Showers and isolated t-storms late tonight through Sunday morning; dry and cooler with breezy NW winds Sunday afternoon; warmer Monday highs ~80F

Rain moves into northeast Minnesota and northwest Wisconsin late tonight and continues into Sunday morning. Dry weather returns by Sunday afternoon. Note: Greatest chance for rain in Duluth and Superior occurs roughly between 3 AM-10 AM Sunday.

It’s going to take several more hours before the rain reaches Duluth, the North Shore and northwest Wisconsin as the area of rain and thunderstorms currently over western and northern Minnesota makes its way to the east overnight, additional development is possible out ahead of the line later this evening.

18z NAM-WRF model radar forecast valid from 9 PM Saturday to 3 PM Sunday. Source:

Showers along with a few thunderstorms will continue this evening in north-central Minnesota.

Overnight will see rain develop farther east, including in northeast and eastern Minnesota and northwest Wisconsin. The rain will end from west to east before Noon Sunday, although some rain could linger into early Sunday afternoon in far northeast Minnesota (Grand Marais, Hovland and Grand Portage areas)

Rainfall totals have increased a bit compared to 24 hours ago per model guidance. Looks like much of the Northland could get between a quarter and three quarters inch of rain through Sunday morning with locally higher amounts possible. Source:


Goes-16 infrared satellite loop from Saturday afternoon-early evening, August 17, 2019. Source:

Quite an eruption of thunderstorms this afternoon stretching from northwest Minnesota to South Dakota, some of these storms have been severe, especially in South Dakota.

Goes-16 water vapor satellite loop from Saturday, August 17, 2019. An impressive looking system over northern portions of Saskatchewan and Manitoba today, the southern portion of this system will be sweeping through the Northland through Sunday morning which will bring some rain to the area.

Low temperature forecast for Sunday morning, August 18. Source:

High temperature forecast for Sunday, August 18.

…Weather Summary…

Hopefully you were able to get outside and enjoy this beautiful late summer weather that we had today, these kinds of days won’t last much longer. Note: Duluth racked up another 80 degree day today, this makes 40 days so far this summer (since June 1) with a high temperature of at least 80 degrees. Average number of 80 degree days from June 1 to August 31 is 23 days.

There’s already been some showers and thunderstorms this afternoon in far northern Minnesota, and more rain is on the way as a cold front moves east out of western Minnesota which will help increase the lift in the atmosphere to produce some rain. A few thunderstorms are possible as well tonight with a marginally unstable atmosphere over the area with CAPE of around 500 J/kg or less. Precipitable water increasing to around 1.20-1.70″ could lead to some downpours in parts of the area late tonight into Sunday morning. Lows tonight will range from the mid 50s to mid 60s.

Rain moves out of Northland from west to east before Noon Sunday. Mostly cloudy skies will give way to some sunshine Sunday afternoon with cooler temps with highs in the mid 60s to mid 70s. Winds will shift to the northwest and will be on the breezy side with gusts to 25 mph.

Monday looks like a real nice day once again with highs in the upper 70s to lower 80s with southwest winds. A few showers or thunderstorms are possible Monday night and Tuesday as a cold front moves through the area, but at the moment this doesn’t look like a real good setup for a lot of rain.

Forecast for Duluth and Superior

.Tonight… Becoming mostly cloudy. Occasional showers developing mainly after 3 AM. Isolated thunderstorms also possible. Low 60 to 65. Wind south 10 to 15 mph becoming east.

.Sunday… Showers possible mainly before 10 AM. Mostly cloudy with decreasing cloudiness by the afternoon. Cooler. Breezy. High 71 to 76. Wind becoming northwest 10 to 20 mph with gusts to 25 mph.

.Monday… Partly cloudy. High 77 to 82. Wind southwest 10 to 20 mph.

Normal temperatures for August 18

  • High 74
  • Low 55
  • August 18 Sunrise 6:10 AM CDT
  • August 18 Sunset 8:14 PM CDT

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