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The Day One outlook is valid until 6 am the next
day and consists of six individual threat maps. The following are
explanations of each map:
Thunderstorms: The definition of a severe thunderstorm is winds in
excess of 58 miles an hour (50 knots), hail 3/4 inch (dime size) or
larger, or tornadoes.
Flooding: Flash flooding refers to rapid flooding after or during a
heavy rainfall or dam break event. Flash flooding can occur in any low
lying or poor drainage area, as well as in small rivers and streams.
River flood is prolonged flooding due to rivers overflowing their
banks.
Non-Precipitation: The category includes excessive winds and
reduced visibility due to fog.
Winter Weather: The National Weather Service issues a Winter Storm
Warning for 3 inches of snow in 12 hours or 2 inches of snow with any
amount of measurable freezing rain (ice) accumulation in 12 hours. Also,
winter storm or ice storm warnings are issued for freezing rain (ice)
and/or sleet accumulations around one-quarter inch. Winter weather
Advisories are issued for amounts low than these values.
Wildfire Danger: Extreme Danger refers to dangerous fire conditions
that require a Red Flag warning or Fire Weather Watch. High Danger refers
to fuel and weather conditions that cause burning bans over a widespread
area.
Temperature Extremes: Dangerous temperature extremes that require
specific action to avoid personal injury.
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