Mesoscale Discussion concerning Severe Thunderstorm Watch 138
The National Storm Prediction Center has issued a Mesoscale Discussion indicating a continued risk of severe thunderstorms well south of Chicago in Kankakee and Iroquois Counties in northeast Illinois and counties in Northwest Indiana – so the Severe Thunderstorm watch will continue until at least 10PM CDT.
Following is the Mesoscale Discussion Issued…
Concerning...Severe Thunderstorm Watch 138... Valid 110158Z - 110300Z The severe weather threat for Severe Thunderstorm Watch 138 continues. SUMMARY...A lingering threat for isolated hail/wind will persist across the discussion area through at least 03Z. DISCUSSION...Scattered thunderstorms continue to persist across the discussion area at this time. Some of the storms have recently exhibited weak rotation over the past 1-2 hours - especially in eastern Illinois and northwestern Indiana. Hail (locally exceeding 1 inch in diameter) remains the biggest threat with this activity given weak to moderate instability and cold (-16 to -18C at 500mb) temperatures aloft. An isolated wind gust also cannot be completely ruled out with stronger storms. The ongoing WW (138) expires at 03Z. It appears possible that an isolated hail/wind threat may exist beyond this expiration time, which may require local temporal extensions of the watch.