Review of extratropical transition released online in Monthly Weather Review

Summary: When tropical cyclones move out of the tropics toward the poles, they reach areas where fronts exist and where the ocean, whose warm water fuels tropical storms, is relatively cool. When this happens, the storms go through extratropical transition (ET) and become like other storms in the mid latitudes. The storms can cause catastrophic […]

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HRD Debrief for missions into Hurricane Franklin – 15 August 2017

HRD researchers discussed the results from the two P-3 and one Global Hawk mission into Hurricane Franklin (8-9 August 2017). The agenda for the discussion was: Mission Overview (Reasor) Science Discussions 20170808H1 (Zawislak) 20170809H1 (Rogers) EMC input (Sippel) Additional field program issues Slides from the debrief are available at: ftp://ftp.aoml.noaa.gov/pub/hrd/blog/meetings/2017/HFP/franklin17_debrief_main.pptx  

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Paper on the accuracy of surface windspeed analyses published in Monthly Weather Review

Summary:  Sometimes, the wind at the surface around a hurricane is the same around the storm center (what we call a symmetric pattern), and at other times, it is different (what we call an asymmetric pattern). In addition, sometimes the wind pattern stays the same, and sometimes it changes quickly. This study looks at how […]

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HRD Monthly Science Meeting of August 2017

August’s science meeting consisted of 5 presentations: Jason Sippel: “Examining impact of recon in operational HWRF” Steve Diaz: “Demonstration of solver-independent regridding operation for a moving hurricane nest” Joe Cione: “Infrared Sea Surface Temperature Measurements from Hurricane Edouard (2014) using GPS dropsondes” John Kaplan: “Hurricane Franklin (2017): A Preliminary Look from a Global Hawk-P3 Perspective” […]

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Mini-Dropwindsonde data from Global Hawk used in forecast models for the first time during Hurricane Franklin

For the first time, data from mini-dropwindsondes released by the Global Hawk aircraft were used by NOAA Global Forecast System to predict where Franklin might track, how strong it would get, and other weather around the globe.  A total of 48 mini-dropsondes were released by the Global Hawk on the morning and afternoon of 9 […]

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Paper on accounting for the location of dropwindsondes during measurements published in the Journal of Atmospheric and Oceanic Technology

Summary: Hurricane Hunter aircraft have been releasing instruments called dropwindsondes to measure pressure, temperature, moisture, and wind speed and direction in hurricanes for two decades. Data from dropwindsondes released near the storms have led to better forecasts of where they will go, but improvements to forecasts of how strong they will get have lagged. Part […]

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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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HRD Scientists brief NOAA Aircraft Operations Center personnel on IFEX 2017, Lakeland, FL – 19 July 2017

Intensity Forecast Experiment (IFEX) Program Director Paul Reasor and HRD Director Frank Marks briefed the Aircraft Operations Center (AOC) personnel at their brand new facility at Lakeland Linder Regional Airport on IFEX plans for 2017 and Hurricane Forecast Improvement Project progress, respectively. The two presentations are available in a .zip archive on the anonymous ftp […]

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HRD Monthly Science Meeting of July 2017

July’s science meeting consisted of 6 presentations: Steve Guimond (NASA) – “Reviving the Imaging Wind and Rain Airborne Profiler (IWRAP) for Hurricane Research: A Case Study of Hurricane Rita (2005)” Mu-Chieh (Laura) Ko – “Preliminary Review – HWRF-B 2016 Retrospective Dataset” Robert Rogers – “The Challenge of Intensity Forecasting in Moderate Shear” Emily Paltz (Hollings […]

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