HRD Monthly Science Meeting of February 2018

February’s science meeting consisted of three presentations: Rob Rogers: The relationship between tropical cyclone structure and intensification in moderate vertical shear Jon Zawislak: 2018 NOAA/AOML/HRD Hurricane Field Program Intensity Forecast Experiment (IFEX): Overview of Experiment Design Pete Black: Emerging Airborne Technologies for improved TC Track and Intensity Forecasting: Preliminary Observations from SHOUT and EPOCH All the …

Paper on updrafts in hurricanes and how they relate to intensity changes released online in Monthly Weather Review

Summary:  NOAA Hurricane Hunter aircraft have a Doppler radar that measures wind through the entire hurricane.  We analyzed these radar data collected in many hurricanes since 2004.  Previous studies found that the location of the fastest upward moving air (what we call updrafts) may tell us how strong the storm will be a few hours …

Paper on the difference between rapidly intensifying storms and those that don’t intensify as fast published in Journal of the Atmospheric Sciences

Summary: The main model that forecasters use to predict what a hurricane will do is the Hurricane Weather Research and Forecast (HWRF) model. Because we cannot measure what is currently happening in the hurricane exactly, we run the model many times at once with different measurements to get an idea of the different forecasts that …

HRD Monthly Science Meeting of December 2017

December’s science meeting consisted of three presentations: Dave Nolan:  Preliminary results on the sources of condensate in the hurricane outflow layer Jun Zhang:  Observations of gravity waves in tropical cyclones Leon Nguyen:  Assessing tropical cyclone intensity change in moderate vertical wind shear using dropsondes: thermodynamics of the lower troposphere All the presentations are available on …

Paper on how tropical storms do (or don’t) organize thunderstorms around the center to intensify published in Monthly Weather Review

It has been believed that tropical cyclones are likely to strengthen when strong thunderstorms (called convection) almost completely surround the storm's center. In order to better understand what prevents this convection from surrounding the storm’s center in some storms (but not others), this study analyzes data collected on NOAA aircraft flights in two storms that …

HRD Debrief for missions into Hurricanes Irma, Jose, and Maria – Part 1 – 4 October 2017

HRD researchers discussed the results from the 8 P-3 and 8 G-IV missions into Hurricane Irma (3-8 September 2017). The agenda for the discussion was: Missions Overview (Reasor) Science Discussions 20170903H1 TDR (Jon Zawislak) 20170904H1 TDR (Rob Rogers) 20170904H2 TDR (Jon Zawislak) 20170905H1 TDR (Rob Rogers) 20170905H2 TDR (Jon Zawislak) 20170908H1 TDR (Jon Zawislak) 20170908H2 …

HRD Seminar – Dr. David Ryglicki, Naval Research Laboratory – 17 August 2017

Dr. Ryglicki presented a seminar titled  “The Kinematics of Rapidly Intensifying Hurricanes in Moderate Vertical Wind Shear”. Abstract: A select group of tropical cyclones (TCs) which unexpectedly undergo rapid intensification in moderate vertical wind shear are identified, analyzed, and modeled. Geostationary satellite and reanalysis data are used to identify features and environmental parameters of these TCs. …

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  

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" …

Paper on how vertical wind shear impacts surface winds in hurricanes published in Monthly Weather Review

Summary: Scatterometers are instruments on aircraft or satellites that are used to measure wind speed and direction at the ocean surface. In this follow-up to a 2016 study, the surface wind in tropical cyclones around the world are studied using a large set of measurements from 2000 to 2011. The impact of tropical cyclone intensity, …