Wintry Mix across Central Alabama
January 31, 2007
PUBLIC INFORMATION STATEMENT NATIONAL WEATHER SERVICE BIRMINGHAM AL 900 PM CST THU FEB 1 2007
...A wintry mix occurred Wednesday night across Central Alabama...
A stationary front along the northern Gulf Coast was the boundary
between a warm tropical environment in the gulf and a dry modified
arctic airmass located over Central Alabama. A weak upper level
disturbance induced a low pressure area along the front...which
lifted moisture up and over the cold air. This resulted in mixed
wintry precipitation across Central Alabama Wednesday night.
As with many Central Alabama winter events...temperatures from the
ground up to several thousand feet hovered ever so close to that
freezing mark. Subtle differences in this temperature profile
produced the mixed wintry precipitation...although a majority of this
event was characterized by rain.
Here is an unofficial summary of the precipitation types and amounts
from Wednesday night/Thursday morning.
Tallapoosa...Chambers...Southern Jefferson...and Southern Talladega
Counties...These counties experienced mainly a rain event...but
sleet was mixed in from time to time. The sleet was generally light
and melted on contact with the ground. No sleet accumulations
were reported. Luckily the temperature rose above that freezing mark
because rainfall amounts averaged one to two inches overnight.
Fayette...Walker and Northern Jefferson Counties...These areas
received a mixture of rain and sleet which transitioned to all rain
overnight. Some brief and minor accumulations of sleet were reported.
All minor accumulations occurred on exposed surfaces such as
vehicles and generally lasted an hour or less. Estimated rainfall
for these areas 0.50 to 1.25 inches.
Lamar...Marion...and Winston Counties...A mixture of rain...
freezing rain...and sleet was reported. Minor accumulations of sleet
and freezing rain occurred on some exposed surfaces such as trees and
bridges. These ice accumulations lasted only a few hours before
melting. Overnight rainfall totals were 0.50 to 1 inch.
St. Clair...Northern Talladega...and Clay Counties...These
Counties received a mixture of rain...freezing rain...sleet...and a
few snow flakes. Some light accumulations occurred at the highest
elevations...But overall little to no accumulations occurred in this
Etowah...Cherokee...Calhoun...Cleburne...and Randolph Counties...A
complete winter mix was experienced in places as snow...freezing
rain...sleet...and rain were reported. Light accumulations of
sleet...freezing rain and snow were observed. The accumulations were
1/2 of an inch or less and were generally on exposed surfaces such
as trees and grass or at higher elevations. The accumulations only
lasted a few hours as the precipitation transitioned to all rain by
just after sunrise.