Severe thunderstorms broke late in the evening, striking areas hardest from Denver southward.  Locations impacted by the storms included but were not limited to:  Aurora, Castle Rock, Centennial, Highlands Ranch, Lone Tree, Parker, Surrey Ridge.  The storms produced a barrage of large hail, damaging straight line winds, flash flooding and several short lived tornadoes.  The hail ranged in size from 1 to 2 inches in diameter, and caused extensive damage to homes and automobiles.  The hail inundated the roadways with several inches of hail in Douglas County.  Consequently, snow plows had to be called out to clear the roadways. One tornado that touched down near Grover in Weld County ripped a tree from the ground and tossed it approximately twenty feet.
The combination of torrential hail and heavy rain produced flash flooding in parts of Elbert, Douglas and Arapahoe Counties, as thunderstorms brought up to 3.35 inches of rain to some areas within 90 minutes.  In Aurora, Picadilly Road was closed from flooding north of 6th Avenue.  A water rescue took place on South Gun Club Road in Arapahoe County, where floodwaters were rushing to depth of 3 feet.  Flash flooding forced the closure of several streets and roads from Parker south to The Pinery, where the floodwaters inundated the roadway with up to 2 feet in several locations.
At Centennial Airport in Arapahoe County, a historic B-17 Flying Fortress suffered extensive damage as hailstones as large as ping pong balls hit the aircraft. Although the airframe itself did not require repair, the fabric-covered ailerons and elevators were extensively damaged.  The hail came straight down and punched holes in the fabric-covered control surfaces.  The plane landed just hours before the storm hit to participate in the weekend tour stop.  Lightning struck two homes, one in Lakewood and the other in Parker.  Straight line winds downed trees and power lines in Aurora.  As a result, scattered electrical outages affect approximately five thousand residents.

Hail in WELD, COLORADO
From 06-JUN-12 15:57:00 to 06-JUN-12 15:57:00 (MST-7)
Location: BRIGGSDALE
Magnitude: 1.25 
Reported by: Trained Spotter

Hail in WELD, COLORADO
From 06-JUN-12 16:28:00 to 06-JUN-12 16:28:00 (MST-7)
Location: BRIGGSDALE ARPT
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in WELD, COLORADO
From 06-JUN-12 17:00:00 to 06-JUN-12 17:00:00 (MST-7)
Location: BRIGGSDALE
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in WELD, COLORADO
From 06-JUN-12 17:05:00 to 06-JUN-12 17:05:00 (MST-7)
Location: GROVER
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in ARAPAHOE, COLORADO
From 06-JUN-12 17:40:00 to 06-JUN-12 17:40:00 (MST-7)
Location: AURORA CHERRY CREEK
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in DOUGLAS, COLORADO
From 06-JUN-12 18:00:00 to 06-JUN-12 18:00:00 (MST-7)
Location: PARKER
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in DOUGLAS, COLORADO
From 06-JUN-12 18:05:00 to 06-JUN-12 18:05:00 (MST-7)
Location: PARKER
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in DOUGLAS, COLORADO
From 06-JUN-12 18:45:00 to 06-JUN-12 18:45:00 (MST-7)
Location: PARKER
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in DOUGLAS, COLORADO
From 06-JUN-12 20:30:00 to 06-JUN-12 20:30:00 (MST-7)
Location: ACEQUIA
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in DOUGLAS, COLORADO
From 06-JUN-12 20:03:00 to 06-JUN-12 20:03:00 (MST-7)
Location: ACEQUIA
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in ARAPAHOE, COLORADO
From 06-JUN-12 19:56:00 to 06-JUN-12 19:56:00 (MST-7)
Location: AURORA CHERRY CREEK
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in ARAPAHOE, COLORADO
From 06-JUN-12 19:48:00 to 06-JUN-12 19:48:00 (MST-7)
Location: AURORA CHERRY CREEK
Magnitude: 1.50 
Reported by: Trained Spotter

Hail in DOUGLAS, COLORADO
From 06-JUN-12 19:24:00 to 06-JUN-12 19:24:00 (MST-7)
Location: ORSA
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in DOUGLAS, COLORADO
From 06-JUN-12 20:40:00 to 06-JUN-12 20:40:00 (MST-7)
Location: PARKER
Magnitude: 1.25 
Reported by: Public

Hail in DOUGLAS, COLORADO
From 06-JUN-12 21:35:00 to 06-JUN-12 21:35:00 (MST-7)
Location: ACEQUIA
Magnitude: 1.75 
Reported by: Trained Spotter

Hail in DOUGLAS, COLORADO
From 06-JUN-12 21:29:00 to 06-JUN-12 21:29:00 (MST-7)
Location: TOMAH
Magnitude: 0.88 
Reported by: Trained Spotter

Hail in DOUGLAS, COLORADO
From 06-JUN-12 19:54:00 to 06-JUN-12 19:54:00 (MST-7)
Location: PARKER
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in DOUGLAS, COLORADO
From 06-JUN-12 21:55:00 to 06-JUN-12 21:55:00 (MST-7)
Location: ACEQUIA
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in ARAPAHOE, COLORADO
From 06-JUN-12 22:10:00 to 06-JUN-12 22:10:00 (MST-7)
Location: SULLIVAN
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in DOUGLAS, COLORADO
From 06-JUN-12 22:08:00 to 06-JUN-12 22:08:00 (MST-7)
Location: ACEQUIA
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in ARAPAHOE, COLORADO
From 06-JUN-12 22:00:00 to 06-JUN-12 22:00:00 (MST-7)
Location: SULLIVAN
Magnitude: 2.00 
Reported by: Trained Spotter

A B-17 was extensively damaged by hail.

Hail in JEFFERSON, COLORADO
From 06-JUN-12 23:00:00 to 06-JUN-12 23:00:00 (MST-7)
Location: LAKEWOOD
Magnitude: 1.50 
Reported by: Trained Spotter

Hail in ARAPAHOE, COLORADO
From 06-JUN-12 23:36:00 to 06-JUN-12 23:36:00 (MST-7)
Location: SHERIDAN
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in ARAPAHOE, COLORADO
From 06-JUN-12 23:55:00 to 06-JUN-12 23:55:00 (MST-7)
Location: SOUTH GLENN
Magnitude: 1.00 
Property damage: 160.00M
Reported by: Trained Spotter

Tornado in DENVER, COLORADO
From 06-JUN-12 16:05:00 to 06-JUN-12 16:05:00 (MST-7)
Location: LOWRY AFB
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A small landspout touched down north of Denver International Airport but did no damage.

Tornado in WELD, COLORADO
From 06-JUN-12 17:38:00 to 06-JUN-12 17:38:00 (MST-7)
Location: GROVER
Tornado F-scale: EF0
Property damage: 0.00K
Reported by: Trained Spotter

A tornado touched down a ripped a small tree from the ground and threw it a distance of 20 feet.

Tornado in ARAPAHOE, COLORADO
From 06-JUN-12 18:45:00 to 06-JUN-12 18:45:00 (MST-7)
Location: (BKF)BUCKLEY AIR FORCE BASE
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A small tornado touched down but did no damage.

Tornado in DOUGLAS, COLORADO
From 06-JUN-12 18:40:00 to 06-JUN-12 18:40:00 (MST-7)
Location: FRANKTOWN
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A small tornado touched down but did no damage.

Tornado in ELBERT, COLORADO
From 06-JUN-12 18:30:00 to 06-JUN-12 18:30:00 (MST-7)
Location: ELIZABETH
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A small tornado touched down but did no damage.

Thunderstorm Wind in DENVER, COLORADO
From 06-JUN-12 19:57:00 to 06-JUN-12 19:57:00 (MST-7)
Location: LOWRY AFB
Magnitude: 57.00 MG
Reported by: Mesonet

Tornado in ELBERT, COLORADO
From 06-JUN-12 18:44:00 to 06-JUN-12 18:44:00 (MST-7)
Location: ELIZABETH
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A small tornado touched down but did no damage.

Tornado in ELBERT, COLORADO
From 06-JUN-12 19:51:00 to 06-JUN-12 19:51:00 (MST-7)
Location: ELIZABETH
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A small tornado touched down but did no damage.

Lightning in DOUGLAS, COLORADO
From 06-JUN-12 20:15:00 to 06-JUN-12 20:15:00 (MST-7)
Location: PARKER
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Lightning struck a home and damaged the attic.

Lightning in JEFFERSON, COLORADO
From 06-JUN-12 22:45:00 to 06-JUN-12 22:45:00 (MST-7)
Location: LAKEWOOD
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Lightning struck a home in Lakewood and caused extensive electrical damage.

Flash Flood in DOUGLAS, COLORADO
From 06-JUN-12 19:30:00 to 06-JUN-12 22:30:00 (MST-7)
Location: PARKER
Flood cause: Heavy Rain
Property damage: 50.00K
Crop damage: 50.00K
Reported by: Trained Spotter

Several roads were washed out from The Pinery to 3 miles west of The Pinery.

Flash Flood in ARAPAHOE, COLORADO
From 06-JUN-12 19:00:00 to 06-JUN-12 21:15:00 (MST-7)
Location: BYERS
Flood cause: Heavy Rain
Property damage: 50.00K
Crop damage: 50.00K
Reported by: Trained Spotter

Flash flooding forced the closure of Quincy Road; South Gun Club Road, between East Exposition Avenue and East Alameda Avenue; South Picadilly Road, between State Highway 30 and East 6th Avenue; and County Road 50, between Delbert Road and County Road 17.

Flash Flood in DOUGLAS, COLORADO
From 06-JUN-12 22:00:00 to 06-JUN-12 22:30:00 (MST-7)
Location: SEDALIA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 15.00K
Reported by: River/Stream Gage

Heavy rain allowed Plum Creek to exceed flood stage by nearly a foot at Sedalia which resulted in lowland flooding.

Hail in ARAPAHOE, COLORADO
From 06-JUN-12 17:45:00 to 06-JUN-12 17:45:00 (MST-7)
Location: AURORA CHERRY CREEK
Magnitude: 1.75 
Reported by: Trained Spotter

Hail in DOUGLAS, COLORADO
From 06-JUN-12 19:30:00 to 06-JUN-12 19:30:00 (MST-7)
Location: PARKER
Magnitude: 1.75 
Reported by: Trained Spotter