* WHAT...DANGEROUSLY HOT CONDITIONS WITH TEMPERATURES BETWEEN 95 AND100 DEGREES F POSSIBLE.

* WHERE...GREATER PORTLAND METRO, CENTRAL WILLAMETTE VALLEY, WESTERN COLUMBIA RIVER GORGE, LOWER COLUMBIA RIVER, INNER VANCOUVER METRO, AND EAST CLARK COUNTY LOWLANDS.

* WHEN...FROM SUNDAY MORNING THROUGH TUESDAY EVENING.

* IMPACTS...HEAT RELATED ILLNESSES INCREASE SIGNIFICANTLY DURING EXTREME HEAT EVENTS.

* ADDITIONAL DETAILS...PEAK HEATING DAYS WILL BE SUNDAY AND MONDAY WITH THE POTENTIAL FOR A SLIGHT COOL DOWN ON TUESDAY. OVERNIGHT TEMPERATURES WILL REMAIN ELEVATED SUNDAY NIGHT INTO MONDAY MORNING, AND MONDAY NIGHT INTO TUESDAY MORNING. NIGHT TIME TEMPERATURES RANGING FROM 60-65 DEGREES WILL LEAD TO POOR OVERNIGHT RECOVERY WITH LESS RELIEF. THERE IS CURRENTLY AROUND A 10% CHANCE OF EXTREME HEATRISK FOR PORTLAND PROPER AND THE WEST HILLS ON MONDAY, WITH A 25% CHANCE OF A HIGH TEMPERATURE OF 100 DEGREES F. CONDITIONS REMAIN ELEVATED ON TUESDAY, THOUGH CONFIDENCE IS LOWER IN REGARDS TO WHETHER SIGNIFICANT HEAT WILL PERSIST.