NOAA: 2007 Atlantic Hurricane Season Outlook
NOAA is predicting a very high likelihood (85% chance) of an above-normal 2007 Atlantic hurricane season, a 10% chance of a near-normal season, and only a 5% chance of a below-normal season, according to a consensus of scientists at the National Oceanic and Atmospheric Administration (NOAA) Climate Prediction Center, National Hurricane Center, Hurricane Research Division, and Hydrometeorological Prediction Center.
The outlook calls for an even higher probability of an above-normal season than was predicted in May (75%), and reiterates the expectation for a sharp increase in activity from the near-normal season observed last year. The 2007 season is expected to become the tenth above-normal season since the current active hurricane era began twelve years ago (in 1995). See NOAA’s definitions of above-, near-, and below-normal seasons.
The 2007 outlook calls for a likely range of 13-16 named storms, 7-9 hurricanes, and 3-5 major hurricanes. The likely range of the ACE index is 140%-200% of the median. These ranges are slightly tighter than those predicted in May (13-17 named storms, 7-10 hurricanes, 3-5 major hurricanes, and an ACE range of 125%-210%). The tighter ranges reflect not only an increased confidence for an above normal season, but also a reduced likelihood of seeing as many as 10 hurricanes and 17 named storms.
The prediction for an above-normal 2007 hurricane season reflects the combination of two main climate factors: 1) the continuation of conditions that have been conducive to above-normal Atlantic hurricane seasons since 1995, and 2) the continued La Niña-like pattern of tropical convection. In addition, temperatures in the western tropical Atlantic and Caribbean Sea remain well above average (0.56oC). This combination of conditions is known to produce high levels of Atlantic hurricane activity.
So far this season, there have been three Atlantic named storms (Andrea, Barry, and Chantal), which is slightly above average for June and July. The Atlantic hurricane season runs from June 1 through November 30. However, the vast majority of the activity in 2007 is expected during the peak months of the season- August through October (ASO).
