A dry line moved across north Texas as an upper level trough moved through the Desert Southwest.  A line of thunderstorms developed and became severe as the night wore on.  Two tornadoes and several downbursts caused significant damage across Grayson County.  Strong winds followed behind a cold front and caused damage to power lines.

Hail in MCLENNAN, TEXAS
From 09-DEC-08 07:46:00 to 09-DEC-08 07:46:00 (CST-6)
Location: ATCO
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Quarter-size hail was reported between Hewitt and McGregor.

Hail in MCLENNAN, TEXAS
From 09-DEC-08 07:55:00 to 09-DEC-08 07:55:00 (CST-6)
Location: WACO
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Reports of pea to penny-size hail were relayed by the broadcast media.

Hail in ANDERSON, TEXAS
From 09-DEC-08 06:36:00 to 09-DEC-08 06:36:00 (CST-6)
Location: MONTALBA
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Numerous reports of nickel-size hail were received from the northwest portion of the county.

Hail in ELLIS, TEXAS
From 09-DEC-08 00:35:00 to 09-DEC-08 00:35:00 (CST-6)
Location: BARDWELL
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Dime to penny-size hail was reported east of Bardwell.

Thunderstorm Wind in GRAYSON, TEXAS
From 08-DEC-08 22:26:00 to 08-DEC-08 22:26:00 (CST-6)
Location: SADLER
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Power poles were blown down across FM 901 in eastern Whitesboro.

Strong Wind in DENTON, TEXAS
From 10-DEC-08 16:00:00 to 10-DEC-08 16:00:00 (CST-6)
Magnitude: 31.00 MG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Newspaper

A crane collapsed at Lewisville Lake after winds caused a barge to break loose from its chains and crash into rocks.  Sustained winds were between 20 and 25 MPH throughout the day with gusts to 35 MPH.

Thunderstorm Wind in GRAYSON, TEXAS
From 08-DEC-08 22:30:00 to 08-DEC-08 22:30:00 (CST-6)
Location: ETHEL
Magnitude: 61.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Law Enforcement

To the east of the tornado, thunderstorm winds damaged roofs and storage buildings east of Collinsville.

Tornado in GRAYSON, TEXAS
From 08-DEC-08 22:22:00 to 08-DEC-08 22:37:00 (CST-6)
Location: COLLINSVILLE
Tornado F-scale: EF1
Property damage: 400.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

According to a storm survey conducted by the National Weather Service in Fort Worth, an EF-1 tornado touched down near Collinsville and moved northeast.  About 20 homes in the Collinsville area 15 homes in the Southmayd area were damaged.  A few businesses were also damaged.  Trees, power lines, and sheds were blown down.  One injury was reported.

Tornado in GRAYSON, TEXAS
From 08-DEC-08 22:43:00 to 08-DEC-08 22:48:00 (CST-6)
Location: DENISON MCKEON ARPT
Tornado F-scale: EF2
Property damage: 750.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

According to a damage survey conducted by the National Weather Service in Fort Worth, a lower EF-2 tornado affected areas of south and southwest Denison.  Trees and power lines were downed.  Dozens of homes, storage shelters, and businesses were damaged.  About 500 homes in the area were without power.