During the day, south winds drew moisture north into the state as a warm front lifted north across the area.  By evening, low pressure lifted north along a cold front to the west of the state.  The cold front advanced into the state during the evening.  Convection was limited during the afternoon due to a mid level cap and considerable low level cloudiness.  Still, the atmosphere became quite unstable by the evening hours.  Surface temperatures rose to the mid 60s to mid 70s across the CWA with dew points rising into the upper 50s to low 60s.  Effective shear was in the 30 to 45 kt range with most unstable CAPE values in the 1000 to 2000 J/kg range.  Lifted indices fell to the -3 to -6 C. range by evening.  As was the case during the morning, freezing levels were in the 11,000 to 12,000 foot range.  CAPE in the -10 to -30 C. layer was around 200 J/kg.  Thunderstorms developed just ahead of the cold front on the west edge of the mid level cap before sunset.  The storms took on a linear configuration as the moved into the state.  There were two stronger areas along the line.  The first was across the northern part of the state, the second along the southern two tiers of counties.  Most of the storms produced hail with most reports around an inch in diameter or less.  The southern part of the line took on more of a bow echo appearance and began to produce high winds.  Wind gusts to near 60 MPH in Bedford in Taylor County, and in the 50 to 60 MPH range northwest of Lamoni in Decatur County.  One tornado touched down in Wayne County.  The tornado had an intermittent track, touching down southwest of the town of Sewal and dissipating about a mile northeast of town.  Damage was done to buildings on the south side of the town.  The tornado was rated an EF0, with winds of 80-85 MPH.  The tornado broke apart east of Sewal with a band of downburst winds of up to 80 MPH extending across the county line into Appanoose County.

Hail in KOSSUTH, IOWA
From 21-MAR-07 18:10:00 to 21-MAR-07 18:10:00 (CST-6)
Location: FENTON
Magnitude: 1.00 
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Hail in TAYLOR, IOWA
From 21-MAR-07 21:10:00 to 21-MAR-07 21:10:00 (CST-6)
Location: GRAVITY
Magnitude: 1.00 
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in KOSSUTH, IOWA
From 21-MAR-07 17:37:00 to 21-MAR-07 17:37:00 (CST-6)
Location: SWEA CITY
Magnitude: 1.00 
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in APPANOOSE, IOWA
From 21-MAR-07 23:53:00 to 21-MAR-07 23:53:00 (CST-6)
Location: NUMA
Magnitude: 70.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Hail in RINGGOLD, IOWA
From 21-MAR-07 22:30:00 to 21-MAR-07 22:30:00 (CST-6)
Location: KELLERTON
Magnitude: 1.00 
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Hail in KOSSUTH, IOWA
From 21-MAR-07 20:35:00 to 21-MAR-07 20:35:00 (CST-6)
Location: ALGONA
Magnitude: 1.00 
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm Wind in WAYNE, IOWA
From 21-MAR-07 23:43:00 to 21-MAR-07 23:43:00 (CST-6)
Location: HARVARD
Magnitude: 70.00 EG
Property damage: 30.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Hail in DAVIS, IOWA
From 22-MAR-07 00:55:00 to 22-MAR-07 00:55:00 (CST-6)
Location: BLOOMFIELD
Magnitude: 1.00 
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in ADAMS, IOWA
From 21-MAR-07 21:00:00 to 21-MAR-07 21:00:00 (CST-6)
Location: CORNING
Magnitude: 0.88 
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in TAYLOR, IOWA
From 21-MAR-07 21:14:00 to 21-MAR-07 21:14:00 (CST-6)
Location: GRAVITY
Magnitude: 1.00 
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in CRAWFORD, IOWA
From 21-MAR-07 17:43:00 to 21-MAR-07 17:43:00 (CST-6)
Location: DOW CITY
Magnitude: 1.00 
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Tornado in WAYNE, IOWA
From 21-MAR-07 23:39:00 to 21-MAR-07 23:41:00 (CST-6)
Location: SEWAL
Tornado F-scale: EF0
Property damage: 150.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Tornado touched down southwest of Sewal and caused damage to building on the south side of town.  It had an intermittent track, finally lifting about a mile east of town.  The tornado was a high end EF0 tornado with winds of 80 to 85 MPH.

Thunderstorm Wind in WAYNE, IOWA
From 21-MAR-07 23:51:00 to 21-MAR-07 23:51:00 (CST-6)
Location: SEYMOUR
Magnitude: 70.00 EG
Property damage: 30.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Hail in WINNEBAGO, IOWA
From 21-MAR-07 18:56:00 to 21-MAR-07 18:56:00 (CST-6)
Location: LAKE MILLS
Magnitude: 1.00 
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in CRAWFORD, IOWA
From 21-MAR-07 17:40:00 to 21-MAR-07 17:40:00 (CST-6)
Location: DOW CITY
Magnitude: 1.00 
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MADISON, IOWA
From 21-MAR-07 23:38:00 to 21-MAR-07 23:38:00 (CST-6)
Location: EARLHAM
Magnitude: 1.00 
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in KOSSUTH, IOWA
From 21-MAR-07 20:41:00 to 21-MAR-07 20:41:00 (CST-6)
Location: ALGONA
Magnitude: 1.00 
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in TAYLOR, IOWA
From 21-MAR-07 21:12:00 to 21-MAR-07 21:12:00 (CST-6)
Location: GRAVITY
Magnitude: 1.00 
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in TAYLOR, IOWA
From 21-MAR-07 21:29:00 to 21-MAR-07 21:29:00 (CST-6)
Location: BEDFORD
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in WAYNE, IOWA
From 21-MAR-07 23:49:00 to 21-MAR-07 23:49:00 (CST-6)
Location: SEYMOUR
Magnitude: 70.00 EG
Property damage: 30.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey