Cold high pressure in place over the Tennessee Valley and the northeastern US produced clear skies optimal for radiational cooling.  This allowed temperatures to drop into the upper 20s to lower 30s across the Huntsville forecast area. The coldest temperatures where seen in sheltered valleys and rural locations.

Frost/Freeze in FRANKLIN, ALABAMA
From 19-OCT-09 02:00:00 to 19-OCT-09 06:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Temperatures across much of Franklin county dropped into the upper 20s or lower 30s.
Freezing temperatures of 32 degrees or below occurred for 1 to 3 hours in several locations.

Frost/Freeze in COLBERT, ALABAMA
From 19-OCT-09 02:00:00 to 19-OCT-09 06:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Temperatures across much of Colbert county dropped into the lower 30s, with many locations remaining at 32 degrees or lower for 1 to 3 hours.

Frost/Freeze in LAUDERDALE, ALABAMA
From 19-OCT-09 02:00:00 to 19-OCT-09 06:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Temperatures dropped to around 32 degrees across portions of Lauderdale county. The temperature remained at or below 32 degrees for 1 to 3 hours.

Frost/Freeze in LAWRENCE, ALABAMA
From 19-OCT-09 02:00:00 to 19-OCT-09 06:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Temperatures for portions of Lawrence county dropped to 32 degrees or below for 1 to 3 hours.

Frost/Freeze in MADISON, ALABAMA
From 19-OCT-09 02:00:00 to 19-OCT-09 06:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Temperatures dropped into the upper 20 to lower 30 degree range across Madison county for 1 to 3 hours.

Frost/Freeze in JACKSON, ALABAMA
From 19-OCT-09 02:00:00 to 19-OCT-09 06:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Temperatures fell into the upper 20s and lower 30s across Jackson county for 1 to 3 hours.

Frost/Freeze in MORGAN, ALABAMA
From 19-OCT-09 02:00:00 to 19-OCT-09 05:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Temperatures across much of Morgan county dipped into the upper 20s or lower 30s for 1 to 3 hours.  The Decatur Airport experienced temperatures between 29 and 32 degrees between 2:53 am and 05:53 am.

Frost/Freeze in MARSHALL, ALABAMA
From 19-OCT-09 03:00:00 to 19-OCT-09 06:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Temperatures across Marshall county dropped into the lower to mid 30s.  Higher elevations, such as Sand Mountain, dropped to between 30 and 32 degrees for 1-3 hours.

Frost/Freeze in LIMESTONE, ALABAMA
From 19-OCT-09 02:00:00 to 19-OCT-09 06:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Temperatures dropped to 32 degrees for 1 to 3 hours across much of Limestone county.

Frost/Freeze in DEKALB, ALABAMA
From 19-OCT-09 02:00:00 to 19-OCT-09 06:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Temperatures across Dekalb county dropped into the lower 30s.  Temperatures were 32 degrees or below for around 3 hours.

Frost/Freeze in CULLMAN, ALABAMA
From 19-OCT-09 02:00:00 to 19-OCT-09 06:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Temperatures across much of Cullman county fell into the lower 30s. Temperatures remained 32 degrees or lower for 1 to 3 hours.