lotus

previous page: 37 What are those track and intensity models that the Atlantic forecasters are talking about in the tropical storm and hurricane Discussions?
  
page up: Storms FAQ
  
next page: 39 How does El Nino-Southern Oscillation affect tropical cyclone activity around the globe?

38 What is the annual cycle of occurrence seen in each basin?




Description

This article is from the Storms FAQ, by Chris Landsea landsea@aoml.noaa.gov with numerous contributions by others.

38 What is the annual cycle of occurrence seen in each basin?

While the Atlantic hurricane season is "officially" from 1 June to
30 November, the Atlantic basin shows a very peaked season with 78% of the
tropical storm days, 87% of the minor (Saffir-Simpson Scale categories
1 and 2 - see subject D1) hurricane days, and 96% of the intense (Saffir-
Simpson categories 3, 4 and 5) hurricane days occuring in August through
October (Landsea 1993). Peak activity is in early to mid September. Once
in a few years there may be a tropical cyclone occurring "out of season" -
primarily in May or December.

The Northeast Pacific basin has a broader peak with activity beginning
in late May or early June and going until late October or early November
with a peak in storminess in late August/early September.

The Northwest Pacific basin has tropical cyclones occurring all year
round regularly though there is a distinct minimum in February and the
first half of March. The main season goes from July to November with a
peak in late August/early September.

The North Indian basin has a double peak of activity in May and
November though tropical cyclones are seen from April to December. The
severe cyclonic storms (>33 m/s winds) occur almost exclusively from April
to June and late September to early December.

The Southwest Indian and Australian/Southeast Indian basins have very
similar annual cycles with tropical cyclones beginning in late October/
early November, reaching a double peak in activity - one in mid-January
and one in mid-February to early March, and then ending in May. The
Australian/Southeast Indian basin February lull in activity is a bit more
pronounced than the Southwest Indian basin's lull.

The Australian/Southwest Pacific basin begin with tropical cyclone
activity in late October/early November, reaches a single peak in late
February/early March, and then fades out in early May.

Globally, September is the most active month and May is the least
active month. (Neumann 1993)

 

Continue to:













TOP
previous page: 37 What are those track and intensity models that the Atlantic forecasters are talking about in the tropical storm and hurricane Discussions?
  
page up: Storms FAQ
  
next page: 39 How does El Nino-Southern Oscillation affect tropical cyclone activity around the globe?