304
FNUS73 KDLH 101642
FWSDLH

Spot Forecast for Coast Guard CST Exercise...Coast Guard
National Weather Service Duluth MN
1142 AM CDT Wed Jun 10 2026

Forecast is based on forecast start time of 1200 CDT on June 10.
If there are questions or concerns with this forecast, or if
conditions become unrepresentative, contact the National
Weather Service in Duluth at 218-729-0653.

.DISCUSSION...

The main concern from about noon to 2 PM will be dense fog in the
harbor and over the nearshore waters of Lake Superior.
Visibilities may jump up and down a bit, but visibility less than
one mile is expected for the most part. Winds will be northeast
around 10 kt and gusting up to 20 kt. A round of thunderstorms is
expected to pass through this afternoon around 2-3 PM. The storms
may be strong to severe with large hail and strong winds. Expect
some changes in visibility when these roll through, with the dense
fog possibly lessening but visibility still remaining low due to
the heavy rain. Expect gusty and erratic winds with these storms,
and wind direction will likely switch at least briefly to more of
a southwesterly direction. Winds may become onshore again from the
northeast with additional lingering storms possible until around 7
PM or 8 PM. Then, winds are expected to switch more permanently to
southwesterly. This will help to clear out any lingering fog that
may persist through the afternoon.

.REST OF TODAY...

Sky/weather.........Mostly cloudy (70-80 percent). Areas of dense
                    fog early in the afternoon. Showers and
                    thunderstorms.
Chance of pcpn......90 percent.
Chance of thunder...64 percent.
Max temperature.....Around 71.
Surface winds (mph).Northeast winds 8 to 10 knots.
Wave Height.........Waves calm to 2 feet.
Wave period.........3 seconds.
Freezing Spray......None.
Ceiling (kft).......0.6 increasing to 2.3.
Visibility (sm).....1 increasing to 3.
Lake Surface Temp...44 Degrees Fahrenheit.
Wave Direction......70.

TIME (CDT)      12P 1PM 2PM 3PM 4PM 5PM
Sky cover.......MC  MC  MC  MC  MC  MC
Weather cov.....CHC CHC LKY DEF LKY DEF
Weather type....RNF RW  RW  RW  RW  RW
Tstm cov........CHC LKY DEF DEF LKY DEF
Chc of pcpn (%).30  50  70  90  90  80
Chc of thdr (%).30  60  60  60  50  50
Temp............51  54  56  61  63  64
Wave period (s).3   3   3   3   3   3
Wave height (ft)1   1   1   1   1   1
Freezing spray..
Ceiling (kft)...0.6 0.8 0.8 1.0 2.3 2.6
Visibility (sm).1   1   1   3   3   4
Surface wnd dir.NE  NE  NE  NE  NE  NE
Surface wnd spd.10  10  10  10  9   8
Surface wnd gst.15  15  15  15  15  13
Wave Direction..070 070 070 070 070 070
Wave period (s).3   3   3   3   3   3
Wave height (ft)1   1   1   1   1   1
Freezing spray..

.TONIGHT...

Sky/weather.........Mostly cloudy (60-70 percent) then becoming
                    mostly clear (15-25 percent). Showers and
                    thunderstorms likely in the evening.
Chance of pcpn......70 percent.
Chance of thunder...54 percent.
Min temperature.....Around 53.
Surface winds (mph).Northeast winds 6 to 7 knots shifting to the
                    west 8 to 9 knots late in the evening.
Wave Height.........Waves calm to 2 feet.
Wave period.........4 seconds.
Freezing Spray......None.
Ceiling (kft).......1.7 in the evening decreasing to 0.2 overnight.
Visibility (sm).....3 increasing to 6.
Lake Surface Temp...44 Degrees Fahrenheit.
Wave Direction......150.

TIME (CDT)      6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky cover.......MC  MC  MC  PC  MC  PC  MCR MCR MCR MCR MCR MCR
Weather cov.....LKY LKY CHC CHC
Weather type....RW  RW  RW  RW
Tstm cov........LKY LKY CHC CHC
Chc of pcpn (%).70  60  40  30  10  0   0   0   0   0   0   0
Chc of thdr (%).50  40  40  30  10  0   0   0   0   0   0   0
Temp............63  63  64  64  61  59  58  57  57  56  55  55
Wave period (s).3   3   3   4   4   4   4   4   4   4   4   4
Wave height (ft)1   1   1   1   1   1   1   1   1   1   1   1
Freezing spray..
Ceiling (kft)...1.7 3.0 4.2 4.6 5.0 5.5 7.0 6.2 3.7 0.2 0.2 0.2
Visibility (sm).4   3   3   4   6   7   7   7   7   7   7   7
Surface wnd dir.NE  N   NE  NW  W   SW  SW  SW  SW  W   W   W
Surface wnd spd.7   6   7   8   9   10  10  10  9   8   8   8
Surface wnd gst.12  10  11  13  16  16  17  17  15  14  14  14
Wave Direction..060 060 060 130 130 130 150 150 150 150 150 150
Wave period (s).3   3   3   4   4   4   4   4   4   4   4   4
Wave height (ft)1   1   1   1   1   1   1   1   1   1   1   1
Freezing spray..

$$
Forecaster...Josh
Requested by...Patrick Chamberlain
Type of request...MARINE
.TAG 2615302.0/DLH
.DELDT 06/10/26
.FormatterVersion 2.0.0
.EMAIL patrick.a.chamberlin2@uscg.mil