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Today, strong winds will push a few airsheds into FAIR to EXCELLENT dispersion, especially in the eastern plains.
On the 19th, as the
upper level ridge breaks down, dispersion returns to FAIR to VERY GOOD conditions in
Montana and northern and central Idaho, while southern Idaho remains POOR.
Almost all airsheds have GOOD
to EXCELLENT dispersion on the 20th and 21st, as a low
pressure system and associated cold front move through. This weather system is
expected to bring unsettled conditions with precipitation, increased winds, and
cooler temperatures.
By the 22nd and 23rd, colder
air moving in at the surface will result in widespread POOR conditions in much of Montana while Idaho remains FAIR to EXCELLENT.
Rebekah McCormick, NRCC Meteorologist