The instability and overall weather situation remained similar to what it was the previous evening.  Lifted indices were around -7 C, with downdraft CAPE values around 1000 J/kg.  Overall CAPE was in the 2000 to 4000 J/kg range.  Precipitable water values were around 1.75 inches with a deep warm cloud depth.  Freezing levels were in the 14,500 to 15,000 foot range.  A new round of thunderstorms moved into northwest Iowa on the heels of the overnight convection.  These storms were the last in a series of waves of mesoscale convective complexes that rolled across Iowa, and was 4th in the series.  As the storms turned southeast they produced high winds through portions of central Iowa.  Several reports of winds in the 60 to 65 MPH range were received in Story and Polk Counties.  Numerous trees were downed by the winds.  Three modular homes and 3 mobile homes were destroyed on a sale lot in Story County at Nevada.  Thunderstorms also dropped southeast over the northeast part of Iowa.

Thunderstorm Wind in POLK, IOWA
From 10-JUL-09 08:20:00 to 10-JUL-09 08:20:00 (CST-6)
Location: ANKENY
Magnitude: 52.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Trained Spotter

One to three inch diameter tree branches were down.

Thunderstorm Wind in STORY, IOWA
From 10-JUL-09 08:15:00 to 10-JUL-09 08:15:00 (CST-6)
Location: AMES ARPT
Magnitude: 52.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Four inch diameter tree branch fell down on a house causing roof damage.

Thunderstorm Wind in STORY, IOWA
From 10-JUL-09 08:15:00 to 10-JUL-09 08:15:00 (CST-6)
Location: AMES
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

An 8 inch diameter tree fell on a vehicle causing damage.

Thunderstorm Wind in STORY, IOWA
From 10-JUL-09 08:12:00 to 10-JUL-09 08:12:00 (CST-6)
Location: GILBERT
Magnitude: 52.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail one half inch in diameter in addition to the wind.

Thunderstorm Wind in STORY, IOWA
From 10-JUL-09 08:15:00 to 10-JUL-09 08:15:00 (CST-6)
Location: AMES
Magnitude: 52.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trees up to 2 feet in diameter fell down on a fence.

Thunderstorm Wind in STORY, IOWA
From 10-JUL-09 08:12:00 to 10-JUL-09 08:12:00 (CST-6)
Location: AMES
Magnitude: 57.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Three foot diameter Cottonwood tree toppled with other trees taken down with it.  Tree was in good condition.

Thunderstorm Wind in STORY, IOWA
From 10-JUL-09 08:03:00 to 10-JUL-09 08:03:00 (CST-6)
Location: STORY CITY
Magnitude: 52.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Emergency Manager

One foot diameter tree limbs were down, and the storm took out power lines leaving northwest Story City without power.

Thunderstorm Wind in STORY, IOWA
From 10-JUL-09 08:11:00 to 10-JUL-09 08:11:00 (CST-6)
Location: AMES
Magnitude: 56.00 MG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in STORY, IOWA
From 10-JUL-09 08:11:00 to 10-JUL-09 08:11:00 (CST-6)
Location: AMES ARPT
Magnitude: 55.00 MG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: ASOS

Thunderstorm Wind in STORY, IOWA
From 10-JUL-09 08:15:00 to 10-JUL-09 08:15:00 (CST-6)
Location: MC CALLSBURG
Magnitude: 52.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in STORY, IOWA
From 10-JUL-09 08:06:00 to 10-JUL-09 08:06:00 (CST-6)
Location: ONTARIO
Magnitude: 52.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in STORY, IOWA
From 10-JUL-09 08:20:00 to 10-JUL-09 08:20:00 (CST-6)
Location: CAMBRIDGE
Magnitude: 50.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Story County EM reported tree damage with trees up to 1 foot in diameter down in Cambridge.

Thunderstorm Wind in STORY, IOWA
From 10-JUL-09 08:25:00 to 10-JUL-09 08:25:00 (CST-6)
Location: NEVADA
Magnitude: 57.00 EG
Property damage: 300.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Three modular homes and three mobile homes on a sale lot were destroyed.