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14: Thunderstorm Fundamentals

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    Thunderstorm characteristics, formation, and forecasting are covered in this chapter. The next chapter covers thunderstorm hazards including hail, gust fronts, lightning, and tornadoes.

    • 14.1: Thunderstorm Characteristics
      This page covers various aspects of thunderstorms, including their formation, characteristics, and types such as supercells and multicell storms. It describes the structure and dynamics of thunderstorms, detailing stages of development, associated cloud types like mammatus, and safety for storm chasers. The dynamics of mesoscale convective systems (MCS) are explained, including squall lines and bow echoes.
    • 14.2: Thunderstorm Formation
      This page covers the conditions for severe thunderstorm formation, emphasizing humidity, instability, wind shear, and lift mechanisms. It details key altitudes and the dynamics of air parcel ascent, including convection dynamics. Additionally, it examines the thermodynamic properties related to cloud formation and includes calculations of specific pressures associated with thunderstorms.
    • 14.3: High Humidity in the ABL
      This page explores the conditions for convective storms, particularly thunderstorms, emphasizing high humidity's role in the atmospheric boundary layer (ABL) as fuel for these storms. It introduces meteorological concepts like mixing ratio and lifting condensation levels to assess storm intensity.
    • 14.4: Instability, Cape and Updrafts
      This page covers the requirements for convective storm formation, emphasizing nonlocal conditional instability (NCI) and the role of capping inversions in trapping warm, humid air. It introduces Convective Available Potential Energy (CAPE) and its various estimations—Surface-Based, Mean Layer, and Most Unstable CAPE—along with their importance in predicting storm intensity and tornado likelihood.
    • 14.5: Wind Shear in the Environment
      This page covers essential meteorological concepts related to thunderstorms, focusing on wind shear and hodographs. It details how wind shear influences storm formation and behavior, highlights safety guidelines for storm chasing, and explains the classification of storm types using parameters like the Bulk Richardson Number (BRN) and CAPE values. Additionally, it discusses the significance of effective layer and effective bulk shear in predicting supercell behavior.
    • 14.6: Triggering VS. Convective Inhibition
      This page explains the conditions necessary for thunderstorm formation, emphasizing the importance of a trigger mechanism to lift air parcels, along with humidity, instability, and wind shear. It discusses the role of convective inhibition (CIN) in resisting uplift, detailing how various external triggers can overcome this barrier. Mechanisms such as weather fronts, sea breezes, and orographic lifting are highlighted, alongside the importance of reaching the convective temperature.
    • 14.10: Homework Exercises
      This page covers exercises and analysis related to thunderstorms, focusing on research, practical applications, and theoretical concepts. Key tasks include understanding storm dynamics, calculating shear and wind characteristics, and predicting intensities based on atmospheric conditions. Various atmospheric factors influencing thunderstorm formation, such as humidity and shear, are examined.
    • 14.7: Thunderstorm Forecasting
      This page covers the complexities of forecasting thunderstorms, emphasizing their nonlinear and unpredictable nature, with a focus on their peak occurrence in the afternoon. Severe storms in the U.S. are classified by hazards, utilizing alert systems for public safety.
    • 14.8: Storm Case Study
      This page details the severe storm event of May 24, 2006, focusing on the US National Weather Service's weather maps and forecasting data. It explains how warm, humid air from the Gulf of Mexico interacted with cold fronts in Texas, prompting warnings from the US Storm Prediction Center for the Midwest. A radar image shows the squall line's path, resulting in multiple storm reports, including tornadoes and hail, leading into a discussion on the hazards associated with thunderstorms.
    • 14.9: Review
      This page discusses thunderstorms, highlighting their distinctive shapes and intensity as convective clouds, particularly focusing on supercells with mesocyclones. It outlines the four key conditions for formation: high humidity, instability, wind shear, and a lifting trigger, and mentions the use of thermodynamic diagrams for forecasting.

    This page titled 14: Thunderstorm Fundamentals is shared under a CC BY-NC-SA 4.0 license and was authored, remixed, and/or curated by Roland Stull via source content that was edited to the style and standards of the LibreTexts platform.