781
FOCN45 CWWG 091300
SIGNIFICANT WEATHER DISCUSSION ISSUED BY THE PRAIRIE AND ARCTIC STORM
PREDICTION CENTRE OF ENVIRONMENT CANADA AT 7:00 AM CST TUESDAY
FEBRUARY 9 2010.
WARNINGS, WATCHES AND STATEMENTS..SPECIAL WEATHER STATEMENT FOR FOG
IN CENTRAL AND SOUTHERN ALBERTA.
OVERVIEW..1038 MB HIGH VICINITY ISLAND LAKE PUSHING SLOWLY SOUTHEAST.
RIDGE OF HIGH PRESSURE EXTENDING NORTH TO CENTRAL ARCTIC ISLANDS AND
SOUTHWEST TO THE DAKOTAS. ALOFT WEAKENING UPPER RIDGE OVER ALBERTA,
UPPER TROF OFF WEST COAST. WEAK LOW VICINITY CAMBRIDGE BAY.
DISCUSSION..
WRN PRAIRIES..EXTENSIVE FOG AND STRATUS IN A NORTH SOUTH LINE THRU
THE MIDDLE OF ALBERTA. ARCTIC HIGH OVER EASTERN PRAIRIES MAINTAINS
SOUTHERLY FLOW OF COLD AIR INTO ALBERTA RESULTING IN A FAIRLY STRONG
INVERSION. THIS IS TRAPPING LOW LEVEL MOISTURE AT OR NEAR THE SURFACE
AND PRODUCING FOG AND STRATUS. AREA IS GRADUALLY SHIFTING EASTWARDS
AS THE SURFACE RIDGE GRADUALLY MOVES INTO NORTHERN ONTARIO.
VISIBILITIES HAVE BEEN REPORTED DOWN TO 1/8 SM AND FOG COVERS A
LARGE AREA SOME FOG MAY PERSIST TILL NOON BEFORE DISSIPATING IN THE
AFTERNOON.
EASTERN PRAIRIES..ABOUT 5 CM OF SNOW ON WEDNESDAY FOR NORTHWESTERN
MANITOBA AND NORTHEASTERN SASKATCHEWAN ASSOCIATED WITH UPPER LOW
FORECAST TO DEVELOP THERE.
OTHERWISE NIL SIG WX.
END/APS/CMW
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