mesoscale processes and severe convective weather section 3.5 a,b richard h. johnson and brian e....
Post on 21-Dec-2015
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Mesoscale Processes and Severe Convective
WeatherSection 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
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
• Note vertically sheared environment– Vertical vorticity
couplets
Advective Effects: Vortex Tilting