Tropical Wave:

A trough of low pressure in the trade-wind easterlies.

Tropical Disturbance:

A moving area of thunderstorms in the tropics that maintains its identity for 24 hours or more. A common phenomenon in the tropics.

Tropical Storm:

A tropical cyclone in which the maximum sustained surface wind ranges from 39-73 mph (34-63 knots) inclusive.

Hurricane:

A tropical cyclone in which the maximum sustained surface wind is 74 mph (64 knots) or greater.

Small Craft Cautionary Statements:

When a tropical cyclone threatens a coastal area, small craft operators are advised to remain in port or not to venture into the open sea.

Tropical Storm Watch:

Is issued for a coastal area when there is the threat of tropical storm conditions within 36 hours.

Tropical Storm Warning:

A warning for tropical storm conditions, including sustained winds within the range of 39 to 73 mph (34 to 63 knots) which are expected in a specified coastal area within 24 hours or less.

Hurricane Watch:

An announcement that hurricane conditions pose a possible threat to a specified coastal area within 36 hours.

Hurricane Warning:

A warning that sustained winds of 74 mph (64 knots) or higher are expected in a specified coastal area within 24 hours or less.

Storm Surge

An abnormal rise of the sea shore as the result, primarily, of the winds in the storm.

Flash Flood Watch:

Flash flood conditions are possible within the designated watch area - BE ALERT.

Flash Flood Warning:

Flash flooding has been reported or is imminent - TAKE IMMEDIATE ACTION.