Jason Dunion
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View article: Cloud Height Distributions and the Role of Vertical Mixing in the Tropical Cyclone Eye Derived From Compact Raman Lidar Observations
Cloud Height Distributions and the Role of Vertical Mixing in the Tropical Cyclone Eye Derived From Compact Raman Lidar Observations Open
The distribution of tropical cyclone (TC) eye cloud heights is documented for the first time using compact Raman lidar (CRL) measurements with high spatial resolution. These cloud heights act as tracers for low‐level vertical mixing in the…
View article: WMO Typhoon Landfall Forecast Demonstration Project (2010–22): A Decade of Transition from Track Forecasts to Impact Forecasts
WMO Typhoon Landfall Forecast Demonstration Project (2010–22): A Decade of Transition from Track Forecasts to Impact Forecasts Open
The Typhoon Landfall Forecast Demonstration Project (TLFDP) (2010–22) was an international cooperative scientific project conducted under the framework of the WMO. The primary objectives of the TLFDP were to enhance the capability of tropi…
View article: Recommendations for improved tropical cyclone formation and position probabilistic Forecast products
Recommendations for improved tropical cyclone formation and position probabilistic Forecast products Open
Prediction of the potentially devastating impact of landfalling tropical cyclones (TCs) relies substantially on numerical prediction systems. Due to the limited predictability of TCs and the need to express forecast confidence and possible…
View article: Track forecast: Operational capability and new techniques - Summary from the Tenth International Workshop on Tropical Cyclones (IWTC-10)
Track forecast: Operational capability and new techniques - Summary from the Tenth International Workshop on Tropical Cyclones (IWTC-10) Open
In this paper, we summarize findings from the Tenth International Workshop on Tropical Cyclones (IWTC-10) subgroup on operational track forecasting techniques and capability. The rate of improvement in the accuracy of official forecast tra…
Increase in Cape Verde hurricanes during Atlantic Niño Open
At seasonal-to-interannual timescales, Atlantic hurricane activity is greatly modulated by El Niño - Southern Oscillation and Atlantic Meridional Mode. However, they develop predominantly in boreal winter or spring, and are relatively weak…
Thermodynamic Contribution to Vortex Alignment and Rapid Intensification of Hurricane Sally (2020) Open
As a part of the Tropical Cyclone Rapid Intensification Project (TCRI), observations were made of the rapid intensification of Hurricane Sally (2020) as it passed over the Gulf of Mexico. High-altitude dropsondes and radar observations fro…
Evaluating Satellite Sounders for Monitoring the Tropical Cyclone Environment in Operational Forecasting Open
Tropical cyclones can form over open ocean where in situ observations are limited, so forecasters rely on satellite observations to monitor their development and track. We explore the utility of an operational satellite sounding product fo…
Lead Isotopes in North American Precipitation Record the Presence of Saharan Dust Open
Atmospheric dust is an important mass transfer and nutrient supply process in Earth surface ecosystems. For decades, Saharan dust has been hypothesized as a supplier of nutrients to the Amazon rainforest and eastern North America. However,…
View article: Accomplishments of NOAA’s Airborne Hurricane Field Program and a Broader Future Approach to Forecast Improvement
Accomplishments of NOAA’s Airborne Hurricane Field Program and a Broader Future Approach to Forecast Improvement Open
Since 2005, NOAA has conducted the annual Intensity Forecasting Experiment (IFEX), led by scientists from the Hurricane Research Division at NOAA’s Atlantic Oceanographic and Meteorological Laboratory. They partner with NOAA’s Aircraft Ope…
Revisiting the relationship between Atlantic dust and tropical cyclone activity using aerosol optical depth reanalyses: 2003–2018 Open
Previous studies have noted a relationship between African dust and Atlantic tropical cyclone (TC) activity. However, due to the limitations of past dust analyses, the strength of this relationship remains uncertain. The emergence of aeros…
Revisiting the Relationship between Atlantic Dust and TropicalCyclone Activity using Aerosol Optical Depth Reanalyses: 2003–2018 Open
Previous studies have noted a relationship between African dust and Atlantic tropical cyclone (TC) activity. However, due to the limitations of past dust analyses, the strength of this relationship remains uncertain. The emergence of aeros…
Using persistent homology to quantify a diurnal cycle in hurricanes Open
The diurnal cycle of tropical cyclones (TCs) is a daily cycle in clouds that appears in satellite images and may have implications for TC structure and intensity. The diurnal pattern can be seen in infrared (IR) satellite imagery as cyclic…
In Situ Observations of the Diurnal Variation in the Boundary Layer of Mature Hurricanes Open
Recent studies have suggested that the structure of tropical cyclones (TCs), especially the upper‐level clouds as indicated by satellite infrared brightness temperatures and precipitation, fluctuates with the diurnal cycle. The diurnal cyc…
Using Persistent Homology to Quantify a Diurnal Cycle in Hurricane Felix Open
The diurnal cycle of tropical cyclones (TCs) is a daily cycle in clouds that appears in satellite images and may have implications for TC structure and intensity. The diurnal pattern can be seen in infrared (IR) satellite imagery as cyclic…
Overview of the NASA TROPICS CubeSat Constellation Mission Open
Recent technology advances in miniature microwave radiometers that can be hosted on very small satellites has made possible a new class of affordable constellation missions that provide very high revisit rates of tropical cyclones and othe…
Sensing Hazards with Operational Unmanned Technology Open
"The primary scientific goal of the Sensing Hazards with Operational Unmanned Technology (SHOUT) Project is to determine the potential utility of observations from high-altitude, long- endurance unmanned aircraft systems (UAS) such as the …
Composite Impact of Global Hawk Unmanned Aircraft Dropwindsondes on Tropical Cyclone Analyses and Forecasts Open
The impacts of Global Hawk (GH) dropwindsondes on tropical cyclone (TC) analyses and forecasts are examined over a composite sample of missions flown during the NASA Hurricane and Severe Storm Sentinel (HS3) and the NOAA Sensing Hazards wi…
A Terrestrial Gamma‐Ray Flash inside the Eyewall of Hurricane Patricia Open
On 23 October 2015 at ~1732 UTC, the Airborne Detector for Energetic Lightning Emissions (ADELE) flew through the eyewall of Hurricane Patricia aboard National Oceanic and Atmospheric Administration's Hurricane Hunter WP‐3D Orion, observin…
An overview of the TROPICS NASA Earth Venture Mission Open
The Time‐Resolved Observations of Precipitation structure and storm Intensity with a Constellation of Smallsats (TROPICS) mission was selected by NASA as part of the Earth Venture‐Instrument (EVI‐3) program. The overarching goal for TROPIC…
Sensing Hazards with Operational Unmanned Technology: 2015–2016 Campaign Summary, Final Report Open
NOAA Technical Memorandum OAR UAS ; 001
A View of Tropical Cyclones from Above: The Tropical Cyclone Intensity Experiment Open
Tropical cyclone (TC) outflow and its relationship to TC intensity change and structure were investigated in the Office of Naval Research Tropical Cyclone Intensity (TCI) field program during 2015 using dropsondes deployed from the innovat…
A View of Tropical Cyclones from Above: The Tropical Cyclone Intensity Experiment Open
Tropical cyclone (TC) outflow and its relationship to TC intensity change and structure were investigated in the Office of Naval Research Tropical Cyclone Intensity (TCI) field program during 2015 using dropsondes deployed from the innovat…
On the Secondary Eyewall Formation of Hurricane Edouard (2014) Open
A first observationally based estimation of departures from gradient wind balance during secondary eyewall formation is presented. The study is based on the Atlantic Hurricane Edouard (2014). This storm was observed during the National Aer…
The tropical cyclone diurnal cycle Open
The research presented in this thesis explores a phenomenon referred to as the tropical cyclone (TC) diurnal cycle (TCDC) and presents satellite, numerical modeling, and observational perspectives pertaining to how it can be monitored, its…