Results 141 to 150 of about 534 (178)

Intense Arctic mesocyclones

Izvestiya, Atmospheric and Oceanic Physics, 2007
Characteristics of polar mesoscale cyclones (PMCs) over the North European Basin are analyzed using cloud cover distribution data for 1981–1995. Special features of the annual cycle and interannual variations in characteristics of Arctic mesocyclones with a spiral and comma-shaped cloud structure are discussed.
I. I. Mokhov, M. G. Akperov, V. E. Lagun, E. I. Lutsenko   +3 more
openaire   +1 more source

Low-Level Mesocyclonic Concentration by Nonaxisymmetric Transport. Part I: Supercell and Mesocyclone Evolution [PDF]

Journals of the Atmospheric Sciences, 2006
Abstract An idealized simulation of a supercell using the Regional Atmospheric Modeling System (RAMS) was able to produce a low-level mesocyclone near the intersection of the forward- and rear-flank downdrafts. The creation of the low-level mesocyclone is similar to previous studies.
Brian J. Gaudet, William R. Cotton
exaly   +2 more sources

On the Environments of Tornadic and Nontornadic Mesocyclones

Weather and Forecasting, 1994
Abstract The authors investigated differences in the environments associated with tornadic and nontornadic mesocyclones are investigated using proximity soundings. Questions about the definition of proximity are raised. As the environments of severe storms with high spatial and temporal resolution are observed, the operational meaning of proximity ...
Harold E. Brooks, Charles A. Doswell, Jeremy Cooper   +2 more
openaire   +1 more source

Synoptic aspects of Antarctic mesocyclones

Journal of Geophysical Research: Atmospheres, 1993
The characteristic regimes (formation and dissipation areas, tracks) and synoptic environments of cold air mesocyclones over Antarctic and Subantarctic latitudes are determined for the contrasting winters (June, July, and August) of 1988 and 1989. Defense Meteorological Satellite Program (DMSP) thermal infrared (IR) imagery is used in conjunction with ...
Andrew M. Carleton, Mark Fitch
openaire   +1 more source

A Climatology of Cell Mergers with Supercells and Their Association with Mesocyclone Evolution

Monthly Weather Review, 2022
Abstract In this study, we present a climatology of observed cell mergers along the paths of 342 discrete, right-moving supercells and their association with temporal changes in low-level mesocyclone strength (measured using azimuthal shear). Nearly one-half of the examined supercells experience at least one cell merger.
Matthew D. Flournoy, Anthony W. Lyza, Martin A. Satrio, Madeline R. Diedrichsen, Michael C. Coniglio, Sean Waugh   +5 more
openaire   +1 more source

The Observed Inflow Structure of a Thunderstorm with a Mesocyclone

Monthly Weather Review, 1994
Abstract Inbound and outbound passes were made with an instrumented aircraft at a variety of altitudes in the inflow region of a severe thunderstorm containing a mesoscale vortex. The streamwise vorticity, helicity, and geostrophic thermal advection were estimated from these data.
John Marwitz, Donald W. Burgess
openaire   +1 more source

Mesocyclones in Central Europe as seen by radar

Atmospheric Research, 2016
Abstract The occurrence and characteristics of mesocyclones in Central Europe as seen by radar are analysed. A three year analysis shows an annual and diurnal cycle with a wider maximum in the late afternoon/evening compared to the diurnal cycle of general thunderstorms.
Kathrin Wapler, Thomas Hengstebeck, Pieter Groenemeijer   +2 more
openaire   +1 more source

Satellite sensing of intense winter mesocyclones over the Japan Sea

2011 IEEE International Geoscience and Remote Sensing Symposium, 2011
Mesoscale cyclonic activity is one of the characteristics of the cold season in the Japan Sea. High winds and precipitation accompanying intense mesoscale cyclones (MCs) disturb transport and fishery operations in the sea and small sizes and fast development hinders their forecast and detection.
Leonid M. Mitnik, Irina A. Gurvich, Mikhail K. Pichugin   +2 more
openaire   +2 more sources

Mesocyclone Detection and Classification Algorithm.

1983
Abstract : A proposed four-dimensional algorithm for automated detection of mesocyclones employs resolution-dependent thresholds of rotational velocity and shear. This algorithm incorporates complementary features of earlier techniques suggested by Hennington and Burgess and by Forsyth, Bjerkaas and Petrocchi.
null Jr, Ralph J. Donaldson, James G. Wieler   +2 more
openaire   +1 more source

Mesocyclone Evolution and Tornadogenesis: Some Observations

Monthly Weather Review, 1978
Abstract Updraft mesocyclones in tornado-producing thunderstorms form along convergent and cyclonically sheared boundaries that separate inflow air entering forward and rear storm quadrants. Maximum tangential flow resides in girding wind bands, averaging usually less than 3 km in radius (depending upon the development stage), that strengthen near ...
openaire   +1 more source