Marine Weather and Tide Forecast for Bayfield, WI

DISCUSSION
Issued at 249 PM CDT Sun Apr 20 2025

Widespread high clouds are spreading northward across the area this afternoon, in advance of an approaching trough and surface low that will track from near Kansas City across the UP of Michigan by tomorrow afternoon. An area of light to moderate rainfall is moving northward through Wisconsin, with light rain expected over southern reaches of the forecast area between 4-5pm. Rainfall will continue northward this evening, over the Arrowhead and portions of northeast MN. Forcing and moisture will remain closer to the trough and surface low, limiting rainfall chances across western portions of northeast MN, from the Brainerd Lakes area northward to the International border.
Cooling low level profiles will allow for a transition to rain/snow or all snow across portions of the Arrowhead, North Shore, and northwest Wisconsin beginning late tonight. Snow is expected to be wet and heavy, and the transition will depend on how quickly profiles cool. Given the track of the surface low, do not expect much terrain enhancement along the North Shore.
However, as moisture is pulling away from the area tomorrow afternoon, northwesterly winds across western Lake Superior could provide some enhancement across the Snow Belt in northwest Wisconsin.

Despite the potential snowfall, temperatures will warm into the low to mid 40s across the eastern Arrowhead, and Iron and Price County tomorrow. Temperatures warm to the lower 60s near Brainerd Lakes northward to International Falls.

Broad troughing takes shape over the northern Rockies and Plains through the rest of the week. Several impulses will parade across the region, providing a few more opportunities for generally light rain. No significant changes were needed to this portion of the forecast, with the exception of Thursday afternoon. Ahead of one of the shortwaves, temperatures cool aloft to allow for steeper lapse rates and elevated instability.
Added in a low chance of thunderstorms across portions of northwest Wisconsin Thursday afternoon and evening.

AVIATION /00Z TAFS THROUGH 00Z TUESDAY/
Issued at 654 PM CDT Sun Apr 20 2025

Low pressure passing to the south will spread rain and some rain/snow mix into the region tonight into tomorrow morning. The rain will bring low ceilings as well to DLH and HYR where IFR ceilings are expected. A period of MVFR ceilings will be possible at HIB if the rain can make it that far north. Have kept in with this update, but trends are that the rain remains just to the south. MVFR to IFR visibilities are expected during the rain as well. The system departs tomorrow morning with conditions improving through the day. VFR conditions may return to DLH and HYR earlier than expected if the system moves out a bit quicker than currently expected. Gusty winds to 15 to 25 knots will be possible through much of the period at DLH and HYR as they will be closer to the low.

MARINE /FOR NEAR SHORE WATERS OF WESTERN LAKE SUPERIOR/
Issued at 249 PM CDT Sun Apr 20 2025

East to northeast winds strengthen this evening, especially in the Twin Ports area, ahead of an approaching low pressure system. Winds increase further overnight into Monday morning, to 15 to 25 knots with gusts of 25 to 30 knots for much of the nearshore waters. Small Craft Advisories remain in effect for the Twin Ports area beginning this afternoon with portions of the North Shore to Taconite Harbor and all of the South Shore starting at 4AM CDT Monday. The wind will back Monday to northerly then decrease through the day.

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 from 4 AM to 4 PM CDT Monday for LSZ121- 146>148-150.
Small Craft Advisory from 4 AM to 1 PM CDT Monday for LSZ142- 143.
Small Craft Advisory until 10 AM CDT Monday for LSZ144-145.