textproduct: Green Bay

KEY MESSAGES

- Lingering icy spots are possible across area roads this morning, but snow will largely end for all but north-central WI

- Light snow possible late Friday night into Saturday morning. Accumulations will largely be focused towards north-central Wisconsin but a few flurries could get into central and east- central as well.

- Westerly gales may return to the marine areas Saturday evening.

DISCUSSION

Issued at 247 AM CST Fri Dec 19 2025

The last of the snow will be on its way through the region this morning. Additional accumulations remain light, around a few tenths, but slippery stretches remain, especially on untreated roads across portions of central and north-central Wisconsin. Winds will remain gusty for a few additional hours behind the departing snow, with gusts up to 25 to 30 mph likely to last until the early afternoon.

Attention then turns to the next clipper system in line, which will move through the region late tonight. Winds aloft will be on the increase again through the lower to mid levels as a push of warmer air arrives, but only a few gusts should mix down through around midnight. As the cold air swings through with the main portion of the clipper, fairly decent frontogenetic forcing should bring snow into north-central Wisconsin. This feature is mainly focused across the border along the Upper Peninsula, but cold air advection over the rest of the region will likely suffice for at least some flurries or light snow. Still, snow amounts around a couple inches will largely be focused towards Vilas County, with amounts tapering to around an inch by the time you get to a line from Rhinelander to Iron Mountain and lesser amounts further south. Probabilistic guidance suggest areas south of a line from Merrill to Marinette mainly see 20% chance or less of exceeding an inch of snowfall.

Next round of precipitation is then in the forecast for Monday night. Although again precipitation amounts will be light, this may yet be another period that bears watching for mixed precipitation or freezing drizzle as a warm layer will be in the area which may hamper ice production to a relatively colder surface. Where the warmer air lines up as we get closer will drive the precipitation type for this feature and the impacts.

Temperatures for the period will see a couple swings through the first few days of the forecast, with highs mainly in the teens today and Sunday, but in the upper 20s to lower 30s on Saturday. Then highs steady out for much of the middle of next week, with highs mainly lingering in the upper 20s to middle 30s.

AVIATION

for 06Z TAF Issuance Issued at 955 PM CST Thu Dec 18 2025

Late this evening, temperatures have fallen below freezing at most locations across the region with the exception of Door County. Beneath an upper trough, periods of light snow can be expected for the rest of the night, tapering off towards sunrise. In the snow, visibilities will drop to 1-2 SM at times. At KRHI, lake- effect snow will maintain IFR/MVFR conditions through early Friday.

Winds will be a major factor tonight, gusting 25-35 kts from the west- northwest. Minor drifting of the powdery snow is possible. Conditions will gradually improve late tonight through Friday morning as high pressure builds in, though breezy winds will persist. Flight conditions will become VFR in the afternoon to go along with diminishing winds.

Ceilings will lower once again on Friday night ahead of the next clipper. Low level wind shear will develop at RHI by the end of the taf period.

MARINE

Issued at 247 AM CST Fri Dec 19 2025

Strong winds behind the departing snow will keep gales in place through the morning before beginning to settle through the rest of the day Saturday. Winds are unlikely to mix to the surface Saturday night as warmer air builds up aloft, but additional gales will be possible Saturday evening as the next cold front rolls through.

GRB WATCHES/WARNINGS/ADVISORIES

Winter Weather Advisory until 6 AM CST early this morning for WIZ005-010>013-018>022-030-031-035>040-045-048>050-073-074.