Great Lakes Forecast
Issued by NWS

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FZUS63 KDTX 202048
GLFSC

LAKE ST CLAIR FORECAST
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
348 PM EST MON FEB 20 2017

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...HIGH PRESSURE...30.20 INCHES...WILL GRADUALLY DIMINISH
THROUGHOUT THE EVENING AND OVERNIGHT HOURS LEADING INTO TUESDAY...AS
A LOW PRESSURE SYSTEM PUSHES NORTHEAST FROM MANITOBA INTO NORTHERN
ONTARIO...PRESSURE WILL DECREASE DOWN TO 29.90 INCHES OVER THE GREAT
LAKES BY TUESDAY AFTERNOON...AND WILL CONTINUE TO GRADUALLY DECREASE
AS A SURFACE LOW...29.40...TRAVELS FROM THE CENTRAL PLAINS INTO THE
NORTHERN GREAT LAKES WEDNESDAY INTO THURSDAY.

LCZ460-210915-
LAKE ST CLAIR-
348 PM EST MON FEB 20 2017

.TONIGHT...SOUTHEAST WINDS 10 TO 15 KNOTS. PARTLY CLOUDY UNTIL EARLY
MORNING...BECOMING MOSTLY CLOUDY. WAVES 2 FEET OR LESS.
.TUESDAY...SOUTHEAST WINDS 10 TO 15 KNOTS...BECOMING SOUTHWEST 5 TO
10 KNOTS IN THE LATE MORNING AND AFTERNOON. CLOUDY. LIGHT SHOWERS
LIKELY IN THE LATE MORNING AND AFTERNOON. WAVES 2 FEET OR LESS.
.TUESDAY NIGHT...SOUTHWEST WINDS 5 TO 10 KNOTS IN THE EVENING...
BECOMING LIGHT AND VARIABLE, THEN...BECOMING SOUTHWEST 5 TO 10 KNOTS
EARLY IN THE MORNING. PARTLY CLOUDY. A CHANCE OF LIGHT SHOWERS EARLY
IN THE EVENING. WAVES 2 FEET OR LESS.
.WEDNESDAY...SOUTHWEST WINDS 5 TO 10 KNOTS. PARTLY SUNNY. WAVES
2 FEET OR LESS.
.WEDNESDAY NIGHT...SOUTH WINDS 5 TO 10 KNOTS...BECOMING SOUTHWEST
10 TO 15 KNOTS IN THE LATE EVENING AND EARLY MORNING, THEN...
DIMINISHING TO 5 TO 10 KNOTS EARLY IN THE MORNING. PARTLY CLOUDY.
WAVES 2 FEET OR LESS.
.THURSDAY...SOUTHWEST WINDS 5 TO 10 KNOTS...VEERING TO THE NORTHWEST
IN THE AFTERNOON, THEN...VEERING TO THE NORTHEAST IN THE EVENING.
PARTLY SUNNY, THEN MOSTLY CLOUDY WITH A CHANCE OF RAIN IN THE
EVENING. WAVES 2 FEET OR LESS.
.FRIDAY...SOUTH WINDS 15 TO 20 KNOTS. RAIN WITH THUNDERSTORMS
LIKELY. WAVES 2 FEET OR LESS.
.SATURDAY...WEST WINDS 20 TO 25 KNOTS. MOSTLY CLOUDY WITH RAIN WITH
THUNDERSTORMS LIKELY. WAVES 1 TO 3 FEET. A SMALL CRAFT ADVISORY MAY
BE NEEDED.

$$

SF

EXPERIMENTAL MODERNIZED OPEN LAKE FORECAST IS AVAILABLE ONLINE AT
WEATHER.GOV/DTX/GLFTABLESC (ALL LOWER CASE)

GRAPHICAL MARINE FORECASTS ARE AVAILABLE ONLINE AT
WEATHER.GOV/GREATLAKES (ALL LOWER CASE)



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