HRD Seminar – Kyle Ahern, Florida State University – 4 September 2018

Mr. Ahern presented a seminar titled “Observed and Simulated Boundary Layer Structures in the Hurricane Inner-core During Intensity Change”. ABSTRACT: GPS dropwindsonde data from Atlantic basin aircraft reconnaissance missions (Hock and Franklin 1999) between 1998 and 2015 are gathered to construct composites of the hurricane inner-core boundary layer during modes of intensity change. Sounding information … Continue reading HRD Seminar – Kyle Ahern, Florida State University – 4 September 2018

15th anniversary of publication of seminal work on wind profiles in the tropical cyclone eyewall from dropwindsondes

Starting in 1996, NOAA phased out use of the obsolete Omega DropWindsondes (ODW) in favor of the Global Positioning Satellite (GPS) Dropwindsondes.  In addition to being more accurate due to the superior navigation system, this next-generation sonde was also more moisture tolerant.  ODWs would fail in they were launched in areas of heavy rain, but … Continue reading 15th anniversary of publication of seminal work on wind profiles in the tropical cyclone eyewall from dropwindsondes

35th Anniversary of first Synoptic Flow mission

On September 14, 1982, NOAA42 flew the first Synoptic Flow Experiment around Hurricane Debby.  The idea behind the experiment was to fly a large-scale pattern around a hurricane while releasing dropwindsondes at regular intervals.  This would create a three-dimensional map of the winds steering the storm.  The data would be entered into hurricane track forecast … Continue reading 35th Anniversary of first Synoptic Flow mission

25th Anniversary of Hurricane Andrew striking South Florida

In the early morning hours of August 24, 1992, Category-Five Hurricane Andrew roared across southern Florida leaving behind a trail of devastation that stunned the nation.  Andrew was the first hurricane of this ferocity to hit the continental United States since Hurricane Camille in 1969, and repercussions of its landfall were felt in the world … Continue reading 25th Anniversary of Hurricane Andrew striking South Florida

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, … Continue reading 20th anniversary of the first ever dropwindsonde observation in a hurricane eyewall

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

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 … Continue reading 25th Anniversary of Hurricane Bob

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 … Continue reading 30th Anniversary of Hurricane Gloria

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 … Continue reading 20th Anniversary of Hurricane Luis