A storm system wound itself up over Southeast Colorado, allowing for heavy snow and rain to develop over much of North-Central and Northeast Colorado.  Severe thunderstorms preceded the storm system on the 23rd, affecting the Urban Corridor and Northeast Plains.  Severe weather included:  large hail; up to golfball size, damaging thunderstorm winds and several small tornadoes.
On the 24th, heavy snow fell in the foothills west of Denver and Boulder, where storm totals ranged from 1 to 2 feet.  Heavy snow also occurred along the Palmer Divide, with storm totals from 10 to 16 inches.  Elsewhere, a steady moderate to heavy rainfall was reported.  Denver International Airport measured 1.64 inches of precipitation, which broke the single day record for the 24th of April.  A few short lived tornadoes also developed over Lincoln County, in the vicinity of the surface cyclone.
The heavy wet snow caused several power outages.  In some instances, it took several days to restore power.  Several road closures were reported, including Interstates 25 and 70.  A jackknifed semi-trailer backed up traffic for nearly 20 miles; on southbound I-25, between Denver and Colorado Springs.  In addition, a 50-ton boulder blocked the southbound lane of State Highway 285, near Parmalee Gulch.  Crews had to use explosives to break up the boulder and clear the debris.  Stranded buses and impassable roadways also forced several school closures.

Hail in LOGAN, COLORADO
From 23-APR-07 18:48:00 to 23-APR-07 18:48:00 (MST-7)
Location: ACKERMAN
Magnitude: 1.25 
Reported by: Trained Spotter

Hail in WASHINGTON, COLORADO
From 23-APR-07 18:56:00 to 23-APR-07 18:56:00 (MST-7)
Location: WOODROW
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in MORGAN, COLORADO
From 23-APR-07 19:13:00 to 23-APR-07 19:13:00 (MST-7)
Location: LODI
Magnitude: 0.75 
Reported by: Trained Spotter

Hail in BOULDER, COLORADO
From 23-APR-07 16:19:00 to 23-APR-07 16:19:00 (MST-7)
Location: NIWOT
Magnitude: 0.75 
Reported by: Trained Spotter

Hail in MORGAN, COLORADO
From 23-APR-07 16:28:00 to 23-APR-07 16:28:00 (MST-7)
Location: FT MORGAN ARPT
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in MORGAN, COLORADO
From 23-APR-07 18:48:00 to 23-APR-07 18:48:00 (MST-7)
Location: LODI
Magnitude: 0.75 
Reported by: Trained Spotter

Hail in WASHINGTON, COLORADO
From 23-APR-07 19:13:00 to 23-APR-07 19:13:00 (MST-7)
Location: WOODROW
Magnitude: 0.75 
Reported by: Trained Spotter

Hail in BOULDER, COLORADO
From 23-APR-07 16:11:00 to 23-APR-07 16:11:00 (MST-7)
Location: LOUISVILLE
Magnitude: 0.75 
Reported by: Trained Spotter

Hail in WASHINGTON, COLORADO
From 23-APR-07 19:13:00 to 23-APR-07 19:13:00 (MST-7)
Location: WOODROW
Magnitude: 0.75 
Reported by: Trained Spotter

Hail in BOULDER, COLORADO
From 23-APR-07 16:16:00 to 23-APR-07 16:16:00 (MST-7)
Location: VALMONT
Magnitude: 0.75 
Reported by: Trained Spotter

Hail in MORGAN, COLORADO
From 23-APR-07 16:55:00 to 23-APR-07 16:55:00 (MST-7)
Location: FT MORGAN ARPT
Magnitude: 0.75 
Reported by: Trained Spotter

Hail in ELBERT, COLORADO
From 23-APR-07 17:30:00 to 23-APR-07 17:30:00 (MST-7)
Location: KIOWA
Magnitude: 0.75 
Reported by: Trained Spotter

Hail in BOULDER, COLORADO
From 23-APR-07 16:35:00 to 23-APR-07 16:35:00 (MST-7)
Location: LONGMONT
Magnitude: 0.75 
Reported by: Trained Spotter

Hail in BOULDER, COLORADO
From 23-APR-07 16:37:00 to 23-APR-07 16:37:00 (MST-7)
Location: LONGMONT
Magnitude: 0.88 
Reported by: Trained Spotter

Hail in WASHINGTON, COLORADO
From 23-APR-07 20:51:00 to 23-APR-07 20:51:00 (MST-7)
Location: LST CHNCE CHENOWETH
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in WASHINGTON, COLORADO
From 23-APR-07 21:27:00 to 23-APR-07 21:27:00 (MST-7)
Location: AKRON
Magnitude: 0.88 
Reported by: Trained Spotter

Hail in PHILLIPS, COLORADO
From 23-APR-07 22:14:00 to 23-APR-07 22:14:00 (MST-7)
Location: HOLYOKE ARPT
Magnitude: 1.00 
Reported by: Trained Spotter

Tornado in PHILLIPS, COLORADO
From 23-APR-07 22:00:00 to 23-APR-07 22:00:00 (MST-7)
Location: HOLYOKE ARPT
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A small tornado touched down but did no damage.

Tornado in LINCOLN, COLORADO
From 24-APR-07 11:58:00 to 24-APR-07 11:58:00 (MST-7)
Location: BOYERO
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A small tornado touched down but did no damage.

Hail in MORGAN, COLORADO
From 23-APR-07 16:05:00 to 23-APR-07 16:05:00 (MST-7)
Location: WELDONA
Magnitude: 1.75 
Reported by: Trained Spotter

Thunderstorm Wind in PHILLIPS, COLORADO
From 23-APR-07 22:30:00 to 23-APR-07 22:30:00 (MST-7)
Location: HOLYOKE ARPT
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in LOGAN, COLORADO
From 23-APR-07 18:43:00 to 23-APR-07 18:43:00 (MST-7)
Location: STERLING
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in MORGAN, COLORADO
From 23-APR-07 18:45:00 to 23-APR-07 18:45:00 (MST-7)
Location: HOYT
Magnitude: 1.75 
Reported by: Trained Spotter

Thunderstorm Wind in MORGAN, COLORADO
From 23-APR-07 16:26:00 to 23-APR-07 16:26:00 (MST-7)
Location: FT MORGAN
Magnitude: 52.00 EG
Reported by: Trained Spotter

Hail in ARAPAHOE, COLORADO
From 23-APR-07 17:34:00 to 23-APR-07 17:34:00 (MST-7)
Location: BYERS
Magnitude: 0.88 
Reported by: Trained Spotter

Hail in LOGAN, COLORADO
From 23-APR-07 17:55:00 to 23-APR-07 17:55:00 (MST-7)
Location: WILLARD
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in LOGAN, COLORADO
From 23-APR-07 18:03:00 to 23-APR-07 18:03:00 (MST-7)
Location: WILLARD
Magnitude: 0.75 
Reported by: Trained Spotter

Hail in ELBERT, COLORADO
From 23-APR-07 17:45:00 to 23-APR-07 17:45:00 (MST-7)
Location: KIOWA
Magnitude: 1.75 
Reported by: Trained Spotter

Hail in LOGAN, COLORADO
From 23-APR-07 18:16:00 to 23-APR-07 18:16:00 (MST-7)
Location: STERLING ARPT
Magnitude: 0.75 
Reported by: Trained Spotter

Hail in ADAMS, COLORADO
From 23-APR-07 18:20:00 to 23-APR-07 18:20:00 (MST-7)
Location: STRASBURG
Magnitude: 1.25 
Reported by: Trained Spotter

Hail in LOGAN, COLORADO
From 23-APR-07 18:20:00 to 23-APR-07 18:20:00 (MST-7)
Location: ATWOOD
Magnitude: 1.75 
Reported by: Law Enforcement

Hail in MORGAN, COLORADO
From 23-APR-07 15:39:00 to 23-APR-07 15:39:00 (MST-7)
Location: ORCHARD
Magnitude: 0.88 
Reported by: Trained Spotter

Hail in MORGAN, COLORADO
From 23-APR-07 15:50:00 to 23-APR-07 15:50:00 (MST-7)
Location: GOODRICH
Magnitude: 1.75 
Reported by: Trained Spotter

Hail in MORGAN, COLORADO
From 23-APR-07 19:18:00 to 23-APR-07 19:18:00 (MST-7)
Location: LODI
Magnitude: 0.75 
Reported by: Trained Spotter

Hail in LOGAN, COLORADO
From 23-APR-07 18:32:00 to 23-APR-07 18:32:00 (MST-7)
Location: ATWOOD
Magnitude: 1.75 
Reported by: Law Enforcement

Hail in LOGAN, COLORADO
From 23-APR-07 18:35:00 to 23-APR-07 18:35:00 (MST-7)
Location: STERLING
Magnitude: 1.75 
Reported by: Law Enforcement

Hail in MORGAN, COLORADO
From 23-APR-07 18:35:00 to 23-APR-07 18:35:00 (MST-7)
Location: FT MORGAN
Magnitude: 0.75 
Reported by: Trained Spotter

Hail in BOULDER, COLORADO
From 23-APR-07 16:00:00 to 23-APR-07 16:00:00 (MST-7)
Location: BOULDER
Magnitude: 1.00 
Reported by: Trained Spotter

Tornado in LINCOLN, COLORADO
From 24-APR-07 11:42:00 to 24-APR-07 11:46:00 (MST-7)
Location: BOYERO
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A small tornado moved west into lincoln county from Cheyenne County near Highway 287.