https://forecast.weather.gov/product.php?site=BTV&issuedby=BTV&product=AFD&format=CI&version=1&glossary=1
As of 1045 AM EDT Sunday...As indicated in the last AFD, we
have now seen wildfire smoke seep southward into northern New
York and northern Vermont on light northerly winds. So as fog
lifted and low clouds dissipated, skies have remained overcast
consistent with hazy conditions. The lower visibilities
associated with near surface smoke are filling in as well,
evident in area webcams at places such as Alburgh and
Plattsburgh.
Rainfall isn`t expected to be as
widespread today given the best forcing will remain south of the
forecast area in the form of a decaying upper level low across
Pennsylvania. This tiny feature will have quite an interesting
impact of us today as it should allow for some scattered showers
and thunderstorms across the southern half of Vermont while
also ushering in smoke from Canadian wildfires across northern
Vermont and northern New York this afternoon.
The location of the decaying low to our south will switch our
surface winds to the north across northern Vermont and northern New
York this afternoon. Taking a look at air quality sensors across
Canada, there are high concentrations of the PM 2.5 which will
advect into the region this afternoon under these northerly winds.
We have been in contact with state partners and will likely be
issuing an air quality alert for northern counties.