Mesoscale Processes and Severe Convective Weather Section 3.5 a,b Richard H. Johnson and Brian E....

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

Storm-Generated Mesoscale Processes

Terrancewill discusstheseprocesses

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


Mesoscale Processes and Severe Convective Weather Section 3.5 a,b Richard H. Johnson and Brian E....

Documents

Transcript of Mesoscale Processes and Severe Convective Weather Section 3.5 a,b Richard H. Johnson and Brian E....