Wednesday, April 6, 2011

Rock You like a Hurricane

An above average hurricane season still appears to be in the works for the Atlantic basin. Although this new forecast predicts a slight reduction in storms from the forecast made back in December due to slightly cooler Atlantic waters than anticipated, the number of named storms this season should still exceed the long-term average. Here's the full article by Dr. Phil Klotzbach and Dr. William Gray found on icecap.us:

We continue to foresee well above-average activity for the 2011 Atlantic hurricane season. Our seasonal forecast has been reduced slightly from early December, since there is a little uncertainty about ENSO and the maintenance of anomalously warm tropical Atlantic SST conditions. We continue to anticipate an above-average probability of United States and Caribbean major hurricane landfall.
Information obtained through March 2011 indicates that the 2011 Atlantic hurricane season will have significantly more activity than the average 1950-2000 season.
We estimate that 2011 will have about 9 hurricanes (average is 5.9), 16 named storms (average is 9.6), 80 named storm days (average is 49.1), 35 hurricane days (average is 24.5), 5 major (Category 3-4-5) hurricanes (average is 2.3) and 10 major hurricane days (average is 5.0).
The probability of U.S. major hurricane landfall is estimated to be about 140 percent of the long-period average. We expect Atlantic basin Net Tropical Cyclone (NTC) activity in 2011 to be approximately 175 percent of the long-term average.

We have decreased our seasonal forecast slightly from early December, due to anomalous warming in the eastern and central tropical Pacific and cooling in the tropical Atlantic.

This forecast is based on a new extended-range early April statistical prediction scheme that utilizes 29 years of past data. Analog predictors are also utilized. We expect current La Nina conditions to transition to near-neutral conditions during the heart of the hurricane season. Overall, conditions remain conducive for a very active hurricane season.
PROBABILITIES FOR AT LEAST ONE MAJOR (CATEGORY 3-4-5) HURRICANE LANDFALL ON EACH OF THE FOLLOWING COASTAL AREAS:
1) Entire U.S. coastline - 72% (average for last century is 52%)
2) U.S. East Coast Including Peninsula Florida - 48% (average for last century is 31%)
3) Gulf Coast from the Florida Panhandle westward to Brownsville - 47% (average for last century is 30%)
PROBABILITY FOR AT LEAST ONE MAJOR (CATEGORY 3-4-5) HURRICANE TRACKING INTO THE CARIBBEAN (10-20°N, 60-88°W)
1) 61% (average for last century is 42%



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