Paper on how tropical cyclones in shear intensify released online in Geophysical Review 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 released online in Geophysical Review Letters

Jun Zhang and Rob Rogers honored with Banner I. Miller Award

The American Meteorological Society has announced that Dr. Jun Zhang, Dr. David S. Nolan, Dr. Robert F. Rogers, and Dr. Vijay S. Tallapragada have won the 2020 Banner I.  Miller Award for their paper, “Evaluating the impact of improvements in the boundary layer parameterization on hurricane intensity and structure forecasts in HWRF,” which significantly advanced … Continue reading Jun Zhang and Rob Rogers honored with Banner I. Miller Award

Paper on how downdrafts in hurricanes affect intensity released online 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 released online in Monthly Weather Review

HRD Seminar – Kelly Nuñez Ocasio, NERTO and Pennsylvania State University – 19 July 2019

Kelly presented a seminar titled “PV budget analysis on high resolution simulations to understand the interaction of AEWs with associated convection". Abstract: The role of convection and associated potential vorticity  (PV) generation have been shown to be significant in the evolution of African Easterly Waves (AEWs); however, how the evolving AEWs lead to tropical cyclogenesis … Continue reading HRD Seminar – Kelly Nuñez Ocasio, NERTO and Pennsylvania State University – 19 July 2019

HRD Monthly Science Meeting of July 2019

July’s science meeting consisted of two presentations: Hua Leighton: Revisit of Microphysics Observation Paige Brown (Stanford University): Low-cost, Altitude Controlled Latex Balloon for Mapping Atmospheric Data The two presentations are available on the anonymous ftp site at: ftp://ftp.aoml.noaa.gov/hrd/pub/blog/meetings/2019/Science/HRD_SciMeet_20190711.zip

HRD Seminar – George “Trey” Alvey, CIMAS/HRD – 16 July 2019

Trey presented a seminar titled “How do sheared tropical cyclones evolve towards symmetry before rapid intensification?" ABSTRACT: In seemingly similar environments, some moderately sheared tropical storms undergo rapid intensification (RI) evolving towards more symmetrical precipitation structures but others do not. What role do the vortex tilt, humidification, and precipitation symmetry play in helping distinguish those … Continue reading HRD Seminar – George “Trey” Alvey, CIMAS/HRD – 16 July 2019