Weather Update: Long Hot Spell Continues with Possible Thunderstorms and Late Storms Expected.
The May heat wave continues in the Pacific Northwest, with temperatures expected to stay in the 80s through at least Thursday. A thunderstorm is possible on Monday afternoon or evening, but it may be spotty. The warm weather is due to a high pressure system in Canada and weak onshore flow. The region hasn't seen a 7-day stretch at/above 80 in May since 1987.