Stormy, steamy Sunday with excessive heat, rainfall in Minnesota

Damaging winds and flooding rains possible.
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It's going to be oppressively hot on Sunday and along with the heat and humidity comes the risk for severe weather and flooding rains in parts of Minnesota. 

Western and central Minnesota to near the Twin Cities is currently under a slight risk for both severe storms and excessive rainfall, while the 7-county metro area has been placed in an excessive heat watch. 

Details on the excessive heat watch, which is in effect for Hennepin, Anoka, Ramsey, Washington, Carver, Scott and Dakota counties from Sunday afternoon through Monday evening. 

"Highs in the lower 90s and dew points in the low to mid 70s could make for heat indices around 100 Sunday and between 100 and 105 Monday. Low temperatures Sunday night should only fall into the mid 70s, providing little relief from the heat.

The high heat indices during the day will lead to increased risk for heat-related illness for those active outdoors or with limited access to air conditioning."

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Saturday will still be hot with highs soaring into the upper 80s, but the humidity and dewpoints will be lower than they were on Friday. It'll set the stage for the possibility of some nocturnal storms (nothing severe expected) into Sunday morning. 

Dewpoints surge back up into the 70s on Sunday and Monday, and that'll lead the way to 100-degree heat indices while also creating an environment for very heavy rainfall. 

Right now, the National Weather Service in the Twin Cities says a complex of storms that'll move through Montana on Saturday and then across North Dakota on Sunday morning, will eventually move through parts of Minnesota late Sunday, possibly tracking right along Interstate 94. 

That could lead to a damaging wind threat and excessive rainfall, which we'll have more details on in our Sunday morning Weather MN blog

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Some computer models have that line of possibly severe storms moving along the Canadian border, but the NWS suspects it'll be more in line with the GFS model, which has it moving down I-94. Here's the simulated future radar (GIF may not load in all browsers). 

gfs_ref_frzn_ncus_fh30-60

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