hurricane advisories

Wind Speed
Knots to MPH
Millibars to Inches Hg
Tropical Weather Terms

Tropical Cyclone

A Tropical Cyclone is a low pressure system not associated with a cold front, that develops over Tropical and sometimes sub-tropical waters and The Tropical Cyclone will have a organized circulation

Tropical Depression

A tropical depression is a tropical cyclone in which the maximum sustained surface winds(1 minute average) are 38 miles per hour (33 knots) or less

Tropical Storm

A Tropical Storm is a tropical cyclone in which the maximum sustained surface winds range from 39 to 73 miles per hour (34 to 63 knots)


A Hurricane is a Tropical Cyclone in which the maximum sustained surface winds are 74 miles per hour or greater (64 knots or greater)

Tropical Storm Watch

A Tropical storm watch is issued when tropical storm conditions pose a possible threat to a specified coastal area within 36 hours.

Tropical Storm Warning

A Tropical Storm warning is issued when tropical storm conditions are expected in a specified coastal area within 24 hours or less

Hurricane Watch

A Hurricane watch is issued for a specified coastal area when a hurricane or an incipient hurricane condition is a possible threat within 36 hours

Hurricane Warning

A Hurricane Warning is issued when sustained winds of 74 mph or higher caused by a hurricane are expected in a specified area in 24 hours or less

Hurricane Local Statement

A statement prepared by National Weather Service forecast offices giving specific details for its County Warning Area on weather conditions evacuation decisions and other precautions to protect life and property

Public Advisories

Tropical cyclone advisories contain information issued by the Tropical Prediction Center describing all tropical cyclone watches and warnings in effect and details concerning tropical cyclone locations and intensity


A term you will hear in advisories and reports to indicate that a tropical cyclone has lost its tropical characteristics. The term implies both poleward displacement of the cyclone and the conversion of the cyclone's primary energy source from the release of latent heat of condensation to baroclinic processes It is important to note that cyclones can become extratropical and still retain winds of hurricane or tropical storm force

Fujiwhara Effect

The tendency of two nearby tropical cyclones to rotate cyclonically about each other

Storm Tide

The actual level of sea water resulting from the astronomic tide combined with the storm surge

Storm Surge

An abnormal rise in sea level accompanying a hurricane or other intense storm and whose height is the difference between the observed level of the sea surface and the level that would have occurred in the absence of the cyclone. Storm surge is usually estimated by subtracting the normal or astronomic high tide from the observed storm tide

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