Marine Weather and Tide Forecast for Suamico, WI

DISCUSSION
Issued at 221 AM CDT Fri Apr 10 2026

Light rain associated with strong mid-level FGEN was moving through the southeast half of the forecast area early this morning, and should be east of the region by around 12z/Fri.

High pressure brings dry weather and low relative humidity today.
The dry conditions persist into early Saturday afternoon, with a chance of showers arriving in NC/C WI later in the day.

A prolonged period of active weather arrives Saturday night into Sunday and continues through the middle of next week. Periodic showers and thunderstorms, and potential for heavy rainfall, can be expected through the period.

The first batch of heavy rainfall arrives Saturday night into Sunday, as a warm front lifts north into the region and a 45 to 55 knot southerly low-level jet brings a surge of Gulf moisture (PWATs 1-1.5 inches) and marginal instability. Not seeing much potential for severe storms during this first episode. Models support a lull in the precipitation later Sunday night into Monday, as H8 flow turns westerly (parallel to the baroclinic zone), PWATs drop to less than 1 inch and instability wanes.

The front sags south and stalls across the area Monday into Tuesday, and potentially lifts back to the north as a strong low pressure system approaches Tuesday night into Wednesday. This front will interact with a persistent flow of Gulf moisture and marginal to moderate instability. Instability peaks across the southwest half of the forecast area Monday afternoon and evening, as MUCAPE increases to 1-2k j/kg. This instability, combined with the frontal boundary and deep layer shear of 45-55 knots, supports potential for severe thunderstorms. Models are not very robust with convection Monday afternoon, but ramp up storms quickly during the evening. Additional strong to severe storms could develop as the front starts to lift back to the north Tuesday afternoon and evening. If the surface low tracks far enough west on Wednesday, we could see a surge of instability across eastern WI as the cold front moves through in the afternoon, so cannot rule out additional severe potential (especially damaging winds)
then. See the Hydrology section for possible flooding impacts.

Milder temperatures are expected through the period, with highs reaching into the 70s in parts of the area Sunday-Tuesday, and possibly even on Wednesday.

AVIATION
for 12Z TAF Issuance Issued at 615 AM CDT Fri Apr 10 2026

Stratocumulus clouds covered the region early this morning, with a mix of low-end VFR and MVFR ceilings being reported. Isolated IFR ceilings were seen in the far southeast part of the forecast area, where rain was steadier overnight.

MVFR ceilings will linger in some areas until late morning, then rising ceilings and partial clearing lead to VFR conditions for the rest of the day. NE-NW winds of 5 to 10 knots are anticipated.
Clear skies are expected tonight, along with light SE-S winds.
It is possible that patchy fog may develop overnight, but the dryness of the incoming air mass and a lack of measurable precipitation in our fog-prone areas argues against anything significant. Will leave any mention of fog out of the TAFs for now.

HYDROLOGY
Issued at 221 AM CDT Fri Apr 10 2026

Minor flooding continues on the Wolf River early this morning. A mainly dry period is anticipated through Saturday. Periods of heavy rain and thunderstorms arrive later in the weekend and continue through the middle of next week. During this upcoming period, probabilities for rainfall in excess of 1 inch are 85-95%, with a 35-60% chance of amounts in excess of 2 inches and a 5-20% chance of 3 inches or more. Current forecasts call for 1.75 to 2.25 inches of rain in most areas. Runoff from this rainfall, combined with rapid snowmelt in the Upper Peninsula and far northern WI, is expected to bring potential for more widespread and significant flooding by the middle of next week. Right now, it appears the most significant flooding impacts will occur on the Menominee River and its tributaries.

GRB WATCHES/WARNINGS/ADVISORIES
None.