635
FOCN45 CWWG 251300
SIGNIFICANT WEATHER DISCUSSION ISSUED BY THE PRAIRIE AND ARCTIC STORM
PREDICTION CENTRE OF ENVIRONMENT CANADA AT 7:00 AM CST TUESDAY
NOVEMBER 25 2025.
ALERTS IN EFFECT...NONE.
SYNOPTIC OVERVIEW...ALOFT, AN UPPER LOW IS OVER THE GULF OF ALASKA.
A SHORTWAVE IS OVER EASTERN MONTANA AND NORTH DAKOTA. NUMEROUS SMALL
UPPER LOWS ARE LOCATED ACROSS THE ARCTIC. MOST NOTABLE IS ONE OVER
THE MACKENZIE RIVER VALLEY, ONE OVER SOUTHERN HUDSON BAY, ANOTHER
NEAR SOUTHAMPTION ISLAND AND ONE LOCATED OVER THE SOUTHERN TIP OF
GREENLAND.
AT THE SURFACE, A RIDGE OF HIGH PRESSURE STRETCHES FROM THE BEAUFORT
SEA SOUTHWARD THROUGH THE YUKON, BC, AND SOUTHERN AB. A 1010 MB LOW
IS OVER THE DAKOTAS. A 1006 MB LOW IS OVER NORTHERN HUDSON BAY WITH A
TROUGH SOUTHWARD THROUGH ONTARIO. ANOTHER LOW IS LOCATED WITHIN THE
TROUGH, OVER NW ONTARIO. A 996 MB OCCLUDED LOW IS OVER SOUTHERN DAVIS
STRAIT.
DISCUSSION...
SOUTHERN SK/MB...THERE REMAINS A PRECIPITATION SHIELD OF LIGHT SNOW
OVER SOUTHEASTERN SK AND FAR SOUTHWESTERN MB THIS MORNING, FROM THE
SYSTEM THAT SPREAD AN AREA OF 10 TO 15 CM OF SNOW IN A CORRIDOR FROM
THE SOUTHERN ALBERTA FOOTHILLS TO CALGARY, AB, TO THE CYPRESS HILLS
TO ROCKGLEN, SK. THIS SNOW WILL CONTINUE TO MOVE ALONG THIS MORNING
INTO THE US NORTHERN PLAINS, LEAVING MINIMAL IMPACT OVER THE CANADIAN
PRAIRIE GROUND FOR THE REMAINDER OF ITS RESIDENCE.
SURFACE HIGH PRESSURE BUILDS BACK IN THE WAKE OF THIS SYSTEM, AND AN
AIR MASS WITH COOLER MORE SEASONAL TEMPERATURES. WITH THE COOLING AND
RELATIVELY MOIST BOUNDARY LAYER, A DIRTY RIDGE SEEMS TO BE THE
PREDOMINANT WEATHER FEATURE OVER THE PRAIRIES UNTIL THIS WEEKEND.
LIGHT SNOW AND CHASING TEMPERATURES WITHIN RAGGED LOW CLOUD SYSTEMS
LOOK TO BE THE FORECAST CHALLENGE OF THE WEEK.
NUNAVUT...PATCHY FOG, LOW STRATUS AND LIGHT FLURRIES WILL PERSIST
ACROSS MOST COMMUNITIES. POSSIBILITY EXISTS FOR WIDESPREAD BLSN IN
THE RESOLUTE AREA BEGINNING TONIGHT AND ON WEDNESDAY. GUSTS UP TO
70 KM/H ARE PROBABLE BUT WITH MINIMAL SNOWFALL TO ACCOMPANY IT, BLZD
DOES NOT LOOK LIKELY.
END/CARLSEN/VAN LOCHEM
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