350
FOCN45 CWWG 151900
SIGNIFICANT WEATHER DISCUSSION ISSUED BY THE PRAIRIE AND ARCTIC STORM
PREDICTION CENTRE OF ENVIRONMENT CANADA AT 2:00 PM CDT WEDNESDAY
OCTOBER 15 2025.
ALERTS IN EFFECT...WIND WARNING FOR PARTS OF THE NWT.
SYNOPTIC OVERVIEW...ALOFT, UPPER AIR ANALYSIS SHOWING A DEEP UPPER
LOW OVER NORTHERN QUEBEC, WITH UPPER RIDGING OVER THE SOUTHEASTERN
PRAIRIES, AND AN UPPER TROUGH OVER THE WESTERN USA. UPPER LOW OVER
THE HIGH ARCTIC.
LATEST SURFACE ANALYSIS SHOWING A 1003 MB LOW OVER DAVIS STRAIT.
RIDGE OF HIGH PRESSURE OVER THE SOUTHERN PRAIRIES. 993 MB LOW OVER
GREAT SLAVE LAKE.
DISCUSSION...
AB...FOG COULD DEVELOP TONIGHT OVER PARTS OF EASTERN ALBERTA.
OTHERWISE NO SIGNIFICANT WEATHER IS EXPECTED.
SK/MB...NIL SIG WX TODAY. ATTENTION TURNS SOUTH WHERE A NEW SYSTEM
WILL DEVELOP IN THE NORTHERN PLAINS THURSDAY AND STREAM MOISTURE
NORTHWARDS TOWARDS SOUTHERN MANITOBA. THIS SYSTEM WILL INTENSIFY AS
IT TRAVELS INTO NORTHERN MANITOBA AND THE TONGUE OF MOISTURE WILL
WRAP AROUND THE LOW AND CONVERGE ON THE NORTHWESTERN FLANK OF THE LOW
OVER SOUTHERN MANITOBA. THIS WILL RESULT IN WIDESPREAD SHOWERS ACROSS
SOUTHERN MANITOBA AND SOUTHEASTERN SASKATCHEWAN BEGINNING THURSDAY
AND WILL INTENSIFY THURSDAY EVENING. ELEVATED INSTABILITY WILL ALSO
BE PRESENT, THUS ELEVATED CONVECTION WILL LIKELY DEVELOP THURSDAY
EVENING, ENHANCING LOCAL RAINFALL FOR SOME LOCAITONS. GENERALLY 10-25
MM IS EXPECTED ACROSS SOUTHERN MANITOBA WITH 30-50 MM POSSIBLE OVER
SOUTHWESTERN MANITOBA OVER A 48 HOUR PERIOD.
NT...LOW PRESSURE NORTH OF GREAT SLAVE LAKE WILL TRACK EASTWARD
ACROSS THE TERRITORY TODAY, BRINGING MIXED PRECIPITATION AND STRONG
WINDS. OVER POPULATED AREAS, PRECIPITATION WILL GENERALLY FALL AS
RAIN WITH 5-10 MM EXPECTED FOR REGIONS NORTH OF GREAT SLAVE LAKE AND
WEST OF GREAT BEAR LAKE. BEHIND THE LOW, RAIN WILL CHANGE TO SNOW,
THOUGH NO SIGNIFICANT ACCUMULATIONS ARE CURRENTLY EXPECTED.
A TIGHT PRESSURE GRADIENT AND STRONG PRESSURE RISES BEHIND THE LOW
WILL BRING STRONG WINDS TO THE NWT MAINLAND TODAY. A WIND WARNING
HAS BEEN ISSUED DUE TO THE RARITY OF STRONG WINDS IN THIS REGION.
GUSTS OF 70 TO 80KM/H ARE EXPECTED, WITH A FEW ISOLATED GUSTS UP TO
90 KM/H POSSIBLE. TULITA HAS ALREADY REPORTED GUSTS NEAR 70 KM/H.
STRONG WINDS WILL PERSIST INTO THE EVENING FOR AREAS SOUTH OF GREAT
SLAVE LAKE BEFORE EASING OVERNIGHT.
THE NEXT SYSTEM WILL BEGIN TO MOVE INTO THE NWT THURSDAY AFTERNOON
BRINGING ANOTHER DOSE OF MIXED PRECIPITATION AND STRONG WIND GUSTS.
NU...LOW OVER BAFFIN ISLAND WILL BRING SOME MIXED PRECIPITATION,
PARTICULARLY OVER HIGH TERRAIN. NO WARNING AMOUNTS ARE EXPECTED AT
ANY TOWNSITES. LOW OVER THE YUKON WILL MOVE TO IMPACT THE KIVALLIQ ON
THURSDAY, WITH PRECIPITATION MAINLY RAIN OR A RAIN/SNOW MIX.
END/FULTON/ZIOLKOWSKI/GRIFFITH/GERGELY
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