Small, unmanned aircraft flies into rapidly intensifying Hurricane Michael

  NOAA scientists flew multiple missions into Hurricane Michael in the days before landfall, closely observing the rapid intensification of the storm. Their tools included a small unmanned aircraft, called the Coyote, which flew into the strongest winds of the eyewall as the storm intensified to a category 4 on the Saffir-Simpson scale. NOAA has … Continue reading Small, unmanned aircraft flies into rapidly intensifying Hurricane Michael

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

Paper on low-level downdrafts and their impact on intensity released online in Monthly Weather Review

Summary: In this study, we looked at radar, thermodynamic (temperature and humidity), and sea surface temperature data from the National Oceanic and Atmospheric Administration Hurricane Hunter and National Aeronautics and Space Administration aircraft in Hurricane Earl (2010). We found that there are different types of downdrafts (air moving downward) near the strongest part of the … Continue reading Paper on low-level downdrafts and their impact on intensity released online in Monthly Weather Review

Paper on turbulence near the ocean surface in Hurricane Rita released online the Journal of the Atmospheric Sciences

Summary:Knowing what is happening in the boundary layer of a hurricane (the area from the ocean surface up to about 1 km height) is very important for making accurate forecasts of how strong the hurricane will get. But measuring temperature, moisture, and wind so close to the ocean surface is dangerous and difficult. In the … Continue reading Paper on turbulence near the ocean surface in Hurricane Rita released online the Journal of the Atmospheric Sciences

Paper on the direct measurement of important air-sea interaction parameters in tropical cyclones published in the Journal of Geophysical Research

Summary:Friction is what happens when two things rub up against each other; when this happens, they release heat. When this happens in the atmosphere, we call it “dissipative heating.” Tropical cyclones (TCs) mainly gather energy from the warm ocean at the boundary layer, the region from the surface of the ocean to an altitude of … Continue reading Paper on the direct measurement of important air-sea interaction parameters in tropical cyclones published in the Journal of Geophysical Research

HRD Monthly Science Meeting of August 2018

August’s science meeting consisted of five presentations: Andrew Kren - HAMSR retrieval assimilation in the GSI system Josh Wadler (UM/RSMAS)- A Characterization of Turbulent Kinetic Energy and its Generation in Idealized Tropical Cyclone Simulations Gus Alaka - The Basin-Scale HWRF: 2018 HFIP Real-Time Demos Miguel Cortez (NERTO intern) – Summer 2018 NERTO update Stan Goldenberg … Continue reading HRD Monthly Science Meeting of August 2018

Paper on the new Doppler Wind Lidar on the NOAA Hurricane Hunters published in Remote Sensing

Summary: The warm ocean provides the energy for tropical cyclones to form and intensify. Knowing what is happening in the air immediately above this warm ocean (called the boundary layer) tells us how that energy gets into the air. So, it is important to know what is happening there to accurately predict how strong a … Continue reading Paper on the new Doppler Wind Lidar on the NOAA Hurricane Hunters published in Remote Sensing

HRD Debrief for missions into Tropical Storm Chris – 19 July 2018

HRD researchers discussed the results from the 4 P-3 missions into AL03 Tropical Storm Chris (8-9 July 2018). The agenda for the discussion was: Missions Overview (Jon Zawislak) Mission Summaries 20180708H1 TDR (Kelly Ryan) 20180708H2 TDR (Hui Christophersen) 20180709H1 TDR (Kelly Ryan) 20180709H2 TDR (Gus Alaka) Discussion Slides from the debrief are available at: ftp://ftp.aoml.noaa.gov/pub/hrd/blog/meetings/2018/HFP/2018HFP_Chris_Debrief.pptx