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Variability of Tropical Cyclones in the Philippines
(2014-05-09)
The massive impacts of tropical cyclones (TCs) on the Philippines are well known. This study provides an improved understanding of TC activity in the country, allowing improved risk mitigation strategies that possibly can ...
Polarimetric Radar Observations and Numerical Simulations of Tornadic Debris
(2014-05-09)
Tornadic debris are critical aspects of tornado studies because airborne debris pose significant threats to life and property, and debris often dominate backscattered radar signals, causing biased Doppler velocity measurements. ...
Investigation of polarimetric measurements of rainfall at close and distant ranges.
(2007)
As part of continuous modernization of operational weather radar systems, several government agencies have explored adding polarimetric capability to existing networks. Polarimetric measurements of rain have been previously ...
The influence of improved land surface and soil data on mesoscale model predictions.
(2006)
A principal-component regression reveals simple relationships between latent heat flux and other available surface observations. Development of a new parameterization for evaporation from bare soil takes advantage of periods ...
Retrieval of moisture from GPS slant-path water vapor observations using 3DVAR and its impact on the prediction of convection initiation and precipitation.
(2007)
The anisotropic explicit filter is computationally expensive in both CPU time and memory usage. Therefore the implicit recursive filter which is computationally much more efficient is implemented in our 3DVAR system, even ...
ASSIMILATION OF RADAR OBSERVATIONS WITH ENSEMBLE VARIATIONAL HYBRID DATA ASSIMILATION METHOD FOR THE INITIALIZATION AND PREDICTION OF HURRICANES
(2015-05-08)
Data assimilation is a critical component for accurate model forecast. This dissertation investigated the ensemble-variational hybrid data assimilation methods using land based radar and airborne radar data for the prediction ...
Association of winter weather variability in Central and Eastern North America with tropical Pacific sea surface temperature.
(2006)
The analysis of North American daily precipitation and temperature distributions during warm and cold TP SSTA events identified unique changes. In the southeastern U.S., increased precipitation during January-March warm ...
Limitations and Potential of Complex Cloud Analysis and Its Improvement for Radar Reflectivity Data Assimilation Using OSSEs.
(2015-12-18)
The radar data assimilation is very important for improving short-range precipitation forecasts. Within the three dimensional variational (3DVAR) framework which is still the prevailing method used for operational regional ...
DEVELOPMENT OF ARPS LETKF WITH FOUR DIMENSIONAL EXTENSION AND INTERCOMPARISON WITH ARPS ENSRF
(2013-12)
The local ensemble transform Kalman filter (LETKF) has not been applied the storm-scale radar data assimilation (DA) problem until very recently. In this work, LETKF and its four-dimensional version, 4D-LETKF, are implemented ...
Diagnosis of Severe Wind Processes in Two Nocturnal MCSs Observed during PECAN
(2023-08-04)
Severe wind processes in nocturnal mesoscale convective systems (MCSs) are not well understood since historically it has been assumed that these systems are elevated due to a stable surface layer. However, recent studies ...