


Area Forecast Discussion
Issued by NWS Duluth, MN
Issued by NWS Duluth, MN
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612 FXUS63 KDLH 100848 AFDDLH Area Forecast Discussion National Weather Service Duluth MN 348 AM CDT Thu Jul 10 2025 .KEY MESSAGES... - Storms in northwest Minnesota likely to impact at least part of the international border and Iron Range this morning. Another chance for thunderstorms later this afternoon into overnight. - Chances for storms continue into Friday. Friday afternoon and evening are the best chances for strong to severe storms across the area as well as localized flooding. - Precipitation chances continue into the late weekend and early next week. Timing and placement of these chances are uncertain. && .DISCUSSION... Issued at 143 AM CDT Thu Jul 10 2025 A line of storms is moving to the east will affect the Borderlands and Iron Range this morning. These storms are weak due to the lack of wind shear in the environment. However, some areas under the line has seen over three quarters of an inch of rain, and that trend will continue under the highest reflectivities. More scattered convection further south accompanying the line will be up and down throughout the morning. It is uncertain how far east these storms will go, as the CAMs are having difficulty accurately representing the convection. Initiation timing for storms this afternoon and evening will depend on if/when the cap aloft erodes from diurnal heating. Instability is plentiful throughout this afternoon and evening, though wind shear is modest, at 15-25 kts across the CWA. Storm mode will when likely be stationary up- and-down cells, with main hazards being hail and damaging winds. However, model soundings are hinting at a limited threat for hail from high moisture and the height of the hail growth zone. PWATs 1.5-2" across the area will lead to slight chances for localized flooding, especially if storms train over the same area. A cold front will move through the Northland starting Friday morning and will move southeast throughout the day. Otherwise the environment will largely remain the same with plenty of instability and weak shear. However, as the cold front moves through, there is a narrow window where shear increases just behind the front, which may be the extra boost needed to create a few severe storms. Main hazards will again be hail. PWATs will remain high, the threat for localized flooding continuing. These storms are expected to last into Saturday, mainly across northwest Wisconsin. A weak ridge will settle in for Sunday, leading to warm conditions once again for Sunday and Monday. The GFS shows another chance for showers and storms as early as Monday due to an upper level trough in western Ontario, while the ECMWF keeps us dry still under the ridge until early Tuesday morning. Either way, showers and storms will return early next week. && .AVIATION /06Z TAFS THROUGH 06Z FRIDAY/... Issued at 1254 AM CDT Thu Jul 10 2025 A line of thunderstorms are approaching the Northland, though the longevity of these storms are in question, since the high resolution models are not following this line well. There is increasing probabilities that the northern portion of the line will reach INL and HIB, as this line seems to be sustaining itself for the time being. Chances for storms continue throughout the day, though probabilities for any one hour is low due to uncertainty, so tried to encapsulate most likely time frames within the PROB30 groups. && .MARINE /FOR NEAR SHORE WATERS OF WESTERN LAKE SUPERIOR/... Issued at 143 AM CDT Thu Jul 10 2025 Northeast winds continue across Lake Superior, and highest winds of up to 15 kts will be at the head of the lake. Waves today will once again be in 1-2 ft range. Showers and thunderstorms are possible today with stormy conditions starting early as mid morning but more likely in the afternoon. Storm chances continue through Saturday, with strong to isolated severe storms possible Friday afternoon and evening. Main hazards will be cloud to water lightning and hail. For the open water discussion, refer to the NWS Marquette Area Forecast Discussion at weather.gov/mqt. && .DLH WATCHES/WARNINGS/ADVISORIES... MN...None. WI...None. MARINE...None. && $$ DISCUSSION...KML AVIATION...KML MARINE...KML