An upper level disturbance combined with a strong low level jet of 30 to 40 knots initiated thunderstorms in a semi-moist atmosphere across eastern Iowa and northwest Illinois.  This low level jet strengthed to 50 to 55 knots across eastern Iowa and northwest Illinois around sunset.  Favorable shear profiles allowed supercells to develop that were prolific large hail producers.  Additionally, numerous tornadoes were produced causing considerable damage.

Hail in BUREAU, ILLINOIS
From 13-APR-06 21:19:00 to 13-APR-06 21:22:00 (CST)
Location: WHITEFIELD
Magnitude: 0.88 
Reported by: TRAINED SPOTTER

Location is on the Bureau/Putnam line; pea to nickel size hail

Thunderstorm Wind in WARREN, ILLINOIS
From 13-APR-06 21:11:00 to 13-APR-06 21:18:00 (CST)
Location: ALEXIS
Magnitude: 70 EG
Property damage: 30K
Reported by: NWS STORM SURVEY

While a tornado was moving across the north part of the town (in Mercer County), downburst winds or the rear flank downdraft downed power lines and trees in the south part of the town with varying amounts of damage done to structures.

Hail in PUTNAM, ILLINOIS
From 14-APR-06 00:08:00 to 14-APR-06 00:08:00 (CST)
Location: MAGNOLIA
Magnitude: 1.75 
Property damage: 10K
Reported by: TRAINED SPOTTER

Thunderstorm Wind in MERCER, ILLINOIS
From 13-APR-06 20:50:00 to 13-APR-06 21:15:00 (CST)
Location: COUNTYWIDE
Magnitude: 70 EG
Property damage: 100K
Reported by: NEWSPAPER

Several supercell storms slowed down and transformed into high precipitation supercells across Mercer county.  Widespread reports of damage to trees and power lines were received.  Illinois Highway 17 was closed between Aledo and Joy due to the number of power lines, poles, and trees down across the road.  The road did not open until the following afternoon.  Specific locations of severe damage will be given as separate entries.

Hail in MERCER, ILLINOIS
From 13-APR-06 21:08:00 to 13-APR-06 21:15:00 (CST)
Location: NEW WINDSOR
Magnitude: 1.00 
Property damage: 5K
Reported by: TRAINED SPOTTER

Thunderstorm Wind in HENRY, ILLINOIS
From 13-APR-06 21:15:00 to 13-APR-06 21:15:00 (CST)
Location: ATKINSON
Magnitude: 70 EG
Property damage: 30K
Reported by: TRAINED SPOTTER

A grain bin was destroyed when it was tossed over a corn crib on the Steve Carton farm by a downburst or possible microburst.  Radar data indicated a bowing segment of thunderstorms and the farm was just to the right of the bow apex.

Hail in MERCER, ILLINOIS
From 13-APR-06 21:20:00 to 13-APR-06 21:20:00 (CST)
Location: NORTH HENDERSON
Magnitude: 0.75 
Reported by: TRAINED SPOTTER

dime size hail

Hail in STEPHENSON, ILLINOIS
From 13-APR-06 20:29:00 to 13-APR-06 20:29:00 (CST)
Location: FREEPORT
Magnitude: 0.75 
Reported by: TRAINED SPOTTER

Hail in MERCER, ILLINOIS
From 13-APR-06 20:55:00 to 13-APR-06 21:02:00 (CST)
Location: ALEDO
Magnitude: 1.25 
Property damage: 20K
Reported by: TRAINED SPOTTER

Window cracked with hole the size of a half dollar; pea to half dollar size hail during the storm.

Thunderstorm Wind in MERCER, ILLINOIS
From 13-APR-06 20:59:00 to 13-APR-06 21:20:00 (CST)
Location: ALEDO
Magnitude: 57 EG
Property damage: 10K
Reported by: NEWSPAPER

Trees/limbs and power lines down across the city.

Thunderstorm Wind in MERCER, ILLINOIS
From 13-APR-06 21:03:00 to 13-APR-06 21:09:00 (CST)
Location: MATHERVILLE
Magnitude: 61 EG
Property damage: 35K
Reported by: NEWSPAPER

Location is about 2.5 miles south of Reynolds on the Berenger farm.  Damage to the siding and roof of the house with damage to several outbuildings.

Hail in MERCER, ILLINOIS
From 13-APR-06 21:09:00 to 13-APR-06 21:09:00 (CST)
Location: NORTH HENDERSON
Magnitude: 0.88 
Reported by: TRAINED SPOTTER

Location is 4WNW Alexis

Thunderstorm Wind in WARREN, ILLINOIS
From 13-APR-06 21:15:00 to 13-APR-06 21:21:00 (CST)
Location: LITTLE YORK
Magnitude: 70 EG
Property damage: 70K
Reported by: NEWSPAPER

Grain bin destroyed with damage to the house and garage.

Thunderstorm Wind in HENRY, ILLINOIS
From 13-APR-06 21:35:00 to 13-APR-06 21:35:00 (CST)
Location: CAMBRIDGE
Magnitude: 52 EG
Property damage: 2K
Reported by: EMERGENCY MANAGER

EM estimated 60 mph winds

Hail in HENRY, ILLINOIS
From 13-APR-06 22:45:00 to 13-APR-06 22:45:00 (CST)
Location: GALVA
Magnitude: 0.75 
Reported by: EMERGENCY MANAGER

Hail in PUTNAM, ILLINOIS
From 13-APR-06 23:45:00 to 14-APR-06 00:08:00 (CST)
Location: COUNTYWIDE
Magnitude: 1.75 
Property damage: 15K
Reported by: GOVT OFFICIAL

Lake Thunderbird to Magnolia; radar would indicate a near continuous hail swath.  Based on the reports received from spotters, the hail likely varied from nickel to golfball size.

Hail in ROCK ISLAND, ILLINOIS
From 13-APR-06 20:44:00 to 13-APR-06 20:44:00 (CST)
Location: ILLINOIS CITY
Magnitude: 1.00 
Property damage: 5K
Reported by: TRAINED SPOTTER

quarter size hail covering the ground to a depth of 2-3 inches.

Hail in ROCK ISLAND, ILLINOIS
From 13-APR-06 20:46:00 to 13-APR-06 20:46:00 (CST)
Location: ANDALUSIA
Magnitude: 1.00 
Property damage: 5K
Reported by: TRAINED SPOTTER

Hail in ROCK ISLAND, ILLINOIS
From 13-APR-06 20:46:00 to 13-APR-06 20:46:00 (CST)
Location: ILLINOIS CITY
Magnitude: 1.75 
Property damage: 10K
Reported by: TRAINED SPOTTER

Muscatine spotter relayed report

Hail in WARREN, ILLINOIS
From 13-APR-06 21:17:00 to 13-APR-06 21:21:00 (CST)
Location: ALEXIS
Magnitude: 0.75 
Reported by: TRAINED SPOTTER

Hail in PUTNAM, ILLINOIS
From 13-APR-06 21:19:00 to 13-APR-06 21:22:00 (CST)
Location: PUTNAM
Magnitude: 0.88 
Reported by: TRAINED SPOTTER

Location is 3SSW of Lake Thunderbird on the Putnam/Bureau line; pea to nickel size hail

Hail in HENRY, ILLINOIS
From 13-APR-06 21:35:00 to 13-APR-06 21:35:00 (CST)
Location: CAMBRIDGE
Magnitude: 0.88 
Reported by: TRAINED SPOTTER

Hail in PUTNAM, ILLINOIS
From 13-APR-06 23:45:00 to 13-APR-06 23:45:00 (CST)
Location: PUTNAM
Magnitude: 1.75 
Property damage: 10K
Reported by: TRAINED SPOTTER

Heavy Rain in WHITESIDE, ILLINOIS
From 13-APR-06 19:47:00 to 13-APR-06 20:00:00 (CST)
Location: STERLING
Reported by: GENERAL PUBLIC

1.05 inches of rain

Hail in WHITESIDE, ILLINOIS
From 13-APR-06 19:57:00 to 13-APR-06 19:57:00 (CST)
Location: STERLING
Magnitude: 0.75 
Reported by: TRAINED SPOTTER

pea to penny size hail

Hail in PUTNAM, ILLINOIS
From 13-APR-06 21:03:00 to 13-APR-06 21:03:00 (CST)
Location: PUTNAM
Magnitude: 0.88 
Reported by: TRAINED SPOTTER

dime to nickel size hail with heavy rain

Hail in BUREAU, ILLINOIS
From 13-APR-06 20:51:00 to 13-APR-06 20:51:00 (CST)
Location: PRINCETON
Magnitude: 0.75 
Reported by: TRAINED SPOTTER

dime size hail

Thunderstorm Wind in MERCER, ILLINOIS
From 13-APR-06 20:50:00 to 13-APR-06 20:57:00 (CST)
Location: JOY
Magnitude: 78 EG
Property damage: 250K
Reported by: NEWSPAPER

Numerous trees and power lines were downed in Joy.  Westmer High School had considerable roof damage done to the gymnasium.  The outer roof of the Frontier Communications Building was peeled off.  A mobile home just north of Joy was destroyed.

Thunderstorm Wind in MERCER, ILLINOIS
From 13-APR-06 20:51:00 to 13-APR-06 20:57:00 (CST)
Location: MILLERSBURG
Magnitude: 65 EG
Property damage: 50K
Reported by: NEWSPAPER

Roof off a barn with damage to the siding.  Paint was stripped from the house with damage done to the garage.

Hail in MERCER, ILLINOIS
From 13-APR-06 20:55:00 to 13-APR-06 20:58:00 (CST)
Location: VIOLA
Magnitude: 1.00 
Property damage: 5K
Reported by: TRAINED SPOTTER