|Mesoscale Discussion 1066|
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Mesoscale Discussion 1066
NWS Storm Prediction Center Norman OK
0135 AM CDT Sat Jun 17 2017
Areas affected...Southern WI...eastern IA...and northwest and
Concerning...Severe Thunderstorm Watch 342...
Valid 170635Z - 170830Z
The severe weather threat for Severe Thunderstorm Watch 342
SUMMARY...Although a locally strong wind gust cannot be ruled out,
the overall severe-weather threat should continue to diminish during
the overnight. Parts or much of WW 342 could be canceled prior to
10Z (5 AM).
DISCUSSION...Radar trends (including MRMS MESH and 7- and 9-km
CAPPI) indicated overall weakening storm intensities with the
ongoing convection across southern WI, much of eastern IA into
western and northern portions of IL during the last 1-2 hours. This
weakening trend was further confirmed by decreasing lightning
coverage within this activity. The combination of convective
overturning of the environment and strengthening surface-based
inhibition through the night provides limited ability for stronger
storms to develop as this area of showers and embedded thunderstorms
spreads to the east-southeast. Veering 850-mb winds will also limit
convergence, with last several runs of the HRRR suggesting the
ongoing weakening trend in storm intensity and coverage will persist
as showers and some storms advance farther east-southeast into
northern IL during the night and early morning.
...Please see www.spc.noaa.gov for graphic product...
LAT...LON 41699217 41829115 42609052 43208971 43208847 43238783
42518776 41958810 41048923 40809028 40829056 41109124
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