A TORNADO WATCH has been issued for the following counties until 10pm Tuesday: Winnebago, Boone, McHenry, Ogle, Lee, DeKalb, and Whiteside. Very large hail up to baseball sized, isolated tornadoes, and strong winds will be possible.
Low pressure located across northern Missouri will move to the northeast through sunset. As it does, a boundary defined by higher moisture will also move to the northeast. Thunderstorms are likely to develop southwest of Rockford, near Whiteside and Lee counties, over the next couple of hours. Additional thunderstorms may form over portions of Ogle and DeKalb counties by 5pm-6pm. These storms could be capable of producing large hail. The tornado threat during this time is low, but it is there. That tornado threat will increase after sunset, most likely to the south of the viewing area, but locations near I-88 will need to be monitored closely this evening.
A strong cold front coming in tonight will cause temperatures to drop quickly, but also bringing an end to our severe weather threat by 9pm/10pm.
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