Dangerous heat and severe weather Wednesday


A summer storm brings heat and humidity to Minnesota and creates widespread rains and storms, some of which are severe.

Wednesday forecast

A major storm affecting Minnesota is already beginning to change the direction of the wind to more southerly winds beginning Wednesday morning, and winds will increase during the day. This is channeled into the hot, even wetter air throughout the state.

Wednesday morning temperatures are already mostly in the 60s and 70s, and in the afternoon they will hit 80s for northern Minnesota and 90s for the south. High dew points in the 1970s will make the day very muggy and will push the heat index up to 100 degrees for parts of the state, including the Twin Cities. Because of this, much of southern Minnesota is under a heat warning, and the subway is under an excessive heat warning.

Heat index expected on Wednesday

National Metereological Service

Heat and humidity are also helping to fuel storms that moved to Minnesota overnight, some of which have been severe. This is where the rains and storms are at 6:48 am:

time graph

6:48 am radar Wednesday

National Metereological Service

Storm activity will decrease in the morning and be more intense in the afternoon. Then, fueled in part by warm weather, they are likely to re-develop in the late afternoon and evening.

time graph

Place of precipitation expected on Wednesday afternoon

National Metereological Service

Much of downtown through northeast Minnesota is at risk of severe weather on Wednesday.

time graph

Wednesday severe weather risk

National Metereological Service

In fact, there have already been some severe weather reports on Wednesday morning, including winds of 83 mph at the Fergus Falls airport.

With any additional severe weather on Wednesday, hail and damaging winds are the main threat, but isolated tornadoes are also possible. Periods of heavy rain are also likely with heavy storms.

It currently appears that the heaviest rain from the system could target northern and central Minnesota, with some overall totals of more than an inch of rain possible.

For the Twin Cities, storms are likely to arrive late Wednesday night and overnight, with persistent storms through Thursday.

That extended forecast for Thursday through the weekend will be updated around 9 a.m.

Programming Note

You can listen to my live weather updates on Minnesota Public Radio at 7:48 am Monday through Friday morning.