FPCN11 CWNT 181639 FORECASTS FOR THE GREAT SLAVE LAKE AND MACKENZIE RIVER AREAS OF THE NORTHWEST TERRITORIES ISSUED BY ENVIRONMENT CANADA AT 11:00 A.M. MDT MONDAY 18 MAY 2026 FOR TODAY AND TUESDAY. THE NEXT SCHEDULED FORECAST WILL BE ISSUED AT 4:00 P.M. MDT. THEBACHA REGION INCLUDING FT. SMITH - SALT RIVER RESERVE. TODAY..SUNNY. HIGH 15. UV INDEX 4 OR MODERATE. TONIGHT..A FEW CLOUDS. LOW PLUS 5. TUESDAY..SUNNY. BECOMING A MIX OF SUN AND CLOUD IN THE AFTERNOON. WIND BECOMING SOUTH 20 KM/H IN THE AFTERNOON. HIGH 20. UV INDEX 5 OR MODERATE. LUTSEL K'E REGION. TODAY..SUNNY. WIND BECOMING SOUTH 20 KM/H THIS AFTERNOON. HIGH 11. UV INDEX 4 OR MODERATE. TONIGHT..A FEW CLOUDS. WIND BECOMING SOUTHEAST 20 KM/H NEAR MIDNIGHT. LOW PLUS 4. TUESDAY..A MIX OF SUN AND CLOUD. HIGH 16. UV INDEX 4 OR MODERATE. FT. RESOLUTION REGION INCLUDING HWY. 6. TODAY..MAINLY SUNNY. WIND SOUTHEAST 30 KM/H GUSTING TO 50. HIGH 16. UV INDEX 4 OR MODERATE. TONIGHT..PARTLY CLOUDY. WIND SOUTHEAST 30 KM/H GUSTING TO 50 BECOMING LIGHT THIS EVENING. LOW 7. TUESDAY..SUNNY IN THE MORNING THEN A MIX OF SUN AND CLOUD WITH 30 PERCENT CHANCE OF SHOWERS LATE IN THE AFTERNOON. HIGH 18. UV INDEX 5 OR MODERATE. HAY RIVER REGION INCLUDING ENTERPRISE. TODAY..SUNNY. BECOMING A MIX OF SUN AND CLOUD THIS AFTERNOON. WIND SOUTH 30 KM/H GUSTING TO 50. HIGH 19. UV INDEX 5 OR MODERATE. TONIGHT..PARTLY CLOUDY. WIND SOUTH 30 KM/H GUSTING TO 50 BECOMING LIGHT THIS EVENING. LOW 7. TUESDAY..A MIX OF SUN AND CLOUD. 30 PERCENT CHANCE OF SHOWERS LATE IN THE AFTERNOON WITH RISK OF A THUNDERSTORM. HIGH 17. UV INDEX 5 OR MODERATE. FT. PROVIDENCE REGION INCLUDING KAKISA - CHAN LAKE. TODAY..SUNNY EARLY THIS AFTERNOON THEN A MIX OF SUN AND CLOUD WITH 30 PERCENT CHANCE OF SHOWERS THIS AFTERNOON. RISK OF A THUNDERSTORM LATE THIS AFTERNOON. HIGH 20. UV INDEX 5 OR MODERATE. TONIGHT..PARTLY CLOUDY WITH 30 PERCENT CHANCE OF SHOWERS EARLY THIS EVENING. OTHERWISE CLEAR. RISK OF A THUNDERSTORM EARLY THIS EVENING. LOW 6. TUESDAY..INCREASING CLOUDINESS EARLY IN THE MORNING. 30 PERCENT CHANCE OF SHOWERS LATE IN THE AFTERNOON WITH RISK OF A THUNDERSTORM. HIGH 17. UV INDEX 3 OR MODERATE. FT. SIMPSON REGION INCLUDING JEAN MARIE RIVER. TODAY..A MIX OF SUN AND CLOUD. HIGH 24. UV INDEX 5 OR MODERATE. TONIGHT..PARTLY CLOUDY. LOW 9. TUESDAY..INCREASING CLOUDINESS EARLY IN THE MORNING. 30 PERCENT CHANCE OF SHOWERS IN THE AFTERNOON. HIGH 18. UV INDEX 3 OR MODERATE. FT. LIARD REGION INCLUDING NAHANNI BUTTE - SAMBAA K'E. TODAY..A MIX OF SUN AND CLOUD. WIND SOUTHWEST 20 KM/H GUSTING TO 40. HIGH 22. UV INDEX 5 OR MODERATE. TONIGHT..PARTLY CLOUDY. BECOMING CLOUDY NEAR MIDNIGHT. WIND SOUTHWEST 20 KM/H GUSTING TO 40 BECOMING LIGHT THIS EVENING. LOW 10. TUESDAY..CLOUDY WITH 30 PERCENT CHANCE OF SHOWERS. HIGH 17. UV INDEX 3 OR MODERATE. YELLOWKNIFE REGION. TODAY..MAINLY SUNNY. WIND SOUTHEAST 40 KM/H GUSTING TO 60. HIGH 13. UV INDEX 4 OR MODERATE. TONIGHT..INCREASING CLOUDINESS THEN 30 PERCENT CHANCE OF SHOWERS LATE THIS EVENING. CLEARING BEFORE MORNING. WIND SOUTHEAST 40 KM/H GUSTING TO 60 DIMINISHING TO 20 THIS EVENING. LOW 6. TUESDAY..SUNNY. BECOMING A MIX OF SUN AND CLOUD IN THE AFTERNOON. WIND SOUTHEAST 20 KM/H. HIGH 16. UV INDEX 4 OR MODERATE. NORTH SLAVE REGION INCLUDING WEKWEETI - WHATI - BEHCHOKO. TODAY..A MIX OF SUN AND CLOUD WITH 30 PERCENT CHANCE OF SHOWERS. RISK OF A THUNDERSTORM LATE THIS AFTERNOON. WIND SOUTHEAST 20 KM/H GUSTING TO 40 BECOMING LIGHT THIS AFTERNOON. HIGH 17. UV INDEX 4 OR MODERATE. TONIGHT..PARTLY CLOUDY. 30 PERCENT CHANCE OF SHOWERS THIS EVENING AND AFTER MIDNIGHT. RISK OF A THUNDERSTORM EARLY THIS EVENING. LOW 6. TUESDAY..MAINLY CLOUDY. 30 PERCENT CHANCE OF SHOWERS LATE IN THE AFTERNOON WITH RISK OF A THUNDERSTORM. HIGH 13. UV INDEX 4 OR MODERATE. WRIGLEY REGION. TODAY..A MIX OF SUN AND CLOUD. WIND SOUTHEAST 20 KM/H GUSTING TO 40 BECOMING LIGHT THIS AFTERNOON. HIGH 20. UV INDEX 4 OR MODERATE. TONIGHT..MAINLY CLOUDY WITH 30 PERCENT CHANCE OF SHOWERS EARLY THIS EVENING. CLEARING NEAR MIDNIGHT. LOW PLUS 5. TUESDAY..MAINLY SUNNY. HIGH 18. UV INDEX 4 OR MODERATE. NORMAN WELLS - TULITA REGION. TODAY..A MIX OF SUN AND CLOUD. HIGH 20. UV INDEX 4 OR MODERATE. TONIGHT..PARTLY CLOUDY. LOW 6. TUESDAY..A MIX OF SUN AND CLOUD. 30 PERCENT CHANCE OF SHOWERS IN THE MORNING. WIND BECOMING WEST 20 KM/H NEAR NOON. HIGH 13. UV INDEX 4 OR MODERATE. FORT GOOD HOPE REGION. TODAY..A MIX OF SUN AND CLOUD. WIND WEST 20 KM/H GUSTING TO 40. HIGH 21. UV INDEX 4 OR MODERATE. TONIGHT..MAINLY CLOUDY. WIND WEST 20 KM/H GUSTING TO 40 BECOMING LIGHT THIS EVENING. LOW 6. TUESDAY..MAINLY CLOUDY. HIGH 13. UV INDEX 4 OR MODERATE. DELINE. TODAY..MAINLY SUNNY. HIGH 17. UV INDEX 4 OR MODERATE. TONIGHT..PARTLY CLOUDY. LOW PLUS 4. TUESDAY..MAINLY CLOUDY. CLEARING IN THE AFTERNOON. WIND BECOMING NORTHWEST 20 KM/H IN THE AFTERNOON. HIGH 10. UV INDEX 4 OR MODERATE. COLVILLE LAKE. TODAY..A MIX OF SUN AND CLOUD. HIGH 11. UV INDEX 4 OR MODERATE. TONIGHT..PARTLY CLOUDY. LOW PLUS 2. TUESDAY..MAINLY CLOUDY. HIGH 7. UV INDEX 4 OR MODERATE. END