719
FOCN45 CWWG 171900
SIGNIFICANT WEATHER DISCUSSION ISSUED BY THE PRAIRIE AND ARCTIC STORM
PREDICTION CENTRE OF ENVIRONMENT CANADA AT 2:00 PM CDT THURSDAY APRIL
17 2025.
ALERTS IN EFFECT...WINTER STORM WATCHES FOR GJOA HAVEN AND RESOLUTE.
SYNOPTIC OVERVIEW...ALOFT, AN UPPER RIDGE IS OVER THE EASTERN
PACIFIC, ALASKA AND THE YUKON. AN UPPER LOW IS OVER NORTHERN
SASKATCHEWAN AND MANITOBA WITH A DIGGING TROUGH EXTENDING
SOUTHWESTWARD. AN UPPER RIDGE IS OVER ONTARIO. AN UPPER LOW IS OVER
NORTHERN BAFFIN BAY WITH A TROUGH SOUTHEASTWARD TO ANOTHER LOW OVER
SOUTHERN LABRADOR.
AT THE SURFACE, AN OCCLUDING 1007 MB LOW HAS NOW MOVED INTO
NORTHWESTERN ONTARIO. TROUGH EXTENDING FROM THIS LOW JUST CLIPPING
SOUTHEAST MANITOBA. A RIDGE OF HIGH PRESSURE EXTENDS SOUTHWARD FROM
NEAR VICTORIA ISLAND THROUGH SOUTHERN KIVALLIQ AND INTO NORTHEASTERN
ONTARIO. A 990 MB LOW IS OVER LABRADOR.
DISCUSSION...
WESTERN PRAIRIES...THE LOW PRESSURE SYSTEM NEAR REINDEER LAKE
CONTINUES TO GIVE LIGHT SNOW TO NORTHERN SASKATCHEWAN. AS THE SYSTEM
CONTINUES TO MOVE SOUTHEASTWARD TODAY, THE SNOW WILL END AND SKIES
WILL BEGIN TO CLEAR FROM THE NORTHWEST.
NORTHERLY FLOW OVER ALBERTA IS CONTINUING TO PUSH A WEAK
SHORTWAVE SOUTHWARD ACROSS CENTRAL AND SOUTHERN PORTIONS OF THE
PROVINCE. PRECIPITATION WITH THIS SHORTWAVE WILL EVENTUALLY CHANGE
OVER TO A RAIN/SNOW MIX AS TEMPERATURES WARM THROUGH THE AFTERNOON.
THE PRECIPITATION IS EXPECTED TO INTENSIFY SOMEWHAT AS IT IS PUSHED
UP AGAINST THE TERRAIN.
EASTERN PRAIRIES...AS MENTIONED IN THE EARLY MORNING BULLETIN, SNOW
ASSOCIATED WITH THE SYSTEM OVER NORTHERN MANITOBA HAS DIMINISHED
SUFFICIENTLY TO END THE SNOWFALL WARNINGS, ALTHOUGH A FEW CM IS STILL
POSSIBLE IN THE NORTHEAST. WIDESPREAD FLURRIES, AT TIMES HEAVY WILL
CONTINUE TODAY ASSOCIATED WITH THE UPPER LOW/TROUGH FROM NORTHERN MB
INTO CENTRAL SK.
LINGERING TROUGH OVER EXTREME SOUTHEAST MANITOBA WAS BOLSTERED BY THE
DEVELOPMENT AND ISENTROPIC ASCENT OF A LOW PASSING THROUGH THE US
NORTHERN PLAINS. SHOWERS HAVE REDEVELOPED HERE AND WILL CONTINUE INTO
THE EVENING, WITH 10-20 MM EXPECTED.
THURSDAY NIGHT INTO FRIDAY MORNING, THERE WILL BE COOLER TEMPERATURES
AND WIDESPREAD LIGHT FLURRIES AND SHOWERS OVER CENTRAL AND SOUTHERN
MANITOBA IN THE NORTHWEST FLOW BEHIND THE EXITING SYSTEM.
NWT...FRIDAY MORNING, A NEW LOW PRESSURE SYSTEM WILL BEGIN TO DEVELOP
IN THE NWT. GUIDANCE IS SHOWING A BAND OF HEAVY SNOW FROM SOUTH DELTA
REGION TO KUGLUKTUK WITH A CHANCE OF FREEZING RAIN JUST TO THE SOUTH
OF THIS BAND. UPWARDS OF 10CM OF SNOW IS POSSIBLE IN THE SOUTH DELTA
REGION ON FRIDAY AND SIMILARLY IN KUGLUKTUK THAT NIGHT. AS THIS
SYSTEM DEEPENS AND TRACKS EASTWARDS THROUGH THE WEEKEND, BLIZZARD
CONDITIONS ARE EXPECTED IN BOTH RESOLUTE AND GJOA HAVEN, WHERE WINTER
STORM WATCHES ARE IN EFFECT. THESE WATCHES WILL BE UPGRADED TO
BLIZZARD WARNINGS WITH THE AFTERNOON FORECAST ISSUE.
NUNAVUT...THE LOW OVER LABRADOR CONTINUES TO TRACK NORTHWARD TOWARDS
BAFFIN ISLAND, BRINGING ANOTHER WAVE OF SNOW TODAY. THIS NEXT SYSTEM
WILL PULL MILD AIR NORTHWARD, WHICH WILL LIMIT SNOWFALL AMOUNTS AND
CURRENT MODEL GUIDANCE IS INDICATING THE HEAVIEST SNOWFALL WILL BE
LIMITED TO HIGHER TERRAIN.
END/FULTON/GREENHOUGH
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