National Weather Service United States Department of Commerce

Overview

A complex of thunderstorms produced damaging wind in a swath from southern Montgomery county and northern Putnam county through the Interstate 74 corridor into Ohio before gradually weakening as it moved into northern Kentucky and West Virginia. The peak measured wind gust was 68 mph at the Crawfordsville AWOS with pockets of higher end damage across far southeastern Marion county and far northwestern Shelby county.  Later in the evening, a rogue thunderstorm along the front produced a landspout that moved from Illinois into Warren county causing no damage.

 

 

Environment

Thunderstorms began shortly after 2 PM with a marginal CAPE and shear environment during the course of the storms.  The biggest hinderance to the mixing down of the very strong rear inflow jet winds was the low level lapse rates being less than moist adiabatic.  Had the lapse rates been a bit higher, this system would likely have produced much more widespread 60-80 mph winds based on the strength of the cold pool.

Environment - Visible Satellite Image at 2:00 PM EDT Environment - Mixed Layer CAPE at 3:00 PM Environment - 0-3km lapse rate and low level CAPE at 3 PM
Figure 1: Bulk Shear at 4:00 PM EDT Figure 2: Mixed Layer CAPE at 4:00 PM EDT Figure 3: 0-3km Lapse Rate at 4:00 PM EDT


The intersection of the outflow boundary created by the earlier thunderstorms and the arriving front created a narrow window with a higher Enhanced Stretching Potential parameter as seen in figure 4 below.  This favorable environment produced a weak landspout that caused no damage across Warren county.

Environment - Downdraft CAPE at 3 PM
Figure 4: Enhanced Stretching Potential Parameter at 8:00 PM EDT


 


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