نتایج جستجو برای: thunderstorm
تعداد نتایج: 1141 فیلتر نتایج به سال:
This paper describes a comparative analysis of the thunderstorm incidence in southeastern Brazil obtained from thunderstorm days observed at two different epochs (from 1910 to 1951 and from 1971 to 1984) and from lightning data provided by the Brazilian lightning location system RINDAT (from 1999 to 2006) and the Lightning Imaging Sensor (LIS) on board the Tropical Rainfall Measuring Mission (T...
In India, Kerala state is known to have relatively high lightning incidence. The nature of spatial and temporal distribution of past incidents, type of thunderclouds which cause lightning, the topography, proximity to a mountain range and sea point to the possibility of the mountain weather aiding in Cb formation. For investigating the role of mountain weather in convective Cb formation a field...
Weather monitoring systems, such as Doppler radars, collect a high volume of measurements with fine spatial and temporal resolutions that provide opportunities to study many convective weather events. This study examines the spatial and temporal characteristics of severe thunderstorm life cycles in central United States mainly covering Kansas, Oklahoma, and northern Texas during the warm season...
The objective of this paper is to show that observations of total lightning activity provide significant benefits for thunderstorm nowcasting problems. For the purposes of this paper, the term “total lightning activity” refers to the combination of in-cloud (IC) and cloud-to-ground (CG) lightning flashes. We focus on a couple of key nowcasting issues in this paper: (1) thunderstorm growth and d...
We present measured radio emission from cosmic-ray-induced air showers under thunderstorm conditions. We observe for these events large differences in intensity, linear polarization and circular polarization from the events measured under fair-weather conditions. This can be explained by the effects of atmospheric electric fields in thunderclouds. Therefore, measuring the intensity and polariza...
The importance of narrow zones of boundary layer convergence (or boundaries) for thunderstorm development and evolution has been recognized since the days of the Thunderstorm Project. Boundary detection and characterization are primary objectives of automated nowcasting systems, which employ surface data, radar and satellite observations of current storms and trends in their intensity to foreca...
Convectively-induced turbulence (CIT) is one of several threats that requires aircraft to avoid thunderstorms in order to mitigate the risk of passenger injury or aircraft damage. Current Federal Aviation Administration (FAA) thunderstorm avoidance guidelines proscribe flight within 20 nautical miles of a thunderstorm, above thunderstorm tops or beneath anvils. In practice, interpretation of th...
OBJECTIVE To determine the frequency of nonspecific clinical signs in dogs with separation anxiety, thunderstorm phobia, noise phobia, or any combination of these conditions and determine whether these conditions are associated in dogs. DESIGN Case series. ANIMALS 141 dogs. PROCEDURE Diagnoses were established using specific criteria. Owners of dogs completed a questionnaire on how freque...
Tornadoes, which are one of the most feared natural phenomena, present a significant challenge to forecasters who strive to provide adequate warnings of the imminent danger. Forecasters recognize the general environmental conditions within which a tornadic thunderstorm, called a supercell thunderstorm, will form. They also recognize a supercell thunderstorm with its rotating updraft, or mesocyc...
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