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Marine Resource 2016

High hurricane activity predicted for the Atlantic in 2013

by William Gray and Phil Klotzbach/Sail-World on 17 Apr 2013
Hurricane Sandy damage .. .
As the hurricane season approaches for the North Atlantic leisure sailors, marinas and yacht clubs, already left bruised by the last season's hurricanes, will be watching the forecasts closely. Colorado State University, in their 30th year of forecasts, has no good news for them, this week predicting 18 named storms, nine hurricanes and no less than four major (more than 95kt winds) hurricanes.

Their prediction of such and above-average 2013 Atlantic basin hurricane season is due primarily to anomalous warming of the tropical Atlantic and expected lack of an El Nino event.

The team calls for 18 named storms during the hurricane season, which falls between June 1 and Nov. 30. Nine of those are expected to become hurricanes and four of those major hurricanes (Saffir/Simpson category 3-4-5).


'The tropical Atlantic has anomalously warmed over the past several months, and it appears that the chances of an El Niño event this summer and fall are unlikely,' said Phil Klotzbach, who authors the forecast with William Gray of the CSU Tropical Meteorology Project. 'Typically, El Nino is associated with stronger vertical shear across the tropical Atlantic, creating conditions less conducive for storm formation.'

The team’s annual predictions are intended to provide a best estimate of activity to be experienced during the upcoming season, not an exact measure.

The forecasts are based on the premise that global oceanic and atmospheric conditions - such as El Nino, Atlantic basin sea surface temperatures and sea level pressures - that preceded active or inactive hurricane seasons in the past provide meaningful information about similar conditions that will likely occur in the current year.

'All vulnerable coastal residents should make the same hurricane preparations every year, regardless of how active or inactive the seasonal forecast is,' Klotzbach said. 'It takes only one landfall event near you to make this an active season.'

Five hurricane seasons since 1900 exhibited oceanic and atmospheric characteristics most similar to those observed in February-March 2013: 1915, 1952, 1966, 1996 and 2004. Four out of the five years had above-average hurricane activity.

The team predicts that tropical cyclone activity in 2013 will be about 175 percent of the average season. By comparison, 2012 witnessed tropical cyclone activity that was 131 percent of the average season.



The hurricane forecast team's probabilities for a major hurricane making landfall on U.S. soil in 2013 are:

• Entire U.S. coastline – 72 percent (average for last century is 52 percent)

• U.S. East Coast Including Peninsula Florida – 48 percent (average for last century is 31 percent)

• Gulf Coast from the Florida Panhandle westward to Brownsville – 47 percent (average for last century is 30 percent)

• Caribbean – 61 percent (average for last century is 42 percent)

Probabilities of tropical storm-force, hurricane-force and major hurricane-force winds occurring at specific locations along the U.S. East and Gulf Coasts are listed on the forecast team's Landfall Probability website at http://www.e-transit.org/hurricane. The site provides U.S. landfall probabilities for all coastal states as well as 11 regions and 205 individual counties along the U.S. coastline from Brownsville, Texas, to Eastport, Maine. Landfall probabilities for regions and counties are adjusted based on the current climate and its projected effects on the upcoming hurricane season. Probabilities are also available for the Caribbean and Central America. Klotzbach and Gray update the site regularly with assistance from the GeoGraphics Laboratory at Bridgewater State University in Massachusetts.

The team will issue forecast updates on June 3 and August 2.

CSU RESEARCH TEAM EXTENDED RANGE ATLANTIC BASIN HURRICANE FORECAST FOR 2013
-Released April 10, 2013-
Tropical Cyclone Parameters Extended Range
(1981-2010 Climatological Median Forecast for 2013
in parentheses)
Named Storms (12)* 18
Named Storm Days (60.1) 95
Hurricanes (6.5) 9
Hurricane Days (21.3) 40
Major Hurricanes (2.0) 4
Major Hurricane Days (3.9) 9
Accumulated Cyclone Energy (92) 165
Net Tropical Cyclone Activity (103%) 175
* Numbers in ( ) represent medians based on 1981-2010 data.

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