- A Flash Flood Watch will be in effect from 4 PM Thursday through 7 AM Friday morning for Knox, Lewis, Marion, Monroe, Ralls and Shelby County in MO and Adams County in IL.
We are at the beginning stages of what will become a very busy pattern with showers and thunderstorms. This includes the potential for strong to severe storms. Along with the chance of flash flooding.
Thunderstorms have been rolling through the Tri-States through the morning hours and this will continue into the early afternoon hours. These storms are not severe but have been producing very heavy downpours, frequent lightning and thunder and gusty winds. These storms could also produce some small hail. After those storms clear out, we'll have a brief break in the action.
Some of the clouds out to our west should start to break apart, which will lead to the atmosphere destabilizing. That means, the atmosphere will be getting ready for another round of storms and these are the storms that could be strong to severe. Another thunderstorm complex will develop to our west and then will move into the Tri-States. The next round, models have different times of when the storms will start. Some storms could fire as early as 4 PM but the better chance will be later tonight and into the overnight hours while you're sleeping. The primary threat will be strong damaging wind gusts and flash flooding. I can't rule out a few isolated tornadoes and some hail though.