Mesoscale Processes and Severe Convective Weather Section 3.5 a,b Richard H. Johnson and Brian E. Mapes Presented to you by: Elizabeth Polito.

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Presentation transcript:

Mesoscale Processes and Severe Convective Weather Section 3.5 a,b Richard H. Johnson and Brian E. Mapes Presented to you by: Elizabeth Polito

Talk Overview Storm-Generated Mesoscale Processes –Local Effects –Advective Effects Examine/breakdown 6 schematics

Storm-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 advective

Storm-Generated Mesoscale Processes Terrance will discuss these processes

Local 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/RFD Advective Effects: Cold Pools

Tornado family formation Advective Effects

Advective Effects: Advection of Condensate

Note vertically sheared environment –Vertical vorticity couplets Advective Effects: Vortex Tilting

Advective Effects: Vortex Tilting Example: Bow Echo

Takes place in storm itself –Front-to-rear –Rear-to-front Advective Effects: Vortex Tilting