Dangerous Heat and Possible Thunderstorms Later this Week

Impacts

● Near record high temperatures Thursday through this weekend could cause heat illnesses if overexerting. Stay out of the sun,

especially in the afternoon, and stay hydrated.

● Be careful if recreating in the rivers due to cold water temperatures especially just downstream of dams.

Forecast Confidence

● High confidence for near-record heat.

● Low confidence for thunderstorm coverage and locations.

Timing and Strength

● Heat

●

○ West of the Cascades, many of the inland valleys will see high temperatures between 101 and 106 degrees

Thursday through this weekend. Low temperatures may only fall into the middle to upper 60s Friday and Saturday

mornings. It will be a little cooler in the Umpqua Valley with highs peaking in the middle to upper 90s.

○ East of the Cascades, high temperatures in the valleys will be in the 90s.

● Cold Water

○ The colder river temperatures are only in the 50s and lower 60s.

● Thunderstorms

○ A slight chance of thunderstorms Friday through this weekend for mainly northern California and east of the

Cascades.

Weather Summary

High temperatures will range between 10 and 15 degrees above normal Thursday through this weekend. Excessive heat watches will

likely be issued followed by heat warnings and advisories. Record highs for Medford later this week are around 107 degrees, and for

Klamath Falls around 100 degrees. We do not expect these records to be reached but we could see temperatures peak to within a few

degrees of record highs across southern Oregon and northern California. Monsoonal moisture from the southwest U.S. may move toward

our region later in the week with thunderstorms possible beginning Friday afternoon.