[12:25AM] A severe thunderstorm warning has been issued for Green and Western Rock Counties in Southern Wisconsin until 1:30AM. These storms are capable of producing 60 mph wind gusts and penny sized hail as they move East at 60 mph. A tornado is also possible, but not imminent at this time.
[12:15AM UPDATE] Storms have moved into SW Wisconsin with a few areas of rotation and associated tornado warnings. Storms are generally moving East at around 30 mph. Additional cells have begun producing lightning in NW Illinois in a more isolated fashion. Weakening trends will continue with Eastward extent, but it is unclear how quickly they will weaken. Right now, the highest chance for anything severe over the next few hours is primarily across Southern Wisconsin, but far Northern Illinois may get clipped by a strong storm or two. Highest threats will remain with damaging wind gusts, followed by very isolated spin-up tornadoes, then small hail.
[10:45PM UPDATE] A severe thunderstorm watch has been issued for Northwestern parts of the Stateline until 5AM Saturday. Storms out in Iowa have been holding together to an extent as they move East with a few severe warnings along the line. Primary threats would be damaging wind gusts and some instances of small hail. Our primary storm window will be through 2-3AM, exiting East after 3-4AM.
Scattered storms have developed in Iowa with several severe thunderstorm warnings. This line of storms will continue to progress Eastward, reaching NW Illinois after 10-11PM. Storms will be on a weakening trend but could still produce some damaging wind gusts and hail.
The current late evening SPC outlook has expanded the Level 2/5 Slight risk further East across a large portion of the Stateline now. Storms will be possible from 11PM-3AM, so be sure to have ways to get warnings should any be issued that late!
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