Monday, March 6, 2017

Severe Weather Outlook for Mchenry Co., IL

ACUS11 KWNS 070416
SWOMCD

Mesoscale Discussion 0267
NWS Storm Prediction Center Norman OK
1015 PM CST Mon Mar 06 2017

Areas affected...southeastern Wisconsin and portions of northern
Illinois

Concerning...Severe potential...Watch likely

Valid 070415Z - 070515Z

Probability of Watch Issuance...80 percent

SUMMARY...Expansive line of strong to severe thunderstorms will
approach the discussion area within the next 1-2 hours. A lingering
damaging wind threat may exist with these storms.

DISCUSSION...Ongoing line of strong to severe storms persists from
central Wisconsin (near CWA) south-southwestward to near BRL in
western Illinois and into far northeastern Missouri. These storms
were in a strongly sheared, but weakly to moderately unstable
environment, leading to several bow/LEWP-type signatures. Multiple
wind/hail reports have been received with this activity throughout
the evening along with a few tornado reports.

With time, these storms should reach the eastern portions of WW 65
(in southern Wisconsin) around 0430-0500Z and reach eastern portions
of WW 66 (in northern Illinois) by around 0445-0515Z. They will
continue to pose a wind and tornado threat until then, but
diminishing instability with eastward extent should act to mitigate
the severe threat. Trends will be monitored for any lingering
threat, which may necessitate a severe thunderstorm watch issuance.

..Cook/Guyer.. 03/07/2017

...Please see www.spc.noaa.gov for graphic product...

ATTN...WFO...LOT...ILX...MKX...DVN...

LAT...LON 43328945 43548924 43578895 43448869 42978858 41928830
40978819 40298819 40068854 40118904 40508936 41038945
41848939 42168936 43328945

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