Severe thunderstorms produced damaging winds and large hail, ranging in size from quarters to baseballs.  The hail reportedly piled up to 8 inches deep in Elbert County where the largest hail was observed.  Extensive damage was reported to vehicles near Interstate 70 and State Highway 86.  Intense thunderstorm winds damaged trees and building in Genoa.  Heavy rain produced flash flooding in parts of Elbert and Larimer Counties.  One tornado touched down near Karval.  It reportedly uprooted several trees and destroyed a garage.

Hail in ELBERT, COLORADO
From 04-JUL-10 14:20:00 to 04-JUL-10 14:20:00 (MST-7)
Location: ELIZABETH
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in DENVER, COLORADO
From 04-JUL-10 14:38:00 to 04-JUL-10 14:38:00 (MST-7)
Location: LOWRY AFB
Magnitude: 1.00 
Reported by: NWS Employee

Hail in JEFFERSON, COLORADO
From 04-JUL-10 14:46:00 to 04-JUL-10 14:46:00 (MST-7)
Location: SHAFFERS XRDS
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in JEFFERSON, COLORADO
From 04-JUL-10 15:05:00 to 04-JUL-10 15:05:00 (MST-7)
Location: LONGVIEW
Magnitude: 1.00 
Reported by: Amateur Radio

Hail in ELBERT, COLORADO
From 04-JUL-10 15:11:00 to 04-JUL-10 15:11:00 (MST-7)
Location: KIOWA
Magnitude: 1.75 
Reported by: Trained Spotter

Hail in ELBERT, COLORADO
From 04-JUL-10 15:14:00 to 04-JUL-10 15:14:00 (MST-7)
Location: KIOWA
Magnitude: 1.75 
Reported by: Trained Spotter

Hail in ELBERT, COLORADO
From 04-JUL-10 15:15:00 to 04-JUL-10 15:15:00 (MST-7)
Location: KIOWA
Magnitude: 1.75 
Reported by: Trained Spotter

Hail in ELBERT, COLORADO
From 04-JUL-10 15:15:00 to 04-JUL-10 15:15:00 (MST-7)
Location: KIOWA
Magnitude: 1.75 
Reported by: Trained Spotter

Hail in ARAPAHOE, COLORADO
From 04-JUL-10 15:18:00 to 04-JUL-10 15:18:00 (MST-7)
Location: (BKF)BUCKLEY AIR FORCE BASE
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in DOUGLAS, COLORADO
From 04-JUL-10 15:22:00 to 04-JUL-10 15:22:00 (MST-7)
Location: LARKSPUR
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in LARIMER, COLORADO
From 04-JUL-10 17:15:00 to 04-JUL-10 17:15:00 (MST-7)
Location: MASONVILLE
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in JEFFERSON, COLORADO
From 04-JUL-10 17:20:00 to 04-JUL-10 17:20:00 (MST-7)
Location: GOLDEN
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in DOUGLAS, COLORADO
From 04-JUL-10 17:29:00 to 04-JUL-10 17:29:00 (MST-7)
Location: LOUVIERS
Magnitude: 1.00 
Reported by: Amateur Radio

Hail in ELBERT, COLORADO
From 04-JUL-10 17:48:00 to 04-JUL-10 17:48:00 (MST-7)
Location: KIOWA
Magnitude: 1.50 
Reported by: Trained Spotter

Hail in ELBERT, COLORADO
From 04-JUL-10 18:34:00 to 04-JUL-10 18:34:00 (MST-7)
Location: AGATE
Magnitude: 1.00 
Reported by: Trained Spotter

In addition, thunderstorm winds were estimated to 60 mph.

Hail in ELBERT, COLORADO
From 04-JUL-10 16:52:00 to 04-JUL-10 16:52:00 (MST-7)
Location: KIOWA
Magnitude: 2.75 
Reported by: Storm Chaser

Hail in ELBERT, COLORADO
From 04-JUL-10 16:52:00 to 04-JUL-10 16:52:00 (MST-7)
Location: KIOWA
Magnitude: 2.75 
Reported by: Trained Spotter

Hail in ELBERT, COLORADO
From 04-JUL-10 17:04:00 to 04-JUL-10 17:04:00 (MST-7)
Location: ELIZABETH
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in ELBERT, COLORADO
From 04-JUL-10 17:06:00 to 04-JUL-10 17:06:00 (MST-7)
Location: ELIZABETH
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in LARIMER, COLORADO
From 04-JUL-10 17:15:00 to 04-JUL-10 17:15:00 (MST-7)
Location: MASONVILLE
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in ELBERT, COLORADO
From 04-JUL-10 16:25:00 to 04-JUL-10 16:25:00 (MST-7)
Location: ELBERT
Magnitude: 2.00 
Reported by: Trained Spotter

Hail in ELBERT, COLORADO
From 04-JUL-10 16:25:00 to 04-JUL-10 16:25:00 (MST-7)
Location: KIOWA
Magnitude: 2.00 
Reported by: Trained Spotter

Hail in ELBERT, COLORADO
From 04-JUL-10 16:31:00 to 04-JUL-10 16:31:00 (MST-7)
Location: ELIZABETH
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in ADAMS, COLORADO
From 04-JUL-10 16:38:00 to 04-JUL-10 16:38:00 (MST-7)
Location: COMMERCE CITY
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in ELBERT, COLORADO
From 04-JUL-10 16:42:00 to 04-JUL-10 16:42:00 (MST-7)
Location: ELIZABETH
Magnitude: 1.00 
Reported by: Trained Spotter

Tornado in LINCOLN, COLORADO
From 04-JUL-10 20:15:00 to 04-JUL-10 20:15:00 (MST-7)
Location: KARVAL
Tornado F-scale: EF1
Property damage: 25.00K
Crop damage: 10.00K
Reported by: Trained Spotter

A tornado touched down and destroyed a garage and uprooted several trees.

Hail in LINCOLN, COLORADO
From 04-JUL-10 20:15:00 to 04-JUL-10 20:15:00 (MST-7)
Location: KARVAL
Magnitude: 1.25 
Reported by: Trained Spotter

Thunderstorm Wind in LINCOLN, COLORADO
From 04-JUL-10 19:04:00 to 04-JUL-10 19:04:00 (MST-7)
Location: LIMON
Magnitude: 54.00 MG
Reported by: ASOS

Flash Flood in ELBERT, COLORADO
From 04-JUL-10 16:48:00 to 04-JUL-10 21:30:00 (MST-7)
Location: ELIZABETH
Flood cause: Heavy Rain
Property damage: 25.00K
Crop damage: 25.00K
Reported by: Emergency Manager

Intense thunderstorms, producing heavy rainfall in excess of 5 inches in one hour, produced flash flooding in the vicinity of Elizabeth.  Numerous county roads were washed out.  The combination of heavy rain and hail made it necessary to run snow plows through the town.  Extensive basement flooding was also observed.

Hail in LARIMER, COLORADO
From 04-JUL-10 16:02:00 to 04-JUL-10 16:02:00 (MST-7)
Location: VIRGINIA DALE
Magnitude: 1.50 
Reported by: Trained Spotter

Hail in ELBERT, COLORADO
From 04-JUL-10 16:03:00 to 04-JUL-10 16:03:00 (MST-7)
Location: ELIZABETH
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in LARIMER, COLORADO
From 04-JUL-10 16:08:00 to 04-JUL-10 16:08:00 (MST-7)
Location: VIRGINIA DALE
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in DENVER, COLORADO
From 04-JUL-10 16:23:00 to 04-JUL-10 16:23:00 (MST-7)
Location: (DEN)DENVER INTL ARP
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in ELBERT, COLORADO
From 04-JUL-10 16:24:00 to 04-JUL-10 16:24:00 (MST-7)
Location: KIOWA
Magnitude: 1.75 
Reported by: Trained Spotter

Hail in LINCOLN, COLORADO
From 04-JUL-10 19:09:00 to 04-JUL-10 19:09:00 (MST-7)
Location: (LIC)LIMON ARPT
Magnitude: 1.25 
Reported by: Trained Spotter

Thunderstorm Wind in LINCOLN, COLORADO
From 04-JUL-10 19:01:00 to 04-JUL-10 19:01:00 (MST-7)
Location: LIMON
Magnitude: 60.00 MG
Reported by: ASOS

Hail in LINCOLN, COLORADO
From 04-JUL-10 19:11:00 to 04-JUL-10 19:11:00 (MST-7)
Location: (LIC)LIMON ARPT
Magnitude: 2.50 
Reported by: Trained Spotter

Hail in ELBERT, COLORADO
From 04-JUL-10 14:17:00 to 04-JUL-10 14:17:00 (MST-7)
Location: ELIZABETH
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in ELBERT, COLORADO
From 04-JUL-10 16:45:00 to 04-JUL-10 16:45:00 (MST-7)
Location: KIOWA
Magnitude: 1.50 
Reported by: Trained Spotter

Hail in ELBERT, COLORADO
From 04-JUL-10 16:45:00 to 04-JUL-10 16:45:00 (MST-7)
Location: KIOWA
Magnitude: 2.00 
Reported by: Trained Spotter

Hail in ELBERT, COLORADO
From 04-JUL-10 16:47:00 to 04-JUL-10 16:47:00 (MST-7)
Location: KIOWA
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in ELBERT, COLORADO
From 04-JUL-10 19:15:00 to 04-JUL-10 19:15:00 (MST-7)
Location: MATHESON
Magnitude: 2.75 
Reported by: Public

Hail in LINCOLN, COLORADO
From 04-JUL-10 19:30:00 to 04-JUL-10 19:30:00 (MST-7)
Location: GENOA
Magnitude: 1.25 
Reported by: Public

Hail in ELBERT, COLORADO
From 04-JUL-10 16:48:00 to 04-JUL-10 16:48:00 (MST-7)
Location: FONDIS
Magnitude: 1.75 
Reported by: Trained Spotter

Hail in ELBERT, COLORADO
From 04-JUL-10 16:48:00 to 04-JUL-10 16:48:00 (MST-7)
Location: KIOWA
Magnitude: 1.00 
Reported by: Trained Spotter

Flash Flood in LARIMER, COLORADO
From 04-JUL-10 17:53:00 to 04-JUL-10 19:30:00 (MST-7)
Location: MASONVILLE
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 5.00K
Reported by: Trained Spotter

Flash flooding was reported 1 mile north of Loveland and 3 miles south of Masonville.   State Highways 27 and 29 were inundated with up to a foot of water, rocks and mud.  Heavy rain caused 6 to 10 inches of rain to stream across County Road 27.

Hail in DOUGLAS, COLORADO
From 04-JUL-10 15:30:00 to 04-JUL-10 15:30:00 (MST-7)
Location: SPRUCE
Magnitude: 1.25 
Reported by: Trained Spotter

Hail in DOUGLAS, COLORADO
From 04-JUL-10 15:36:00 to 04-JUL-10 15:36:00 (MST-7)
Location: SPRUCE
Magnitude: 1.25 
Reported by: Trained Spotter

Hail in ARAPAHOE, COLORADO
From 04-JUL-10 15:46:00 to 04-JUL-10 15:46:00 (MST-7)
Location: AURORA CHERRY CREEK
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in LARIMER, COLORADO
From 04-JUL-10 15:48:00 to 04-JUL-10 15:48:00 (MST-7)
Location: RED FEATHER LAKES
Magnitude: 0.75 
Reported by: Trained Spotter

Hail in LARIMER, COLORADO
From 04-JUL-10 15:55:00 to 04-JUL-10 15:55:00 (MST-7)
Location: RED FEATHER LAKES
Magnitude: 1.25 
Reported by: Trained Spotter

Hail in ELBERT, COLORADO
From 04-JUL-10 18:45:00 to 04-JUL-10 18:45:00 (MST-7)
Location: RIVER BEND
Magnitude: 2.75 
Reported by: Trained Spotter

Hail in ELBERT, COLORADO
From 04-JUL-10 18:47:00 to 04-JUL-10 18:47:00 (MST-7)
Location: RIVER BEND
Magnitude: 2.50 
Reported by: Amateur Radio

Hail in ELBERT, COLORADO
From 04-JUL-10 18:52:00 to 04-JUL-10 18:52:00 (MST-7)
Location: SIMLA
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in LINCOLN, COLORADO
From 04-JUL-10 19:04:00 to 04-JUL-10 19:04:00 (MST-7)
Location: LIMON
Magnitude: 1.00 
Reported by: Amateur Radio

Hail in LINCOLN, COLORADO
From 04-JUL-10 19:05:00 to 04-JUL-10 19:05:00 (MST-7)
Location: LIMON
Magnitude: 1.50 
Reported by: Trained Spotter

Hail in ELBERT, COLORADO
From 04-JUL-10 14:14:00 to 04-JUL-10 14:14:00 (MST-7)
Location: ELIZABETH
Magnitude: 1.50 
Reported by: Trained Spotter