Post-tropical cyclones can continue producing heavy rains and high winds. They are asymmetrical and have a cold core.Ī post-tropical cyclone is a former tropical cyclone that no longer possesses sufficient characteristics to be considered a tropical cyclone, such as convection at its center. Extra-tropical cyclones are low-pressure systems generally associated with cold fronts, warm fronts, and occluded fronts. However, the term refers to cyclones that get their energy from the horizontal temperature contrasts that exist in the atmosphere.
The “ extra-tropical” in extra-tropical cyclone refers to the latitudes 35°N to 65°N (or °S). Sub-tropical cyclones can transform into tropical or extra-tropical storms depending on conditions. They are either asymmetrical with a warm core or symmetrical with a cold core. However, the term refers to cyclones whose characteristics are neither fully tropical nor extratropical. The “ sub-tropical” in sub-tropical cyclone refers to the latitudes 25°N to 35°N (or °S). TCP-31, World Meteorological Organization Geneva, Switzerland (1993): “Global Overview” – Chapter 1″ Global Guide to Tropical Cyclone Forecasting, WMO/TC-No. (1993): “Ready Reckoner” – Chapter 9, Global Guide to Tropical Cyclone Forecasting, WMO/TC-No. Tropical Disturbances -> Tropical Depressions -> Tropical Storms -> Hurricane or Typhoon. Once winds exceed 74 mph (64 knots, 33 meters per second) it will be designated a hurricane (in the Atlantic or East Pacific Oceans) or a typhoon (in the northern West Pacific). When winds exceed that threshold, it becomes a t ropical storm and is given a name.
If it has a closed circulation but under 39 mph (34 knots, or 17 meters per second) maximum sustained surface winds, it is called a tropical depression. If it lacks a closed circulation it is called a tropical disturbance. Tropical cyclones derive their energy from vertical temperature differences, are symmetrical, and have a warm core. A tropical cyclone is a generic term for a low-pressure system that formed over tropical waters (25°S to 25°N) with thunderstorm activity near the center of its closed, cyclonic winds.
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