Great Lakes Forecast
Issued by NWS

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000
FZUS63 KDTX 230241
GLFSC

LAKE ST CLAIR FORECAST
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
941 PM EST MON DEC 22 2014

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...29.40 INCHES...WILL MOVE FROM IOWA
TONIGHT TO WISCONSIN BY TUESDAY EVENING...WEAKENING TO 29.70 INCHES.
THIS LOW WILL CONTINUE TO WEAKEN AS IT TRACKS INTO THE NORTHERN
GREAT LAKES TUESDAY NIGHT. A SECONDARY LOW PRESSURE SYSTEM IS
FORECAST TO DEVELOP OVER THE GULF COAST ON TUESDAY AND LIFT ALMOST
DUE NORTH TO LAKE HURON BY WEDNESDAY NIGHT. THIS SYSTEM IS FORECAST
TO RAPIDLY INTENSIFY AS IT ADVANCES INTO THE GREAT LAKES...THEN
CONTINUE TO STRENGTHEN AS IT LIFTS INTO CANADA BY THURSDAY MORNING.

LCZ460-230915-
LAKE ST CLAIR-
941 PM EST MON DEC 22 2014

...GALE WATCH IN EFFECT FROM WEDNESDAY EVENING THROUGH THURSDAY
MORNING...

.REST OF TONIGHT...EAST WINDS 10 TO 15 KNOTS. LIGHT SHOWERS AFTER
MIDNIGHT. WAVES 2 FEET OR LESS.
.TUESDAY...SOUTHEAST WINDS 10 TO 15 KNOTS...BECOMING SOUTH 5 TO
10 KNOTS BY AFTERNOON. LIGHT SHOWERS EARLY...THEN LIGHT SHOWERS
LIKELY LATE IN THE MORNING. A CHANCE OF LIGHT SHOWERS BY AFTERNOON.
WAVES 2 FEET OR LESS.
.TUESDAY NIGHT...SOUTHEAST WINDS 5 TO 10 KNOTS IN THE EVENING...
BECOMING LIGHT AND VARIABLE OVERNIGHT. CLOUDY. A CHANCE OF LIGHT
SHOWERS IN THE EVENING...THEN LIGHT SHOWERS LIKELY AFTER MIDNIGHT.
WAVES 2 FEET OR LESS.
.WEDNESDAY...SOUTHEAST WINDS 5 TO 10 KNOTS...INCREASING TO 10 TO
15 KNOTS LATE. RAIN. WAVES 2 FEET OR LESS.
.WEDNESDAY NIGHT...SOUTH WINDS 15 TO 20 KNOTS...BECOMING SOUTHWEST 20
TO 25 KNOTS WITH GUSTS TO 35 KNOT GALES LATE IN THE EVENING.. THEN
INCREASING TO 30 KNOTS WITH GUSTS TO 35 KNOT GALES AFTER
MIDNIGHT...DIMINISHING TO 20 TO 25 KNOTS WITH GUSTS TO 30 KNOTS LATE.
CLOUDY. A CHANCE OF SHOWERS EARLY IN THE EVENING...THEN A CHANCE OF
LIGHT SNOW SHOWERS BY LATE EVENING. WAVES 1 TO 3 FEET.. BUILDING TO
2 TO 4 FEET AFTER MIDNIGHT.
.THURSDAY...WEST WINDS 20 TO 25 KNOTS...BECOMING SOUTHWEST 10 TO
15 KNOTS. MOSTLY CLOUDY IN THE MORNING...BECOMING PARTLY CLOUDY.
WAVES 1 TO 3 FEET.
.FRIDAY...SOUTHWEST WINDS 10 TO 15 KNOTS. MOSTLY CLOUDY. A CHANCE OF
LIGHT SNOW SHOWERS. WAVES 2 FEET OR LESS.
.SATURDAY...WEST WINDS 15 TO 20 KNOTS. PARTLY CLOUDY. A CHANCE OF
LIGHT SNOW SHOWERS. WAVES 2 FEET OR LESS.

$$

RBP

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



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