Results 151 to 160 of about 534 (178)
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Severe Thunderstorm Evolution and Mesocyclone Structure as Related to Tornadogenesis
Monthly Weather Review, 1979Abstract Severe thunderstorm evolution is synthesized, using published and unpublished studies of radar, instrumented aircraft, visual and surface observations. These observations reveal the existence of a downdraft (originating at 7–10 km AGL) on the relative upwind side of the updraft.
Charles A. Doswell III, Leslie R. Lemon
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Intense mesocyclones in the Black Sea region
Russian Meteorology and Hydrology, 2016The statistical study of intense mesoscale cyclones formed in the Black Sea region in 1979-2013 is carried out using the surface wind data of the RegCM climate model. Such cyclone parameters as intensity, lifetime, area, height, and trajectories over the sea as well as the place and time of origin are considered.
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Characterization of mesocyclonic rotation in severe convection over the Swiss Alps
2021<p>Persistent rotation is a strong indicator of severe weather hazards in convective storms. This work presents a multi-year record of mesocyclonic rotation tracks derived from archived operational radar data in Switzerland. In addition to the general occurrence, underlying seasonal and daily trends, as well as the influence of synoptic ...
Monika Feldmann +2 more
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Mesocyclone Evolution and Differences Between Isolated and Embedded Supercells
Atmospheric and Climate Sciences, 2013 A total of 61 supercells with mesocyclones lasting for at least 6 volume scans were investigated. These storm parameters and mesocyclone parameters were counted and compared to determine the salient differences between isolated supercells and embedded supercells in different regions.
Xiuguang Diao, Qian Shi, Houfu Zhou
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Automatic Detection of Mesocyclonic Shear with Doppler Radar
Journal of Atmospheric and Oceanic Technology, 1985Abstract A region of high wind shear always accompanies large intense tornadoes. Such shear is readily measured by Doppler radar and thus can be used to identify regions in storms where tornadoes are likely to form. An algorithm developed at the National Severe Storms Laboratory uses decision thresholds to discriminate between mesocyclone shear and ...
D. S. Zrnić +2 more
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Automatic Tornado Prediction With an Improved Mesocyclone-Detection Algorithm
Weather and Forecasting, 1992Abstract A new and improved algorithm for automatic mesocyclone detection is presented and tested on 23 mesocyclonic storms. A small false-alarm rate (4%) and high probability of detection (83%) are achieved for mesocyclone classification. A unique innovation of the algorithm is the automatic assessment of mesocyclone tornado potential.
Paul R. Desrochers, Ralph J. Donaldson
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Clear-Air Mesocyclone during the JAWS Project
Monthly Weather Review, 1986Documentation is furnished for the clear air mesocyclone that propagated through the network of the Joint Airport Weather Studies project near Denver, CO, on June 5, 1982. Despite present classification as a mesocyclone, the analyses here reported have revealed two separate features affecting the area: a mesocirculation, defined by the kinematics of ...
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An Analysis of a Mesocyclone–Induced Tornado Occurrence in Northern California
Weather and Forecasting, 1991Abstract One documented F2 tornado and several other unconfirmed tornadoes were reported in California's Sacramento Valley on 24 September 1986. The synoptic pattern which occurred that day was one long-recognized by California operational meteorologists as being associated with severe weather in the state.
Scott A. Braun, John P. Monteverdi
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The Interactions of Gravity Waves with Mesocyclones: Preliminary Observations and Theory
Monthly Weather Review, 2008Abstract Apparent interactions between ducted gravity waves and preexisting mesocyclones are investigated. Preliminary analyses of Weather Surveillance Radar-1988 Doppler (WSR-88D) observations from several cases reveal that the intersection of fine lines, whose propagation speed is consistent with that of gravity waves, and existing ...
Kevin R. Knupp, Timothy A. Coleman
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Comments on “A Winter Mesocyclone over the Midwestern United States”
Weather and Forecasting, 1990Ces commentaires mettent en evidence les avantages d'une analyse detaillee de surface isotherme dans le cas de cyclones associes aux masses d'air ...
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