Cold settles in overnight with start of autumn

Autumn arrives this evening, and appropriately, the National Weather Service is warning about the possibility of pockets of frost tonight. Dry air has accompanied highs in the 60s today as summer exits. Autumn begins at 8:09 p.m. With a dewpoint of 35 at Spokane International Airport this afternoon, it is possible that some locales may see frost. Temperatures generally stop falling when they approach the dewpoint. Forecasts for Spokane, Deer Park and Spokane Valley are calling for lows of 37 or 38. Daytime weather should remain mild through Friday and then warm up to near summer-like temperatures on Saturday and even Sunday. Highs will be in the middle 60s on Thursday and Friday. Lows will be in the lower to middle 40s. Breezy winds are likely Thursday afternoon. Saturday and Sunday could be choice days with highs near 76 in downtown Spokane under sunny skies to mostly sunny skies. A series of weak storm disturbances is expected starting on Thursday and then again on Saturday and Tuesday, but the impulses are not predicted to bring more than clouds and some breezes to the Spokane and Coeur d’Alene areas. Gusts Thursday could reach 23 mph. At 7 a.m. today, temperatures were more like autumn with readings in the upper 30s and lower 40s. It was 41 at Spokane International Airport with a dewpoint of 39. This afternoon’s dewpoint had dropped to 35, suggesting it may be colder tonight.