Tropical Cyclogenesis Initiated by Lee Vortices and Mesoscale Convective Complexes in East Africa
نویسنده
چکیده
(A) Numerical Modeling: To answer the first question, we perform realistic numerical simulations of the environment of a land-based tropical disturbance (an AEW comprised of an MCC and an MV) in the vicinity of the EH. The disturbance is a precursor to the eventual genesis of Hurricane Alberto of 2000 (Hill and Lin 2003). We use the COAMPS® model, provided by the Marine Meteorological Division of the Naval Research Laboratory, and the MM5, provided by Penn State University (PSU) and the National Center for Atmospheric Research (NCAR). Realistic simulations are performed using two nested domains with 12-km and 4-km grid spacing, respectively, over a period of 72 h beginning at 00 UTC 27 July 2000.
منابع مشابه
Large-Scale Patterns Associated with Tropical Cyclogenesis in the Western Pacific
Five characteristic, low-level, large-scale dynamical patterns associated with tropical cyclogenesis in the western North Pacific basin are examined along with their capacity to generate the type of mesoscale convective systems that precede genesis. An 8-yr analysis set for the region is used to identify, and create composites for, the five characteristic patterns of monsoon shear line, monsoon...
متن کاملA Vortical Hot Tower Route to Tropical Cyclogenesis
A nonhydrostatic cloud model is used to examine the thermomechanics of tropical cyclogenesis under realistic meteorological conditions. Observations motivate the focus on the problem of how a midtropospheric cyclonic vortex, a frequent by-product of mesoscale convective systems during summertime conditions over tropical oceans, may be transformed into a surface-concentrated (warm core) tropical...
متن کاملDetailed Analyses of Precipitation Patterns Associated With Mesoscale Features Accompanying United States East Coast Cyclogenesis
Detailed hourly precipitation patterns are can also be tracked in the wind and pressure fields. Finally, analyzed for two major winter U.S. east coast storms that some thoughts are offered on the possible dynamic signifiexhibited considerable mesoscale features. Pronounced cance of organized mesoscale precipitation patterns, spatial and temporal continuity is noted for individual along with com...
متن کاملMesoscale Interactions in Tropical Cyclone Genesis
With the multitude of cloud clusters over tropical oceans, it has been perplexing that so few develop into tropical cyclones. The authors postulate that a major obstacle has been the complexity of scale interactions, particularly those on the mesoscale, which have only recently been observable. While there are well-known climatological requirements, these are by no means sufficient. A major rea...
متن کاملPatterns of Precipitation and Mesolow Evolution in Midlatitude Mesoscale Convective Vortices
Surface pressure manifestations of mesoscale convective vortices (MCVs) that traversed Oklahoma during the periods May–August 2002–05 are studied using the Weather Surveillance Radar-1988 Doppler (WSR88D), the Oklahoma Mesonet, and the NOAA Profiler Network data. Forty-five MCVs that developed from mesoscale convective systems (MCSs) have been investigated, 28 (62%) of which exhibit mesolows de...
متن کامل