A powerful complex of thunderstorms, known as a bow echo, moved across Missouri and Illinois during the late evening hours of June 26th and early morning hours of June 27th. The line, which raced east at 60 to 70 mph, produced widespread winds of 40 to 60 mph along and north of Interstate 70.  Storm assessment teams from the National Weather Service in St. Louis evaluated the most intense damage which occurred over northeast Missouri and west central Illinois.  From the extreme damage that occurred in localized areas, it appears that wind speeds reached 70 to 100 mph. The extensive nature of the damage caused power outages to at least 55,000 customers. Some did not have power return until Tuesday night.  Also, there were several reports of flash flooding, especially over northeastern Missouri due to the already saturated soils from previous rains over the past week.

Thunderstorm Wind in BOONE, MISSOURI
From 27-JUN-11 00:14:00 to 27-JUN-11 00:17:00 (CST-6)
Location: COLUMBIA
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm winds blew down several trees on the west side of town.

Thunderstorm Wind in AUDRAIN, MISSOURI
From 27-JUN-11 00:10:00 to 27-JUN-11 00:15:00 (CST-6)
Location: MEXICO
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

Thunderstorm winds blew down several trees, tree limbs and power lines around town.  One large tree limb pulled down a power line and snapped the power pole it was attached to.  Parts of the tree limb and power pole caused minor damage to an unoccupied van parked nearby.

Hail in ST. CHARLES, MISSOURI
From 27-JUN-11 01:33:00 to 27-JUN-11 01:33:00 (CST-6)
Location: ST PETERS
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in BOONE, MISSOURI
From 27-JUN-11 00:26:00 to 27-JUN-11 00:28:00 (CST-6)
Location: ASHLAND
Magnitude: 54.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Thunderstorm winds blew down several trees and tree limbs around town.  Also, several homes lost a few shingles and some siding.  A couple of light poles were blown down as well.

Thunderstorm Wind in RALLS, MISSOURI
From 27-JUN-11 00:25:00 to 27-JUN-11 00:25:00 (CST-6)
Location: NEW LONDON
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Thunderstorm winds blew down several trees and uprooted several more.

Thunderstorm Wind in LEWIS, MISSOURI
From 26-JUN-11 23:55:00 to 26-JUN-11 23:55:00 (CST-6)
Location: LA BELLE
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

An intense bow echo moved through LaBelle, blowing down numerous trees, tree limbs and power lines.

Thunderstorm Wind in LEWIS, MISSOURI
From 27-JUN-11 00:04:00 to 27-JUN-11 00:04:00 (CST-6)
Location: LEWISTOWN
Magnitude: 65.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

An intense bow echo moved through Lewistown, blowing down numerous trees, tree limbs and power lines.  Two large trees fell onto homes in town causing extensive damage.  One house had its roof shifted which caused the ceiling to crash to the floor.  No injuries were reported.

Thunderstorm Wind in JEFFERSON, MISSOURI
From 27-JUN-11 01:45:00 to 27-JUN-11 01:45:00 (CST-6)
Location: MURPHY
Magnitude: 55.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in FRANKLIN, MISSOURI
From 27-JUN-11 01:42:00 to 27-JUN-11 01:42:00 (CST-6)
Location: GRAY SUMMIT
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in COLE, MISSOURI
From 27-JUN-11 00:40:00 to 27-JUN-11 00:40:00 (CST-6)
Location: JEFFERSON CITY
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

Thunderstorm winds blew down several power lines around town.  One power line fell across part of the west bound lanes of U.S. Highway 54, so the westbound lanes had to be closed temporarily closed until the line was removed.

Thunderstorm Wind in LEWIS, MISSOURI
From 27-JUN-11 00:10:00 to 27-JUN-11 00:10:00 (CST-6)
Location: EWING
Magnitude: 65.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

An intense bow echo moved through Ewing, blowing down numerous trees, tree limbs and power lines.  The radio tower at the Ewing Fire Station was blown down on top of the station.  Also, one tree fell onto a mobile home causing extensive damage.  Another mobile home had part of its tin roof ripped off.  A nearby carport was flipped over onto an unoccupied car.

Thunderstorm Wind in KNOX, MISSOURI
From 26-JUN-11 23:27:00 to 27-JUN-11 00:00:00 (CST-6)
Location: HURDLAND
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A bow echo moved eastward across Knox county.  Numerous trees, tree limbs and power lines were blown down countywide.  Some of the trees blown down were three feet in diameter.

Hail in FRANKLIN, MISSOURI
From 27-JUN-11 01:42:00 to 27-JUN-11 01:42:00 (CST-6)
Location: GRAY SUMMIT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Flash Flood in KNOX, MISSOURI
From 26-JUN-11 21:00:00 to 27-JUN-11 07:30:00 (CST-6)
Location: GREENSBURG
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Up to four inches of rain fell in a short amount of time onto already saturated soils causing flash flooding.  Numerous roads were flooded including Routes K, J and B, as well as Highway 11.  Also, Highway 151 just east of Novelty was flooded.

Thunderstorm Wind in FRANKLIN, MISSOURI
From 27-JUN-11 01:42:00 to 27-JUN-11 01:42:00 (CST-6)
Location: ST CLAIR
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm winds blew down several large trees as well as numerous tree limbs.  Also, a couple of homes sustained moderate shingle damage.

Thunderstorm Wind in MONROE, MISSOURI
From 27-JUN-11 00:05:00 to 27-JUN-11 00:06:00 (CST-6)
Location: MONROE CITY
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

An intense bow echo moved through the area knocking down numerous trees, tree limbs and power lines.  The doors were blown off of a couple of hangers at Monroe City Regional Airport, damaging several planes.

Thunderstorm Wind in RALLS, MISSOURI
From 27-JUN-11 00:11:00 to 27-JUN-11 00:12:00 (CST-6)
Location: HATCH
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Thunderstorm winds blew about a third of the shingles off of two homes in this location.  Also, several large tree limbs were blown down.

Hail in KNOX, MISSOURI
From 26-JUN-11 19:45:00 to 26-JUN-11 19:45:00 (CST-6)
Location: BARING
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in MONROE, MISSOURI
From 26-JUN-11 23:45:00 to 26-JUN-11 23:50:00 (CST-6)
Location: MADISON
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

An intense bow echo moved through the area, blowing down numerous trees, tree limbs and power lines.  Near Holliday on U.S. Highway 24, a large machine shed was destroyed.

Hail in LEWIS, MISSOURI
From 26-JUN-11 20:20:00 to 26-JUN-11 20:20:00 (CST-6)
Location: LEWISTOWN PHLLPS ARP
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm Wind in MARION, MISSOURI
From 27-JUN-11 00:27:00 to 27-JUN-11 00:30:00 (CST-6)
Location: HANNIBAL MUNI ARPT
Magnitude: 53.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

An intense bow echo moved through Hannibal knocking down numerous trees, tree limbs and power lines.  A large portion of a tree fell onto a house causing damage in several locations on the roof, allowing water into the residence.  The weight of the tree limb caused rear portion of the roof to collapse into the attic area of the house.  No injuries were reported.  Several fallen trees pulled down power lines and poles when they fell.

Hail in ST. FRANCOIS, MISSOURI
From 26-JUN-11 15:33:00 to 26-JUN-11 15:33:00 (CST-6)
Location: BLACKWELL
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in PIKE, MISSOURI
From 27-JUN-11 00:25:00 to 27-JUN-11 00:25:00 (CST-6)
Location: FRANKFORD
Magnitude: 65.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

An intense bow echo moved through Frankford blowing down numerous trees, tree limbs and power lines.  Several large trees were also uprooted including a tree that was over 200 years old.

Thunderstorm Wind in PIKE, MISSOURI
From 27-JUN-11 00:35:00 to 27-JUN-11 00:35:00 (CST-6)
Location: LOUISIANA
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

An intense bow echo moved through Louisiana blowing down several trees, numerous tree limbs and power lines.  Several large tree limbs blocked a couple of streets in town.  No structural damage or injuries were reported.

Hail in WASHINGTON, MISSOURI
From 26-JUN-11 15:53:00 to 26-JUN-11 15:53:00 (CST-6)
Location: CONNON MINES
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Flash Flood in WASHINGTON, MISSOURI
From 26-JUN-11 19:00:00 to 26-JUN-11 21:30:00 (CST-6)
Location: POTOSI
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Up to two inches of rain fell in a short amount of time causing flash flooding.  Several roads were flooded including Highway E between Blackwell and Cadet.

Flash Flood in LEWIS, MISSOURI
From 26-JUN-11 21:15:00 to 27-JUN-11 07:30:00 (CST-6)
Location: LA GRANGE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Up to four inches of rain fell onto already saturated soils causing flash flooding.  In Canton, almost two and a half inches of rain fell in about an hour.  Several homes had water in them due to the flash flooding.  Also, numerous roads were flooded.

Thunderstorm Wind in LEWIS, MISSOURI
From 27-JUN-11 00:10:00 to 27-JUN-11 00:10:00 (CST-6)
Location: MONTICELLO
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

An intense bow echo moved through Monticello, blowing down numerous tree limbs and power lines.

Thunderstorm Wind in LEWIS, MISSOURI
From 27-JUN-11 00:15:00 to 27-JUN-11 00:15:00 (CST-6)
Location: CANTON
Magnitude: 54.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

An intense bow echo moved through Canton, blowing down numerous trees, tree limbs and power lines.  A 62 mph wind gust was measured at Lock and Dam 20.

Thunderstorm Wind in LEWIS, MISSOURI
From 27-JUN-11 00:20:00 to 27-JUN-11 00:20:00 (CST-6)
Location: LA GRANGE
Magnitude: 70.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

An intense bow echo moved through LaGrange, blowing down numerous trees, tree limbs and power lines.  Also, a large barn lost most of its roof and parts of several walls.

Tornado in MONROE, MISSOURI
From 27-JUN-11 00:05:00 to 27-JUN-11 00:08:00 (CST-6)
Location: MONROE CITY REGNL AR
Tornado F-scale: EF1
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A tornado touched down about 3.5 miles south of Monroe City on the west side of U.S. Highway 24 and travelled to the southeast, crossing the highway before lifting and dissipating along County Road 591.  There was significant tree damage along the path.  Trees were 60 to 80 feet tall with trunk diameters of 3 to 4 feet.  Some of the trees were snapped a third to half way up.  Other large trees were uprooted.  Some of the large tree limbs were tossed 50 to 70 yards to the east southeast.  The total path length was four tenths of a mile and the max width was 40 yards.  The tornado was rated an EF1.

Thunderstorm Wind in SHELBY, MISSOURI
From 26-JUN-11 23:45:00 to 26-JUN-11 23:45:00 (CST-6)
Location: BETHEL
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

A intense bow echo moved through the area, blowing down numerous large trees, tree limbs and power lines.  Several power poles were snapped as well.

Thunderstorm Wind in WARREN, MISSOURI
From 27-JUN-11 00:55:00 to 27-JUN-11 01:00:00 (CST-6)
Location: WARRENTON
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm winds blew down several trees, tree limbs and power lines.  One tree fell onto an unoccupied car in Warrenton causing major damage.

Thunderstorm Wind in MONTGOMERY, MISSOURI
From 27-JUN-11 00:30:00 to 27-JUN-11 00:30:00 (CST-6)
Location: MONTGOMERY CITY
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm wind blew down several large tree limbs.

Hail in WASHINGTON, MISSOURI
From 26-JUN-11 15:15:00 to 26-JUN-11 15:15:00 (CST-6)
Location: CONNON MINES
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in WASHINGTON, MISSOURI
From 26-JUN-11 15:19:00 to 26-JUN-11 15:19:00 (CST-6)
Location: CONNON MINES
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in WASHINGTON, MISSOURI
From 26-JUN-11 15:32:00 to 26-JUN-11 15:32:00 (CST-6)
Location: CADET
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in FRANKLIN, MISSOURI
From 27-JUN-11 01:15:00 to 27-JUN-11 01:15:00 (CST-6)
Location: NEW HAVEN
Magnitude: 61.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in GASCONADE, MISSOURI
From 27-JUN-11 01:22:00 to 27-JUN-11 01:22:00 (CST-6)
Location: DRAKE
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in RALLS, MISSOURI
From 27-JUN-11 00:14:00 to 27-JUN-11 00:20:00 (CST-6)
Location: CENTER
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

An intense bow echo moved through blowing down numerous large trees, tree limbs and power lines.  Just southwest of Center on Highway 19, a line of trees extending about 200 yards (30 to 50 feet tall) were uprooted.  In Center, numerous tree limbs were blown down and a few trees were uprooted.  Four homes sustained minor roof damage from fallen tree limbs.  Further northeast along Highway 19, several power poles were snapped off.  In New London, several more trees were blown down, as well as numerous tree limbs.

Tornado in SHELBY, MISSOURI
From 26-JUN-11 23:45:00 to 26-JUN-11 23:48:00 (CST-6)
Location: SHELBINA
Tornado F-scale: EF1
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

The first tornado formed near Elm Street and Douglas Avenue, north of U.S. Highway 36 at approximately 1245 a.m. CDT.  The roof and walls of a corrugated steel building buckled on the west and south sides, along with a portion of the roof.  The tornado moved across U.S. Highway 36 and destroyed three unoccupied house trailers.  Debris was tossed about 100 yards from the trailers. The tornado continued to move east-southeast and caused roof damage to the town power and water plants on Chestnut Street west of Shelby Street. A portion of the gables holding the roof of the power plant was uplifted and tossed approximately 50 yards to the east.  Much of the water plant's roof was removed and tossed 40 to 50 yard to the east. The tornado then caused minor roof damage on homes and snapped numerous large trees about 10 to 20 feet from the base.  Some of the large branches fell on top of vehicles.  The tornado then caused extensive damage to the roof of the two story town museum on Center Street (Highway 15). Several bricks fell to the ground from the top of the museum roof.  Additional tree damage was found east and southeast of the town museum building.  The path length was 1.15 miles with width varying between 50 and 70 yards.  The tornado was rated an EF1.

Tornado in SHELBY, MISSOURI
From 26-JUN-11 23:47:00 to 26-JUN-11 23:50:00 (CST-6)
Location: SHELBINA
Tornado F-scale: EF1
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

The second tornadic damage track was just to the south of the first tornado.  It began west of South Center Street, where significant tree damage occurred. Some of the trees fell on top of homes.  The tornado traveled east-southeast and hit an assisted living home on Shelbina Avenue.  Roof damage was found at this location.  Other large trees were damaged in the vicinity of the assisted living home.  The tornado continued to the east-southeast and destroyed a large machine shed built in 2008.  The east, south and west sides and the roof of the machine shed were tossed into several corn fields.  The tornado then crossed County Road 441, where it hit a tree line with several trees snapped 15 to 20 feet from the base and tree trunk diameters ranging from 1 to 2.5 feet. The width of the damage in this area was 50 yards.  The path length was 1.22 miles with a max width of 70 yards.  The tornado was rated an EF1.

Hail in LEWIS, MISSOURI
From 27-JUN-11 00:04:00 to 27-JUN-11 00:04:00 (CST-6)
Location: LEWISTOWN
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in MARION, MISSOURI
From 27-JUN-11 00:10:00 to 27-JUN-11 00:25:00 (CST-6)
Location: BENBOW
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

An intense bow echo moved through Marion County. The most significant damage was over northern portions of the county.  Numerous trees, tree limbs and power lines were blown down.  Some of the trees blown down were between 3 and 4 feet in diameter.  A few old barns were blown down by the winds.

Thunderstorm Wind in PIKE, MISSOURI
From 27-JUN-11 00:20:00 to 27-JUN-11 00:30:00 (CST-6)
Location: FARMER
Magnitude: 70.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

An intense bow echo moved through Pike County.  Several large trees, numerous tree limbs and power lines were blown down in Bowling Green.  Part of one fallen tree landed on an unoccupied vehicle destroying it.  No injuries were reported.

Tornado in RALLS, MISSOURI
From 27-JUN-11 00:09:00 to 27-JUN-11 00:12:00 (CST-6)
Location: HASSARD
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A tornado touched down on Hereford Lane, about 3 miles southeast of Monroe City in northwestern Ralls County.  It travelled to the southeast blowing down numerous trees.  Several large trees were snapped half way up the trunk or uprooted within a defined relatively narrow path.  Most of the trees were between 50 and 60 feet tall with trunk diameters varying between 2 and 3 feet wide.  Also, a barn sustained moderate damage with part of its roof blown off.  The tornado lifted and dissipated on Demoss Road.  The total path length was six tenths of a mile with a max width of 70 yards.  The tornado was rated an EF0.

Thunderstorm Wind in SHELBY, MISSOURI
From 26-JUN-11 23:35:00 to 26-JUN-11 23:40:00 (CST-6)
Location: CLARENCE
Magnitude: 70.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

An intense bow echo moved through the Clarence area, blowing down numerous trees, tree limbs and power lines.  Several three foot diameter trees were uprooted three miles south of Clarence.  On the east side of town off of U.S. Highway 36, a feed mill sustained quite a bit of damage.  One 500,000 bushel bin was nearly smashed to the ground and a second one sustained major roof damage.  Two smaller bins were damaged as well.  Just southwest of Clarence, a large machine shed was completely destroyed.  Several 2x4s from the shed were thrown through the roof of a two story home nearby.