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Wednesday, April 27, 2011

Alabama Weather

State is classified as humid subtropical (Cfa) under the Koppen Climate Classification. The average annual temperature is 64 °F (18 °C). Temperatures tend to be warmer in the southern part of the state with its proximity to the Gulf of Mexico, while the northern parts of the state, especially in the Appalachian Mountains in the northeast, tend to be slightly cooler. Generally, Alabama has very hot summers and mild winters with copious precipitation throughout the year. Alabama receives an average of 56 inches (1,400 mm) of rainfall annually and enjoys a lengthy growing season of up to 300 days in the southern part of the state.
Summers in Alabama are among the hottest in the United States, with high temperatures averaging over 90 °F (32 °C) throughout the summer in some parts of the state. Alabama is also prone to tropical storms and even hurricanes. Areas of the state far away from the Gulf are not immune to the effects of the storms, which often dump tremendous amounts of rain as they move inland and weaken.
Though winters in the state are usually mild, nightly freezing occurs frequently in the North Alabama region. This is shown in this picture taken at the Old State Bank in Decatur during early January.
South Alabama reports many thunderstorms. The Gulf Coast, around Mobile Bay, averages between 70 and 80 days per year with thunder reported. This activity decreases somewhat further north in the state, but even the far north of the state reports thunder on about 60 days per year. Occasionally, thunderstorms are severe with frequent lightning and large hail – the central and northern parts of the state are most vulnerable to this type of storm. Alabama ranks seventh in the number of deaths from lightning and ninth in the number of deaths from lightning strikes per capita.[42] Sometimes tornadoes occur – these are common throughout the state, although the peak season for tornadoes varies from the northern to southern parts of the state. Alabama, along with Kansas, has the most reported EF5 tornadoes of any state – according to statistics from the National Climatic Data Center for the period January 1, 1950, to October 31, 2006. An F5 tornado is the most powerful of its kind.Several long – tracked F5 tornadoes have contributed to Alabama reporting more tornado fatalities than any other state except for Texas and Mississippi. The Super Outbreak in March 1974 badly affected Alabama. The northern part of the state – along the Tennessee Valley – is one of the areas in the U.S.most vulnerable to violent tornadoes. The area of Alabama and Mississippi most affected by tornadoes is sometimes referred to as Dixie Alley, as distinct from the Tornado Alley of the Southern Plains. Alabama is one of the few places in the world that has a secondary tornado season (November and December) along with the spring severe weather season.
Winters are generally mild in Alabama, as they are throughout most of the southeastern United States, with average January low temperatures around 40 °F (4 °C) in Mobile and around 32 °F (0 °C) in Birmingham. Although snow is a rare event in much of Alabama, areas of the state north of Montgomery may receive a dusting of snow a few times every winter, with an occasional moderately heavy snowfall every few years. Historic snowfall events include New Year's Eve 1963 snowstorm and the 1993 Storm of the Century. The annual average snowfall for the Birmingham area is 2 inches (51 mm) per year. In the southern Gulf coast, snowfall is less frequent, sometimes going several years without any snowfall.

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