Marine Weather and Tide Forecast for Cornucopia, WI

DISCUSSION
Issued at 504 AM CST Wed Jan 15 2025

High pressure was centered over the Mid-Mississippi Valley this morning with mainly clear skies across the Northland. A warm front was analyzed across the Dakotas and into the Central Plains. As the high moves further southeast today, winds will turn southerly and gusty while bring warmer air into the region. Clouds will be on the increase through the day as the warm front to our west moves in. This front will bring chances for light snow showers by mid-morning in the northwest and spread across the remainder of the area by early afternoon.
These snow showers will then end from west to east overnight with dry conditions in place by daybreak Thursday. Snowfall accumulations will be around an inch or less for most with higher amounts to around 2 inches possible in the Minnesota Arrowhead and parts of northwest Wisconsin. Additionally, there may be times with the loss of ice aloft that may lead to some freezing drizzle. NBM probabilities for this have come down, but the threat is non-zero.

Northwesterly flow will be in place for Thursday, but will not bring any cooler air into the region. What it will do is lead to lake effect snow showers across northern Iron County through early afternoon before winds turn more westerly and shift any lake effect into Upper Michigan. Snowfall totals in northern Iron County of 1 to 3 inches will be possible when including the snowfall expected today and tonight. Highs Thursday will be in the middle 20s to lower 30s.

An area of low pressure will move east north of the International Border Friday and Friday night and drag a cold front across the Northland. Some light snow showers will be possible with this front, but models are less than enthusiastic in this regard with WPC SREF plumes barely budging. The bigger impact from this system will be the surge of colder air that arrives behind the cold front. Temperatures will fall Friday night and continue a downward trend through the day Saturday as well, bottoming out in the teens and lower 20s Saturday night.
Highs Sunday and Monday will remain below zero with overnight lows in the teens and 20s below zero each night. Winds do not look to completely diminish overnight with wind chills falling into the 20s and 30s below zero with some readings of -40 or lower in northeastern Minnesota possible Sunday night. Cold Weather Advisories look likely during this stretch with the possibility of our first Extreme Cold Warning if current trends hold. With northwesterly winds persisting into Monday, lake effect snow across northern Iron, Ashland and Bayfield counties will be possible. Otherwise, generally dry conditions will prevail across the remainder of the Northland.

AVIATION /12Z TAFS THROUGH 12Z THURSDAY/
Issued at 553 AM CST Wed Jan 15 2025

VFR conditions predominate across the region this morning with MVFR ceilings at INL. These MVFR ceilings will spread southeast through the morning and into the afternoon, reaching HYR by mid-afternoon. Snow showers will arrive with these ceilings as well and bring periods of MVFR visibilities. Further reductions to 1 mile will be possible during stronger snow showers and tempo groups may be needed to account for this. Snow showers end from west to east this afternoon into tonight and any accumulations up to 2 inches will be possible. There is a non- zero threat for some freezing drizzle at times, but this threat has lowered since the previous update. Breezy southwesterly winds today will become northwesterly this afternoon and evening with gusts to 20 to 25 knots possible. LLWS will affect much of the region for most of the period as well.

MARINE /FOR NEAR SHORE WATERS OF WESTERN LAKE SUPERIOR/
Issued at 504 AM CST Wed Jan 15 2025

Winds will be southwesterly today in the wake of high pressure.
Sustained winds of 10 to 20 knots are expected with gusts to 25 to 35 knots into this evening. Chances for gales have fallen to around 10% with this update, so have replaced the Gale Watch with Small Craft Advisories for all the nearshore waters for today into Thursday morning. Winds tonight will become westerly to northwesterly behind a frontal boundary with gusts to 25 to 30 knots before weakening Thursday morning. Snow showers will be possible today into this evening and may lead to visibilities down to a mile or less in stronger snow showers. Waves this afternoon of 3 to 9 feet will be possible, highest along the North Shore from Silver Bay to Grand Portage. A clipper will move through the region Friday into Saturday and bring another period of elevated winds, including some gales along the North Shore Friday night.

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...Small Craft Advisory until noon CST Thursday for LSZ140>148- 150.