


Area Forecast Discussion
Issued by NWS Duluth, MN
Issued by NWS Duluth, MN
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057 FXUS63 KDLH 280850 AFDDLH Area Forecast Discussion National Weather Service Duluth MN 350 AM CDT Sat Jun 28 2025 .KEY MESSAGES... - Several opportunities for isolated to scattered strong to severe thunderstorms through Sunday evening. - Heavy rainfall tonight into Sunday morning in inland north central Wisconsin may fall over an area which previously saw very heavy rainfall from earlier this week. && .DISCUSSION... Issued at 330 AM CDT Sat Jun 28 2025 An area of general thunderstorms, with a few strong storms being observed to produce small hail and wind gusts to 40 mph, move through northwest Minnesota and enter north-central Minnesota early this morning. Mesoscale analysis from high-res model guidance and surface observations shows a less suitable environment to sustain these strong thunderstorms early this morning so the primary hazards are most likely to be numerous cloud-to-ground lightning strikes, heavy rainfall and winds gusting up to 40 mph in the Brainerd Lakes region through 7-8 AM this morning. Other parts of northern Minnesota could still see light to locally moderate rainfall. This early morning rainfall is expected to help mix out some of the locally dense fog which has formed in central St. Louis County. A delayed entry into northwest Wisconsin this morning is likely to keep those pockets of dense fog lingering a bit longer into the sunrise hours. A boundary sets up just south of the Northland today which will be the main focus for later-day severe weather chances of the region again this late afternoon and through the evening hours. Instability increases through the daytime as speed shear aloft increases. Disorganized directional shear is evident though on model forecast soundings though this afternoon as late afternoon convective initiation is expected. The elevated nature of any storms that do form though keep the primary threats as a large (scraping on very large hail into early evening) into early evening before more of a combined damaging wind and large hail threat emerges after 1600-1800 CT with storms finally having the potential to become surface based. Expect the primary area of concern to remain south of WI Hwy 77 in northwest Wisconsin and east of the Brainerd Lakes region with a mean easterly storm motion likely. Convective allowing high-res models keep hints at another storm complex forming in the later evening hours lasting into the overnight hours. A very moist airmass advected into northern Wisconsin has the potential to create another round of heavy rainfall (1-3 inches) over areas that just a few days ago saw 2-4 inches. This flooding threat will continue to be assessed today for potential need of any headline needs should confidence increase on that forecast rainfall axis overlapping the previous mid-week heavy rainfall observations. Another vorticity lobe maxima will move through the region Sunday daytime as a mean broad mid-level trough pushes eastward through the northern U.S. and southern Canadian Plains. Expect another round of thunderstorms Sunday, but specifically focused on northwest Wisconsin in the afternoon and evening hours. After a seasonable summer weekend, but with high dewpoints leading to notable humidities today and Sunday, a more westerly flow regime following the broad trough enters the region Monday to decrease dewpoints and leave seasonable temperatures. Expect continued scattered diurnal thunderstorm chances mid to late next week. The placement of surface high pressure to stacked mid-level central US ridge axis will be pronounced ahead of the holiday weekend forecast for late next week. Right now the pattern slightly favors a warm nose entering northern Minnesota, with cooler flow over northern Wisconsin. && .AVIATION /06Z TAFS THROUGH 06Z SUNDAY/... Issued at 1236 AM CDT Sat Jun 28 2025 Fog creates localized IFR and LIFR visibilities through 13Z today at area terminals ahead of improving visibilities this morning. An area of strong to localized severe thunderstorms in eastern North Dakota will be monitored over the next few hours to see about any amendments needed to northern Minnesota TAFs as this system trecks east-southeastward. Right now the mentions of prevailing showers with periodic thunderstorms seems fair for the given weakening eastward trends and bit more southeastward track expected so mainly affecting terminals south of US Hwy 2 in northern Minnesota. Another round of showers and thunderstorms is likely to initiate from 19-22Z today, but just how widespread the severe thunderstorm chances are is yet to be fully seen given this ongoing complex of storms early Saturday morning. Future TAF issuances will very likely see adjustments to timing of thunderstorms in current PROB30s and TEMPOS for 23Z today to 06Z Sunday. && .MARINE /FOR NEAR SHORE WATERS OF WESTERN LAKE SUPERIOR/... Issued at 250 AM CDT Sat Jun 28 2025 Light easterly winds around or under 10 knots occur today ahead of a wind shift to southwesterly tonight that lasts into early week. A few southwesterly gusts around 20 knots are most likely Monday afternoon, but only low to medium confidence at this time on any conditions meeting Small Craft Advisory criteria. 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...NLy AVIATION...NLy MARINE...NLy