The first freeze of the fall could have hit the Tri-Cities overnight, with the National Weather Service forecasting a low of 32 degrees early this morning at the Pasco airport.
Tonight is expected to be even colder, possibly bringing a hard freeze to the Tri-Cities. The weather service is predicting a low early Wednesday morning of about 28 degrees at the Pasco airport. Temperatures closer to the Columbia River should be a couple of degrees warmer.
It issued a freeze warning for all of the Mid-Columbia from 1 a.m. today to 10 a.m. Wednesday.
A cold front has brought much colder and drier air to the region, and clear skies and light winds are causing temperatures to fall to freezing or below in the region.