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Transcript 
Extreme Precipitation in
Minnesota 10 – 11 August 2016
Wesley James
Motivation
• Relate key concepts learned
in class to a slow propagating
convective line
• Discover the synoptic and
mesoscale setup which would
allow for 175mm of
precipitation in 24 hours
Methodology
• Veering winds removes the
downdraft from the updraft
• Upper level winds are east-west,
same as the initial convection
• This spawns convection near the
origin of existing convection
• Rear flank cold front forcing for new
development
(Maddox et al. 1979)
35kt @ 850mb
30kt @ 850mb
• Rear flank is left exposed to influx
of warm moist air
Methodology Continued
WPC surface analysis
0127 UTC 11 Aug
Schumacher and Johnson (2005)
NEXRAD-college of DuPage
Conclusion
• Referencing similar analysis from
Maddox et al. (1979) and Schumacher
and Johnson (2005) we see a case
resembling a perfect scenario for back
building precipitation. (Duration)
• Upper level Divergence and large
instability allotted for intense
convection and precipitation (Rate)
• P=R*T
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