12:00 am June 23: Severe storms have pushed out of the Stateline, but flooding is on-going after 2" to 4" of rain fell during the severe storms. Many roads and intersections are flooded in Lee and southern DeKalb counties. Flood Warnings are in effect until 5:45 am for these locations. Remember, do not drive into flooded roads! You cannot tell how deep the flood waters are, or if the road bed is still in place while driving, so find a different route.
Dry weather moves in overnight, so flash flooding should be short-lived. Stay with 13 WREX for updates.
8:00 pm: Severe thunderstorms with the capability of producing a tornado, large hail, and very heavy rainfall are moving through Lee County now. In addition, Whiteside and Lee Counties are under a Flash Flood Warning until 1:30 a.m. These storms are capable of producing between 2" to 3" of rain in a brief amount of time. Monitor small streams and rivers for rapid rises in the water level, and do not drive into flooded roads or intersections! This is very dangerous; find a different route if you encounter a flooded road.
The severe weather threat is slowly subsiding, but the threat for flash flooding will continue for the next several hours. Thunderstorms in general will move through the Stateline within the next few hours, and exit before midnight.
4:00 pm: A Tornado Watch is in effect for Ogle, Lee, Carroll, Whiteside, and DeKalb counties in northern Illinois until 11 pm this evening. A few tornadoes are possible as storms develop and intensify in Iowa, then move east into the Stateline this evening. In addition to the tornado threat, damaging winds between 60 and 75 mph and large hail up to 2" in diameter are possible as well.
The storms will develop along a cold front coming in from western Iowa. The cold front is moving into a very warm and humid atmosphere located in central Iowa and Illinois, providing plenty of instability to create dangerous thunderstorms. We also have shifting winds thanks to outflow from the thunderstorms this morning, providing the necessary shear or "twist" in the atmosphere to create rotating thunderstorms and tornadoes.
The storms should start to enter the picture between 5 pm and 7 pm this evening, and persist until 10 pm tonight, when the cold front exits. Be on high alert for changing weather, and stay up-to-date with 13 WREX throughout the evening. Strong to severe thunderstorms are possible along this cold front across the rest of the Stateline in Jo Daviess, Stephenson, Winnebago, and Boone Counties, but the highest risk for severe weather and tornadoes will be in the area under the Tornado Watch.
12:30 pm: Leftover showers and thunderstorms from this morning's thunderstorms complex will continue early this afternoon. Strong to severe weather has pushed east out of the Stateline, but more severe weather is possible later this evening.
Starting around 5 pm, strong to severe storms will develop along a cold front as it moves into northern Illinois. These storms may bring strong, damaging winds gusts, with large hail also possible. Early in this round of storms, there is a low risk for tornadoes, but that risk diminishes as the storms evolve and the damaging wind gust threat takes over.
Stay alert this afternoon, and continue to check in with 13 WREX for updates.
10:45 am: Strong thunderstorms bringing damaging wind gusts and heavy rainfall are moving through the Stateline now. Wind gusts of 60 mph or greater are possible with this line of thunderstorms. Move indoors and away from windows if in Winnebago, Ogle, and Boone Counties.
Once this line of thunderstorms whips through within the next hour, we should see moderate to occasionally heavy rainfall into early afternoon.
Severe weather is still possible this evening as the atmosphere resets this afternoon and a cold front moves through northern Illinois. Significant wind gusts and large hail are possible, with a low tornado risk. Stay with 13 WREX through the evening for updates, and stay alert for threatening weather.
Severe thunderstorm activity is possible today. We'll start off with the threat in the late morning and early afternoon.
A cluster of thunderstorms known as an MCS (mesoscale convective system) that has moved from South Dakota, through southern Minnesota and Iowa, and is now in northeastern Iowa and southeastern Wisconsin. It has been firing up severe thunderstorms throughout the overnight hours and into the morning.
This system is moving into the Stateline area by the late morning and early afternoon, enhancing our risk for severe thunderstorm activity. This is moving into a very moist and somewhat unstable environment, and I think the main threat will be damaging winds, with large hail closely behind that.
Reports in Iowa are showing winds as high as 80 mph, as well as golf ball sized hail with some of these thunderstorms. With that being said, in the early afternoon we are looking at adding wind shear to our moist and somewhat unstable environment, this will give us a low threat for tornadoes.
Winds will be pushing out of the south, and changing in direction with height.
We'll work in another threat of severe activity in the late afternoon and evening, as a trailing cold front marches across the Stateline. Damaging winds and large hail will be the main threat, though all hazards are possible including tornadoes.
Stick with us throughout the day on air, online, and on our Facebook page for the latest updates.