![]() ![]() ![]() These are issued on, or after March 20 in spring, and prior to November 20 in autumn. Issued when, during the next 24 hours, there is a high degree of confidence (at least 65%) that temperatures will drop to 32☏ or lower. In autumn, the issuance of Freeze Watches will be discontinued prior to November 20 if temperatures fall below 28☏ over a wide area. Issued when, during the next 12 to 48 hours, there is at least a moderate degree of confidence (50 percent – 70 percent) that temperatures will drop to 32☏ or lower. In autumn, the issuance of Frost Advisories will be discontinued prior to November 20 if temperatures fall below 28☏ over a wide area. Issued when, within the next 24 hours, there is a high probability (at least 80 percent) of significant frost. In autumn, the issuance of Frost Outlooks will be discontinued prior to November 20 if temperatures fall below 28☏ over a wide area. Issued when, within the next 24 to 48 hours, there is a moderate probability (50percent – 70 percent) of significant frost. Blizzard conditions consist of sustained wind speeds (or gusts) of at least 35 mph, and considerable falling or blowing snow causing a reduction of visibilities to less than 1/4 mile for at least 3 hours. Issued when there is at least an 80 percent chance that wind and snow will combine to produce blizzard conditions within the next 24 hours. ![]() Blizzard conditions consist of sustained wind speeds (or gusts) of at least 35 mph and considerable falling or blowing snow causing a reduction of visibilities to less than 1/4 mile for at least 3 hours. Issued when there is at least a 50 percent chance for blizzard conditions within the next 12 to 48 hours. Issued when there is at least an 80 percent chance that freezing rain will result in the accumulation of at least 1/4 inch of ice within the next 24 hours. Snow accumulations must be at least 2 inches (except 3 inches in the Northeast Georgia Mountains) within a 12-hour period, or at least 4 inches in a 24-hour period. Winter storm conditions include an accumulation of at least a half-inch of sleet, and/or a significant accumulation (1/4 inch or more) of ice due to freezing rain, and/or heavy snow accumulation. Issued when there is at least an 80 percent chance for winter storm conditions occurring within the next 24 hours. Issued when there is at least a 50 percent chance for winter storm conditions occurring in the next 12 to 48 hours. Issued when, within the next 24 hours, there is a high probability of enough snow, sleet, or ice to cause inconvenience, but not enough to warrant a warning. ![]()
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