A squall line developed in a semi-moist atmosphere ahead of a cold front in Iowa.  Sections of the squall line bowed out as it passed through Eastern Iowa and far Northwest Illinois.  Isolated storms developed ahead of the squall line in Illinois producing localized damage due to downbursts across Putnam County.  Due to the time of day, the atmosphere was not unstable enough to allow the production of widespread severe winds. Numerous private wind recording instruments reported measured winds of 42 to 49 knots (48 to 56 mph) with the passage of the squall line.

Thunderstorm Wind in HENRY, IOWA
From 29-OCT-04 20:09:00 to 29-OCT-04 20:35:00 (CST)
Location: COUNTYWIDE
Magnitude: 78 EG
Property damage: 450K
Reported by: NWS STORM SURVEY

Main axis of damage is a less than a mile wide path running from 1.3 miles NNW of Rome (near the intersection of White Oak Rd and 208th Street) to 3.2 miles E of Winfield on 120th Street. Between 4 miles Northwest of Mount Pleasant to 2 miles NNE of Mount Pleasant, the damage path widened to 4 miles.  Numerous trees and powerlines were downed with severe damage to an ANR pipeline pumping station located northwest of Mount Pleasant.  Three homes suffered significant damage...including one which was blown off its foundation while another lost its roof.  Numerous outbuildings and sheds were destroyed with grain wagons overturned.  The Winfield cemetary (located southeast of town) had its entire 240 foot perimeter fence knocked down with several gravestones damaged.  KDVN 88D velocity data suggests severe winds in Jefferson and Louisa Counties from this bow echo, but survey results indicate no damage indicative of severe winds.

Hail in BENTON, IOWA
From 29-OCT-04 18:37:00 to 29-OCT-04 18:41:00 (CST)
Location: VAN HORNE
Magnitude: 1.00 
Property damage: 3K
Reported by: FIRE DEPT/RESCUE SQUAD

Thunderstorm Wind in WASHINGTON, IOWA
From 29-OCT-04 19:38:00 to 29-OCT-04 19:47:00 (CST)
Location: WASHINGTON
Magnitude: 51 MG
Property damage: 1K
Reported by: LAW ENFORCEMENT

Measured at Sheriff Department.  KAWG AWOS about 2 miles southeast recorded a gust of 49 knots from 1940-1950 CST.

Thunderstorm Wind in JOHNSON, IOWA
From 29-OCT-04 19:54:00 to 29-OCT-04 19:57:00 (CST)
Location: IOWA CITY
Magnitude: 52 EG
Property damage: 4K
Reported by: LAW ENFORCEMENT

Trees and power lines down on Sand Road. KIOW ASOS to the west and north of this location recorded a 40 knot (46 mph) wind gust at 1956 CST.  KDVN 88D velocity data indicated the strongest winds passed to the south and east of KIOW.

Thunderstorm Wind in JOHNSON, IOWA
From 29-OCT-04 19:57:00 to 29-OCT-04 20:00:00 (CST)
Location: IOWA CITY
Magnitude: 52 EG
Property damage: 2K
Reported by: LAW ENFORCEMENT

Trees down along American Legion Road near the intersection of 400th Street.

Thunderstorm Wind in DES MOINES, IOWA
From 29-OCT-04 20:48:00 to 29-OCT-04 20:56:00 (CST)
Location: MEDIAPOLIS
Magnitude: 57 MG
Property damage: 1K
Reported by: TRAINED SPOTTER

8 inch diameter solid pine tree downed.

Thunderstorm Wind in CLINTON, IOWA
From 29-OCT-04 20:58:00 to 29-OCT-04 21:04:00 (CST)
Location: CHARLOTTE
Magnitude: 52 EG
Property damage: 4K
Reported by: AMATEUR RADIO

Trees and powerlines down.

Heavy Rain in DES MOINES, IOWA
From 29-OCT-04 20:48:00 to 29-OCT-04 21:23:00 (CST)
Location: MEDIAPOLIS
Magnitude: 1.1 
Reported by: TRAINED SPOTTER

1.1 inches in 35 minutes.

Thunderstorm Wind in JOHNSON, IOWA
From 29-OCT-04 20:01:00 to 29-OCT-04 20:08:00 (CST)
Location: OASIS
Magnitude: 52 EG
Crop damage: 50K
Reported by: NEWSPAPER

80 percent of the corn on the Clyde Antone Farm was leveled.

Thunderstorm Wind in JOHNSON, IOWA
From 29-OCT-04 20:05:00 to 29-OCT-04 20:10:00 (CST)
Location: MORSE
Magnitude: 52 EG
Property damage: 4K
Reported by: LAW ENFORCEMENT

Trees and power lines down on 250th Street.

Thunderstorm Wind in CEDAR, IOWA
From 29-OCT-04 20:10:00 to 29-OCT-04 20:14:00 (CST)
Location: TIPTON
Magnitude: 52 EG
Property damage: 1K
Reported by: LAW ENFORCEMENT

Tree down blocking traffic.

Thunderstorm Wind in HENRY, IOWA
From 29-OCT-04 20:30:00 to 29-OCT-04 20:38:00 (CST)
Location: MT PLEASANT MUNI ARP
Magnitude: 50 MG
Property damage: 1K
Reported by: AWOS,ASOS,MESONET,ETC

KMPZ AWOS