scholarly journals Maintenance Mechanism and Thermodynamic Structure of a Baiu Frontal Rainband Retrieved from Dual Doppler Radar Observations

1995 ◽  
Vol 73 (3) ◽  
pp. 717-735 ◽  
Author(s):  
Masayuki Kawashima ◽  
Kazuhisa Tsuboki ◽  
Tomio Asai
Keyword(s):  
Doppler Radar ◽  
Radar Observations ◽  
Thermodynamic Structure ◽  
Maintenance Mechanism ◽  
Dual Doppler Radar

scholarly journals Dual-Doppler Radar Observations on Factors Causing Differences in the Structure of Snow Clouds during Winter Monsoon Surges

2004 ◽  
Vol 82 (1) ◽  
pp. 179-206 ◽  
Author(s):  
Hiroyuki YAMADA ◽  
Hiroshi UYEDA ◽  
Katsuhiro KIKUCHI ◽  
Masayuki MAKI ◽  
Koyuru IWANAMI
Keyword(s):  
Doppler Radar ◽  
Winter Monsoon ◽  
Radar Observations ◽  
Dual Doppler Radar

scholarly journals On the Use of Dual-Doppler Radar Measurements for Very Short-Term Wind Power Forecasts

2018 ◽  
Vol 10 (11) ◽  
pp. 1701 ◽  
Author(s):  
Laura Valldecabres ◽  
Nicolai Nygaard ◽  
Luis Vera-Tudela ◽  
Lueder von Bremen ◽  
Martin Kühn
Keyword(s):  
Wind Speed ◽  
Wind Turbine ◽  
Wind Power ◽  
Electricity Market ◽  
Doppler Radar ◽  
Short Term ◽  
Radar Observations ◽  
Spatial Coverage ◽  
Probabilistic Forecasts ◽  
Dual Doppler Radar

Very short-term forecasts of wind power provide electricity market participants with extremely valuable information, especially in power systems with high penetration of wind energy. In very short-term horizons, statistical methods based on historical data are frequently used. This paper explores the use of dual-Doppler radar observations of wind speed and direction to derive five-minute ahead deterministic and probabilistic forecasts of wind power. An advection-based technique is introduced, which estimates the predictive densities of wind speed at the target wind turbine. In a case study, the proposed methodology is used to forecast the power generated by seven turbines in the North Sea with a temporal resolution of one minute. The radar-based forecast outperforms the persistence and climatology benchmarks in terms of overall forecasting skill. Results indicate that when a large spatial coverage of the inflow of the wind turbine is available, the proposed methodology is also able to generate reliable density forecasts. Future perspectives on the application of Doppler radar observations for very short-term wind power forecasting are discussed in this paper.

Polarimetric and Dual-Doppler Radar Observations of the Lipscomb County, Texas, Supercell Thunderstorm on 23 May 2002

2009 ◽  
Vol 137 (2) ◽  
pp. 544-561 ◽  
Author(s):  
Jeffrey Frame ◽  
Paul Markowski ◽  
Yvette Richardson ◽  
Jerry Straka ◽  
Joshua Wurman
Keyword(s):  
Doppler Radar ◽  
Polarimetric Radar ◽  
Vorticity Field ◽  
Radar Observations ◽  
Low Level ◽  
Mature Phase ◽  
Numerical Studies ◽  
Vorticity Generation ◽  
Supercell Thunderstorm ◽  
Dual Doppler Radar

Abstract Polarimetric and dual-Doppler observations of a supercell observed by the National Center for Atmospheric Research (NCAR) S-band Polarimetric (SPOL) radar, two Doppler-On-Wheels (DOW) radars, and the Greek XPOL radar on 23 May 2002 during the International H2O Project (IHOP) are presented. The polarimetric radar observations began as the storm organized into a supercell and continued for over an hour while the storm was in its mature phase. The hydrometeor distribution within the mature storm was retrieved using a fuzzy logic hydrometeor classification algorithm. The dual-Doppler radar observations began around the time that the polarimetric radar observations concluded, and they covered the end of the mature phase and much of the dissipation phase of the storm. The dual-Doppler wind syntheses are used to evaluate the importance of the forward-flank outflow in augmenting the horizontal vorticity field near the storm above 400 m. In this case, having a relatively weak low-level mesocyclone, the parcel trajectories and the horizontal vorticity field observed within the forward-flank outflow are not what one would likely expect based on prior numerical studies (having generally stronger low-level mesocyclones) that have emphasized an important dynamical role for forward-flank downdrafts in terms of their horizontal vorticity generation. Instead, the observed trajectories could not be traced from the forward-flank outflow toward the storm’s updraft and the horizontal vorticity vectors within the forward-flank outflow generally did not point (westward) toward the storm’s updraft.

scholarly journals Tornadogenesis in the 12 May 2010 Supercell Thunderstorm Intercepted by VORTEX2 near Clinton, Oklahoma

2018 ◽  
Vol 146 (11) ◽  
pp. 3623-3650 ◽  
Author(s):  
Paul M. Markowski ◽  
Timothy P. Hatlee ◽  
Yvette P. Richardson
Keyword(s):  
Doppler Radar ◽  
Radar Observations ◽  
Low Level ◽  
Time Period ◽  
Supercell Storms ◽  
Supercell Thunderstorm ◽  
Dual Doppler Radar

Abstract The 12 May 2010 supercell thunderstorm intercepted by the Second Verification of the Origins of Rotation in Tornadoes Experiment (VORTEX2) is analyzed during a time period of strong low-level rotation in which dual-Doppler radar observations were collected. Two different cyclonic vortices are documented. The first vortex was “marginally tornadic” before abruptly weakening, following the development of a descending reflectivity core (DRC) similar to those that have been documented in past studies of supercells. The second vortex rapidly developed immediately north of the DRC shortly after the DRC reached low altitudes, and was associated with a tornado that produced damage near Clinton, Oklahoma. The paper explores the possible roles of the first vortex in triggering the DRC, the DRC in the subsequent initiation of a new updraft pulse on its flank, and the updraft pulse on the development of the second, stronger vortex. The Clinton storm case is, unfortunately, a nice example of the challenges in predicting tornadogenesis within supercell storms even in environments understood to be favorable for tornadoes.

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