Topic
Convective available potential energy
About: Convective available potential energy is a research topic. Over the lifetime, 936 publications have been published within this topic receiving 43773 citations. The topic is also known as: CAPE.
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TL;DR: In this paper, the sensitivity of the Madden-Julian Oscillation (MJO) simulation to convective downdrafts is examined using the NCAR-Community Atmosphere Model version 3 (CAM3).
9 citations
TL;DR: In this article, the thermodynamical and microphysical response during the transition from southwest to northeast monsoon season is studied, where mixed phase cloud observations from the Cloud Aerosol Interaction and Precipitation Enhancement Experiment (CAIPEEX) and ground based observations from Integrated Ground Observation Campaign (IGOC), high resolution (3 km) mesoscale forecasts with the nested Weather Research and Forecasting (WRF) model are used in the study.
9 citations
TL;DR: In this article, the authors developed a statistical guidance product, the tropical cyclone tornado parameter (TCTP), for forecasting the probability of one or more tornadoes during a 6-h period that are associated with landfalling tropical cyclones affecting the coastal Gulf of Mexico and the southern Atlantic coast.
Abstract: The authors develop a statistical guidance product, the tropical cyclone tornado parameter (TCTP), for forecasting the probability of one or more tornadoes during a 6-h period that are associated with landfalling tropical cyclones affecting the coastal Gulf of Mexico and the southern Atlantic coast. TCTP is designed to aid forecasters in a time-limited environment. TCTP provides a “quick look” at regions where forecasters can then conduct detailed analyses. The pool of potential predictors included tornado reports and tropical cyclone data between 2000 and 2008, as well as storm environmental parameters. The original pool of 28 potential predictors is reduced to six using stepwise regression and logistic regression. These six predictors are 0–3-km wind shear, 0–3-km storm relative helicity, azimuth angle of the tornado report from the tropical cyclone, distance from the cyclone’s center, time of day, and 950–1000-hPa convective available potential energy. Mean Brier scores and Brier skill scores a...
9 citations
TL;DR: In this paper, three-dimensional numerical simulations were performed to evaluate potential southwestern U.S. dust indirect micro-physical and direct radiative impacts on a real severe storms outbreak.
9 citations
TL;DR: In this article , the authors systematically examined whether different meteorological processes are at play in winter and found physically meaningful groups in ERA5 atmospheric reanalysis data and lightning data for northern Germany, and two thunderstorm types emerged: wind-field and convective available potential energy (CAPE) thunderstorms.
Abstract: Abstract. Lightning in winter (December–January–February, DJF) is rare compared to
lightning in summer (June–July–August, JJA) in central Europe north of
the Alps. The conventional explanation attributes the scarcity of lightning
in winter to seasonally low values of variables that create favorable conditions in summer. Here we systematically examine whether different meteorological processes are at play in winter. We use cluster analysis and principal component analysis and find physically meaningful groups in ERA5 atmospheric reanalysis data and lightning data for northern Germany. Two thunderstorm types emerged: wind-field thunderstorms and CAPE (convective available potential energy) thunderstorms. Wind-field thunderstorms are characterized by increased wind speeds, high cloud shear, large dissipation of kinetic energy in the boundary layer, and moderate temperatures. Clouds are close to the ground, and a relatively large fraction of the clouds are warmer than −10 ∘C. CAPE thunderstorms
are characterized by increased convective available potential energy (CAPE), the presence of convective inhibition (CIN), high temperatures, and accompanying large
amounts of water vapor. Large amounts of cloud-physics variables related to
charge separation such as ice particles or cloud base height further
differentiate both wind-field thunderstorms and CAPE thunderstorms.
Lightning in winter originates in wind-field thunderstorms, whereas lightning
in summer originates mostly in CAPE thunderstorms and only a small fraction
in wind-field thunderstorms.
Consequently, typical weather situations of wind-field thunderstorms in the
study area in northern Germany are strong westerlies with embedded cyclones. For CAPE thunderstorms, the area is typically on the anticyclonic side of a southwesterly jet.
8 citations