


Area Forecast Discussion
Issued by NWS Duluth, MN
Issued by NWS Duluth, MN
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476 FXUS63 KDLH 270007 AFDDLH Area Forecast Discussion National Weather Service Duluth MN 707 PM CDT Thu Jun 26 2025 .KEY MESSAGES... - An area of rain and a few thunderstorms will lift northeastward across the Northland this afternoon and tonight. Additional rainfall amounts of 1 to 2 inches are forecast over northwest Wisconsin with lower totals farther west. - There is a 10 to 20 percent chance of flash flooding over portions of Sawyer, Price, and Iron counties tonight. - Strong to severe thunderstorms are possible late Friday night through Sunday evening. - Warm and humid weather is expected this weekend. && .DISCUSSION... Issued at 345 PM CDT Thu Jun 26 2025 Tonight: A shortwave trough axis stretched from southwest Manitoba to eastern Nebraska this afternoon. A nearly stationary boundary has begun to move northward in response to strengthening southerly winds over eastern Iowa and deepening low pressure over northwest Iowa. An area of rain and embedded thunderstorms was found over the northern two-thirds of Minnesota and west- central Wisconsin. Expect the rain to spread northeastward with time tonight. Elevated instability will spread northward into northwest Wisconsin this evening and a few thunderstorms are likely over that area tonight. Severe weather is not anticipated. Much of northwest Wisconsin received rainfall yesterday and soils have less capacity to absorb more rain today. The potential for thunderstorms causing locally enhanced rain rates may lead to localized flash flooding. There is a 10 to 20 percent chance of flash flooding over portions of Sawyer, Price, and Iron counties. Rain amounts tonight of up to one-half inch are forecast over portions of the Arrowhead into central Minnesota while another 1 to 2 inches is forecast over northwest Wisconsin. Friday: High pressure develops for Friday with increasing sunshine expected. Temperatures will climb into the upper 60s to upper 70s. Temps will be coolest Ashland, Iron, and Price counties where rain-laden soils and loitering cloud cover will limit heating response. Strong northeast winds over western Lake Superior will continue the risk of rip currents for the beaches of Duluth and Superior. Friday night and Saturday morning: Southerly flow will bring plenty of warm and moist air into the Northland for the weekend. An initial shortwave trough and a strengthening low-level jet across the Dakotas Friday evening/night may prompt an MCS to develop in North Dakota or the southern portions of Saskatchewan and Manitoba. If the MCS does develop, the low-level jet may sustain the complex as it propagates eastward overnight. Storms may move into the Northland from the west during the early morning hours of Saturday, between 3 and 7 AM. There remains a "Marginal" (1 out of 5) risk of severe storms early Saturday morning. The main threat will be damaging wind gusts, although a few hailstones of dime to penny size are also possible. The storms will continue to propagate eastward across the Northland late Saturday morning through early afternoon. Previous discussion for Saturday afternoon through early next week below... As we go into Saturday afternoon, instability will be on the increase (MUCAPE rising to ~2-3 kJ/kg into late Saturday afternoon/night) with ~30-40 kt of 0-6 km shear. The question will be how soon a cap can bust for storms to develop given the potential for morning convection, which may keep things stable perhaps well into the afternoon. The best synoptic forcing may be displaced over the Dakotas/Minnesota border with a weak occluded front may be. But with all that said, if the cap can be busted, soundings initially look favorable for all hazards; large hail and damaging winds being the main threats, but with a tornado or two not out of the question. As is often the case, this could start with some discrete convection, then become a bit more organized into Saturday evening/night, but there`s still a lot of unknowns about how everything will come together. On Sunday, a cold front passing through will probably trigger another round of thunderstorms, possibly strong to severe, with northwest Wisconsin being the most likely place to be affected. With the front passing through, this looks like it would be mostly a hail/wind situation than anything else, but it`s really too soon to be very precise about the nitty-gritty details. With the storm talk out of the way, the southerly flow is still expected to bring hot and humid temperatures to the Northland both Saturday and Sunday. At this point, it`s looking slightly less favorable that widespread Heat Advisories will be needed, with some of that uncertainty owing to aforementioned storm potential, which could cool things off a bit. Still, heat indices approaching or hitting 90 degrees with highs in the 80s and dew points in the 60s to low 70s will lead to some unpleasant conditions for those sensitive to or generally disliking hot weather. Early next week: We had previously been advertising mainly quiet weather, but at least on Monday, there is potential for a trough to pass through with west to northwest flow. This could lead to some wraparound-style showers and perhaps storms (most likely non- severe). Tuesday may be quieter, but then perhaps a cold front going into Wednesday to keep things interesting. In general, temperatures are looking to be around to a bit above average early to mid-week. && .AVIATION /00Z TAFS THROUGH 00Z SATURDAY/... Issued at 707 PM CDT Thu Jun 26 2025 Showers and MVFR ceiling will continue this evening before showers taper off during the early morning hours. Ceilings will then lower to IFR or lower for most areas with areas of fog developing. This will result in at least MVFR visibilities for all terminals except for INL. DLH and HYR may see visibilities to IFR or lower. Ceilings and visibilities will improve to MVFR or better by mid to late morning with some VFR conditions by late in the period. INL is expected to remain north of this activity and VFR throughout. && .MARINE /FOR NEAR SHORE WATERS OF WESTERN LAKE SUPERIOR/... Issued at 345 PM CDT Thu Jun 26 2025 Strong and persistent northeast winds will continue today and Friday and will gradually weaken Friday afternoon. Dangerous wind and waves is forecast overnight through Friday morning and Small Craft Advisories were extended. A few thunderstorms are possible tonight from Port Wing to Saxon Harbor. Cloud-to-water lightning is the main threat. There is another chance of thunderstorms Saturday morning and Saturday evening into the overnight. A few storms may be strong to severe. For the open water discussion, refer to the NWS Marquette Area Forecast Discussion at weather.gov/mqt. && .DLH WATCHES/WARNINGS/ADVISORIES... MN...Beach Hazards Statement until 10 PM CDT this evening for MNZ037. WI...Beach Hazards Statement until 10 PM CDT this evening for WIZ001. MARINE...Small Craft Advisory until 10 AM CDT Friday for LSZ142>148. Small Craft Advisory until noon CDT Friday for LSZ150. && $$ DISCUSSION...Huyck/JDS AVIATION...BJH MARINE...Huyck