Marine Weather and Tide Forecast for Oostburg, WI

UPDATE
Issued 646 PM CDT Sat Oct 24 2026

Dry and quiet conditions continue tonight across southern Wisconsin. High pressure continues to dominate the pattern for the central and eastern CONUS. A cold front is slowly moving south down the state from its current position in the far northwestern corner of Wisconsin. This frontal boundary should stall out and remain across central and northern Wisconsin tonight. Therefore if your staring at radar like I am, it will be close enough to watch the light rain showers, but miss most of the area. Whatever showers do make it into the far northern areas of the CWA, they will have to compete with the low level dry air. Alls to say no major changes to the forecast.

Patterson

SHORT TERM
Issued 115 PM CDT Sat Oct 24 2026

This Afternoon through Sunday Night:

Synopsis/Mesoanalysis: A ridge of upper high pressure is pivoting across the western Great Lakes this afternoon, with attendant subsidence allowing for mostly sunny skies & quickly-climbing surface temperatures. Further to the west, 1 PM surface observations show a cold front extending along an approximate International Falls, MN - Sioux City, IA axis. Extending from an area of deepening low pressure over northern Manitoba, said cold front has maintained a quick eastward pace through the first half of today, with a similar speed of progression continuing through the remainder of this afternoon. This forward progress will take the front into northern Wisconsin by this evening. The boundary will slow considerably overnight as its parent low pressure occludes near the Hudson Bay & high pressure simultaneously strengthens over the Ohio Valley. Substantially slower progression speed will keep the front north of the region through most of the day Sunday, with the boundary finally moving into & through southern Wisconsin Sunday night. Post-frontal north-northeast winds will usher modestly cooler and drier air into southern Wisconsin by daybreak Monday. No rain is anticipated during the frontal passage.

Tonight: Mid-upper level clouds will thicken areawide thanks to increasing warm advection ahead of the approaching cold front. Worth noting that a handful of 12Z Saturday CAMs spit out some light QPF toward central Wisconsin within this cloud cover, though large dew point depressions in the lower half of the column cast serious doubt on any precip reaching the surface. Have thus kept the forecast dry through tonight, but will continue to monitor trends.

Sunday: Expecting another day of well above-normal temperatures with southern Wisconsin still firmly within the prefrontal warm sector & affiliated southwesterly surface flow. Have bumped high temps up a few degrees areawide given this favorable positioning.

Quigley

LONG TERM
Issued 115 PM CDT Sat Oct 24 2026

Monday through Saturday:

Synopsis: Cooler temperatures will prevail during the day Monday in the wake of the Sunday evening/night cold frontal passage. Southerly to eventually southwesterly surface flow will steadily return Tuesday into Wednesday, allowing for a steady warm up by the middle of the work week. Currently centered off the British Columbia coast, an upper trough will slowly progress from the Cascades into the northern Rockies Monday into Tuesday. The trough will eject into the Northern Plains Tuesday night, quickly progressing toward the southern Hudson Bay vicinity by Thursday morning. The trough will induce surface cyclogenesis over the Dakotas Tuesday night, with the developing surface low moving northeast toward the Hudson Bay by Thursday. The low will pull a cold front across southern Wisconsin some point Wednesday afternoon into Thursday morning, with forcing along the front providing chances for light rain. Mid-level height falls will slowly but steadily build into the Upper Mississippi Valley next weekend, supporting additional rain potential.

Monday night into Tuesday: Forecast continues to trend rain-free as an upper shortwave steadily trends along a more northwesterly track/away from southern Wisconsin. With modeled mid-level height falls & low level frontogenesis and temp advection signals continuing to shift away from the area, emerging QPF-free forecasts from the NBM thus appear reasonable & have been maintained in the afternoon update. Will continue to monitor trends in coming updates.

Wednesday afternoon into Thursday morning: In contrast to 24 hours ago, global deterministic and ensemble guidance is coming into much better agreement regarding large scale pattern evolution. Confidence in a weak cold frontal passage is thus increasing during this time frame, with modeled precipitable water & moisture transport supportive of at least some light rain potential. Limiting factor will be the magnitude of available frontal convergence, as the boundary may be entering a decaying phase as it arrives into southern Wisconsin. As such, NBM's current ~20-40% precip probabilities appear representative to the setup, and will be iterated off of as this portion of the period draws closer. Initial probabilistic QPF points toward totals remaining at or below a tenth of an inch.

Quigley

AVIATION
Issued 646 PM CDT Sat Oct 24 2026

VFR conditions are expected through the forecast. The slightly stronger south to southeast winds this evening should prevent any fog from developing tonight. Mid to upper level clouds will continue to move into southern Wisconsin from the west through Sunday giving the area a Broken to Scattered cloud deck. Sunday morning winds will shift to southwesterly. Sunday night winds diminish again leading to light and variable winds.

Patterson

MARINE
Issued 115 PM CDT Sat Oct 24 2026

Low pressure near 990 mb will progress toward the Hudson Bay this evening. Progression of the low will maintain generally southerly flow across the waters, with gusts between 25-30 knots possible over the northern half of the lake this afternoon and tonight. Can't rule out an isolated gust approaching gale force during this time frame, with conditions not widespread enough for headlines.

Winds will trend southwesterly while steadily weakening ahead of an approaching cold front on Sunday. Currently expecting the front to move south across Lake Michigan Sunday evening and night, bringing a breezy northeast wind shift. Gales are not anticipated during the frontal passage, with any isolated rain showers expected to remain over the far northern part of the lake. Breezy northeast winds will continue through Monday as 1038 mb high pressure slides into Ontario from the Canadian Great Plains. Winds will trend easterly and eventually south to southwesterly Tuesday into Thursday as the aforementioned high shifts into the northeastern United States.
Widespread rain chances return Wednesday into Friday.

A brief period of Small Craft Advisory conditions is expected this afternoon & evening in far northern nearshore zones. A Small Craft Advisory remains in effect between 12-10 PM CDT from Port Washington north to Sheboygan. Additional, more widespread Small Craft Advisory conditions are anticipated behind a cold front Monday into Tuesday, with headlines becoming necessary in later forecasts. Will be monitoring for further Small Craft Advisory conditions later next week with Lake Michigan positioned between areas of high & low pressure/within an elevated gradient wind field.

Quigley

MKX WATCHES/WARNINGS/ADVISORIES
WI...None.
LM
Small Craft Advisory
LMZ643 until 10 PM Saturday.