737 FXUS63 KMQT 271823 AFDMQTArea Forecast Discussion National Weather Service Marquette MI 223 PM EDT Sat Sep 27 2025
.KEY MESSAGES...
- A mostly dry and low impact weather pattern with near to above average temperatures holds into next week.
- Min RHs down to 30% or lower are possible Sunday and Monday afternoons in the interior west and central.
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.DISCUSSION... Issued at 1222 PM EDT Sat Sep 27 2025
As a `cold front` continues to bring a line of cloud cover from west to east across the U.P. this afternoon, expect winds to pick up a little from the west to northwest behind the frontal boundary. No rainfall is being seen with this frontal passage as the better forcing is much further north. That being said, we are still expecting temperatures to rise up into the upper 60s to even the mid 70s in the south central, even behind the `cold front` in the west. Given the dry air moving in behind the front, expect RHs to stay mainly at 40% or above in the interior areas, although a couple of spots could sneak into the mid to upper 30 percents late this afternoon.
Moving into tonight, thinking the U.P. will remain mostly cloud-free as high pressure ridging builds in. However, the NBM guidance does show some late night FG potentially sneaking into the interior west and central, so that is possible (especially considering that we had FG this morning, when it wasn`t even expected yesterday!). Overall, thinking lows will drop down into the lower 40s in the interior areas late tonight/early Sunday morning.
Expect any FG that does form to erode away by the late morning hours Sunday. Above normal temperatures look to continue next week, with highs generally being in the lower to mid 70s across the area. We could also see some RHs drop down to around 30% on Sunday and Monday, which could bring some near elevated fire weather concerns into the interior west and central; indeed some spots may get into the mid 20 percents on Sunday in the interior west. Thankfully, winds look to remain light Sunday and Monday as we remain under the influence of high pressure ridging. The high pressure ridging looks to continue until late in the week.
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.AVIATION /18Z TAFS THROUGH 18Z SUNDAY/... Issued at 100 PM EDT Sat Sep 27 2025
High pressure building in the rest of today through tonight behind the `cold` front will allow northwest to west winds to pick up this afternoon before calming down tonight. Thinking conditions across the terminals will remain VFR, although I think there is a 50% chance that some FG could sneak into SAW late tonight/early Sunday morning.
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.MARINE... Issued at 223 PM EDT Sat Sep 27 2025
West-southwest winds of around 25 knots are expected over the lake between the Keweenaw and Isle Royale the rest of this afternoon into this evening behind the `cold` front passing through this afternoon. While we could see westerly gusts above 20 knots for a few hours late tonight over the open eastern lake, with high pressure building back in expect winds to dwindle to 20 knots or less again late tonight/early Sunday morning. As a subtle, non-precipitating shortwave moves through on Sunday, expect west-southwest winds of 20 to 25 knots to return between the Keweenaw and Isle Royale. While light winds of 20 knots or less are expected Monday, with sfc troughing setting up over the Northern Plains from Tuesday onwards, expect east to southeasterly winds of 20 to 25 knots to develop over the lake Tuesday and Wednesday, eventually becoming southerly on Thursday.
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.MQT WATCHES/WARNINGS/ADVISORIES... Upper Michigan... None. Lake Superior... None. Lake Michigan... None.
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DISCUSSION...TAP AVIATION...TAP MARINE...TAP
NWS MQT Office Area Forecast Discussion