A cold front frontal system located to the northwest of Iowa began to sink southeast into the state during the late afternoon of the 10th.  This was in fact the same cold front that set off the thunderstorm activity the previous night.  The atmosphere had become quite unstable by the late afternoon with temperatures in the 80s and dew point temperature in the low to mid 60s.  CAPE values were in the 2000 to 3500 J/kg range.  Thunderstorms erupted during the mid afternoon hours over the north central counties of the state.  These storms produced hail of one to one and one half inches in diameter.  The instability of the atmosphere, combined with a favorable sheer profile, contributed to the rather quick development of tornadic supercells.  The first tornado touched down in Greene County.  This tornado touched down briefly and did little damage.  As the afternoon progressed, the hail became larger with several reports of hail up to golf ball size from central Iowa east into the east central counties.  Some of the largest hail occurred southwest of State Center in Marshall County.  Baseball size hail pelted the area, causing considerable damage.  One supercell produced a family of at least four tornadoes in the Grundy County area.  It is very fortunate that the tornadoes from this storm did not hit within a populated area.  Two of the tornadoes were fairly large.  At one point, the strongest tornado was about one half mile wide based on reports from a respectable storm chaser.  This tornado tracked south through eastern Grundy County and crossed into Tama County.  One barn was destroyed by the larger tornado, with a house damaged by the second strong tornado.  Miraculously, though the first tornado totally destroyed the barn on a farm near Conrad, none of the animals inside were injured.  In fact, it was reported that the livestock appeared to be enjoying their newfound freedom as they wandered the fields at the farm.  There were reports of several small tornadoes touching down in central Iowa, however they were little more than brief touchdowns.  As the event progressed into the early evening hours, the thunderstorms too on a more multi-cellular structure.  The large cluster of storms lost their tornadic characteristic and returned to large hail producers.  Hail from three quarter inch to one and three quarter inch was common for the next several hours as the entire area moved southeast slowly.  By the mid evening hours the storms began to weaken.  As they did, a few reports of winds of 60 to 70 MPH were received.  In addition to the wind and hail, the storms produced locally heavy rainfall.  Flash flooding was also a problem with this event.  The cluster of storms that dropped the tornadoes in Grundy County during the late afternoon hours caused flash flooding in the south part of the county.  Rainfall near Conrad was between 2.5 and 5 inches in under two hours time.  This flooded roads with some of the state roads in the south part of the county under water.  The water receded fairly quickly.  A merger of cells took place over Monroe County during the mid evening hours.  This resulted in very heavy rainfall in the area with reports of up to 4 inches received.  Flash flooding resulted with numerous roads being closed by overflowing creeks by the mid to late evening hours.

Hail in JASPER, IOWA
From 10-MAY-01 18:50:00 to 10-MAY-01 18:50:00 (CST)
Location: SULLY
Magnitude: 1.25 
Property damage: 10K
Reported by: LAW ENFORCEMENT

Hail in MADISON, IOWA
From 10-MAY-01 18:56:00 to 10-MAY-01 18:56:00 (CST)
Location: WINTERSET
Magnitude: 1.00 
Property damage: 5K
Reported by: LAW ENFORCEMENT

Hail in WARREN, IOWA
From 10-MAY-01 18:58:00 to 10-MAY-01 18:58:00 (CST)
Location: INDIANOLA
Magnitude: 0.88 
Property damage: 3K
Reported by: LAW ENFORCEMENT

Hail in MADISON, IOWA
From 10-MAY-01 18:58:00 to 10-MAY-01 18:58:00 (CST)
Location: WINTERSET
Magnitude: 1.00 
Property damage: 5K
Reported by: AMATEUR RADIO

Hail in MAHASKA, IOWA
From 10-MAY-01 19:04:00 to 10-MAY-01 19:04:00 (CST)
Location: OSKALOOSA
Magnitude: 0.75 
Reported by: TRAINED SPOTTER

Hail in MADISON, IOWA
From 10-MAY-01 19:05:00 to 10-MAY-01 19:05:00 (CST)
Location: BEVINGTON
Magnitude: 0.88 
Property damage: 3K
Reported by: TRAINED SPOTTER

Hail in WARREN, IOWA
From 10-MAY-01 19:38:00 to 10-MAY-01 19:38:00 (CST)
Location: NEW VIRGINIA
Magnitude: 1.00 
Property damage: 5K
Reported by: LAW ENFORCEMENT

Hail in GRUNDY, IOWA
From 10-MAY-01 16:25:00 to 10-MAY-01 16:25:00 (CST)
Location: GRUNDY CENTER
Magnitude: 1.75 
Property damage: 10K
Reported by: BROADCAST MEDIA

Tornado in STORY, IOWA
From 10-MAY-01 16:27:00 to 10-MAY-01 16:27:00 (CST)
Location: KELLEY
Tornado F-scale: F0
Property damage: 5K
Reported by: EMERGENCY MANAGER

Brief touchdown in open area.

Tornado in BOONE, IOWA
From 10-MAY-01 16:29:00 to 10-MAY-01 16:35:00 (CST)
Location: MADRID
Tornado F-scale: F1
Property damage: 5K
Reported by: AMATEUR RADIO

Tornado tracked down during its brief life through open country.

Hail in STORY, IOWA
From 10-MAY-01 16:30:00 to 10-MAY-01 16:30:00 (CST)
Location: AMES
Magnitude: 0.75 
Reported by: TRAINED SPOTTER

Thunderstorm Wind in STORY, IOWA
From 10-MAY-01 16:30:00 to 10-MAY-01 16:30:00 (CST)
Location: AMES
Magnitude: 61 E
Property damage: 20K
Reported by: UNKNOWN

Hail in BUTLER, IOWA
From 10-MAY-01 16:34:00 to 10-MAY-01 16:34:00 (CST)
Location: NEW HARTFORD
Magnitude: 0.88 
Property damage: 4K
Reported by: TRAINED SPOTTER

Hail in BUTLER, IOWA
From 10-MAY-01 16:35:00 to 10-MAY-01 16:35:00 (CST)
Location: NEW HARTFORD
Magnitude: 1.00 
Property damage: 3K
Reported by: TRAINED SPOTTER

Thunderstorm Wind in BUTLER, IOWA
From 10-MAY-01 16:37:00 to 10-MAY-01 16:37:00 (CST)
Location: APLINGTON
Magnitude: 52 E
Property damage: 5K
Reported by: LAW ENFORCEMENT

Hail in BOONE, IOWA
From 10-MAY-01 16:37:00 to 10-MAY-01 16:37:00 (CST)
Location: BOONE
Magnitude: 1.00 
Property damage: 5K
Reported by: TRAINED SPOTTER

Hail in GUTHRIE, IOWA
From 10-MAY-01 16:39:00 to 10-MAY-01 16:39:00 (CST)
Location: BAGLEY
Magnitude: 1.00 
Property damage: 4K
Reported by: TRAINED SPOTTER

Tornado in TAMA, IOWA
From 10-MAY-01 16:40:00 to 10-MAY-01 16:40:00 (CST)
Location: BUCKINGHAM
Tornado F-scale: F0
Property damage: 1K
Reported by: TRAINED SPOTTER

Brief touchdown in open country.

Tornado in TAMA, IOWA
From 10-MAY-01 16:43:00 to 10-MAY-01 16:43:00 (CST)
Location: TRAER
Tornado F-scale: F0
Property damage: 1K
Reported by: TRAINED SPOTTER

Brief touchdown in open country.

Hail in BLACK HAWK, IOWA
From 10-MAY-01 16:45:00 to 10-MAY-01 16:45:00 (CST)
Location: CEDAR FALLS
Magnitude: 0.88 
Property damage: 3K
Reported by: TRAINED SPOTTER

Hail in WARREN, IOWA
From 10-MAY-01 19:22:00 to 10-MAY-01 19:22:00 (CST)
Location: INDIANOLA
Magnitude: 1.00 
Property damage: 5K
Reported by: TRAINED SPOTTER

Thunderstorm Wind in MADISON, IOWA
From 10-MAY-01 19:23:00 to 10-MAY-01 19:23:00 (CST)
Location: TRURO
Magnitude: 52 E
Property damage: 3K
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in LUCAS, IOWA
From 10-MAY-01 19:30:00 to 10-MAY-01 19:30:00 (CST)
Location: CHARITON
Magnitude: 50 E
Property damage: 2K
Reported by: EMERGENCY MANAGER

Hail in DALLAS, IOWA
From 10-MAY-01 18:15:00 to 10-MAY-01 18:15:00 (CST)
Location: WAUKEE
Magnitude: 0.88 
Property damage: 3K
Reported by: EMERGENCY MANAGER

Hail in JASPER, IOWA
From 10-MAY-01 18:17:00 to 10-MAY-01 18:17:00 (CST)
Location: REASNOR
Magnitude: 1.00 
Property damage: 5K
Reported by: LAW ENFORCEMENT

Hail in POLK, IOWA
From 10-MAY-01 18:23:00 to 10-MAY-01 18:23:00 (CST)
Location: WEST DES MOINES
Magnitude: 0.88 
Property damage: 3K
Reported by: TRAINED SPOTTER

Hail in WARREN, IOWA
From 10-MAY-01 18:28:00 to 10-MAY-01 18:28:00 (CST)
Location: NORWALK
Magnitude: 0.75 
Reported by: EMERGENCY MANAGER

Hail in JASPER, IOWA
From 10-MAY-01 18:29:00 to 10-MAY-01 18:29:00 (CST)
Location: SULLY
Magnitude: 1.00 
Property damage: 5K
Reported by: LAW ENFORCEMENT

Hail in WARREN, IOWA
From 10-MAY-01 18:30:00 to 10-MAY-01 18:30:00 (CST)
Location: CUMMING
Magnitude: 0.75 
Reported by: AMATEUR RADIO

Hail in JASPER, IOWA
From 10-MAY-01 18:36:00 to 10-MAY-01 18:36:00 (CST)
Location: PRAIRIE CITY
Magnitude: 0.88 
Property damage: 3K
Reported by: LAW ENFORCEMENT

Hail in POWESHIEK, IOWA
From 10-MAY-01 18:37:00 to 10-MAY-01 18:37:00 (CST)
Location: HARTWICK
Magnitude: 0.75 
Reported by: LAW ENFORCEMENT

Hail in WARREN, IOWA
From 10-MAY-01 18:43:00 to 10-MAY-01 18:43:00 (CST)
Location: CUMMING
Magnitude: 1.00 
Property damage: 5K
Reported by: LAW ENFORCEMENT

Hail in MADISON, IOWA
From 10-MAY-01 19:39:00 to 10-MAY-01 19:39:00 (CST)
Location: TRURO
Magnitude: 1.00 
Property damage: 5K
Reported by: LAW ENFORCEMENT

Hail in WARREN, IOWA
From 10-MAY-01 19:39:00 to 10-MAY-01 19:39:00 (CST)
Location: NEW VIRGINIA
Magnitude: 1.00 
Property damage: 5K
Reported by: LAW ENFORCEMENT

Hail in MADISON, IOWA
From 10-MAY-01 19:39:00 to 10-MAY-01 19:39:00 (CST)
Location: TRURO
Magnitude: 1.00 
Property damage: 5K
Reported by: LAW ENFORCEMENT

Hail in MAHASKA, IOWA
From 10-MAY-01 19:57:00 to 10-MAY-01 19:57:00 (CST)
Location: OSKALOOSA
Magnitude: 0.75 
Reported by: LAW ENFORCEMENT

Hail in MAHASKA, IOWA
From 10-MAY-01 19:57:00 to 10-MAY-01 19:57:00 (CST)
Location: NEW SHARON
Magnitude: 0.75 
Reported by: LAW ENFORCEMENT

Hail in WAPELLO, IOWA
From 10-MAY-01 20:00:00 to 10-MAY-01 20:00:00 (CST)
Location: OTTUMWA
Magnitude: 0.75 
Reported by: EMERGENCY MANAGER

Flash Flood in MONROE, IOWA
From 10-MAY-01 20:30:00 to 10-MAY-01 23:45:00 (CST)
Location: COUNTYWIDE
Property damage: 150K
Reported by: LAW ENFORCEMENT

Flash Flood in GRUNDY, IOWA
From 10-MAY-01 16:30:00 to 10-MAY-01 18:00:00 (CST)
Location: SOUTH PORTION
Property damage: 75K
Reported by: NEWSPAPER

Hail in STORY, IOWA
From 10-MAY-01 16:44:00 to 10-MAY-01 16:44:00 (CST)
Location: AMES
Magnitude: 0.88 
Property damage: 3K
Reported by: NWS EMPLOYEE(OFF DUTY)

Hail in HARDIN, IOWA
From 10-MAY-01 15:37:00 to 10-MAY-01 15:37:00 (CST)
Location: ELDORA
Magnitude: 1.75 
Property damage: 25K
Reported by: BROADCAST MEDIA

Hail in BLACK HAWK, IOWA
From 10-MAY-01 15:39:00 to 10-MAY-01 15:39:00 (CST)
Location: DUNKERTON
Magnitude: 1.00 
Property damage: 5K
Reported by: EMERGENCY MANAGER

Hail in BOONE, IOWA
From 10-MAY-01 15:51:00 to 10-MAY-01 15:51:00 (CST)
Location: OGDEN
Magnitude: 1.75 
Property damage: 20K
Reported by: BROADCAST MEDIA

Hail in HARDIN, IOWA
From 10-MAY-01 15:58:00 to 10-MAY-01 15:58:00 (CST)
Location: ELDORA
Magnitude: 2.00 
Property damage: 25K
Reported by: TRAINED SPOTTER

Hail in GRUNDY, IOWA
From 10-MAY-01 16:00:00 to 10-MAY-01 16:00:00 (CST)
Location: CONRAD
Magnitude: 2.00 
Property damage: 30K
Reported by: NEWSPAPER

Hail in GRUNDY, IOWA
From 10-MAY-01 16:02:00 to 10-MAY-01 16:02:00 (CST)
Location: BEAMAN
Magnitude: 2.00 
Property damage: 20K
Reported by: NEWSPAPER

Hail in MARSHALL, IOWA
From 10-MAY-01 16:04:00 to 10-MAY-01 16:04:00 (CST)
Location: GREEN MTN
Magnitude: 2.00 
Property damage: 10K
Reported by: NEWSPAPER

Hail in BUTLER, IOWA
From 10-MAY-01 16:02:00 to 10-MAY-01 16:02:00 (CST)
Location: KESLEY
Magnitude: 1.75 
Property damage: 10K
Reported by: OFFICIAL NWS OBS.

Hail in GUTHRIE, IOWA
From 10-MAY-01 17:43:00 to 10-MAY-01 17:43:00 (CST)
Location: BAGLEY
Magnitude: 1.00 
Property damage: 5K
Reported by: LAW ENFORCEMENT

Hail in DALLAS, IOWA
From 10-MAY-01 17:44:00 to 10-MAY-01 17:44:00 (CST)
Location: REDFIELD
Magnitude: 1.75 
Property damage: 20K
Reported by: EMERGENCY MANAGER

Hail in DALLAS, IOWA
From 10-MAY-01 17:45:00 to 10-MAY-01 17:45:00 (CST)
Location: REDFIELD
Magnitude: 1.00 
Property damage: 5K
Reported by: AMATEUR RADIO

Hail in JASPER, IOWA
From 10-MAY-01 17:52:00 to 10-MAY-01 17:52:00 (CST)
Location: NEWTON
Magnitude: 1.00 
Property damage: 5K
Reported by: UNKNOWN

Hail in DALLAS, IOWA
From 10-MAY-01 18:00:00 to 10-MAY-01 18:00:00 (CST)
Location: ADEL
Magnitude: 1.00 
Property damage: 5K
Reported by: LAW ENFORCEMENT

Hail in HARDIN, IOWA
From 10-MAY-01 15:28:00 to 10-MAY-01 15:28:00 (CST)
Location: ELDORA
Magnitude: 1.50 
Property damage: 10K
Reported by: LAW ENFORCEMENT

Hail in HARDIN, IOWA
From 10-MAY-01 15:30:00 to 10-MAY-01 15:30:00 (CST)
Location: ELDORA
Magnitude: 1.00 
Property damage: 3K
Reported by: TRAINED SPOTTER

Tornado in GREENE, IOWA
From 10-MAY-01 15:37:00 to 10-MAY-01 15:37:00 (CST)
Location: GRAND JCT
Tornado F-scale: F0
Property damage: 1K
Reported by: GENERAL PUBLIC

Brief touchdown in open field

Hail in AUDUBON, IOWA
From 10-MAY-01 16:01:00 to 10-MAY-01 16:01:00 (CST)
Location: AUDUBON
Magnitude: 1.00 
Property damage: 3K
Reported by: TRAINED SPOTTER

Tornado in GRUNDY, IOWA
From 10-MAY-01 16:04:00 to 10-MAY-01 16:07:00 (CST)
Location: CONRAD
Tornado F-scale: F2
Property damage: 150K
Reported by: LAW ENFORCEMENT

Most in open country.  One barn hit and destroyed.

Hail in GRUNDY, IOWA
From 10-MAY-01 16:08:00 to 10-MAY-01 16:08:00 (CST)
Location: IVESTER
Magnitude: 1.00 
Property damage: 3K
Reported by: TRAINED SPOTTER

Hail in BUTLER, IOWA
From 10-MAY-01 16:08:00 to 10-MAY-01 16:08:00 (CST)
Location: APLINGTON
Magnitude: 1.00 
Property damage: 3K
Reported by: TRAINED SPOTTER

Hail in BUTLER, IOWA
From 10-MAY-01 16:08:00 to 10-MAY-01 16:08:00 (CST)
Location: PARKERSBURG
Magnitude: 1.00 
Property damage: 3K
Reported by: LAW ENFORCEMENT

Tornado in GRUNDY, IOWA
From 10-MAY-01 16:15:00 to 10-MAY-01 16:21:00 (CST)
Location: BEAMAN
Tornado F-scale: F2
Property damage: 35K
Reported by: LAW ENFORCEMENT

Tornado dropped down north of Beaman and progressed southeast.  Crossed into Tama County from Grundy County.  Most of the track was through open country.

Tornado in TAMA, IOWA
From 10-MAY-01 16:21:00 to 10-MAY-01 16:27:00 (CST)
Location: GLADBROOK
Tornado F-scale: F2
Property damage: 35K
Reported by: TRAINED SPOTTER

Tornado moved out of Grundy County into Tama County.  Track was through mostly rural areas with limited damage.

Hail in MADISON, IOWA
From 10-MAY-01 19:09:00 to 10-MAY-01 19:09:00 (CST)
Location: BEVINGTON
Magnitude: 1.00 
Property damage: 5K
Reported by: TRAINED SPOTTER

Hail in POLK, IOWA
From 10-MAY-01 19:15:00 to 10-MAY-01 19:15:00 (CST)
Location: MITCHELLVILLE
Magnitude: 0.75 
Reported by: AMATEUR RADIO

Hail in POWESHIEK, IOWA
From 10-MAY-01 19:15:00 to 10-MAY-01 19:15:00 (CST)
Location: SEARSBORO
Magnitude: 1.00 
Property damage: 5K
Reported by: LAW ENFORCEMENT

Tornado in GRUNDY, IOWA
From 10-MAY-01 16:20:00 to 10-MAY-01 16:22:00 (CST)
Location: CONRAD
Tornado F-scale: F1
Property damage: 50K
Reported by: TRAINED SPOTTER

Tornado was only on the ground briefly, but it did hit a house causing structural damage to it.

Hail in HARDIN, IOWA
From 10-MAY-01 15:09:00 to 10-MAY-01 15:09:00 (CST)
Location: BUCKEYE
Magnitude: 1.00 
Property damage: 5K
Reported by: TRAINED SPOTTER

Hail in HARDIN, IOWA
From 10-MAY-01 15:13:00 to 10-MAY-01 15:13:00 (CST)
Location: HUBBARD
Magnitude: 1.00 
Property damage: 3K
Reported by: LAW ENFORCEMENT

Hail in HARDIN, IOWA
From 10-MAY-01 15:26:00 to 10-MAY-01 15:26:00 (CST)
Location: ELDORA
Magnitude: 1.00 
Property damage: 5K
Reported by: TRAINED SPOTTER

Hail in JASPER, IOWA
From 10-MAY-01 18:00:00 to 10-MAY-01 18:00:00 (CST)
Location: NEWTON
Magnitude: 1.00 
Property damage: 5K
Reported by: LAW ENFORCEMENT

Hail in DALLAS, IOWA
From 10-MAY-01 18:07:00 to 10-MAY-01 18:07:00 (CST)
Location: ADEL
Magnitude: 1.00 
Property damage: 5K
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in STORY, IOWA
From 10-MAY-01 17:10:00 to 10-MAY-01 17:10:00 (CST)
Location: COLLINS
Magnitude: 65 E
Property damage: 20K
Reported by: UNKNOWN

Hail in MARSHALL, IOWA
From 10-MAY-01 17:12:00 to 10-MAY-01 17:12:00 (CST)
Location: STATE CENTER
Magnitude: 2.75 
Property damage: 30K
Reported by: TRAINED SPOTTER

Hail in MARSHALL, IOWA
From 10-MAY-01 17:15:00 to 10-MAY-01 17:15:00 (CST)
Location: RHODES
Magnitude: 1.75 
Property damage: 15K
Reported by: TRAINED SPOTTER

Hail in GUTHRIE, IOWA
From 10-MAY-01 17:20:00 to 10-MAY-01 17:20:00 (CST)
Location: YALE
Magnitude: 1.00 
Property damage: 5K
Reported by: NWS EMPLOYEE(OFF DUTY)

Hail in DALLAS, IOWA
From 10-MAY-01 17:25:00 to 10-MAY-01 17:25:00 (CST)
Location: LINDEN
Magnitude: 1.00 
Property damage: 5K
Reported by: TRAINED SPOTTER

Hail in MARSHALL, IOWA
From 10-MAY-01 17:28:00 to 10-MAY-01 17:28:00 (CST)
Location: RHODES
Magnitude: 1.50 
Property damage: 15K
Reported by: TRAINED SPOTTER

Hail in MARSHALL, IOWA
From 10-MAY-01 17:32:00 to 10-MAY-01 17:32:00 (CST)
Location: MELBOURNE
Magnitude: 0.88 
Property damage: 3K
Reported by: AMATEUR RADIO

Hail in MARSHALL, IOWA
From 10-MAY-01 17:36:00 to 10-MAY-01 17:36:00 (CST)
Location: MELBOURNE
Magnitude: 0.88 
Property damage: 3K
Reported by: TRAINED SPOTTER

Hail in DALLAS, IOWA
From 10-MAY-01 17:37:00 to 10-MAY-01 17:37:00 (CST)
Location: REDFIELD
Magnitude: 0.75 
Reported by: TRAINED SPOTTER

Hail in DALLAS, IOWA
From 10-MAY-01 17:40:00 to 10-MAY-01 17:40:00 (CST)
Location: REDFIELD
Magnitude: 1.50 
Property damage: 15K
Reported by: AMATEUR RADIO

Hail in POWESHIEK, IOWA
From 10-MAY-01 19:15:00 to 10-MAY-01 19:15:00 (CST)
Location: MONTEZUMA
Magnitude: 0.75 
Reported by: LAW ENFORCEMENT

Hail in MADISON, IOWA
From 10-MAY-01 19:17:00 to 10-MAY-01 19:17:00 (CST)
Location: TRURO
Magnitude: 1.75 
Property damage: 20K
Reported by: LAW ENFORCEMENT

Hail in MADISON, IOWA
From 10-MAY-01 19:17:00 to 10-MAY-01 19:17:00 (CST)
Location: PERU
Magnitude: 1.75 
Property damage: 20K
Reported by: LAW ENFORCEMENT

Hail in WARREN, IOWA
From 10-MAY-01 19:18:00 to 10-MAY-01 19:18:00 (CST)
Location: ST MARYS
Magnitude: 1.00 
Property damage: 5K
Reported by: LAW ENFORCEMENT

Hail in MARION, IOWA
From 10-MAY-01 19:21:00 to 10-MAY-01 19:21:00 (CST)
Location: PLEASANTVILLE
Magnitude: 1.00 
Property damage: 5K
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in MARION, IOWA
From 10-MAY-01 19:21:00 to 10-MAY-01 19:21:00 (CST)
Location: PLEASANTVILLE
Magnitude: 56 E
Property damage: 10K
Reported by: LAW ENFORCEMENT

Hail in WARREN, IOWA
From 10-MAY-01 18:45:00 to 10-MAY-01 18:45:00 (CST)
Location: SPRING HILL
Magnitude: 0.88 
Property damage: 3K
Reported by: AMATEUR RADIO

Hail in POLK, IOWA
From 10-MAY-01 18:47:00 to 10-MAY-01 18:47:00 (CST)
Location: DES MOINES ARPT
Magnitude: 0.75 
Reported by: OFFICIAL NWS OBS.

Hail in JASPER, IOWA
From 10-MAY-01 18:48:00 to 10-MAY-01 18:48:00 (CST)
Location: SULLY
Magnitude: 0.75 
Reported by: TRAINED SPOTTER