HRD Monthly Science Meeting of November 2019

November’s science meeting consisted of four presentations: Andy Hazelton -  “Global-Nested HAFS 2019 Real-time Demo Results” Ghassan Alaka - "2019 Basin-scale HWRF (HWRF-B): An HFIP Real-Time Demonstration Project on WCOSS" James Hlywiak -  “Sensitivities of the Decay of the Near-Surface Tropical Cyclone Wind Field to Inland Surface Roughness and Soil Moisture“ Rob Rogers -  “A comparison of a … Continue reading HRD Monthly Science Meeting of November 2019

HRD Seminar – Alrick Green, NERTO – San Jose State University – 12 November 2019

Alrick, participating in the NOAA Experiential Research and Training Opportunities (NERTO) program, presented a seminar titled “Understanding the Role of Eddy Vorticity Fluxes on the Rapid Intensification of Hurricane Irma (2017) and Michael (2018)”.  ABSTRACT The relationship between rapid intensification and environmental forcing is investigated for Hurricane Irma (2017) and Hurricane Michael (2018) using the … Continue reading HRD Seminar – Alrick Green, NERTO – San Jose State University – 12 November 2019

Scientists show how Hurricane Edouard in 2014 rapidly intensified despite wind shear and dry air in paper released online in The Journal of the Atmospheric Sciences

Summary:  Tropical cyclones (TCs) usually weaken when there is a large change in the wind speed or direction with height (wind shear) or when there is dry air in the core.  Some TCs, like Hurricane Edouard (2014) can intensify, even rapidly, under these conditions. We use a series of model runs to understand how a … Continue reading Scientists show how Hurricane Edouard in 2014 rapidly intensified despite wind shear and dry air in paper released online in The Journal of the Atmospheric Sciences

HRD Monthly Science Meeting of October 2019

October’s science meeting consisted of seven presentations: Sim Aberson -  “A comparison of SAMURAI, HEDAS, and radar analyses for Hurricane Patricia (and a sneak peek into Dorian)” Lisa Bucci - "Understanding the response of tropical cyclone structure to the assimilation of synthetic wind profiles" Hui Christophersen - "TROPICS Radiance OSSE Update" Xiaomin Chen -  “A … Continue reading HRD Monthly Science Meeting of October 2019

Paper on how tropical cyclones in shear intensify published in Geophysical Research Letters

Summary: Tropical cyclones (TCs) are made up of thunderstorms (what we call convection), and these storms have strong winds moving up and down (what we call up- and downdrafts). Dry air enhances evaporative cooling (the same process that cools people when they sweat) from convective downdrafts, reducing the temperature and humidity in low levels; this … Continue reading Paper on how tropical cyclones in shear intensify published in Geophysical Research Letters

Paper on how downdrafts in hurricanes affect intensity published in Monthly Weather Review

Summary: This study looks at differences between tropical cyclones that strengthen and those that do not using data collected by dropsondes, small instruments released from hurricane hunter aircraft that measure wind, temperature, and moisture as they fall to the surface. Important Conclusions: 1. The fuel that supports tropical cyclones is the heat and moisture from … Continue reading Paper on how downdrafts in hurricanes affect intensity published in Monthly Weather Review

Hurricane Field Program Update — Friday, September 20, 2019, 5pm EDT

NOAA49 will conduct a tropical cyclone in shear research in and around Hurricane Jerry.  Takeoff will be from Barbados at 1330 AST (1730 UTC), with recovery in Lakeland about 8 hours later.  NOAA42 will be conducting an operational INVEST mission into AL99 just to the east of the Windward Islands, with takeoff at 1030 AST … Continue reading Hurricane Field Program Update — Friday, September 20, 2019, 5pm EDT

Hurricane Field Program Update — Thursday, September 19, 2019, 10pm EDT

NOAA49 will conduct an operational synoptic surveillance mission around Hurricane Jerry, taking off from Barbados at 130 EDT (1730 UTC), and landing there about 8 hours later.  The goal is to gather dropwindsonde data to improve model forecasts of the hurricane.  The targets for this mission are Jerry itself and the subtropical ridge to its … Continue reading Hurricane Field Program Update — Thursday, September 19, 2019, 10pm EDT

50th Anniversary of Hurricane Debbie seeding

Hurricane Debbie’s eye as seen from ESSA DC-6 On August 18th and 20th, 1969, Hurricane Debbie was subjected to a seeding experiment as part of Project STORMFURY.  STORMFURY was a joint Navy and Environmental Science Services Administration (ESSA, the predecessor of NOAA) project to test the hypothesis that seeding hurricanes with silver iodide would disrupt … Continue reading 50th Anniversary of Hurricane Debbie seeding

HRD Debrief for missions into Hurricane Barry – 9 August 2019

HRD researchers discussed the results from the 5 P-3 missions into Hurricane Barry, AL02 (10-12 July 2019). The agenda for the discussion was: Agenda: Missions Overview (Jon Zawislak) Deployment Overview (Jon Zawislak) 190710H1 (Rob Rogers) 190711H1 (Frank Marks) 190711H2 (Rob Rogers) 190712H1 (Frank Marks) 190712H2 (Rob Rogers) EMC (Henry Winterbottom) Slides from all presentations are … Continue reading HRD Debrief for missions into Hurricane Barry – 9 August 2019