Marine Weather and Tide Forecast for Cornucopia, WI
February 19, 2025 1:30 AM CST (07:30 UTC) Change Location
![]() | Sunrise 7:03 AM Sunset 5:41 PM Moonrise 12:23 AM Moonset 9:27 AM |
LSZ146 Expires:202410301030;;653085 Fzus73 Kdlh 300947 Mwsdlh
marine weather statement national weather service duluth mn 447 am cdt Wed oct 30 2024
lsz141>143-146-147-150-162-301030- 447 am cdt Wed oct 30 2024
.an area of Thunderstorms over western lake superior - .
the areas affected include - . Grand marais to taconite harbor mn - . Lake superior west of a line from saxon harbor wi to grand portage mn beyond 5nm - . Outer apostle islands beyond 5 nm from mainland - . Port wing to sand island wi - . Sand island to bayfield wi - . Silver bay harbor to two harbors mn - . Taconite harbor to silver bay harbor mn - .
at 445 am cdt, marine weather observations indicated an area of Thunderstorms, producing winds of 30 knots and frequent cloud to water lightning. This area of Thunderstorms was located along a line extending from near castle danger to 9 nm east of two harbors protected access agate bay to 8 nm southwest of port wing harbor, moving northeast at 55 knots.
locations impacted include - . Ironwood island, sand island, twin points safe harbor, devils island, tofte, cat island, beaver bay, manitou island, north twin island, herbster, meyers beach, york island, split rock lighthouse, eagle island, apostle islands national lake shore, port wing harbor, rocky island, raspberry island, castle danger, and sugar loaf cove.
precautionary/preparedness actions - .
mariners can expect gusty winds up to 30 knots, locally higher waves, and lightning strikes. Boaters should seek safe harbor immediately until these storms pass.
&&
lat - .lon 4710 9158 4716 9147 4744 9112 4756 9092 4768 9065 4737 9047 4697 9056 4690 9081 4694 9086 4692 9095 4683 9111 4682 9118 4683 9122 4678 9138
marine weather statement national weather service duluth mn 447 am cdt Wed oct 30 2024
lsz141>143-146-147-150-162-301030- 447 am cdt Wed oct 30 2024
the areas affected include - . Grand marais to taconite harbor mn - . Lake superior west of a line from saxon harbor wi to grand portage mn beyond 5nm - . Outer apostle islands beyond 5 nm from mainland - . Port wing to sand island wi - . Sand island to bayfield wi - . Silver bay harbor to two harbors mn - . Taconite harbor to silver bay harbor mn - .
at 445 am cdt, marine weather observations indicated an area of Thunderstorms, producing winds of 30 knots and frequent cloud to water lightning. This area of Thunderstorms was located along a line extending from near castle danger to 9 nm east of two harbors protected access agate bay to 8 nm southwest of port wing harbor, moving northeast at 55 knots.
locations impacted include - . Ironwood island, sand island, twin points safe harbor, devils island, tofte, cat island, beaver bay, manitou island, north twin island, herbster, meyers beach, york island, split rock lighthouse, eagle island, apostle islands national lake shore, port wing harbor, rocky island, raspberry island, castle danger, and sugar loaf cove.
precautionary/preparedness actions - .
mariners can expect gusty winds up to 30 knots, locally higher waves, and lightning strikes. Boaters should seek safe harbor immediately until these storms pass.
&&
lat - .lon 4710 9158 4716 9147 4744 9112 4756 9092 4768 9065 4737 9047 4697 9056 4690 9081 4694 9086 4692 9095 4683 9111 4682 9118 4683 9122 4678 9138
LSZ100
No data
No data

NEW! Add second zone forecast
FXUS63 KDLH 190546 AFDDLH
Area Forecast Discussion National Weather Service Duluth MN 1146 PM CST Tue Feb 18 2025
KEY MESSAGES
- Dangerously cold wind chills are expected tonight into Wednesday morning. Extreme Cold Warnings and Cold Weather Advisories go into effect at midnight.
- Light snow will move into the Arrowhead tonight and northwest Wisconsin early Wednesday morning. Snow amounts will range from a dusting to around 2 or 3 inches in the Arrowhead and a dusting up to 4 or 5 inches in northwest Wisconsin.
- Significantly warmer temperatures are expected late this weekend into early next week with above-freezing temps very likely (80+% chance).
DISCUSSION
Issued at 324 PM CST Tue Feb 18 2025
An interesting and unusual upper-level pattern was found over the region this afternoon. A retrograde 300 mb low was drifting westward over northeast North Dakota. Easterly winds were found over southern Manitoba and northern Ontario as far south as Upper Michigan on the 18Z RAP analysis at 300 mb with westerlies over southern North Dakota into central Minnesota and northern Wisconsin. A channel of cyclonic vorticity was found at 500 mb in the zone between these airstreams. An east-west oriented 700 mb trough stretched from New England west into Montana and northern Wyoming. Arctic high pressure remained in place at the surface over the region.
The 700 mb trough axis will sag southward this evening as the trough slowly deamplifies. Northerly winds north of the trough will usher in warm air advection and isentropic ascent tonight.
In addition to the isentropic lift, an area of omega will sag southward into the Arrowhead. Upstream surface obs and radar imagery across northern Ontario reveal light snow was falling as of 230 PM CDT. Look for that area of light snow to spread slowly southwestward with time tonight. The northerly low-level flow and cold air aloft will encouraged organized lake-effect snow to develop for the South Shore. The cloud cover and warm air advection should keep temperatures several degrees warmer than the past few nights. Winds should be a little higher than the previous few nights, too, generally between 3 and 10 mph.
The insulation of the clouds and mixing from the light winds will also help keep the temps a bit warmer. Wind chills overnight have risen several degrees with this forecast. Even so, we will keep the existing Cold Weather Advisories and Extreme Cold Warnings in place.
Light snow will gradually spread farther southwest into the Twin Ports and more of northwest Wisconsin Wednesday morning.
Forcing for ascent will diminish during the day and snow should slowly taper off, except along the South Shore where LES will persist into early Thursday morning. Total snow accumulation in the Arrowhead of a dusting up to 2 inches with a few spots possibly seeing 3 inches is forecast. Over the South Shore, portions of northern Iron County may see 3 to 5 inches, with a dusting up to 3 inches elsewhere in NW WI.
A steady warming trend will being on Wednesday and continue through the weekend. The upper-level trough will continue to sag southward with warm air advection aloft. Highs will climb into the single digits and low teens above zero on Wednesday. There is a small chance we may need additional cold weather headlines Wednesday night over portions of central Minnesota into the St.
Croix valley in Wisconsin.
A progressive upper-level pattern will return for the latter half of the week into early next week. Several weak waves will propagate across the region with alternating warming and cooling periods. Unfortunately it appears the warmest air during each cycle will pass over the Northland overnight and during the morning. High temps should climb above freezing on Sunday and perhaps a few 40s on Monday. There a few clipper-ish systems Saturday into early next week which could bring light snow.
AVIATION /06Z TAFS THROUGH 06Z THURSDAY/
Issued at 1146 PM CST Tue Feb 18 2025
VFR conditions currently in place late this evening will be decreasing to MVFR and IFR as a weak low pressure system bringing light snow moves in. Most of this widespread light snow will be occurring in the Arrowhead into northwest WI, likely reducing visibility to IFR and cigs to MVFR. Confidence in visibility reductions in INL and BRD is lower due to these terminals being on the edge of the snow. Therefore, PROB30 lines were added to account for this. Expect the snow in DLH, HIB, and HYR to end Wednesday evening as low pressure moves out of the area. Winds will mainly be from the northwest through the period.
MARINE /FOR NEAR SHORE WATERS OF WESTERN LAKE SUPERIOR/
Issued at 324 PM CST Tue Feb 18 2025
Downslope winds are forecast over the waters of the North Shore again tonight. Gusts of 25 to 30 knots are expected and may reach 35 knots for brief periods. Small Craft Advisories are in effect.
Warmer air aloft begins to move over the region Wednesday through the end of the week. Wind speeds and gusts will not be as strong in general with shallower mixing expected.
A clipper is forecast to move across northern Ontario Friday and Saturday. The tightening pressure gradient and stronger winds aloft should create conditions hazardous for smaller craft starting Friday. There is a small chance of a few gales along the cold front Friday afternoon and evening.
For the open water discussion, refer to the NWS Marquette Area Forecast Discussion at weather.gov/mqt.
DLH WATCHES/WARNINGS/ADVISORIES
MN...Cold Weather Advisory until 9 AM CST Wednesday for MNZ010-011- 018-019-026-035-037.
Extreme Cold Warning until 9 AM CST Wednesday for MNZ025-033- 034-036-038.
WI...Cold Weather Advisory until 9 AM CST Wednesday for WIZ002>004- 008-009.
Extreme Cold Warning until 9 AM CST Wednesday for WIZ001-006- 007.
MARINE...Small Craft Advisory until 10 AM CST Wednesday for LSZ140>142.
Area Forecast Discussion National Weather Service Duluth MN 1146 PM CST Tue Feb 18 2025
KEY MESSAGES
- Dangerously cold wind chills are expected tonight into Wednesday morning. Extreme Cold Warnings and Cold Weather Advisories go into effect at midnight.
- Light snow will move into the Arrowhead tonight and northwest Wisconsin early Wednesday morning. Snow amounts will range from a dusting to around 2 or 3 inches in the Arrowhead and a dusting up to 4 or 5 inches in northwest Wisconsin.
- Significantly warmer temperatures are expected late this weekend into early next week with above-freezing temps very likely (80+% chance).
DISCUSSION
Issued at 324 PM CST Tue Feb 18 2025
An interesting and unusual upper-level pattern was found over the region this afternoon. A retrograde 300 mb low was drifting westward over northeast North Dakota. Easterly winds were found over southern Manitoba and northern Ontario as far south as Upper Michigan on the 18Z RAP analysis at 300 mb with westerlies over southern North Dakota into central Minnesota and northern Wisconsin. A channel of cyclonic vorticity was found at 500 mb in the zone between these airstreams. An east-west oriented 700 mb trough stretched from New England west into Montana and northern Wyoming. Arctic high pressure remained in place at the surface over the region.
The 700 mb trough axis will sag southward this evening as the trough slowly deamplifies. Northerly winds north of the trough will usher in warm air advection and isentropic ascent tonight.
In addition to the isentropic lift, an area of omega will sag southward into the Arrowhead. Upstream surface obs and radar imagery across northern Ontario reveal light snow was falling as of 230 PM CDT. Look for that area of light snow to spread slowly southwestward with time tonight. The northerly low-level flow and cold air aloft will encouraged organized lake-effect snow to develop for the South Shore. The cloud cover and warm air advection should keep temperatures several degrees warmer than the past few nights. Winds should be a little higher than the previous few nights, too, generally between 3 and 10 mph.
The insulation of the clouds and mixing from the light winds will also help keep the temps a bit warmer. Wind chills overnight have risen several degrees with this forecast. Even so, we will keep the existing Cold Weather Advisories and Extreme Cold Warnings in place.
Light snow will gradually spread farther southwest into the Twin Ports and more of northwest Wisconsin Wednesday morning.
Forcing for ascent will diminish during the day and snow should slowly taper off, except along the South Shore where LES will persist into early Thursday morning. Total snow accumulation in the Arrowhead of a dusting up to 2 inches with a few spots possibly seeing 3 inches is forecast. Over the South Shore, portions of northern Iron County may see 3 to 5 inches, with a dusting up to 3 inches elsewhere in NW WI.
A steady warming trend will being on Wednesday and continue through the weekend. The upper-level trough will continue to sag southward with warm air advection aloft. Highs will climb into the single digits and low teens above zero on Wednesday. There is a small chance we may need additional cold weather headlines Wednesday night over portions of central Minnesota into the St.
Croix valley in Wisconsin.
A progressive upper-level pattern will return for the latter half of the week into early next week. Several weak waves will propagate across the region with alternating warming and cooling periods. Unfortunately it appears the warmest air during each cycle will pass over the Northland overnight and during the morning. High temps should climb above freezing on Sunday and perhaps a few 40s on Monday. There a few clipper-ish systems Saturday into early next week which could bring light snow.
AVIATION /06Z TAFS THROUGH 06Z THURSDAY/
Issued at 1146 PM CST Tue Feb 18 2025
VFR conditions currently in place late this evening will be decreasing to MVFR and IFR as a weak low pressure system bringing light snow moves in. Most of this widespread light snow will be occurring in the Arrowhead into northwest WI, likely reducing visibility to IFR and cigs to MVFR. Confidence in visibility reductions in INL and BRD is lower due to these terminals being on the edge of the snow. Therefore, PROB30 lines were added to account for this. Expect the snow in DLH, HIB, and HYR to end Wednesday evening as low pressure moves out of the area. Winds will mainly be from the northwest through the period.
MARINE /FOR NEAR SHORE WATERS OF WESTERN LAKE SUPERIOR/
Issued at 324 PM CST Tue Feb 18 2025
Downslope winds are forecast over the waters of the North Shore again tonight. Gusts of 25 to 30 knots are expected and may reach 35 knots for brief periods. Small Craft Advisories are in effect.
Warmer air aloft begins to move over the region Wednesday through the end of the week. Wind speeds and gusts will not be as strong in general with shallower mixing expected.
A clipper is forecast to move across northern Ontario Friday and Saturday. The tightening pressure gradient and stronger winds aloft should create conditions hazardous for smaller craft starting Friday. There is a small chance of a few gales along the cold front Friday afternoon and evening.
For the open water discussion, refer to the NWS Marquette Area Forecast Discussion at weather.gov/mqt.
DLH WATCHES/WARNINGS/ADVISORIES
MN...Cold Weather Advisory until 9 AM CST Wednesday for MNZ010-011- 018-019-026-035-037.
Extreme Cold Warning until 9 AM CST Wednesday for MNZ025-033- 034-036-038.
WI...Cold Weather Advisory until 9 AM CST Wednesday for WIZ002>004- 008-009.
Extreme Cold Warning until 9 AM CST Wednesday for WIZ001-006- 007.
MARINE...Small Craft Advisory until 10 AM CST Wednesday for LSZ140>142.
Stations | Dist | Age | Wind | Air | Water | Waves | inHg | DewPt |
PNGW3 - Port Wing, WI | 20 mi | 50 min | NW 13G | 7°F | 30.58 | |||
DISW3 - Devils Island, WI | 21 mi | 30 min | NNW 17G | 10°F | 30.61 | 4°F | ||
SLVM5 - Silver Bay, MN | 29 mi | 87 min | 0G | 4°F | 30.57 |
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