Weather alerts are provided by local, state and national authorities and the media when threatening climate conditions arise. Meteorologists are trained professionals equipped to analyze natural indicators of weather conditions that may be threatening and advise us to seek safety when necessary. In the event of severe weather predictions, always stay tuned to your radio or television and become familiar with the warning signals. While it's good to be able to judge cloud formations and other natural signs, don't assume you will have time to assess weather conditions and to act properly in the event of bad weather.
FLASH FLOOD WATCH - A flash flood watch means there may be flooding. Stay alert and watch for thunderstorms. Keep an eye on rivers, creeks and streams. If they rise, don't wait; get to high ground fast.
FLASH FLOOD WARNING: A flash flood warning means there is flooding. Act at once. Move to a safe area on high ground.
HURRICANE WATCH – Means a hurricane may hit your area.
HURRICANE WARNING – Means a hurricane is headed for your areas. You may be told to move to a shelter or evacuate the area. Do so immediately.
Category 1: Winds of 74 to 95 miles per hour. Damage primarily to shrubbery, trees, foliage and mobile homes. No real wind damage to other structures. Some damage to poorly constructed signs. Low-lying coastal roads inundated, minor pier damage, some small craft in exposed anchorage torn from moorings.
Category 2: Winds of 96 to 110 miles per hour. Considerable damage to shrubbery and tree foliage; some trees blown down. Major damage to exposed mobile homes. Extensive damage too poorly constructed signs. Some damage to roofing materials of buildings: some window and door damage. No major wind damage to buildings. Considerable damage could occur to piers. Marinas flooded. Small craft may be torn from moorings.
Category 3: Winds of 111 to 130 miles per hour. Foliage torn from trees, and large trees blown down. Practically all poorly constructed signs blown down. Some damage to roofing materials of buildings; some window and door damage and some structural damage to small buildings. Mobile homes destroyed. Serious flooding at coast and many smaller structures near coast destroyed; larger structures near coast damaged by bettering waves and floating debris.
Category 4: Winds of 131 to 155 miles per hour. Many shrubs and trees are blown down and most street signs are damaged. Extensive damage to roofing materials, windows and doors. Complete failure of roofs on many small residences. Complete destruction of mobile homes. Major damage to lower floors of structures near shore due to flooding and battering by waves and floating debris. Major erosion of beaches.
Category 5: Winds greater than 155 miles per hour. Shrubs and trees are blown down; considerable damage to roofs of buildings and all signs are damaged or destroyed. Severe and extensive damage to windows and doors, including shattering of glass. Complete failure of roofs on many residences and industrial buildings. Some complete building failures. Small buildings overturned or blown away. Complete destruction of mobile homes.
TORNADO WATCH – Indicates that weather conditions may cause tornadoes or severe thunderstorms to develop in or near the watch area. A watch does not mean a tornado has been sighted
TORNADO WARNING – Means that a tornado has actually been sighted or indicated by radar and residents should take shelter.
TORNADO CATEGORIES: Tornadoes are categorized according to the damage they cause, using what is known as the Enhanced Fujita Tornado Intensity Scale.
EF-0 Winds at 65 to 85 miles per hour. EF-3 Winds at 136 to 165 miles per hour
EF-1 Winds at 86 to 110 miles per hour. EF-4 Winds at 166 to 200 miles per hour
EF-2 Winds at 111 to 135 miles per hour. EF-5 Winds over 200 miles per hour.
WINTER WEATHER ADVISORY:
When a significant winter storm or hazardous winter weather is occurring, imminent.
WINTER STORM WATCH: Significant winter weather (i.e., heavy snow, heavy sleet, significant freezing rain, or a combination of events) is expected, but not imminent for the watch area; provides 12- to 36-hour notice of the possibility of severe winter weather.
WINTER STORM WARNING: A significant winter storm or hazardous winter weather is occurring, imminent, or likely and is a threat to life and property.
BLIZZARD WARNING: Winds that are at least 35 mph or greater, blowing snow that will frequently reduce visibility to 1/4 mile or less for at least three hours, and dangerous wind chills are expected in the warning area.
WIND CHILL INDEX: The calculation of temperature that takes into consideration the effects of wind and temperature on the human body. This is not the actual air temperature, but what it feels like to the average person. This wind chill chart shows the difference between actual air temperature and perceived temperature, and the amount of time until frostbite occurs.
Source: Alabama Emergency Management Agency and the ational Weather Service.
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