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Monday, December 7th, 2009 - 05:55:38

SPECIAL WEATHER STATEMENT ISSUED BY ENVIRONMENT CANADA ONTARIO REGION.
5:47 AM EST MONDAY 7 DECEMBER 2009.

SPECIAL WEATHER STATEMENT ISSUED FOR..

SIGNIFICANT STORM ON TAP FOR NORTHEASTERN ONTARIO.

A DEVELOPING LOW PRESSURE SYSTEM LOCATED OVER NEVADA THIS MORNING IS SETTING ITS SIGHTS ON NORTHEASTERN ONTARIO. THIS STORM WILL CLEAR THE ROCKY MOUNTAINS TUESDAY MORNING AND THEN TURN NORTHEASTWARD TOWARDS THE GREAT LAKES BASIN GATHERING MOISTURE FROM THE GULF OF MEXICO ALONG THE WAY. WEATHER PREDICTION MODELS ARE NEARLY UNANIMOUS IN INTENSIFYING THIS LOW AND TRACKING IT OVER LAKE HURON BY WEDNESDAY EVENING AND THEN ON TO SOUTHWESTERN QUEBEC BY THURSDAY MORNING.

PRECIPITATION ASSOCIATED WITH THIS SYSTEM WILL BEGIN AS LIGHT SNOW TUESDAY EVENING INTO WEDNESDAY MORNING. THIS LOW MAY USHER RELATIVELY MILD AIR INTO NORTHEASTERN ONTARIO CAUSING THE SNOW TO CHANGE OVER TO RAIN AND THEREBY LIMITING SNOWFALL AMOUNTS.

THE BULK OF THE SNOW IS EXPECTED TO FALL WEDNESDAY INTO WEDNESDAY EVENING. TYPICALLY, SNOWFALL AMOUNTS WITH THESE TYPES OF STORMS CAN RANGE FROM 20 TO 30 CENTIMETRES ALONG AND NORTH OF THE LOW TRACK. THIS MAY BE THE CASE WITH THIS STORM AS WELL. A CAVEAT TO NOTE HOWEVER IS THAT ANY AREA THAT SEES THE SNOW TO CHANGE TO RAIN COULD
HAVE MUCH LOWER SNOWFALL AMOUNTS.

ANOTHER ELEMENT OF THIS STORM THAT WILL BE SIGNIFICANT IS STRONG WINDS BOTH AHEAD OF THE SYSTEM ON WEDNESDAY AND IN ITS WAKE ON THURSDAY. STRONG EASTERLY WINDS MAY WHIP THE FRESHLY FALLEN SNOW CAUSING BLOWING SNOW AND REDUCED VISIBILITY. ONCE THE LOW PASSES, COLD WESTERLY WINDS FLOWING OVER THE GREAT LAKES WILL SET UP ANOTHER LAKE EFFECT EVENT FOR SNOW BELT AREAS ON THURSDAY.

ENVIRONMENT CANADA WILL CONTINUE TO MONITOR THIS DEVELOPING SITUATION CLOSELY.