Mesoscale Features of a Winter Storm

Mesoscale Features of a Winter Storm
Author: James I. Metcalf
Publisher:
Total Pages: 42
Release: 1990
Genre: Doppler radar
ISBN:

Doppler radars were used to observe a winter coastal storm on 12 February 1988. Measurements of the polarization differential reflectivity by radar yielded information about the changing thermodynamic phase of precipitation as the change from snow to rain progressed northward from the southern New England coast in a strongly stable environment. Doppler velocity measurements by the two radars were used to synthesize the two-dimensional wind fields. These wind fields revealed an upper-level mesoscale trough and ridge moving across the surveillance area during a two-hour period, closely preceding the large-scale clearing of the precipitation, well ahead of the surface low-pressure center. This case represents the first use of these radars for dual-Doppler wind field analysis.

Mesoscale Features of a Winter Storm

Mesoscale Features of a Winter Storm
Author: James I. Metcalf
Publisher:
Total Pages: 34
Release: 1990
Genre: Winter storms
ISBN:

Doppler radars were used to observe a winter coastal storm on 12 February 1988. Measurements of the polarization differential reflectivity by radar yielded information about the changing thermodynamic phase of precipitation as the change from snow to rain progressed northward from the southern New England coast in a strongly stable environment. Doppler velocity measurements by the two radars were used to synthesize the two-dimensional wind fields. These wind fields revealed an upper-level mesoscale trough and ridge moving across the surveillance area during a two-hour period, closely preceding the large-scale clearing of the precipitation, well ahead of the surface low-pressure center. This case represents the first use of these radars for dual-Doppler wind field analysis.

Investigation of Synoptic, Mesoscale Features in Previous Central US Winter Storms Compared to Events Occurring in Other Regions

Investigation of Synoptic, Mesoscale Features in Previous Central US Winter Storms Compared to Events Occurring in Other Regions
Author: Ralph Wade Johnson
Publisher:
Total Pages: 13
Release: 2015
Genre:
ISBN:

This further study considers parameters relevant to most intense precipitation during another nine selected central United States events and compares them to parameters relevant to most intense precipitation during nine selected southeast, middle Atlantic and northeast United States cases. The central United States parameters found to be relevant include omega ([omega])≥‐0.20 (Pa s−1) 850hpa, [omega]≥‐0.10 (Pa s−1), TROWAL, CSI and EPV, Frontogenesis (850hpa, 700hpa‐500hpa), Elevated Convection, Mesoscale Gravity Wave Interaction, EPVg and CI [(800‐ 750hpa), (650‐500hpa)], Differential Vorticity Advection (850‐500hpa), mean RH≥70%(700 – 500hpa), 850hpa convergence and 250hpa divergence, enhanced IR satellite imagery, cyclonic advection of [theta]e, Q vector convergence, 1000‐500hpa critical thickness and 850hpa temperature gradients (°K). The southeast, middle Atlantic and northeast United States parameters found to be relevant include [omega]≥‐0.20 (Pa s−1), Low Level Jet (LLJ), CSI/MSI and EPV, Frontogenesis (850hpa, 700hpa‐500hpa), Evaporative Cooling, Cyclone tracks and cyclogenesis, Latent Heat Release (LHR), Elevated Convection, Mesoscale Gravity Wave Interaction, EPVg and CI [(800‐ 750hpa), (650‐500hpa)], Differential Positive Vorticity Advection (700‐400hpa), TROWAL, 700hpa Absolute Vorticity, mean RH≥70%(700 – 500hpa), 850hpa convergence and 250hpa divergence, warm air advection(WAA), cold air advection(CAA), jet streak induced Ageostrophic circulation, potential vorticity(PV) advection into cyclone center, 1000‐500hpa thickness, 850hpa temperature gradients(°K) and isentropic potential vorticity(IPV). Although this study shows [omega]≥‐0.175 during all events, this research study depicts how other synoptic and mesoscale parameters interact with negative omega or each other to produce intense precipitation, in particular snowfall, during each of the studied cases, regardless of region.

Synoptic-Dynamic Meteorology and Weather Analysis and Forecasting

Synoptic-Dynamic Meteorology and Weather Analysis and Forecasting
Author: Lance Bosart
Publisher: Springer Science & Business Media
Total Pages: 426
Release: 2013-01-06
Genre: Science
ISBN: 0933876688

This long-anticipated monograph honoring scientist and teacher Fred Sanders includes 16 articles by various authors as well as dozens of unique photographs evoking Fred's character and the vitality of the scientific community he helped develop through his work. Editors Lance F. Bosart (University at Albany/SUNY) and Howard B. Bluestein (University of Oklahoma at Norman) have brought together contributions from luminary authors-including Kerry Emanuel, Robert Burpee, Edward Kessler, and Louis Uccellini-to honor Fred's work in the fields of forecasting, weather analysis, synoptic meteorology, and climatology. The result is a significant volume of work that represents a lasting record of Fred Sanders' influence on atmospheric science and legacy of teaching.

Scientific and Technical Aerospace Reports

Scientific and Technical Aerospace Reports
Author:
Publisher:
Total Pages: 456
Release: 1995
Genre: Aeronautics
ISBN:

Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.