MD 1508 CONCERNING TORNADO WATCH 477… FOR NORTHEASTERN ILLINOIS…NORTHERN ILLINOIS…MICHIGAN
Mesoscale Discussion 1508
NWS Storm Prediction Center Norman OK
0702 PM CDT Wed Jul 12 2023
Areas affected...Northeastern Illinois...Northern
Illinois...Michigan
Concerning...Tornado Watch 477...
Valid 130002Z - 130100Z
The severe weather threat for Tornado Watch 477 continues.
SUMMARY...Tornado threat continues within WW477.
DISCUSSION...Confirmed tornadoes were have occurred across northern
Illinois in the last hour. Surface objective analysis indicates
200-300 m2/s2 effective SRH near a lifting warm front located across
northern Illinois near the Chicago metro. A low-level jet axis of
30-35 kts extends across north Central Illinois and will gradually
shift eastward across Lake Michigan northern Indiana/ Michigan
through the next few hours. The threat area will likely also shift
eastward through time as this occurs. A downstream watch may be
needed in the next couple of hours.
..Thornton/Guyer.. 07/13/2023
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...IWX...GRR...LOT...
LAT...LON 42278729 42218694 42188653 42058611 41988594 41788581
41608576 41438581 41268603 41208624 41188638 41208660
41248693 41268707 41268718 41308759 41328781 41388803
41508829 41708839 41878834 42008832 42118824 42228817
42308808 42338796 42328769 42298741 42278729
