WW2010
University of Illinois

WW2010
 
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> online guides
 
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Online Guides
 
  introduction
 
> meteorology
 
  remote sensing
 
  reading maps
 
  projects, activities

Meteorology
 
  introduction
 
  air masses, fronts
 
  clouds, precipitation
 
  el nino
 
  forces, winds
 
> hurricanes
 
  hydrologic cycle
 
  light, optics
 
  midlatitude cyclones
 
  severe storms
 
  weather forecasting

Hurricanes
 
  introduction
 
> definition
 
  how they're named
 
  movement
 
  convective processes
 
  development stages
 
  destruction

User Interface
 
  graphics
> text

NOTE: We've guessed that you're not using a client that supports colored tables and have tried to compensate. Low graphics mode looks much better on clients that do... we recommend switching to Netscape 3.0 or Microsoft Internet Explorer.
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Hurricanes
a tropical cyclone with winds > 64 knots

Hurricanes are tropical cyclones with winds that exceed 64 knots (74 mi/hr) and blow counterclockwise about their centers in the Northern hemisphere, (clockwise in the Southern hemisphere).


[Image: legend for above diagram ] Areas of favorable development
Hurricanes are born over the warm waters of the tropical oceans, where humid air and converging winds fuel convective processes responsible for developing hurricanes.

Hurricane season typically extends from June through November, when water temperatures in these regions are relatively high (greater than 26.5 C). Most hurricanes occur in late summer and early fall, i.e., August and September. Hurricanes are larger than thunderstorms and tornadoes but smaller than mid-latitude cyclones The primary components of a hurricane include:

[Image: (50K)] The Eye:
A region 20-50 km in diameter found at the center where skies are often clear, winds are light, and the storm's lowest pressure readings are obtained.

Eye Wall:
A ring of cumulonimbus clouds that swirl around the eye. The heaviest precipitation and strongest winds are found here.

Spiral Rainbands:
Bands of heavy convective showers that spiral inward toward the storm's center.

There is an average of 84 tropical storms and 45 hurricanes / typhoons globally per year. Roughly nine named storms develop per year in the tropical Atlantic and Gulf of Mexico, six of which typically become hurricanes; two of which become intense hurricanes (sustained winds exceeding 130 mph or 209 km/hr).



introduction
Terms for using data resources. CD-ROM available.
Credits and Acknowledgments for WW2010.
Department of Atmospheric Sciences (DAS) at
the University of Illinois at Urbana-Champaign.

how they're named