UIUC ATMS 100 - Thunderstorm Complexes (3 pages)

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Thunderstorm Complexes

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Thunderstorm Complexes


Brief overview of downbursts and mesoscale structure and development.

Lecture number:
Lecture Note
University of Illinois at Urbana, Champaign
Atms 100 - Introduction to Meteorology

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Lecture 22 Outline of Last Lecture I Thunderstorms II Thunderstorm Ingredients Instability III Thunderstorm Ingredients Trigger IV Trigger Front or Dryline V Trigger Sea Breeze Lake Breeze VI Trigger Mountains VII Thunderstorm Ingredients VIII Severe Thunderstorms IX Types of Thunderstorms X Ordinary Thunderstorms XI Ordinary Thunderstorms Stage Development XII Cumulus Stage XIII Mature Stage XIV Outflow XV Dissipation Stage Outline of Current Lecture XVI XVII What is a Downburst Downburst Formation ATMS 100 1st Edition XVIII Straight Line Winds XIX Wind Damage XX Mesoscale Convective XXI MCS Lifecycle XXII Stratiform Precipiation XXIII MCS Dissipation XXIV MCS Structure XXV MCS Structure Updraft XXVI MCS Structure Rear Inflow Jet XXVII Vertical Wind Shear XXVIII The Role of Wind Shear XXIX Shelf Cloud XXX Bow Echoes Current Lecture XXXI What is a Downburst i a downburst is a strong updraft that comes in contact with the ground 1 sinking air must be colder than the air around it ii microbursts are smaller and often more intense downbursts XXXII Downburst Formation a rain drags air downward with it b rain falls into unsaturated air and evaporates i cooling the air ii cold air sinks c downbursts can sink as fast as 40 50 mph i aviation hazard XXXIII Straight Line Winds a straight line winds often result after downburst reaches the ground b straight line winds are intense winds blowing in the same direction over an area i different from a tornado because winds in tornadoes rotate c straight line winds can reach 100 mph d all the debris fall in the same direction XXXIV Mesoscale Convective a abbreviated MCS b an MCS is a large complex of thunderstorms i can cover an entire state c produce a lot of rainfall i important for the agricultural midwest d hazards include flooding straight line winds and the occasional weak tornado XXXV MCS Lifecycle a an MCS generally begins as a cluster of scattered thunderstorms b new thunderstorms initiate along the gust of fronts of the

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