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Story summary
- Temperatures east of the Cascades are expected to near 100 °F during the heat wave.
- KATU issued a Weather Alert for the Willamette Valley as highs above 90 °F are forecast to begin Monday.
- Meteorologists define a heat wave as three consecutive days with highs exceeding 90 °F.
- Models indicate the heat will persist for at least four days.
- Tuesday is projected to be the hottest day, with temperatures reaching the mid-90s.
