20th anniversary of the first ever dropwindsonde observation in a hurricane eyewall

For decades, meteorologists used dropwindsondes, weather instrument packages deployed from aircraft, to make atmospheric soundings below flight level.  Starting in the 1970s they used Omega dropwindsondes (ODWs) that employed the very low-frequency Omega navigation signals to estimate the ODW’s motion relative to the aircraft, and subsequently calculate the wind.  Because of the limitations of this system, […]

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20th anniversary of the first operational synoptic surveillance mission with the NOAA G-IV

  On 14 July, 1997, Tropical Storm Claudette was moving northeastward offshore the east coast of the US.  Eager to test the new Gulfstream-IV (G-IV) jet aircraft and the new Global Positioning System dropwindsonde, the National Hurricane Center tasked the first-ever operational synoptic surveillance mission geared toward improving track forecasts. Initial condition differences in the […]

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25th Anniversary of Hurricane Bob

On August 19, 1991, Hurricane Bob brushed the tip of Long Island and came ashore in Rhode Island.  Although only a Category 2 hurricane at that time, Bob managed to rack up a sizable damage bill to become one of the costliest New England hurricanes. Bob formed from a disturbance that split from a frontal […]

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30th Anniversary of Hurricane Gloria

On September 27, 1985, Hurricane Gloria swept over the Outer Banks then rushed across Long Island, New England, and Canada.  It was the first significant hurricane to hit New England in twenty-five years and brought heavy rains and high winds to the Mid-Atlantic states as well. Gloria began as a tropical depression over the Cape […]

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20th Anniversary of Hurricane Luis

On the night of September 4, 1995, Hurricane Luis roared over the Lesser Antilles, bringing destruction to Antigua and Barbuda.  Luis also brought strong winds to Guadeloupe and Dominica and was the strongest hurricane to make landfall during the very busy 1995 hurricane season. Luis formed near the Cape Verde Islands and took a week […]

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25th Anniversary of a ‘hairy hop’ into Hurricane Hugo

NOAA 42 radar display of Hugo’s eyewall On September 15, 1989, NOAA 42 “Kermit” flew a research mission into Hurricane Hugo, east of Barbados, that became what old-time Hurricane Hunters called a “hairy hop”.  This referred to a hurricane flight where the turbulence was so severe as to put the mission in jeopardy. The day […]

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Hurricane related anniversaries observed in 2011

2011 Hurricane anniversaries 5th Anniversary (2006) African Monsoon Multidisciplinary Analyses (AMMA) experiment examines the wind regimes over western Africa and their role in generating disturbances over the Atlantic. The NASA African Monsoon Multidisciplinary Analyses (NAMMA) experiment similarly seeks to investigate these disturbances off the African coast using aircraft and the CALIPSO satellite. Richard Anthes, Robert […]

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