Very light winds, no cloud cover, and a high pressure system over the Tennessee Valley produced an optimal situation for strong radiational cooling.  With cold and dry air in place over the area behind a departed cold front, temperatures dropped below freezing for several hours across northern Alabama as a result. Temperatures ranged from 24 or 25 degrees in the coldest locations to around 31 degrees in other locations.

Frost/Freeze in CULLMAN, ALABAMA
From 28-OCT-08 22:24:00 to 29-OCT-08 08:24:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Temperatures across Cullman county dropped to the freezing mark or below for at least 3 hours. Some locations such as the the Cullman Airport were at or below 32 degrees Fahrenheit for approximately 5 hours.  Low temperatures on the morning of the 29th were primarily between 25 and 32 degrees countywide. The Hanceville site bottomed out at 25 degrees.

Frost/Freeze in LIMESTONE, ALABAMA
From 28-OCT-08 23:00:00 to 29-OCT-08 05:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Countywide temperatures dropped to below freezing for more than 5 hours.
Some of the lows reached were:  Athens - 30, Belle Mina - 25, Pryor Field - 29, and Sardis Springs - 26.

Frost/Freeze in LAUDERDALE, ALABAMA
From 29-OCT-08 04:00:00 to 29-OCT-08 09:00:00 (CST-6)
Reported by: COOP Observer

Countywide temperatures dropped to or below 32 degrees for more than 3 hours.  Some lows recorded that morning were:  Anderson - 26, Florence - 31.

Frost/Freeze in COLBERT, ALABAMA
From 28-OCT-08 22:24:00 to 29-OCT-08 08:24:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Temperatures across Colbert county dropped to the freezing mark or below for at least 3 hours. Low temperatures countywide on the morning of the 29th were primarily between 27 and 32 degrees. Both the Muscle Shoals Airport ASOS and 1 other nearly site bottomed out at 27 degrees.

Frost/Freeze in DEKALB, ALABAMA
From 28-OCT-08 22:24:00 to 29-OCT-08 08:24:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Temperatures across Dekalb county dropped to the freezing mark or below for at least 3 hours. Some locations such as the Valley Head were at or below 32 degrees Fahrenheit for at least 5 hours, where temperatures fell to 25 degrees.  Low temperatures countywide on the morning of the 29th were primarily between 25 and 30 degrees.

Frost/Freeze in MARSHALL, ALABAMA
From 29-OCT-08 05:00:00 to 29-OCT-08 09:00:00 (CST-6)
Reported by: COOP Observer

Countywide temperatures dropped to or below 32 degrees for at least 3 hours. Temperatures at the Union Grove site dropped to 31 degrees, while the site at Guntersville dropped to 32 degrees.

Frost/Freeze in MADISON, ALABAMA
From 28-OCT-08 22:24:00 to 29-OCT-08 08:24:00 (CST-6)
Reported by: COOP Observer

Temperatures across Madison county dropped to the freezing mark or below for at least 3 hours. Some locations such as the Meridianville Airport were at or below 32 degrees Fahrenheit for approximately 10 hours.  Low temperatures on the morning of the 29th were primarily between 27 and 32 degrees countywide.

Frost/Freeze in MORGAN, ALABAMA
From 28-OCT-08 22:24:00 to 29-OCT-08 08:24:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Temperatures across Morgan county dropped to the freezing mark or below for at least 4 hours. Some locations, such as the Florette, were at or below 32 degrees Fahrenheit for approximately 10 hours. This allowed temperatures to drop to 25 degrees Fahrenheit at Florette.  Low temperatures on the morning of the 29th were primarily between 25 and 30 degrees countywide.

Frost/Freeze in JACKSON, ALABAMA
From 28-OCT-08 22:24:00 to 29-OCT-08 08:24:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Temperatures across Jackson county dropped to the freezing mark or below for at least 3 hours. Some locations such as the Fort Payne AWOS were  at or below 32 degrees Fahrenheit for approximately 6 hours.  Low temperatures on the morning of the 29th were primarily between 25 and 30 degrees.