4:45 p.m. update: Severe weather threat has decreased. The watch is cancelled.
Updated: 4:45 p.m. July 27, 2026
The severe weather threat has diminished this late afternoon. Strong to severe storms that produced damaging winds and hail have weakened. The atmosphere is worked over and the necessary ingredients for more storms have eroded.
The severe thunderstorm watch has also been cancelled early with the lack of storms expected to develop.
Milwaukee did break the record rainfall for today which was 1.50" for today's date in 2011 and today we picked up 1.75"
____________________________________________________________________________________________________________
Updated: 3:30 p.m. July 27, 2026
The severe thunderstorms continue to march south within the severe thunderstorm watch. Damaging winds and large hail remain possible.
The storm near Oconomowoc continues to show a supercell feature. Rotation remains broad; however, we will continue to watch it closely. Storms should be exiting the area by the early evening.
___________________________________________________________________________________________________________
Newly issued Severe thunderstorm warning for Milwaukee and Waukesha counties until 3:30pm Brace for potential winds to 60mph and quarter size hail. Storm is dropping south at 20mph.
Updated: 12:49 p.m. July 27, 2026
A tornado warning has been issued for parts of southeast Wisconsin until 1:30 p.m. on Monday, July 27.
Updated: 11:11 a.m. July 27, 2026
A tornado warning has been issued for parts of southeast Wisconsin until noon on Monday, July 27.
A tornado has been confirmed in Neenah.
Updated: 10:13 a.m. July 27, 2026
A line of fast developing storms has popped up in our western counties and is moving east. These storms have rapidly developed in 30 minutes bringing heavy rain, frequent lightning and some hail. As of 10:10 a.m. a severe thunderstorm warning has been issued for Jefferson and Waukesha Counties until 11 AM.
If you're curious, these storms are forming by something called gravity waves which are clouds that can push air upward allowing them to tap into all of the energy from the heat and humidity and form strong to severe storms. Weather models did not show this activity at all. But these storms look like they will hold on until they get to Lake Michigan.
The heat headlines outlined below remain on track.
------
Updated: 9:33 a.m. July 27, 2026
A lot has changed since the initial posting below. Let's start with the heat. With a lack of storms Monday morning, temperatures will likely be higher. Highs could reach the 90s for many locations and with miserable levels of humidity and dew points well into the upper 70s we could see heat index values surpass 100 degrees for most of southeast Wisconsin. The Heat Advisory previously issued for just western counties has now been expanded to include all of southeast Wisconsin. It ends at 9 PM Monday evening.
Some pockets of dense fog still remain from the early morning with visibility down to a mile in some areas. This fog is due to high levels of humidity leading to a lot of moisture in the atmosphere as well as light wind not moving the airmass around. The previously issued Dense Fog Advisory was allowed to expire on time at 8 AM.
Based on latest radar trends, the round of storms we were expecting from mid-morning to the early afternoon likely will not happen. We are no longer expecting a widespread area of severe storms. However, a few isolated stronger storms may be possible after 12 PM in our northern counties and a few more isolated strong thunderstorms are possible the rest of the afternoon and evening.
Currently we remain under a Level 3 Enhanced Risk for severe storms with damaging wind as the main threat, but I would not be surprised to see most of southeast Wisconsin dropped to a Level 2 Slight Risk given the latest trends with radar.
------
Posted: 4:43 a.m. July 27, 2026
The steamy humidity that rolled in for this past weekend and really got sticky on Sunday will stick around for Monday. Dew points are expected to stay in the upper 70s most of the day. The high dew points will add energy for some strong to severe storms later in the morning hours and again in the afternoon and evening. But, the sticky air is also causing some more immediate concerns with a Dense Fog Advisory issued until 8 AM Monday morning for our southern half of counties.
The timing for any storms Monday morning continues to trend later. The best window for some strong to severe storms Monday will be from 9 AM - 1 PM. Then we could see more isolated severe storms later in the afternoon and into the evening.
Any storms that do form Monday could be strong to severe. All of southeast Wisconsin is under a Level 3 Enhanced Risk for that potential. the more likely round of severe weather would be the first round in the late morning. Any storms that do form for a second round in the later afternoon and evening likely wouldn't be as widespread or as strong.
Damaging wind is by far the biggest threat for any storms Monday, mainly for the first round in the late morning, but also for any severe storms that form in the afternoon/evening. Isolated tornadoes or large hail can also not be ruled out.
Temperatures on Monday will continue to stay hot. Highs should reach the upper 80s and low 90s depending on where you with highest temps in some western counties and any areas that don't see morning storms. If the morning storms fail to materialize then highs would likely be hotter well into the 90s. Similarly, if storms and clouds linger into the afternoon we could be cooler.
As mentioned, dew points will stay sticky on Monday. They reach the miserable category on the muggy meter in many areas with dew points in the upper 70s. Those dew points will drop for Tuesday, but it's still going to stay humid with dew points in the mid 60s. More comfortable air is expected to return for Wednesday with dew points in the upper 50s.
The combination of highs around 90 and very high humidity will push feels like temps to some very warm levels. Some of the heat index numbers Monday afternoon could reach into the 100s, especially for some western counties. Lakeside areas, like Milwaukee, might stay in the 90s or near 100.
The high feels like temps expected for Monday afternoon has caused the National Weather Service to issue another Heat Advisory for a few western counties: Dodge, Jefferson and Walworth. The advisory starts at 10 AM Monday and goes until 9 PM.
Download the CBS 58 Weather app to track any severe storms for Monday and get alerts if watches or warnings are issued.
Stay ahead of the forecast with CBS 58 Weather for live radar, hourly and 7-day forecasts, current temperatures, wind speeds, weather watches and warnings, driving conditions and live camera views from across southeast Wisconsin.
The CBS 58 News and CBS 58 Weather Apps are here and totally free! Stay up to date with the most important News & Ready for whatever mother nature has in store for us with CBS 58 Weather. No matter where you are, or what time it is, the CBS 58 Apps are here for you.
Check out everything these Apps have to offer from News, Traffic, Sports, Weather, Interactive Radar, Daily/Hourly Forecasts, and more! All with the speed and ease of use you would expect from the CBS 58 News Team.