FOCN45 CWWG 181900
SIGNIFICANT WEATHER DISCUSSION ISSUED BY THE PRAIRIE AND ARCTIC STORM
PREDICTION CENTRE OF ENVIRONMENT CANADA AT 2:00 PM CDT MONDAY MAY
18 2026.

ALERTS IN EFFECT...FROST ADVISORIES TO BE ISSUED FOR PORTIONS OF
ALBERTA, SASKATCHEWAN AND MANITOBA.

OVERVIEW...12Z UPPER AIR ANALYSIS SHOWING A DIGGING LOW OFF THE EAST
COAST OF HUDSON BAY WITH A TROUGH THROUGH THE CENTRAL PRAIRIES.
18Z SURFACE ANALYSIS SHOWS A RIDGE OF HIGH PRESSURE CENTRED OVER THE
MB/NU BOUNDARY. A LOW IS OFF THE NORTHERN LABRADOR COAST WITH A
TROUGH EXTENDING OVER SOUTHERN BAFFIN ISLAND.

DISCUSSION...

ALBERTA...IT WAS A COOL MORNING ACROSS MUCH OF CENTRAL AND SOUTHERN
ALBERTA THIS MORNING, WITH TEMPERATURES BETWEEN -3C AND +4C RECORDED.
TEMPERATURES HAVE (OBVIOUSLY) MODERATED, BUT ARE EXPECTED TO DIP TO
SIMILAR VALUES AGAIN TONIGHT. A FROST ADVISORY IS LIKELY FOR PORITONS
OF SOUTHERN ALBERTA, WITH RISKS OF FROST INCLUDED OVER CENTRAL AND
PARTS OF NORTHEASTERN ALBERTA.

THUNDERSTORMS POSSIBLE AGAIN TODAY ALONG THE FOOTHILLS AND IN CENTRAL
ALBERTA, HOWEVER LIMITED CAPE AND SHEAR AVAILABILITY WILL MEAN STORMS
THAT DO FIRE WILL BE SINGLE-CELL IN NATURE. BETTER INSTABILITY X
SHEAR PROFILES WILL EXIST TOMORROW AS AN UPPER LOW AND SOUTHWARD
EXTENT TROUGH MOVES INTO NORTHWESTERN ALBERTA, DESTABALIZING MUCH OF
ALBERTA AGAIN.

MANITOBA/SASKATCHEWAN...PRECIPITATION WILL TAPER OFF ACROSS THE
SOUTHERN PRAIRIES TODAY WITH A FEW PATCHES OF LIGHT RAIN OR DRIZZLE
POSSIBLE INTO THE EVENING AS THE LAST OF THE PRECIPITATION DRIFTS
ACROSS THE NTERLAKE AND RED RIVER VALLEY. FURTHER WEST, A FEW SHOWERS
WILL CONTINUE TO LINGER ACROSS PORTIONS OF WESTERN SASKATCHEWAN
TODAY.

TEMPERATURES WILL AGAIN DROP BELOW ZERO OVER PARTS OF SK/MB TONIGHT
TO BRING A CLOSE TO THE LONG WEEKEND.

THE NEXT SYSTEM TO IMPACT SOUTHERN MANITOBA WILL CLIP BY THE REGION
OVERNIGHT AS ANOTHER SURFACE LOW LIFTS NORTHEAST THROUGH MINNESOTA.
IT WILL SPREAD AN AREA OF RAIN ACROSS SOUTHEAST MANITOBA OVERNIGHT
WITH 2 TO 5 MM FOR THE SOUTHEAST CORNER OF THE PROVINCE.

AFTER THAT, TUESDAY WILL BE A QUIETER DAY, THEN AN IMPULSE PUSHING
INTO SOUTHERN SASKATCHEWAN WILL BRING RAIN SHOWERS WITH A RISK OF
THUNDERSTORMS TO THE REGION ON WEDNESDAY.

NWT/NU...THE SURFACE LOW OFF THE COAST OF LABRADOR WILL CONTINUE TO
SPREAD SNOW INTO PORTIONS OF SOUTHERN BAFFIN ISLAND OVER THE NEXT 24
TO 36 HOURS. A FURTHER 2 TO 5 CM IS EXPECTED IN IQALUIT AND KIMMIRUT.

OTHERWISE, NIL SIG WX FOR THE EASTERN ARCTIC.

LOW NORTH OF BANKS ISLAND WILL SLOWLY MOVE TO THE NORTHEAST BRINGING
SNOW AND SUSTAINED WINDS UP TO 40 KM/H TO RESOLUTE TONIGHT INTO
TUESDAY. A VERY WIDE RANGE IN SNOWFALL AMOUNTS HAS BEEN CONSISTENTLY
NOTED BETWEEN MODELS, ALTHOUGH THINGS ARE STARTING TO COME INTO LINE.
TOTAL AMOUNTS LOOK TO BE CLOSE TO 10 CM OF SNOW, WITH THE EXCEPTION
OF THE CANADIAN DETERMINISTIC, WHICH CONTINUES TO BE THE OUTLIER WITH
15+ CM. LOWER VISIBILITIES IN BLOWING SNOW ARE LIKELY OVERNIGHT INTO
TUESDAY (MOSTLY FOR SNOW BLOWING SIDEWAYS VS SNOW BEING LOFTED).

OTHERWISE A VERY SLIGHT CHANCE OF FREEZING DRIZZLE THROUGH THE
WESTERN ARCTIC AT THE COASTAL COMUNITIES TONIGHT.

END/FULTON/PIMISKERN