Mesoscale Processes and Severe Convective Weather Section 3.5 a,bTalk OverviewStorm-Generated Mesoscale ProcessesSlide 4Local EffectsAdvective Effects: Cold PoolsPowerPoint PresentationSlide 8Slide 9Slide 10Slide 11Slide 12Slide 13Slide 14Slide 15Mesoscale Processes and Severe Convective WeatherSection 3.5 a,bRichard H. Johnson and Brian E. MapesPresented to you by: Elizabeth PolitoTalk Overview•Storm-Generated Mesoscale Processes–Local Effects–Advective Effects•Examine/breakdown 6 schematicsStorm-Generated Mesoscale Processes•Encourage storm development, severity, longevity –Cold pool lifting–Vortex tilting/stretching• Weaken Storm–Rapid spreading of cold pools–Cloud shading•Discuss processes in terms of being local or advectiveStorm-Generated Mesoscale ProcessesTerrancewill discusstheseprocessesLocal Effects•Radiation–Timescales• ~1-2 h - not important in evolution but maybe in new development•~6-12 h - MCSs timescale: cloud-radiative interactions aid in longevity (through mass circulation build up)–Increase total precipitation •Microphysical Processes (phase changes or particle evolution)–Cold pool production–MCSs–Microbursts•Cold Pools•Downdraft outflows–FFD/RFDAdvective Effects: Cold Pools•Tornado family formationAdvective EffectsAdvective Effects: Advection of Condensate•Note vertically sheared environment–Vertical vorticity coupletsAdvective Effects: Vortex TiltingAdvective Effects: Vortex TiltingAdvective Effects: Vortex TiltingAdvective Effects: Vortex Tilting Example: Bow Echo•Takes place in storm itself–Front-to-rear–Rear-to-frontAdvective Effects: Vortex TiltingAdvective Effects: Vortex TiltingAdvective Effects: Vortex