Windy conditions will ensue today as a low pressure system over the upper Mississippi Valley moves east. The high winds will be caused by a tight pressure gradient between the low pressure and an elongated high pressure over the Atlantic Coast.
The image below shows the pressure gradient in white and surface wind barbs in yellow (indicating winds will be from the southwest) valid at 4 PM CDT. The surface wind speed is represented by the color image, where the lighter blue color represents winds around 30 mph and light pink represents winds around 5 to 10 mph. A Wind Advisory has been issued for this afternoon for several of Wisconsin's southernmost counties, where winds are expected to be the strongest. Wind gusts could reach as high as 45 mph.
The southwesterly winds will usher in warm air. High temperatures in southern Wisconsin will be in the low to mid 90s, with the highest temperatures farther south. Dewpoints in the 60s will make it feel more like the mid to upper 90s though. While this is below Heat Advisory criteria, it is probably a good idea to review heat safety guidelines, available on our Preparedness Page. The image below shows the forecasted apparent temperature values at 4 PM this afternoon.
The low pressure will bring a warm front through the northeast part of the state this afternoon. Meanwhile, a weak cold front will enter the western part of the state. A chance of storms will accompany the fronts; however, the best chance will be towards central and northeast Wisconsin. The storms are expected to spread southward later this evening, but will remain mainly north of a line from Madison to Milwaukee. Some storms could be strong to severe. Stay tuned to our website and the Storm Prediction Center's website for updates. Additional information is also available on our Severe Weather Briefing Page.
A Severe Thunderstorm Watch has been issued for Sheboygan, Fond du Lac, Green Lake, and Marquette counties until 8 pm.