469
WWCN12 CWTO 271439
YELLOW WARNING - RAINFALL
FOR NORTHERN ONTARIO
UPDATED BY ENVIRONMENT CANADA
AT 10:39 A.M. EDT MONDAY 27 APRIL 2026.
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YELLOW LEVEL WARNING - RAINFALL - FOR:
=NEW= CITY OF THUNDER BAY
=NEW= SUPERIOR WEST
=NEW= LAKE NIPIGON - WABAKIMI
NIPIGON - MARATHON - SUPERIOR NORTH.
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IMPACT LEVEL: HIGH
FORECAST CONFIDENCE: MODERATE
==DISCUSSION==
RAIN, AT TIMES, HEAVY, IS EXPECTED. THE FROZEN OR NEARLY SATURATED
GROUND HAS A REDUCED ABILITY TO ABSORB THIS RAINFALL.
WHAT:
RAINFALL AMOUNTS OF 25 TO 40 MM.
WHEN:
BEGINNING THIS AFTERNOON OR EARLY EVENING AND DIMINISHING TUESDAY
MORNING.
ADDITIONAL INFORMATION:
SIGNIFICANT RAINFALL WILL AFFECT MUCH OF NORTHWESTERN ONTARIO AS
WELL AS REGIONS AROUND LAKE SUPERIOR. CONFIDENCE IN HEAVY RAINFALL
AMOUNTS IS HIGHEST FOR REGIONS ALONG THE SHORES OF LAKE SUPERIOR.
THE RAINFALL WARNING HAS BEEN EXPANDED AS THE MOST RECENT ANALYSIS
SUGGESTS THE RAINFALL AMOUNTS COULD BE HIGHER THAN ORIGINALLY
ANTICIPATED.
AREAS NEAR LAKE NIPIGON MAY TRANSITION TO SNOW OVERNIGHT OR TUESDAY
MORNING.
LOCALIZED FLOODING IS POSSIBLE. SOME ROADS MAY BECOME IMPASSABLE.
DON'T DRIVE THROUGH FLOODED ROADWAYS. STAY AWAY FROM RIVERS, CREEKS
AND CULVERTS.
FOR INFORMATION CONCERNING FLOODING, PLEASE CONSULT YOUR LOCAL
CONSERVATION AUTHORITY OR ONTARIO MINISTRY OF NATURAL RESOURCES
OFFICE. VISIT HTTPS://WWW.ONTARIO.CA/PAGE/FLOODS FOR THE LATEST
DETAILS.
PLEASE CONTINUE TO MONITOR ALERTS AND FORECASTS ISSUED BY
ENVIRONMENT CANADA. TO REPORT SEVERE WEATHER, SEND AN EMAIL TO
ONSTORM(AT)EC.GC.CA OR POST REPORTS ON X USING (HASH)ONSTORM.
HTTP://WEATHER.GC.CA
END/OSPC
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