[12:10AM] Lingering storms remain in Eastern Walworth County, but we are severe storm free now. Likely, much of the night ends up dry, with increasing thunderstorm chances again Monday evening. Flash flood warning for Lee County remains in effect until 1:15AM, but rain is finished there for now.
[10:50PM] The Tornado Warning for Lee County has been canceled.
[10:25PM] The initial tornado warning that had been issued for Lee County has expired at 10:30pm, but a new tornado warning is now in effect for eastern Lee County until 11:30pm. This storm is currently moving towards I-39. The rotation within the storm has broadened out a bit, but still capable of producing a tornado. Heads up if you are in the Paw Paw area as the main area of location is now over Compton, heading towards Paw Paw. Localized flooding is also possible with a Flash Flood Warning in effect until 1:15am for eastern Lee County.
[10:05PM] Tornado warning continues for Lee County IL until 10:30PM. Mid-level rotation remains strong over Shaws, and a tornado could develop at any time. Storm is moving East at 20 mph. Seek shelter now if you're near Shaws, Brooklyn, or Compton!
[9:50PM] A tornado warning has been issued for Central Lee County until 10:30PM. This storm has been elevated but is right along the warm front, helping to enhance some rotation. This part of the storm is moving East at 20-25 mph.
[9:40PM] A new severe thunderstorm warning has been issued for Lee County until 10:45PM. These storms are capable of producing 60 mph wind gusts, quarter sized hail, and very heavy rainfall as they track East at 15 mph. Be on the lookout for flooded roads, as 1.5-2" of rain has already fallen in spots!
[9:35PM] New cells are developing West of the current severe warned storm in Lee County. With cells that train, or track over the same areas, we could see enhanced flash flood potential. Very heavy rainfall rates and slow movements have already allowed for over 1" of rain to fall in some spots. Watching very closely over the next 30 mins to an hour for flooding threats in Central/Eastern Lee County. If you come across any flooded roads, be sure to turn around!
[9PM] All of Northern Illinois is now under a severe thunderstorm watch until 4AM. Storms have begun developing along the previous outflow boundary, including the severe thunderstorm warning for Lee County. Along and North of the boundary closer to I-80, storms will likely be elevated in nature, limiting the tornado threat. Hail and damaging winds will be the primary concerns with any severe storms locally.
[8:50PM] A severe thunderstorm warning has been issued for Lee County in Northern Illinois until 9:45PM. This storm is capable of producing half dollar sized hail and gusty winds under 50 mph. Storm motion is only 15 mph to the East, so very heavy rainfall will also be a concern. Take shelter if you are within this warning!
While most of the Stateline did not see the strong storms or heavy rain from the midday round of activity, another round may still develop later tonight, likely along the outflow/effective warm front from the previous round of storms.
The more favorable environment for strong to severe storms remains near and South of I-88 Sunday evening. Elevated storms remain below severe limits along the I-39 corridor in Northern Illinois and Southern Wisconsin but are within the less favorable environment. With little daytime heating left, I don't expect that front to lift much further North than I-88.
The evening storms will likely develop along this front after 7-8PM, producing the potential for heavy rain, gusty winds, and small hail. The strongest storms may produce some instances of damaging wind gusts, but this would be rather isolated in nature. I suspect some, if not most locations in the Stateline will remain dry tonight.
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