I witnessed the group of thundershowers which caused plenty of straight-line
wind damage from downbursts across southern Michigan the morning of July 16,
1980 (or was it the 15th?). That was the most damage I witnessed, though the
"sickest" one would probably be late morning of December 17, 2000 in Mount
Poocno. A band of warm & moist southerly flow ahead of a cold front caused
thundershowers with the period of heaviest rain I ever saw. I did not observe
exactly how much rain occurred during the heaviest period (manual gauge), but
I recall it was approximately an inch & a half during 40 minutes to an hour.
The daily amount was 3.53 inches - almost all during morning. The rain was
so heavy for awhile that water gushing down the street tore away large pieces
of asphalt. The roads has about a 20-25° grade though, and the ground under
the road is generally inconsistent - so the asphalt does tend to rip away with
snowplows, etc. The event ended with a period of light snow that evening
& early night which accumulated to .3 inches over wet ground to begin with
though with temperatures of high-mid 20's.


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