A seasonally strong low pressure system lifted northeast from northern Kansas to extreme western Iowa, on March 31, 2007. A warm front moved northward into northeast Iowa followed by a cold front sweeping across eastern Iowa into Illinois. These frontal boundaries triggered thunderstorms, and with sufficient low level wind shear, allowed for many to rotate. Most of the thunderstorms produced large hail and damaging wind. However, one storm in particular that crossed over the warm front, produced an EF1 tornado in Delaware county, in northeast Iowa, at about 429 pm CST. The tornado tracked NNE for a total of about 10 miles (part of this track was in Clayton county) and was 200 yards wide, striking eight farmsteads in Delaware county. No one was killed or injured, however 24 cows were killed when a dairy barn collapsed.

Hail in KEOKUK, IOWA
From 31-MAR-07 13:50:00 to 31-MAR-07 13:55:00 (CST-6)
Location: HEDRICK
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Nickel size hail fell for 5 minutes.

Hail in BUCHANAN, IOWA
From 31-MAR-07 14:11:00 to 31-MAR-07 14:11:00 (CST-6)
Location: BRANDON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Spotter reported nickel to quarter size hail.

Thunderstorm Wind in BENTON, IOWA
From 31-MAR-07 15:15:00 to 31-MAR-07 15:15:00 (CST-6)
Location: KEYSTONE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Spotter estimated wind gusts to 60 mph.

Tornado in DELAWARE, IOWA
From 31-MAR-07 16:29:00 to 31-MAR-07 16:37:00 (CST-6)
Location: DELAWARE
Tornado F-scale: EF1
Property damage: 162.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

This tornado began 5.4 miles north of Delaware, in Delaware county, at about 429 pm CST, and crossed into Clayton county 6 miles east of Edgewood at approximately 437 pm CST. The tornado was rated EF1 (NWS storm survey team), moved north-northeast at 50 mph, and had a total path length of 10 miles and was 200 yards wide. The tornado struck eight farmsteads in Delaware county, producing mostly minor damage to outbuildings and trees. However, at a farm southeast of Greeley, EF1 damage occurred with winds estimated at 81 mph. A dairy barn collapsed, trapping two people that were milking cows under the debris. They were rescued unharmed, but 24 cows were killed. A two-car garage was completely blown off its foundation, but the house next to it had little damage. An eyewitness just southwest of this farmstead reported seeing rotation in the clouds as it descended and struck the dairy barn. Near the Delaware-Clayton county line, a narrow swath of considerable tree damage was noted, with debris carried up a hillside and spread across a road. Path length in Delaware county was more than 7 miles, and damage was estimated at $162,000.

Hail in BENTON, IOWA
From 31-MAR-07 15:15:00 to 31-MAR-07 15:15:00 (CST-6)
Location: KEYSTONE
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Penny size hail reported.

Hail in WASHINGTON, IOWA
From 31-MAR-07 15:22:00 to 31-MAR-07 15:22:00 (CST-6)
Location: AINSWORTH
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail measured the size of quarters.

Thunderstorm Wind in BENTON, IOWA
From 31-MAR-07 15:14:00 to 31-MAR-07 15:14:00 (CST-6)
Location: GARRISON
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Barn blown down.

Thunderstorm Wind in BUCHANAN, IOWA
From 31-MAR-07 15:45:00 to 31-MAR-07 15:45:00 (CST-6)
Location: JESUP
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Fire department reported large barn damaged by straight line winds near Jesup.

Thunderstorm Wind in BUCHANAN, IOWA
From 31-MAR-07 15:50:00 to 31-MAR-07 15:50:00 (CST-6)
Location: FAIRBANK
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Large tree blown down across a highway.

Thunderstorm Wind in CLINTON, IOWA
From 31-MAR-07 17:12:00 to 31-MAR-07 17:12:00 (CST-6)
Location: DEWITT
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

NWS employee in Dewitt estimated wind gusts to 60 mph.

Hail in KEOKUK, IOWA
From 31-MAR-07 14:15:00 to 31-MAR-07 14:15:00 (CST-6)
Location: SIGOURNEY
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Spotter at Sigourney reported penny size hail.

Thunderstorm Wind in IOWA, IOWA
From 31-MAR-07 14:49:00 to 31-MAR-07 14:49:00 (CST-6)
Location: MARENGO
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Spotter reported estimated 50 to 60 mph gusts.

Thunderstorm Wind in DES MOINES, IOWA
From 31-MAR-07 16:30:00 to 31-MAR-07 16:30:00 (CST-6)
Location: LENOX PARK
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported about 12 power lines and 12 trees blown down.

Thunderstorm Wind in KEOKUK, IOWA
From 31-MAR-07 14:14:00 to 31-MAR-07 14:14:00 (CST-6)
Location: SIGOURNEY
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Mesonet measured 60 mph wind gust.

Thunderstorm Wind in BENTON, IOWA
From 31-MAR-07 15:10:00 to 31-MAR-07 15:10:00 (CST-6)
Location: NEWHALL
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A spotter reported winds estimated at 60 to 65 mph along Highway 30, just south of Newhall. A semi truck was also blown over.

Thunderstorm Wind in BENTON, IOWA
From 31-MAR-07 15:16:00 to 31-MAR-07 15:16:00 (CST-6)
Location: GARRISON
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Wind gusts to 50 to 60 mph.

Thunderstorm Wind in KEOKUK, IOWA
From 31-MAR-07 14:15:00 to 31-MAR-07 14:15:00 (CST-6)
Location: SIGOURNEY
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Spotter estimated 55 to 60 mph wind gusts.

Thunderstorm Wind in DES MOINES, IOWA
From 31-MAR-07 16:05:00 to 31-MAR-07 16:05:00 (CST-6)
Location: BURLINGTON
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A spotter measured wind gusts to 60 mph.

Hail in IOWA, IOWA
From 31-MAR-07 14:35:00 to 31-MAR-07 14:35:00 (CST-6)
Location: MILLERSBURG
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Sheriffs department relayed report of quarter size hail.

Hail in IOWA, IOWA
From 31-MAR-07 14:45:00 to 31-MAR-07 14:45:00 (CST-6)
Location: LADORA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Spotter estimated hail the size of quarters.

Hail in IOWA, IOWA
From 31-MAR-07 14:49:00 to 31-MAR-07 14:49:00 (CST-6)
Location: MARENGO
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A spotter reported hail the size of nickels.

Hail in SCOTT, IOWA
From 31-MAR-07 17:12:00 to 31-MAR-07 17:12:00 (CST-6)
Location: DAVENPORT
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A spotter reported nickel size hail at the intersection of I280 and Kimberly Road in Davenport.

Thunderstorm Wind in IOWA, IOWA
From 31-MAR-07 14:43:00 to 31-MAR-07 14:43:00 (CST-6)
Location: VICTOR
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported a semi truck blown over on I80 at mile marker 205.

Hail in BUCHANAN, IOWA
From 31-MAR-07 14:50:00 to 31-MAR-07 14:50:00 (CST-6)
Location: BRANDON
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A spotter reported penny size hail.

Hail in LINN, IOWA
From 31-MAR-07 15:41:00 to 31-MAR-07 15:41:00 (CST-6)
Location: CEDAR RAPIDS
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Spotter measured hail the size of pennies to nickels.

Hail in JOHNSON, IOWA
From 31-MAR-07 15:45:00 to 31-MAR-07 15:45:00 (CST-6)
Location: IOWA CITY
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Spotter reported pea to penny size hail in downtown Iowa City.

Hail in LINN, IOWA
From 31-MAR-07 16:10:00 to 31-MAR-07 16:10:00 (CST-6)
Location: MT VERNON
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement measured hail the size of pennies.

Thunderstorm Wind in HENRY, IOWA
From 31-MAR-07 15:05:00 to 31-MAR-07 15:05:00 (CST-6)
Location: OAKLAND MILLS
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported a roof blown off a barn.

Hail in BENTON, IOWA
From 31-MAR-07 14:58:00 to 31-MAR-07 14:58:00 (CST-6)
Location: BLAIRSTOWN
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Penny size hail was reported.

Hail in BENTON, IOWA
From 31-MAR-07 15:03:00 to 31-MAR-07 15:03:00 (CST-6)
Location: LUZERNE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A spotter reported quarter size hail.

Hail in DELAWARE, IOWA
From 31-MAR-07 16:29:00 to 31-MAR-07 16:29:00 (CST-6)
Location: EARLVILLE
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Spotter measured hail the size of nickels in Earlville.

Hail in WASHINGTON, IOWA
From 31-MAR-07 15:10:00 to 31-MAR-07 15:10:00 (CST-6)
Location: WASHINGTON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Spotter estimated hail the size of quarters.

Hail in DELAWARE, IOWA
From 31-MAR-07 16:29:00 to 31-MAR-07 16:29:00 (CST-6)
Location: EARLVILLE
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A spotter reported hail the size of nickels 1W Earlville.

Hail in DUBUQUE, IOWA
From 31-MAR-07 16:58:00 to 31-MAR-07 16:58:00 (CST-6)
Location: EPWORTH
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency manager measured hail the size of quarters.