FOCN45 CWWG 131930
SIGNIFICANT WEATHER DISCUSSION ISSUED BY THE PRAIRIE AND ARCTIC
STORM PREDICTION CENTRE OF ENVIRONMENT CANADA AT 2:00 PM CST FRIDAY
DECEMBER 13 2024.

ALERTS IN EFFECT...BLIZZARD WARNING FOR CLYDE RIVER.

SYNOPTIC OVERVIEW...ALOFT, AN UPPER LOW IS OVER ALASKA. A RIDGE IS
OVER THE WESTERN PRAIRIES. A SHORTWAVE LOCATED VC GREAT SLAVE LAKE
IS RIDING THE CREST OF THE RIDGE. AN UPPER LOW IS NEAR VICTORIA
ISLAND WITH A TROUGH SOUTHEASTWARD TO ANOTHER LOW OVER SOUTHERN
DAVIS STRAIT. TROUGHING THEN EXTENDS SOUTHWARD THROUGH QUEBEC.

AT THE SURFACE, A LOW IS NEAR THE EASTERN TIP OF GREAT SLAVE LAKE
WITH A TROUGH SOUTHWARD THROUGH ALBERTA. ANOTHER TROUGH EXTENDS
NORTHWARD FROM THE LOW, TO VICTORIA ISLAND. A 1040 MB HIGH PRESSURE
CENTRE IS OVER WISCONSIN WITH A RIDGE AXIS NORTHWARD THROUGH
MANITOBA AND INTO EASTERN NUNAVUT. A DEEP, BUT SLOWLY FILLING LOW
IS NEAR THE ENTRANCE TO FROBISHER BAY.

DISCUSSION...

AB...FOG OVER SOUTHERN ALBERTA HAS THIS MORNING HAS MAINLY
DISSIPATED WITH JUST A FEW ISOLATED FOG PATCHES PERSISTING. WITH
SOME LOW LEVEL CONVERGENCE EXPECTED TO PERSIST FOR AT LEAST THE
NEXT 24 HOURS, WE MAY SEE THIS FOG RE-DEVELOP AGAIN OVERNIGHT OVER
EASTERN ALBERTA.

SATURDAY MORNING, WE WILL SEE A SYSTEM BEGIN TO MOVE INTO
NORTHWESTERN ALBERTA. THIS SYSTEM WILL BRING SOME SIGNIFICANT SNOW
TO PRIMARILY AREAS BETWEEN PEACE RIVER AND HIGH LEVEL AND THEN
EXTEND OUT TOWARDS FORT CHIPEWYAN AND FORT MCMURRAY BEFORE MOVING
OFF INTO NORTHERN SASKATCHEWAN BY SATURDAY NIGHT. AT THIS TIME,
THE HEAVIEST SNOW IS EXPECTED TO FALL BETWEEN THE MAIN COMMUNITIES
WITH TOTAL ACCUMULATIONS POSSIBLY AS HIGH AS 15 CM. SNOWFALL
WARNINGS WILL BE ISSUED THIS AFTERNOON ACROSS NORTHERN ALBERTA FOR
THIS INCOMING SYSTEM.

SK/MB...NIL SIG WX.

ARCTIC...IN THE TIGHT NORTHERLY GRADIENT ON THE BACKSIDE OF THE LOW
NEAR FROBISHER BAY, GUSTY WINDS AND REDUCED VISIBILITY IN SNOW AND
BLOWING SNOW WILL IMPACT MANY COMMUNITIES ON BAFFIN ISLAND,
MELVILLE PENINSULA, AND NORTHERN KIVALLIQ. AS THE LOW CONTINUES TO
WEAKEN TODAY, CONDITIONS WILL GRADUALLY IMPROVE.

BLIZZARD CONDITIONS AT CLYDE RIVER WILL IMPROVE FRIDAY EVENING AS
STRONG NORTHWESTERLY WINDS GUSTING TO 90 KM/H GRADUALLY DIMINISH.

A LOW PRESSURE CENTRE NEAR GREAT SLAVE LAKE IS BRINGING SNOWFALL
TO THE COMMUNITIES IN THE SOUTHERN MACKENZIE VALLEY AND MAINLY, TO
AREAS NORTH OF THE LAKE. GENERALLY 5 CM OF SNOW IS EXPECTED
TODAY BEFORE THE SNOW TAPERS OFF.

THE METEOROLOGICAL SERVICE OF CANADA IS INVESTIGATING THE
DISCONTINUATION OF THIS SIGNIFICANT WEATHER DISCUSSION. IF YOU USE
THIS BULLETIN AND HAVE ANY COMMENTS OR CONCERNS, PLEASE CONTACT US
AT FOCN45@EC.GC.CA WITH THE SUBJECT: "SIGNIFICANT WEATHER
DISCUSSION FEEDBACK". INCLUDE YOUR ORGANIZATION AND HOW YOU USE
THIS PRODUCT.

END/DYKES/GREENHOUGH