Warmest Day Yet But Bad Air Is Building Up For Some

Posted at 6:40 PM, Oct 18, 2018
and last updated 2018-10-18 20:57:03-04

Thursday was day #5 in a row of a rex block weather pattern.  It’s been gorgeous, and Thursday’s highs were well up in the 60s and 70s for everyone.  The weather has not changed much with warm afternoon highs, and some areas like the valleys facing chilly overnight lows.  The Helena Valley, Blackfoot Valley, Seeley-Swan, Deer Lodge Area, Bitterroot Valley and the Flathead Valley has had lows in the 10s and 20s the last few mornings.  Slight inversions have slowly strengthened, meaning cool air and some pollution is able to build in the valley locations of western Montana.  At times, some of these valleys had “moderate” air quality on Thursday.  As this weather pattern continues, the air quality may deteriorate down to “moderate” again over the weekend and early next week.  This high pressure over Montana will stick around for that long, meaning not much change is likely.  A slight cool down for eastern Montana will happen on Friday, but Saturday will likely be the warmest day we’ll see in this stretch of above average temperatures.  Sunday will be slightly cooler but still in the 60s for highs.  It’s not until next Wednesday to Thursday that a Pacific storm will move in and break down the unusual weather pattern.


Curtis Grevenitz