Different Weather Disturbances

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Tropical Storms and Hurricanes

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Presentation transcript:

Different Weather Disturbances

A. Tropical depression b. Tropical storm c. Typhoons Tropical Cyclones A. Tropical depression b. Tropical storm c. Typhoons Intertropical Convergence Zone Monsoons Northeast Monsoon Southwest Monsoon Cyclone Warning Public Storm Signal

Tropical Depression Once a group of thunderstorms has come together under the right atmospheric conditions for a long enough time, they may organize into a tropical depression. Winds near the center are constantly between 20 and 34 knots (23 - 39 mph).

Tropical Storm A tropical storm is an organized system of strong thunderstorms with a defined surface circulation and maximum sustained winds between 17 and 33 meters per second (34 to 63 knots, 39 to 73 mph, or 62 to 117 km/h). At this point, the distinctive cyclonic shape starts to develop, though an eye is usually not present.

Typhoon A Typhoon is a name used in east Asia for a Hurricane. It is a type of cyclone occurring in the western regions of the Pacific Ocean. A typhoon is similar to a hurricane in levels of destructiveness. The word typhoon comes from the Chinese term tai-fung meaning great wind.

Intertropical Convergence Zone The Intertropical Convergence Zone (ITCZ), known by sailors as The Doldrums, is the area encircling the earth near the equator where winds originating in the northern and southern hemispheres come together. The ITCZ was originally identified from the 1920s to the 1940s as the "Intertropical Front" (ITF), but after the recognition in the 1940s and 1950s of the significance of wind field convergence in tropical weather production, the term "ITCZ" was then applied

Monsoons Monsoon is traditionally defined as a seasonal reversing wind accompanied by corresponding changes in precipitation but is now used to describe seasonal changes in atmospheric circulation and precipitation associated with the asymmetric heating of land and sea. Usually, the term monsoon is used to refer to the rainy phase of a seasonally- changing pattern, although technically there is also a dry phase.

Northeast Monsoon Southwest Monsoon

Cyclone Warning Tropical Cyclone Alert Weather Advisory First Stage Second Stage Tropical Cyclone Alert Third Stage

Public Storm Signal PSWS #1 - Tropical cyclone winds of 30 km/h (19 mph) to 60 km/h (37 mph) are expected within the next 36 hours. (Note: If a tropical cyclone forms very close to the area, then a shorter lead time is seen on the warning bulletin.) PSWS #2 - Tropical cyclone winds of 60 km/h (37 mph) to 100 km/h (62 mph) are expected within the next 24 hours PSWS #3 - Tropical cyclone winds of 100 km/h (62 mph) to 185 km/h (115 mph) are expected within the next 18 hours. PSWS #4 - Tropical cyclone winds of greater than 185 km/h (115 mph) are expected within 12 hours.