FPCN11 CWNT 201813 AAA UPDATED FORECASTS FOR THE GREAT SLAVE LAKE AND MACKENZIE RIVER AREAS OF THE NORTHWEST TERRITORIES ISSUED BY ENVIRONMENT CANADA AT 12:13 P.M. MDT SATURDAY 20 JUNE 2026 FOR TODAY AND SUNDAY. THE NEXT SCHEDULED FORECAST WILL BE ISSUED AT 4:00 P.M. MDT. FT. SIMPSON REGION INCLUDING JEAN MARIE RIVER. TODAY..MAINLY CLOUDY WITH 30 PERCENT CHANCE OF SHOWERS AND RISK OF A THUNDERSTORM. HIGH 22. UV INDEX 5 OR MODERATE. TONIGHT..PARTLY CLOUDY. LOW 11. SUNDAY..A MIX OF SUN AND CLOUD. 30 PERCENT CHANCE OF SHOWERS IN THE AFTERNOON. HIGH 24. UV INDEX 6 OR HIGH. REMAINDER UNCHANGED. END