Paper on changes to the intensity of tropical waves during the hurricane season released online in the Journal of Climate

African easterly waves (AEWs) are areas of low air pressure that move westward across North Africa and into the Atlantic Ocean. AEWs can cause intense thunderstorms, and, once over the warm waters of the Atlantic Ocean, they may become tropical cyclones that might affect the Caribbean and North America. In summer, many AEWs form in, […]

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Paper on easterly waves in the Eastern Pacific that can form into tropical cyclones published in The Journal of the Atmospheric Sciences

“Easterly waves” are areas of low air pressure in the tropics that move westward and may become tropical cyclones. The most well-known type of easterly wave is the “African easterly wave,” which moves from West Africa north of the equator into the Atlantic Ocean and sometimes into the Pacific. Although almost all Northeast Pacific tropical […]

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45th Anniversary of African Easterly Wave paper

In the January 1972 issue of the Journal of Atmospheric Science, Robert W. Burpee (future director of HRD) published a paper explaining the mechanism by which African Easterly Waves (AEW) formed.  Using five years of upper-air data from above Africa, he demonstrated that airflow over the Ethiopian highlands created instabilities in the wind stream that […]

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25th Anniversary of Project TEXMEX

Starting in July 1991 and running through August, MIT and NOAA carried out the Tropical Experiment in Mexico (TEXMEX).  The purpose of the project was to examine the thermal and humidity structure of the near surface layer of the atmosphere in the tropical eastern Pacific and attempt to relate elevated levels of high theta-e (equivalent […]

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10th Anniversary of AMMA

Starting in July of 2006, the African Monsoon Multidisciplinary Analysis (AMMA) project ran a major field campaign, gathering weather and ocean data from western Africa and nearby waters.  The main purpose was to document the inter-seasonal and inter-annual variability of the African Monsoon, where hot, dry air from the Sahara and warm, moist air for […]

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HRD seminar – Prof. Chris Thorncroft, University of Albany – SUNY – 21 January 2016

Prof. Thorncroft presented a seminar on the “Variability of African easterly waves and their  relationship with downstream tropical  cyclogenesis”. A copy of the presentation is available on the anonymous ftp site: ftp://ftp.aoml.noaa.gov/pub/hrd/blog/seminars/2016/Thorncroft_HRD_Seminar_20160121.pptx

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40th Anniversary of Hurricane Eloise

On the morning of September 23, 1975, Hurricane Eloise made landfall on the Florida panhandle.  A major hurricane as it struck the shore, it was the most destructive Atlantic hurricane that year. Eloise formed from an African Easterly Wave, but did not develop a closed circulation until it had crossed more than halfway across the […]

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10th Anniversary of Hurricane Rita

Early on the morning of September 24, 2005, Major Hurricane Rita came ashore near the Texas/Louisiana border.  In the midst of the very active 2005 hurricane season, Rita caused considerable panic as it approached the coast, with scenes of destruction from Hurricane Katrina still playing on TV news programs.  It left behind a swath of […]

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NOAA’s P3 aircraft is up in the air and heading towards Tropical Storm Erika

NOAA’s P-3 hurricane hunter aircraft took off from Barbados at 2:00PM to fly a Saharan Air Layer Experiment (SALEX)/Tail Doppler Radar (TDR) research mission into Tropical Storm Erika. The flight track is shown below.  The P3 will take measurements to understand how much dry air is interacting with Tropical Storm Erika. It will also collect data with the […]

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