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Characteristics of Tropopause Polar Vortices Based on Observations Over The Greenland Ice Sheet
(2018-12-14)
Tropopause Polar Vortices (TPVs) are long-lived, coherent vortices that are identified by closed material contours of potential temperature on the dynamic tropopause. They are characterized by PV anomalies that spend most ...
Abrupt Agricultural Flash Drought: An Investigation of Rapid Drought Development Across Vital Agricultural Zones of the United States
(2023-05-12)
Flash droughts are highly impactful, subseasonal to seasonal events that pose a severe risk to agricultural production. The 2012 flash drought event in the United States is a prime example, as this event resulted in tens ...
Understanding and Predicting Nocturnal Convection Initiation using an Ensemble-based Multi-scale Data Assimilation System
(2016-08-12)
A nocturnal maximum in precipitation exists over the Great Plains during the summer. The initiation of nocturnal storms is notoriously difficult to forecast in numerical models due to the storms often involving interactions ...
Multi-scale object-based probabilistic forecast evaluation of WRF-based CAM ensemble configurations
(2020)
Recent developments in numerical weather prediction have included increased usage of ensemble forecasts in contrast to single, deterministic forecasts. In particular, convection-allowing model (CAM) ensembles have been ...
Exploring CopterSonde Use for National Weather Service Operations
(2023-05-12)
The CopterSonde is a state of the art sampling platform that can be used to advance the field of meteorology in operational forecasting and data collection. One capability of the CopterSonde is that it can collect ...
Investigating Arctic Cyclone-Tropopause Polar Vortex Interactions with Observing System Simulation Experiments
(2023-05-12)
Tropopause polar vortices (TPVs) are upper-level cyclonic circulations that are common in high latitudes. TPVs most directly impact weather at the surface by providing baroclinic forcing for the development of Arctic ...
A Heat Wave Definition Employed across the Southern Great Plains for Trend Analysis from 1979-2019
(2021-08)
Subseasonal-to-seasonal (S2S) extremes occur frequently in the Southern Great Plains (SGP), more specifically heat waves. Heat waves are expected to increase in frequency, duration, and intensity in several regions globally, ...
Nocturnal Ascent and Low-Level Jet in a Baroclinic Zone
(2022-05)
A remarkable feature of the regional climatology of the central United States and the Great Plains is the existence of a nocturnal maximum in convective rainfall during the warm season. This study follows up the work of ...
Cloud-radiative feedbacks within the Madden-Julian Oscillation
(2021)
The Madden-Julian Oscillation (MJO) affects weather and climate globally, however it has been challenging to accurately represent it in Global Circulation Models (GCMs) which can lead to uncertainties with future climate ...
Inferring Bulk Microphysical Characteristics of Mesoscale Convective Systems Using Polarimetric Radar Observations
(2017)
In 2013, the network of NEXRAD WSR-88D’s were upgraded to dual-polarization. Dual-polarization allows for the identification of particle shape, size, orientation, and concentration within a radar sample volume due to the ...