In the wake of morning thunderstorms, afternoon sunshine heated an already very humid airmass over west central Missouri and eastern Kansas on Tuesday, June 8 2010, creating a very unstable atmosphere over the region. A slow moving cold front reached a Wichita to Kansas City line by late afternoon, rapidly igniting a long line of strong, slow moving thunderstorms. While the threat of damaging winds and large hail were diminished by the vast number of storms that developed along the front, excessive rainfall quickly became a concern. Training, or repeated thunderstorms tracking over the same area, deluged portions of the Kansas City metro into Cass County. Areas from Overland Park, to Grandview, to Lee's Summit, southward to Peculiar, Pleasant Hill, and adjacent communities, were hit especially hard as two and a half to four inches of rain fell in just a couple hours. Interstate 435 near the Kansas/Missouri state line was turned into a river at rush hour, with water rescues  conducted near Cleveland, Missouri to the southeast. In addition to the torrential rainfall, these storms were prolific lightning producers, with nearly continuous cloud to ground lightning, observed well into the early evening hours. National lightning detection network counts, showed total cloud to ground lightning strikes well into the tens of thousands, but thankfully no damage was reported.
The only severe weather observed in the region, was with one of the first storms that developed in western Johnson County Kansas. This long lived supercell storm tracked southeast into Cass county, and began to show signs of organized rotation as it tracked toward Harrisonville, prompting the issuance of a tornado warning. A brief tornado touched down along the south side of Harrisonville, producing roof and tree damage to a church carport, a commercial business, and a number of trees at nearby residences.

Hail in RANDOLPH, MISSOURI
From 08-JUN-10 18:15:00 to 08-JUN-10 18:15:00 (CST-6)
Location: MOBERLY
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Flash Flood in JACKSON, MISSOURI
From 08-JUN-10 16:14:00 to 08-JUN-10 22:14:00 (CST-6)
Location: RUSKIN HGTS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Red Bridge Road under Highway 71, was reported impassable due to high water.

Flash Flood in JACKSON, MISSOURI
From 08-JUN-10 17:05:00 to 08-JUN-10 23:05:00 (CST-6)
Location: SPRING BRANCH
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Water was reported flowing over the roads.

Thunderstorm Wind in CASS, MISSOURI
From 08-JUN-10 16:15:00 to 08-JUN-10 16:15:00 (CST-6)
Location: RAYMORE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Thunderstorm winds were estimated to 60 mph.

Flash Flood in JACKSON, MISSOURI
From 08-JUN-10 17:11:00 to 08-JUN-10 23:11:00 (CST-6)
Location: KANSAS CITY DOWNTOWN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Major flooding was reported along Highway 79 into the plaza.

Thunderstorm Wind in CASS, MISSOURI
From 08-JUN-10 16:53:00 to 08-JUN-10 16:53:00 (CST-6)
Location: HARRISONVILLE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A large tree was reported to be blown down.

Flash Flood in JACKSON, MISSOURI
From 08-JUN-10 17:50:00 to 08-JUN-10 23:50:00 (CST-6)
Location: MARTIN CITY
Flood cause: Heavy Rain
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Indian Creek near 103rd and Stateline Road was reported flooding. Businesses were affected up to 100 yards from the creek.

Flash Flood in CASS, MISSOURI
From 08-JUN-10 18:00:00 to 09-JUN-10 00:00:00 (CST-6)
Location: JAUDON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Up to two feet of rushing water was reported on area roads.

Tornado in CASS, MISSOURI
From 08-JUN-10 16:39:00 to 08-JUN-10 16:44:00 (CST-6)
Location: HARRISONVILLE
Tornado F-scale: EF0
Property damage: 10.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Storm survey and eye witness accounts, confirm that an EF0 tornado touched down at 17:39 CST a little over one half mile south of Harrisonville. The tornado traveled around 2 miles to the east, before lifting at 17: 44 CST. A church had a roof blown off. There was also minor damage to a commercial building, and a number of trees were also damaged.

Flash Flood in CASS, MISSOURI
From 08-JUN-10 18:08:00 to 09-JUN-10 00:08:00 (CST-6)
Location: CLEVELAND
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Three water rescues were conducted near Cleveland. One was near Highway Y and 251 Road, and the others were in Cleveland.

Flash Flood in JOHNSON, MISSOURI
From 08-JUN-10 18:16:00 to 09-JUN-10 00:16:00 (CST-6)
Location: HOLDEN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Water was reported to be flowing over the road, one mile west of Holden.

Flash Flood in CARROLL, MISSOURI
From 08-JUN-10 19:10:00 to 09-JUN-10 01:10:00 (CST-6)
Location: CARROLLTON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Water was reported over Highway UU, near Big Creek.