One of the driving factors in determining the magnitude of a hurricane season is forecasting the phase of a naturally occurring climate cycle across the waters of the equatorial Pacific Ocean. The phase changes over the equatorial Pacific Ocean are known as La Nina and El Nino. A cooler-than-average phase in the equatorial Pacific is referred to as "La Nina" while a warmer-than-average phase is called "El Nino."
Trends in the Atlantic Hurricane Season from year to year can be traced back to the La Nina and El Nino phases over the Pacific. Through extensive research, Dr. William Gray of Colorado State University discovered that La Nina cycles produce more Atlantic hurricanes while El Nino cycles produce fewer Atlantic hurricanes.
One of the main reasons this conclusion was drawn is that the wind shear is typically lower across the Atlantic during La Nina than in El Nino years. Lower levels of wind shear allow tropical waves to organize more frequently and develop into tropical cyclones and hurricanes. In El Nino years, there is increased wind shear across the Atlantic Basin which will tend to prevent tropical waves from organizing into cyclones and hurricanes.
Another correlation that can be drawn between La Nina and El Nino is the number of hurricanes that threaten the Caribbean and the United States. As one might expect, research shows that La Nina years feature an increased threat of hurricanes striking land in the Caribbean or the United States than years with an El Nino.
Why can different types of precipitation be seen on Earth while temperatures remain constant?
Dangerous flash flooding is captured as an arroyo becomes filled with water in Carson Valley, Nevada.
The RealFeel Temperature uses an equation to determine how it actually feels outside.
Knowing what the different advisories, watches, and warnings mean will lead to more informed decision making when a winter storm threatens a particular area.
How can you determine if and when the ice is thick enough for safely going out on?
Seeking shelter in the event of a tornado could save your life, but is there really any safe place to hide?
Driving on a 90-degree angle away from the tornado is a good strategy to follow in order to distance yourself from the tornado.
Supercell thunderstorms have been responsible for major tornadoes that have demolished parts of the U.S.
After a cold, clear winter night without much wind, the ground and nearby tree branches may be covered by tiny, white ice crystals.
A major cause of post-snow flooding are ice jams in waterways.
Early-season snows: Jay Peak 6 inches Warren 5 inches
New England (1990)
Remains of Tropical Storms Klaus and Marco brought torrential rains and flooding. Parts of Connecticut had 6 inches of rain or more. Stafford, CT, had 4.20 inches.
East Coast (1846)
Great Hurricane of 1846. Track: Cuba, Key West, FL; GA; Carolinas; Chesapeake Bay; PA - major damage all areas (Similar to Hazel in 1954). Lashed the Delaware River "into a perfect fury and its roar would have drowned out the thunder of the Niagara.