Fujiwhara effect

The Fujiwhara effect (English as Fujiwhara interaction described ) is a kind of mutual influence of two hurricanes. In this system both seem to circle each other.

If the two cyclones approach one another, begin the two centers of the storms to rotate about a point between the two systems. The two vortices attract each other and move in a spiral path around this pivot point. Ultimately, it may lead to a merger. If the two storm systems are of different sizes, the larger cyclone dominates the mutual influence and the small storm revolves around the larger ones.

The effect is often used for movements of tropical cyclones, although the merger at the end is a rather unusual event. This effect is referred to in general when the two storm systems are closer than about 1450 km to each other and reach at least the strength of a tropical storm.

The effect is named after the Japanese meteorologists Sakuhei Fujiwhara (藤原 咲 平) (1884 - 1950), who first described it in 1921 in an essay on the movement of air vortices over water.

Examples

Some examples can be found in the busy Atlantic hurricane season of 1995. At the height of the season, the Fujiwhara effect showed first when meeting the Hurricanes Humberto and Iris. Iris then came under the influence of a third storm, Karen, the iris first circled and finally merged with Iris. During the typhoon season 1994 Typhoons Pat and Ruth completed a full orbit around their centroid before they fell together into a single cyclone. 1997 Supertaifune Ivan and Joan were a couple of Supertaifunen whose course was determined by the Fujiwhara effect. Ivan was drawn to a westerly course and Joan on a northerly course.

In 2005, Tropical Storm Alpha was absorbed by Hurricane Wilma in the North Atlantic, as well as Lidia was absorbed by Max. During the typhoon season of 2007, the Fujiwhara effect in the South China Sea caused to a reversal of the course of the typhoon Hagibis response to Typhoon Mitag, which was located northeast of the Philippines.

Even the distributors east of the Philippines Typhoon Melor brought during the typhoon season 2009 Typhoon Parma, the Philippines had already crossed to a reversal of the direction of pull. Typhoon Parma crossed the northern part of Luzon for a second time, from west to east. Typhoon Melor moved Meanwhile to the north, thus Typhoon Parma Typhoon Melor the influence of withdrew. Melor took so its original direction of pull to the west again and crossed Luzon in the result for the third time.

Swell

  • USA Today. " Fujiwhara effect Describes a stormy waltz ". ( Accessed on 25 January 2008, English)
  • Joint Typhoon Warning Center. Joint Typhoon Warning Center -. Typhoon Pat 1994 ( PDF retrieved on 25 January 2008, English)
  • Edward N. Rappaport NOAA Hurricane Research Division. "Hurricane Iris Preliminary Report"
  • National Hurricane Center. " Tropical Cyclone Report Lisa" ( 2004). ( Accessed on 25 January 2008, English)
  • Climatology
  • Tropical Cyclone
  • Meteorological concept
1995 Atlantic hurricane season Tropical Storm Alpha (2005) 2009 Pacific typhoon season
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