National Weather Service United States Department of Commerce

Severe Thunderstorms and Heavy Rain for the South-Central U.S.

Severe thunderstorms capable of very large hail, damaging wind, and a couple of tornadoes will be possible Monday afternoon into the night from portions of the central and southern High Plains into southwest Texas. A heavy rain event with flooding is expected in the southern Plains into western Arkansas through the end of the week. Read More >

 

FZUS63 KMQT 162105
GLFLS

Experimental Tabular Open Lake Forecast for Lake Superior
National Weather Service Negaunee MI
505 PM EDT Sun May 16 2021

Waves are the significant wave height - the average of the highest
1/3 of the wave spectrum. Occasional wave height is the average of
the highest 1/10 of the wave spectrum.

.SYNOPSIS...A 29.6 inch trough will continue moving from northern
Manitoba into northern Ontario this evening. A trailing 30.1 inch
ridge will remain stationary over Lake Superior tonight into
Monday morning. A 30.2 inch high pressure ridge builds over the
Upper Great Lakes Monday night and strengthens to 30.3 inches on
Tuesday and Wednesday. A 29.7 inch trough will move over Ontario
for Thursday as a 29.4 surface low over the Intermountain West
strengthens as it treks toward the Central CONUS by Friday.

LSZ162-170400-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
347 PM EDT Sun May 16 2021 /247 PM CDT Sun May 16 2021/

.LATE THIS AFTERNOON, Variable winds around 10 knots or less.
Waves calm to 2 feet.
.TONIGHT, Northeast winds 5 to 15 knots veering southwest after
midnight. Patchy dense fog after midnight. Waves calm to 2 feet.
.MONDAY, Southwest winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon. Waves calm to 2 feet.
.MONDAY NIGHT, Southeast winds 5 to 15 knots veering south after
midnight. Waves calm to 2 feet.
.TUESDAY, East winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY NIGHT, East winds 5 to 15 knots. A chance of showers.
Waves calm to 2 feet.
.WEDNESDAY, East winds 5 to 15 knots veering southeast. A chance
of showers. Waves calm to 2 feet.
.THURSDAY, South winds 10 to 20 knots. Showers likely. Waves
calm to 2 feet.

$$

LSZ263-170400-
Lake Superior from Saxon Harbor WI to Upper Entrance to Portage
Canal MI 5NM off shore to the US/Canadian border including Isle
Royale National Park-
347 PM EDT Sun May 16 2021

.LATE THIS AFTERNOON, Variable winds around 10 knots or less.
Waves calm to 2 feet.
.TONIGHT, Southeast winds 5 to 15 knots veering southwest after
midnight, then increasing to 10 to 20 knots late. Patchy dense
fog after midnight. Waves calm to 2 feet.
.MONDAY, Southwest winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon. Waves building to 1 to 3 feet, then
subsiding to calm to 2 feet.
.MONDAY NIGHT, Southeast winds 5 to 15 knots veering south after
midnight. Waves calm to 2 feet.
.TUESDAY, South winds 5 to 15 knots backing east by mid
afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT, Southeast winds 5 to 15 knots veering south
after midnight. A chance of showers. Waves calm to 2 feet.
.WEDNESDAY, South winds 5 to 15 knots increasing to 10 to
20 knots. A chance of showers. Waves calm to 2 feet.
.THURSDAY, South winds 10 to 20 knots. A chance of showers.
Waves calm to 2 feet.

$$

LSZ264-170400-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
347 PM EDT Sun May 16 2021

.LATE THIS AFTERNOON, Variable winds around 10 knots or less.
Waves calm to 2 feet.
.TONIGHT, South winds 5 to 15 knots veering southwest late.
Patchy dense fog after midnight. A slight chance of rain showers
after midnight. Waves building to 1 to 3 feet.
.MONDAY, Southwest winds 5 to 15 knots backing south late. Waves
subsiding to calm to 2 feet.
.MONDAY NIGHT, Southeast winds 5 to 15 knots veering south after
midnight. Waves calm to 2 feet.
.TUESDAY, South winds 5 to 15 knots backing southeast by mid
afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT, Southeast winds 5 to 15 knots veering south
after midnight. Waves building to 1 to 3 feet.
.WEDNESDAY, South winds 5 to 15 knots. A chance of showers.
Waves 1 to 3 feet.
.THURSDAY, South winds 5 to 15 knots veering southwest. A chance
of showers. Waves subsiding to calm to 2 feet.

$$

LSZ265-170400-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
347 PM EDT Sun May 16 2021

.LATE THIS AFTERNOON, Variable winds around 10 knots or less.
Waves calm to 2 feet.
.TONIGHT, Southeast winds 5 to 15 knots veering south after
midnight, then becoming southwest 10 to 20 knots late. Patchy
dense fog after midnight. Waves building to 1 to 3 feet, then
subsiding to calm to 2 feet.
.MONDAY, Southwest winds 10 to 20 knots backing south in the
afternoon, then backing east late. Waves calm to 2 feet.
.MONDAY NIGHT, Southeast winds 10 to 20 knots becoming south
5 to 15 knots after midnight. Waves calm to 2 feet.
.TUESDAY, South winds 5 to 15 knots becoming southeast 10 to
20 knots by mid afternoon. Waves building to 1 to 3 feet.
.TUESDAY NIGHT, South winds 10 to 20 knots. A chance of showers
after midnight. Waves 1 to 3 feet.
.WEDNESDAY, South winds 10 to 20 knots. A chance of showers.
Waves subsiding to calm to 2 feet.
.THURSDAY, South winds 10 to 20 knots. A chance of showers.
Waves calm to 2 feet.

$$

LSZ266-170400-
Lake Superior East of a line from Manitou Island to Marquette MI
and West of a line from Grand Marais MI to the US/Canadian Border
Beyond 5NM from shore-
347 PM EDT Sun May 16 2021

.LATE THIS AFTERNOON, Variable winds around 10 knots or less.
Waves calm to 2 feet.
.TONIGHT, South winds 10 to 20 knots. Patchy dense fog after
midnight. A slight chance of rain showers after midnight. Waves
building to 2 to 4 feet, then subsiding to 1 to 3 feet.
.MONDAY, South winds 10 to 20 knots backing east late. Waves
subsiding to calm to 2 feet.
.MONDAY NIGHT, Southeast winds 10 to 20 knots veering south
after midnight. Waves calm to 2 feet.
.TUESDAY, South winds 10 to 20 knots backing southeast by mid
afternoon. Waves building to 1 to 3 feet.
.TUESDAY NIGHT, South winds 10 to 20 knots. Waves building to
2 to 4 feet, then subsiding to 1 to 3 feet.
.WEDNESDAY, South winds 10 to 20 knots. A chance of showers.
Waves 1 to 3 feet.
.THURSDAY, South winds 10 to 20 knots. A chance of showers.
Waves 1 to 3 feet.

$$

LSZ267-170400-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
347 PM EDT Sun May 16 2021

.LATE THIS AFTERNOON, Variable winds around 10 knots or less.
Waves calm to 2 feet.
.TONIGHT, South winds 10 to 20 knots. Patchy fog after midnight.
Waves building to 1 to 3 feet.
.MONDAY, South winds 10 to 20 knots backing east late. Waves
subsiding to calm to 2 feet.
.MONDAY NIGHT, South winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY, South winds 5 to 15 knots backing southeast by mid
afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT, South winds 10 to 20 knots. Waves calm to
2 feet.
.WEDNESDAY, South winds 10 to 20 knots. A chance of showers.
Waves building to 1 to 3 feet.
.THURSDAY, South winds 10 to 20 knots. A chance of showers.
Waves subsiding to calm to 2 feet, then building to 1 to 3 feet.

$$
LSZ261-170400-
MAFOR 1621/
Superior West 14800 11800 12510 11410. Waves 2 feet or less.

Superior North Central 14800 11800 13510. Waves 1 to 3 feet.

Superior South Central 14800 11800 12400 11300. Waves 1 to 3
feet.

Superior East 14800 11800 12410 11300. Waves 1 to 3 feet.

LSZ162-170200-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
505 PM EDT Sun May 16 2021 /405 PM CDT Sun May 16 2021/

.Tonight...
Weather.............Partly cloudy, then patchy fog after midnight.
Sfc winds...........North 5 to 10 knots.
100-ft winds........North 10 to 15 knots.
Sig waves...........1 to 3 feet.

.MONDAY...
Weather.............Mostly sunny with patchy fog, then mostly sunny
                              in the afternoon.
Sfc winds...........South 10 to 15 knots.
100-ft winds........South 15 to 20 knots.
Sig waves...........2 to 4 feet.

.MONDAY NIGHT...
Weather.............Mostly clear.
Sfc winds...........Northeast 5 to 10 knots.
100-ft winds........Northeast 10 to 15 knots.
Sig waves...........1 to 3 feet.

.TUESDAY...
Weather.............Mostly sunny.
Sfc winds...........Northeast 5 to 10 knots.
100-ft winds........Northeast 10 to 15 knots.
Sig waves...........1 to 3 feet.

.TUESDAY NIGHT...
Weather.............Partly cloudy, then mostly cloudy with chance
                              of showers after midnight.
Sfc winds...........Northeast 10 to 15 knots.
100-ft winds........Northeast 15 to 20 knots.
Sig waves...........2 to 4 feet.


.FORECAST DAYS 3 THROUGH 5...

.WEDNESDAY...Patchy fog. Chance of showers. slight chance of
showers in the evening, then chance of showers after midnight.
Southeast winds 10 to 15 knots. Waves 3 to 5 feet.
.THURSDAY...Chance of showers. Southeast winds 10 to 15 knots.
Waves 4 to 6 feet.
.FRIDAY...Chance of showers. South winds 10 to 15 knots. Waves
3 to 5 feet.

$$

LSZ263-170200-
Lake Superior from Saxon Harbor WI to Upper Entrance to Portage
Canal MI 5NM off shore to the US/Canadian border including Isle
Royale National Park-
505 PM EDT Sun May 16 2021

.Tonight...
Weather.............Partly cloudy, then mostly cloudy with patchy
                              fog after midnight.
Sfc winds...........Northeast 5 to 10 knots becoming east 10 to 15
                              knots after midnight.
100-ft winds........Northeast 10 to 15 knots becoming east 15 to 20
                              knots after midnight.
Sig waves...........2 to 4 feet.

.MONDAY...
Weather.............Mostly sunny with patchy fog, then mostly sunny
                              in the afternoon.
Sfc winds...........South 10 to 15 knots.
100-ft winds........South 15 to 20 knots.
Sig waves...........2 to 4 feet.

.MONDAY NIGHT...
Weather.............Mostly clear.
Sfc winds...........Northeast 5 to 10 knots.
100-ft winds........Northeast 10 to 15 knots.
Sig waves...........2 to 4 feet.

.TUESDAY...
Weather.............Sunny.
Sfc winds...........East 5 to 10 knots.
100-ft winds........East 10 to 15 knots.
Sig waves...........1 to 3 feet.

.TUESDAY NIGHT...
Weather.............Partly cloudy, then mostly cloudy with chance
                              of showers after midnight.
Sfc winds...........East 10 to 15 knots becoming southeast after
                              midnight.
100-ft winds........East 15 to 20 knots becoming southeast after
                              midnight.
Sig waves...........2 to 4 feet.


.FORECAST DAYS 3 THROUGH 5...

.WEDNESDAY...Patchy fog. Chance of showers. slight chance of
showers in the evening, then chance of showers after midnight.
Southeast winds 10 to 15 knots. Waves 3 to 5 feet.
.THURSDAY...Chance of showers. Southeast winds 10 to 15 knots.
Waves 4 to 6 feet.
.FRIDAY...Chance of showers. South winds 10 to 15 knots. Waves
3 to 5 feet.

$$

LSZ264-170200-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
505 PM EDT Sun May 16 2021

.Tonight...
Weather.............Partly cloudy, then mostly cloudy with a slight
                              chance of showers and patchy fog after
                              midnight.
Sfc winds...........Southeast 10 to 15 knots.
100-ft winds........Southeast 15 to 20 knots.
Sig waves...........2 to 4 feet.

.MONDAY...
Weather.............Partly sunny with a slight chance of showers
                              and patchy fog, then partly sunny in the
                              afternoon.
Sfc winds...........Southwest 10 to 15 knots.
100-ft winds........Southwest 15 to 20 knots.
Sig waves...........2 to 4 feet.

.MONDAY NIGHT...
Weather.............Mostly clear.
Sfc winds...........East 5 to 10 knots.
100-ft winds........East 10 to 15 knots.
Sig waves...........2 to 4 feet.

.TUESDAY...
Weather.............Mostly sunny.
Sfc winds...........East 5 to 10 knots becoming south in the
                              afternoon.
100-ft winds........East 10 to 15 knots becoming south in the
                              afternoon.
Sig waves...........2 to 4 feet.

.TUESDAY NIGHT...
Weather.............Partly cloudy, then patchy fog after midnight.
Sfc winds...........Southeast 10 to 15 knots.
100-ft winds........Southeast 15 to 20 knots.
Sig waves...........2 to 4 feet.
Ocnl waves..........Around 5 feet.


.FORECAST DAYS 3 THROUGH 5...

.WEDNESDAY...Patchy fog. Chance of showers. slight chance of
showers in the evening, then chance of showers after midnight.
Southeast winds 10 to 15 knots. Waves 3 to 5 feet.
.THURSDAY...Chance of showers. Southeast winds 10 to 15 knots.
Waves 4 to 6 feet.
.FRIDAY...Chance of showers. South winds 10 to 15 knots. Waves
3 to 5 feet.

$$

LSZ265-170200-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
505 PM EDT Sun May 16 2021

.Tonight...
Weather.............Partly cloudy, then patchy fog after midnight.
Sfc winds...........East 10 to 15 knots becoming south after
                              midnight.
100-ft winds........East 15 to 20 knots becoming south after
                              midnight.
Sig waves...........2 to 4 feet.

.MONDAY...
Weather.............Mostly sunny with patchy fog, then mostly sunny
                              in the afternoon.
Sfc winds...........South 10 to 15 knots becoming east 5 to 10
                              knots in the afternoon.
100-ft winds........South 15 to 20 knots becoming east 10 to 15
                              knots in the afternoon.
Sig waves...........2 to 4 feet.

.MONDAY NIGHT...
Weather.............Mostly clear.
Sfc winds...........East 5 to 10 knots becoming southeast after
                              midnight.
100-ft winds........East 10 to 15 knots becoming southeast after
                              midnight.
Sig waves...........1 to 3 feet.

.TUESDAY...
Weather.............Sunny.
Sfc winds...........South 5 to 10 knots becoming southeast 10 to 15
                              knots in the afternoon.
100-ft winds........South 10 to 15 knots becoming southeast 15 to
                              20 knots in the afternoon.
Sig waves...........2 to 4 feet.

.TUESDAY NIGHT...
Weather.............Partly cloudy, then mostly cloudy with chance
                              of showers after midnight.
Sfc winds...........Southeast 10 to 15 knots.
100-ft winds........Southeast 15 to 20 knots.
Sig waves...........2 to 4 feet.
Ocnl waves..........Around 5 feet.


.FORECAST DAYS 3 THROUGH 5...

.WEDNESDAY...Patchy fog. Chance of showers. slight chance of
showers in the evening, then chance of showers after midnight.
Southeast winds 10 to 15 knots. Waves 3 to 5 feet.
.THURSDAY...Chance of showers. Southeast winds 10 to 15 knots.
Waves 4 to 6 feet.
.FRIDAY...Chance of showers. South winds 10 to 15 knots. Waves
3 to 5 feet.

$$

LSZ266-170200-
Lake Superior East of a line from Manitou Island to Marquette MI
and West of a line from Grand Marais MI to the US/Canadian Border
Beyond 5NM from shore-
505 PM EDT Sun May 16 2021

.Tonight...
Weather.............Partly cloudy.
Sfc winds...........Southeast 15 to 20 knots.
100-ft winds........Southeast 20 to 25 knots.
Sig waves...........2 to 4 feet building to 3 to 5 feet after
                              midnight.
Ocnl waves..........Around 5 feet after midnight.

.MONDAY...
Weather.............Partly sunny with a slight chance of showers
                              and patchy fog, then mostly sunny in the
                              afternoon.
Sfc winds...........South 10 to 15 knots.
100-ft winds........South 15 to 20 knots.
Sig waves...........3 to 5 feet subsiding to 2 to 4 feet in the
                              afternoon.
Ocnl waves..........Around 5 feet in the morning.

.MONDAY NIGHT...
Weather.............Mostly clear.
Sfc winds...........North 5 to 10 knots becoming southeast 10 to 15
                              knots after midnight.
100-ft winds........North 10 to 15 knots becoming southeast 15 to
                              20 knots after midnight.
Sig waves...........2 to 4 feet.

.TUESDAY...
Weather.............Sunny.
Sfc winds...........Southeast 10 to 15 knots.
100-ft winds........Southeast 15 to 20 knots.
Sig waves...........2 to 4 feet.

.TUESDAY NIGHT...
Weather.............Partly cloudy, then patchy fog after midnight.
Sfc winds...........Southeast 10 to 15 knots.
100-ft winds........Southeast 15 to 20 knots.
Sig waves...........2 to 4 feet.
Ocnl waves..........Around 5 feet.


.FORECAST DAYS 3 THROUGH 5...

.WEDNESDAY...Patchy fog. Chance of showers. slight chance of
showers in the evening, then chance of showers after midnight.
Southeast winds 10 to 15 knots. Waves 3 to 5 feet.
.THURSDAY...Chance of showers. Southeast winds 10 to 15 knots.
Waves 4 to 6 feet.
.FRIDAY...Chance of showers. South winds 10 to 15 knots. Waves
3 to 5 feet.

$$

LSZ267-170200-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
505 PM EDT Sun May 16 2021

.Tonight...
Weather.............Partly cloudy.
Sfc winds...........East 10 to 15 knots becoming south after
                              midnight.
100-ft winds........East 15 to 20 knots becoming south after
                              midnight.
Sig waves...........2 to 4 feet.

.MONDAY...
Weather.............Mostly sunny.
Sfc winds...........Southeast 10 to 15 knots.
100-ft winds........Southeast 15 to 20 knots.
Sig waves...........2 to 4 feet.

.MONDAY NIGHT...
Weather.............Mostly clear.
Sfc winds...........Northeast 5 to 10 knots becoming southeast
                              after midnight.
100-ft winds........Northeast 10 to 15 knots becoming southeast
                              after midnight.
Sig waves...........1 to 3 feet.

.TUESDAY...
Weather.............Sunny.
Sfc winds...........Southeast 5 to 10 knots.
100-ft winds........Southeast 10 to 15 knots.
Sig waves...........1 to 3 feet.

.TUESDAY NIGHT...
Weather.............Mostly clear, then patchy fog after midnight.
Sfc winds...........Southeast 10 to 15 knots.
100-ft winds........Southeast 15 to 20 knots.
Sig waves...........2 to 4 feet.


.FORECAST DAYS 3 THROUGH 5...

.WEDNESDAY...Patchy fog. Chance of showers. slight chance of
showers in the evening, then chance of showers after midnight.
Southeast winds 10 to 15 knots. Waves 3 to 5 feet.
.THURSDAY...Chance of showers. Southeast winds 10 to 15 knots.
Waves 4 to 6 feet.
.FRIDAY...Chance of showers. South winds 10 to 15 knots. Waves
3 to 5 feet.

$$

LSZ261-170200-
MAFOR 1621/
Superior West 12200 11800 12500 12510 11410. Waves 2 feet or
less.

Superior North Central 12310 11410 14510 11510. Waves 1 to 3
feet.

Superior South Central 11310 11320 12420 11410 12400 11300. Waves
1 to 3 feet.

Superior East 12310 13420 12410 11300. Waves 1 to 3 feet.

$$

 

Occasional waves will only be displayed when values meet or exceed 5 feet.

 

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