Great Lakes Forecast
Issued by NWS

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000
FZUS63 KDTX 212041
GLFSC

LAKE ST CLAIR FORECAST
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
341 PM EST SUN DEC 21 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...HIGH PRESSURE...30.60 INCHES...OVER THE FAR EASTERN
GREAT LAKES WILL SLOWLY EXIT TO THE EAST TONIGHT. LOW PRESSURE IS
FORECAST TO DEVELOP OVER THE PLAINS TONIGHT AND DEEPEN TO 29.40
INCHES BY MONDAY MORNING. THIS LOW WILL SLOWLY TRACK FROM THE
CENTRAL PLAINS MONDAY TO THE UPPER GREAT LAKES BY TUESDAY EVENING
WHILE WEAKENING. A SECOND AREA OF LOW PRESSURE IS FORECAST TO
DEVELOP OVER THE GULF COASTAL REGION ON TUESDAY AND RAPIDLY
STRENGTHEN AS IT TRAVERSES THE EASTERN GREAT LAKES WEDNESDAY
AFTERNOON AND WEDNESDAY NIGHT.

LCZ460-220915-
LAKE ST CLAIR-
341 PM EST SUN DEC 21 2014

.TONIGHT...SOUTHEAST WINDS 5 TO 10 KNOTS. PARTLY CLOUDY. WAVES
2 FEET OR LESS.
.MONDAY...SOUTHEAST WINDS 5 TO 10 KNOTS...INCREASING TO 10 TO
15 KNOTS LATE. PARTLY SUNNY. WAVES 2 FEET OR LESS.
.MONDAY NIGHT...SOUTHEAST WINDS 5 TO 10 KNOTS...INCREASING TO 10 TO
15 KNOTS BY LATE EVENING. MOSTLY CLOUDY WITH LIGHT SHOWERS LIKELY.
WAVES 2 FEET OR LESS.
.TUESDAY...SOUTH WINDS 10 TO 15 KNOTS...DIMINISHING TO 5 TO 10 KNOTS
LATE. SHOWERS. WAVES 2 FEET OR LESS.
.TUESDAY NIGHT...SOUTHEAST WINDS 5 TO 10 KNOTS. CLOUDY WITH LIGHT
SHOWERS LIKELY. WAVES 2 FEET OR LESS.
.WEDNESDAY...SOUTHEAST WINDS 10 TO 15 KNOTS...BECOMING SOUTH 15 TO 20
KNOTS IN THE AFTERNOON...THEN BECOMING SOUTHWEST 20 TO 25 KNOTS WITH
GUSTS TO 30 KNOTS BY EVENING. RAIN SHOWERS. LIGHT SNOW SHOWERS
LIKELY BY EVENING. WAVES 1 TO 3 FEET. A SMALL CRAFT ADVISORY MAY
BE NEEDED.
.THURSDAY...SOUTHWEST WINDS 20 TO 25 KNOTS. GUSTS TO 30 KNOTS.
MOSTLY CLOUDY. LIGHT SNOW SHOWERS LIKELY. WAVES 1 TO 3 FEET.
.FRIDAY...WEST WINDS 10 TO 15 KNOTS. MOSTLY CLOUDY WITH A CHANCE OF
LIGHT SNOW SHOWERS. WAVES 2 FEET OR LESS.

$$

DRK/SC

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



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