<pre>ACUS11 KWNS 012038 SWOMCD
Mesoscale Discussion 0978 NWS Storm Prediction Center Norman OK 0337 PM CDT Sun Jul 01 2018
Areas affected…North and Central Illinois into Northwest Indiana.
Concerning…Severe Thunderstorm Watch 253…
Valid 012037Z – 012200Z
The severe weather threat for Severe Thunderstorm Watch 253 continues.
SUMMARY…A line of storms moving across northern and central Illinois continues to pose a severe weather threat. The primary threat from these storms will be damaging winds.
DISCUSSION…The line of storms which has formed across northern and central Illinois has not produced much severe weather up to this point. 0 to 6 km shear (20 kts per the LOT 20Z VWP and 15 kts per the 19Z ILX sounding) remains weak, however, strong buoyancy (2500 to 3000 MLCAPE on RAP mesoanalysis) ahead of this line will continue to support some severe weather threat through the afternoon and into the evening. The primary severe threat will remain damaging wind gusts due to downward momentum transfer of 30 to 40 knots of flow around 1 km above the surface (LOT 20Z VWP).
..Bentley.. 07/01/2018
…Please see www.spc.noaa.gov for graphic product…
ATTN…WFO…IWX…IND…LOT…ILX…MKX…LSX…DVN…
LAT…LON 42498939 42478705 40918692 39178759 38888831 38748914
38728958 38969014 39199059 39579067 40039060 40638994 41718936 42498939 </pre>
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