247
FZUS63 KDTX 211315
GLFSC
LAKE ST CLAIR FORECAST
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
915 AM EDT TUE OCT 21 2025
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
LOW PRESSURE OF 29.40 INCHES TRACKS OVER LAKE SUPERIOR
TODAY, AND THROUGH NORTHERN LAKE HURON ON WEDNESDAY. MUCH COLDER
AIR WILL FILTER INTO THE GREAT LAKES REGION LEADING TO UNSETTLED
WEATHER AND HAZARDOUS CONDITIONS FOR SMALL BOATS.
LCZ460-212200-
LAKE ST CLAIR-
915 AM EDT TUE OCT 21 2025
..SMALL CRAFT ADVISORY IN EFFECT THROUGH LATE WEDNESDAY NIGHT
REST OF TODAY
SOUTHWEST WINDS 15 TO 20 KNOTS. GUSTS 25 KNOTS.
PARTLY SUNNY. LIGHT SHOWERS LIKELY LATE IN THE AFTERNOON. WAVES 1
TO 3 FEET.
TONIGHT
SOUTHWEST WINDS 20 TO 25 KNOTS INCREASING TO 30 KNOTS
EARLY IN THE MORNING. PARTLY CLOUDY UNTIL EARLY MORNING BECOMING
MOSTLY CLOUDY. LIGHT SHOWERS LIKELY UNTIL EARLY MORNING...THEN A
CHANCE OF LIGHT SHOWERS EARLY IN THE MORNING. WAVES 1 TO 3 FEET
BUILDING TO 2 TO 4 FEET IN THE LATE EVENING AND OVERNIGHT.
WEDNESDAY
SOUTHWEST WINDS TO 30 KNOTS DIMINISHING TO 20 TO 25
KNOTS WITH GUSTS TO 30 KNOTS IN THE LATE MORNING AND AFTERNOON.
LIGHT SHOWERS. WAVES 2 TO 4 FEET.
WEDNESDAY NIGHT
WEST WINDS 20 TO 25 KNOTS. GUSTS TO 30 KNOTS
EARLY IN THE EVENING. LIGHT SHOWERS EARLY IN THE EVENING...THEN
LIGHT SHOWERS LIKELY IN THE LATE EVENING AND EARLY MORNING. A CHANCE
OF LIGHT SHOWERS AFTER MIDNIGHT. WAVES 2 TO 4 FEET.
THURSDAY
WEST WINDS 15 TO 20 KNOTS. MOSTLY CLOUDY WITH A CHANCE
OF LIGHT SHOWERS IN THE MORNING...THEN PARTLY CLOUDY WITH LIGHT
SHOWERS LIKELY IN THE AFTERNOON AND EVENING. WAVES 1 TO 3 FEET.
FRIDAY
NORTHWEST WINDS 15 TO 20 KNOTS. MOSTLY CLEAR. WAVES 2 FEET
OR LESS.
SATURDAY
LIGHT AND VARIABLE WINDS. MOSTLY CLEAR. WAVES 2 FEET OR
LESS.
TF
EXPERIMENTAL MODERNIZED OPEN LAKE FORECAST IS AVAILABLE ONLINE AT
WEATHER.GOV/DTX/GLFTABLESC
GRAPHICAL MARINE FORECASTS ARE AVAILABLE AT WEATHER.GOV/GREATLAKES
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