Heavy Rain in MARION, IOWA
From 18-JUL-10 03:43:00 to 18-JUL-10 03:43:00 (CST-6)
Location: KNOXVILLE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Some areas of Knoxville reported street flooding.

Thunderstorm Wind in BOONE, IOWA
From 18-JUL-10 01:23:00 to 18-JUL-10 01:23:00 (CST-6)
Location: BOONE
Magnitude: 56.00 MG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: AWOS

Thunderstorm Wind in BOONE, IOWA
From 18-JUL-10 01:28:00 to 18-JUL-10 01:28:00 (CST-6)
Location: ERICSON
Magnitude: 63.00 MG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in STORY, IOWA
From 18-JUL-10 01:38:00 to 18-JUL-10 01:38:00 (CST-6)
Location: AMES
Magnitude: 62.00 MG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: ASOS

Thunderstorm Wind in STORY, IOWA
From 18-JUL-10 01:40:00 to 18-JUL-10 01:40:00 (CST-6)
Location: AMES
Magnitude: 52.00 MG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in POLK, IOWA
From 18-JUL-10 01:57:00 to 18-JUL-10 01:57:00 (CST-6)
Location: HERROLD
Magnitude: 57.00 MG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

NWS office in Johnston.

Thunderstorm Wind in POLK, IOWA
From 18-JUL-10 02:00:00 to 18-JUL-10 02:00:00 (CST-6)
Location: LOVINGTON
Magnitude: 73.00 MG
Property damage: 200.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Measured gust with several trees down.

Thunderstorm Wind in DALLAS, IOWA
From 18-JUL-10 02:08:00 to 18-JUL-10 02:08:00 (CST-6)
Location: HADDEN HILL
Magnitude: 61.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: NWS Employee

Also with pea size hail falling.

Thunderstorm Wind in POLK, IOWA
From 18-JUL-10 02:09:00 to 18-JUL-10 02:09:00 (CST-6)
Location: URBANDALE
Magnitude: 61.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter estimated wind gust to 70 MPH.

Thunderstorm Wind in DALLAS, IOWA
From 18-JUL-10 02:04:00 to 18-JUL-10 02:04:00 (CST-6)
Location: SHULER MINE
Magnitude: 56.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter estimated winds near 65 MPH.

Thunderstorm Wind in POLK, IOWA
From 18-JUL-10 02:05:00 to 18-JUL-10 02:05:00 (CST-6)
Location: ANKENY
Magnitude: 65.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Canopy at Caseys blown down.

Thunderstorm Wind in POLK, IOWA
From 18-JUL-10 02:14:00 to 18-JUL-10 02:14:00 (CST-6)
Location: (DSM)DES MOINES INTL
Magnitude: 52.00 MG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: ASOS

Thunderstorm Wind in BOONE, IOWA
From 18-JUL-10 01:25:00 to 18-JUL-10 01:25:00 (CST-6)
Location: BOONE MUNI ARPT
Magnitude: 52.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: NWS Employee

NWS employee estimated 60 MPH wind gust.

Thunderstorm Wind in POLK, IOWA
From 18-JUL-10 02:20:00 to 18-JUL-10 02:20:00 (CST-6)
Location: (DSM)DES MOINES INTL
Magnitude: 53.00 MG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: ASOS

Thunderstorm Wind in MADISON, IOWA
From 18-JUL-10 02:28:00 to 18-JUL-10 02:28:00 (CST-6)
Location: WINTERSET
Magnitude: 61.00 MG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in POLK, IOWA
From 18-JUL-10 02:25:00 to 18-JUL-10 02:25:00 (CST-6)
Location: BONDURANT
Magnitude: 52.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Small tree branches blown down.

Thunderstorm Wind in MADISON, IOWA
From 18-JUL-10 02:30:00 to 18-JUL-10 02:30:00 (CST-6)
Location: WINTERSET
Magnitude: 61.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees down with multiple power outages and downed transformers.

Thunderstorm Wind in DALLAS, IOWA
From 18-JUL-10 02:26:00 to 18-JUL-10 02:26:00 (CST-6)
Location: HADDEN HILL
Magnitude: 57.00 EG
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Large trees down in Waukee and Woodward.  Power out across half of Waukee.

Thunderstorm Wind in POLK, IOWA
From 18-JUL-10 01:50:00 to 18-JUL-10 01:50:00 (CST-6)
Location: DODGE FLD ARPT
Magnitude: 61.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: NWS Employee

Beaver Drive closed by Camp Dodge as crews remove fallen tree across road.

Thunderstorm Wind in APPANOOSE, IOWA
From 18-JUL-10 03:54:00 to 18-JUL-10 03:54:00 (CST-6)
Location: RATHBUN
Magnitude: 52.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Very heavy rain and tree damage reported.

Flash Flood in MARION, IOWA
From 18-JUL-10 04:50:00 to 18-JUL-10 08:30:00 (CST-6)
Location: KNOXVILLE
Flood cause: Heavy Rain
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Four feet of water in some city streets.  Cars were stalled.

Thunderstorm Wind in STORY, IOWA
From 18-JUL-10 01:43:00 to 18-JUL-10 01:43:00 (CST-6)
Location: AMES
Magnitude: 58.00 MG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in POLK, IOWA
From 18-JUL-10 02:00:00 to 18-JUL-10 02:00:00 (CST-6)
Location: LOVINGTON
Magnitude: 65.00 EG
Property damage: 150.00K
Crop damage: 0.00K
Reported by: NWS Employee

Telephone pole snapped near the top.  Power in the area reportedly out.

Thunderstorm Wind in STORY, IOWA
From 18-JUL-10 01:30:00 to 18-JUL-10 01:30:00 (CST-6)
Location: AMES
Magnitude: 61.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Tree damage reported and power pole snapped.

Thunderstorm Wind in WEBSTER, IOWA
From 18-JUL-10 01:00:00 to 18-JUL-10 01:00:00 (CST-6)
Location: GOWRIE
Magnitude: 53.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Large branches were blown down by the wind.

Thunderstorm Wind in POLK, IOWA
From 18-JUL-10 02:01:00 to 18-JUL-10 02:01:00 (CST-6)
Location: GRIMES
Magnitude: 69.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Widespread tree damage in the area caused by 75 to 85 MPH winds.

Heavy Rain in STORY, IOWA
From 18-JUL-10 01:00:00 to 18-JUL-10 08:43:00 (CST-6)
Location: SLATER
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Story County Emergency Manager reported 3.25 inches of rain from last nights storm.

Flash Flood in HAMILTON, IOWA
From 18-JUL-10 01:15:00 to 18-JUL-10 05:00:00 (CST-6)
Location: WEBSTER CITY
Flood cause: Heavy Rain
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Local law enforcement reports manhole covers blown off and streets flooded in Webster City.  At least 2 cars that attempted to drive through the water were flooded and stalled.

Hail in PALO ALTO, IOWA
From 17-JUL-10 22:25:00 to 17-JUL-10 22:25:00 (CST-6)
Location: GRAETTINGER
Magnitude: 1.75 
Property damage: 5.00K
Crop damage: 15.00K
Reported by: Trained Spotter

Thunderstorm Wind in BOONE, IOWA
From 18-JUL-10 01:23:00 to 18-JUL-10 01:23:00 (CST-6)
Location: BOONE
Magnitude: 61.00 EG
Property damage: 75.00K
Crop damage: 0.00K
Reported by: NWS Employee

Numerous branches down across the city of Boone.  Largest was at least 18 inches in diameter.

Thunderstorm Wind in APPANOOSE, IOWA
From 18-JUL-10 03:48:00 to 18-JUL-10 03:48:00 (CST-6)
Location: MORAVIA
Magnitude: 65.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A barn was destroyed by high winds.

Thunderstorm Wind in LUCAS, IOWA
From 18-JUL-10 03:07:00 to 18-JUL-10 03:07:00 (CST-6)
Location: CHARITON
Magnitude: 61.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A tree 12 inches in diameter was blown over by strong winds.

Thunderstorm Wind in MARION, IOWA
From 18-JUL-10 02:40:00 to 18-JUL-10 02:40:00 (CST-6)
Location: PLEASANTVILLE
Magnitude: 61.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Power lines reported down from strong winds.

Thunderstorm Wind in WARREN, IOWA
From 18-JUL-10 02:26:00 to 18-JUL-10 02:26:00 (CST-6)
Location: INDIANOLA
Magnitude: 61.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees reported down on east Euclid Ave.

Thunderstorm Wind in MADISON, IOWA
From 18-JUL-10 02:21:00 to 18-JUL-10 02:21:00 (CST-6)
Location: WINTERSET
Magnitude: 69.00 EG
Property damage: 25.00K
Crop damage: 10.00K
Reported by: Law Enforcement

A roof was blown off of a camper.  Tree limbs 12 to 24 inches in diameter were broken.  Power lines were also downed.

Thunderstorm Wind in DALLAS, IOWA
From 18-JUL-10 02:08:00 to 18-JUL-10 02:08:00 (CST-6)
Location: ADEL
Magnitude: 65.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Large tree limbs blown onto nearby roads.  Some trees were uprooted.

Thunderstorm Wind in POCAHONTAS, IOWA
From 17-JUL-10 23:20:00 to 17-JUL-10 23:20:00 (CST-6)
Location: HAVELOCK
Magnitude: 61.00 EG
Property damage: 25.00K
Crop damage: 50.00K
Reported by: Trained Spotter

Barn doors were blown off.  Also crop damage was reported.

Thunderstorm Wind in HUMBOLDT, IOWA
From 17-JUL-10 23:40:00 to 17-JUL-10 23:40:00 (CST-6)
Location: DAKOTA CITY
Magnitude: 65.00 EG
Property damage: 200.00K
Crop damage: 100.00K
Reported by: Law Enforcement

Local law enforcement reports large limbs down across Humboldt County as well as large trees broken and uprooted near the county fairgrounds.

Thunderstorm Wind in WEBSTER, IOWA
From 18-JUL-10 00:45:00 to 18-JUL-10 00:45:00 (CST-6)
Location: PALM GROVE
Magnitude: 65.00 EG
Property damage: 50.00K
Crop damage: 10.00K
Reported by: Law Enforcement

Local law enforcement reports a grain bin blown over on 320th St near Palm Grove.

Thunderstorm Wind in HAMILTON, IOWA
From 18-JUL-10 00:45:00 to 18-JUL-10 00:45:00 (CST-6)
Location: WEBSTER CITY
Magnitude: 65.00 EG
Property damage: 250.00K
Crop damage: 100.00K
Reported by: Law Enforcement

Local law enforcement reports trees and power lines down at several locations around Hamilton County with the bulk of the damage in the Webster City and Kamrar areas.  Widespread power outages after the storm had only been partly restored by morning.

Thunderstorm Wind in PALO ALTO, IOWA
From 17-JUL-10 22:40:00 to 17-JUL-10 22:40:00 (CST-6)
Location: EMMETSBURG
Magnitude: 61.00 EG
Property damage: 10.00K
Crop damage: 10.00K
Reported by: Trained Spotter

Numerous trees down, some uprooted.

Thunderstorm Wind in BOONE, IOWA
From 18-JUL-10 01:40:00 to 18-JUL-10 01:40:00 (CST-6)
Location: MADRID
Magnitude: 51.00 MG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Several large trees greater than 12 inches in diameter felled.  Large tree branches of 6 inches or greater also broken.

Thunderstorm Wind in STORY, IOWA
From 18-JUL-10 02:10:00 to 18-JUL-10 02:10:00 (CST-6)
Location: NEVADA
Magnitude: 61.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Numerous large trees and limbs down in town.

Lightning in BLACK HAWK, IOWA
From 18-JUL-10 02:50:00 to 18-JUL-10 02:50:00 (CST-6)
Location: RAYMOND
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Newspaper

Thunderstorm Wind in KOSSUTH, IOWA
From 17-JUL-10 23:10:00 to 17-JUL-10 23:10:00 (CST-6)
Location: WHITTEMORE
Magnitude: 52.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Newspaper

Strong winds downed several trees in the Whittemore area.

Hail in PALO ALTO, IOWA
From 17-JUL-10 22:25:00 to 17-JUL-10 22:25:00 (CST-6)
Location: GRAETTINGER
Magnitude: 1.25 
Property damage: 5.00K
Crop damage: 200.00K
Reported by: Public

Crop damage included bean plant heights being cut in half and leaves stripped from corn.

Heavy Rain in POLK, IOWA
From 18-JUL-10 01:00:00 to 18-JUL-10 02:00:00 (CST-6)
Location: POLK CITY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Rainfall of 2.36 inches fell in one hour between 0100 and 0200 CST.

Flash Flood in MARION, IOWA
From 18-JUL-10 04:50:00 to 18-JUL-10 08:30:00 (CST-6)
Location: COLUMBIA
Flood cause: Heavy Rain
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Water was reported over 103rd Ave into Columbia near Highway 14.

Thunderstorm Wind in HUMBOLDT, IOWA
From 18-JUL-10 00:00:00 to 18-JUL-10 00:00:00 (CST-6)
Location: DAKOTA CITY
Magnitude: 65.00 EG
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Humboldt County sheriff reported 70 to 80 MPH winds in town.

Thunderstorm Wind in WEBSTER, IOWA
From 18-JUL-10 00:21:00 to 18-JUL-10 00:21:00 (CST-6)
Location: BADGER
Magnitude: 56.00 EG
Property damage: 50.00K
Crop damage: 10.00K
Reported by: Trained Spotter

Estimated winds of 60 to 70 MPH with 2 to 4 inch diameter tree branches down.  Visibility near zero in heavy rain.

Thunderstorm Wind in BOONE, IOWA
From 18-JUL-10 01:12:00 to 18-JUL-10 01:12:00 (CST-6)
Location: BOONE
Magnitude: 65.00 EG
Property damage: 200.00K
Crop damage: 50.00K
Reported by: Law Enforcement

Local law enforcement reports trees and power lines down in Boone and across the county with some roads closed due to debris.

Thunderstorm Wind in BOONE, IOWA
From 18-JUL-10 01:27:00 to 18-JUL-10 01:27:00 (CST-6)
Location: MADRID
Magnitude: 61.00 EG
Property damage: 100.00K
Crop damage: 50.00K
Reported by: Law Enforcement

Local law enforcement reports power lines and trees down across the county.  Some roads blocked by debris and a house struck by a tree on 320th about 2 miles northeast of Madrid.

Thunderstorm Wind in STORY, IOWA
From 18-JUL-10 01:40:00 to 18-JUL-10 01:40:00 (CST-6)
Location: NEVADA MUNI ARPT
Magnitude: 61.00 EG
Property damage: 50.00K
Crop damage: 100.00K
Reported by: Emergency Manager

Story County Emergency Manager reports trees destroyed including a 100 year old oak, corn shredded, and power lines down 3 miles west of Nevada.

Thunderstorm Wind in POLK, IOWA
From 18-JUL-10 01:46:00 to 18-JUL-10 01:46:00 (CST-6)
Location: ANKENY
Magnitude: 56.00 EG
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Estimated 60 to 70 MPH winds on the north side of Ankeny.

Thunderstorm Wind in STORY, IOWA
From 18-JUL-10 01:30:00 to 18-JUL-10 01:30:00 (CST-6)
Location: AMES
Magnitude: 65.00 EG
Property damage: 500.00K
Crop damage: 100.00K
Reported by: Emergency Manager

Story County Emergency Manager reports widespread significant tree damage in and around Ames.  Some trees uprooted and others snapped off.  Empty grain bins and outbuildings damaged across the county.  A tree fell on a shed at Iowa State University.

Thunderstorm Wind in POLK, IOWA
From 18-JUL-10 01:55:00 to 18-JUL-10 01:55:00 (CST-6)
Location: WINDSOR HGTS
Magnitude: 65.00 EG
Property damage: 75.00K
Crop damage: 0.00K
Reported by: Public

Citizen reports numerous large trees down on 74th St in Windsor Heights.  A 3 to 4 foot diameter White Pine was snapped at the base and another tree fell onto a garage and through a roof.

Thunderstorm Wind in STORY, IOWA
From 18-JUL-10 02:00:00 to 18-JUL-10 02:00:00 (CST-6)
Location: GILBERT
Magnitude: 57.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Tree damage reported and yard tables moved.

Thunderstorm Wind in POLK, IOWA
From 18-JUL-10 02:05:00 to 18-JUL-10 02:05:00 (CST-6)
Location: ANKENY
Magnitude: 61.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Numerous 4 to 6 inch diameter tree limbs down by the high winds.

Thunderstorm Wind in WARREN, IOWA
From 18-JUL-10 02:15:00 to 18-JUL-10 02:15:00 (CST-6)
Location: CLARKSON
Magnitude: 61.00 EG
Property damage: 25.00K
Crop damage: 15.00K
Reported by: Trained Spotter

Former NWS employee reports numerous trees, some as large as 4 feet around, snapped off near John Goodhue Road in Carlisle.

Thunderstorm Wind in APPANOOSE, IOWA
From 18-JUL-10 03:55:00 to 18-JUL-10 03:55:00 (CST-6)
Location: MYSTIC
Magnitude: 61.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Winds reported near 70 MPH and pea size hail.

Thunderstorm Wind in APPANOOSE, IOWA
From 18-JUL-10 04:00:00 to 18-JUL-10 04:00:00 (CST-6)
Location: CLARKDALE
Magnitude: 63.00 MG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gust reported by a Ham Radio operator.