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Wildfire Smoke Update
for
Monday, September 12, 2016 10:24 AM

Satellite Photos | Locations and Smoke Conditions


Today's Report and Forecast Today's Summary
Air quality is GOOD in most locations today as wet and cold weather impacts the state. Air quality in West Yellowstone was UNHEALTHY earlier today, but has improved this morning and is currently MODERATE.

Most of the smoke that has been impacting West Yellowstone is likely from the Maple fire, which was 43,490 acres and 75% contained with active fire behavior yesterday. The Berry fire, located further south in the park, increased in fire activity yesterday, and was 16,800 acres and 50% contained with extreme fire behavior.

The cold air and unsettled weather is expected to continue today, with precipitation likely on both fires in Yellowstone National Park. Fire behavior should decrease over the next 24 hours due to the chilly temperatures and wet weather. Expect air quality to continue to improve in West Yellowstone throughout the day. Some air quality impacts may return overnight, if smoke settles into town, but any impacts should improve by mid-morning.

Elsewhere, air quality is expected to be GOOD throughout the day. A chilly start to Tuesday may cause some MODERATE impacts in western valleys due to wood stove smoke getting trapped under an inversion. Any air quality impacts should improve by about 10am. The unsettled weather is expected to continue through Wednesday as the low pressure center swings back up through the state.

Starting on Thursday, a ridge of high pressure is expected to settle over the state, bringing warm and dry weather back to the area. Any fires that remain active at that point may cause isolated smoke impacts once again.
Air quality is GOOD in most locations this morning. In West Yellowstone, concentrations remained elevated overnight, but have steadily decreased this morning as precipitation moves in. The unsettled weather is expected to keep air quality GOOD in most locations through Wednesday. Cold temperatures overnight tonight might cause brief MODERATE impacts in some western valleys tomorrow morning before improving by mid-day. Air quality in West Yellowstone should continue to improve throughout the day, with some smoke impacts possible tomorrow morning.
Residents near active fires and under plumes aloft need to remain aware of current conditions and use the visibility guidelines to guide their activity decisions as the situation changes.

Air Quality Bureau
Montana Department of Environmental Quality
Phone: (406) 444-3490
Email: DEQ-ARMB-Admin@mt.gov




The West Yellowstone webcam shows unsettled weather in the area this morning.  

The West Yellowstone webcam shows unsettled weather in the area this morning.
Source: West Yellowstone Webcams

 
Satellite shows widespread cloud cover over much of the state this morning.

Satellite shows widespread cloud cover over much of the state this morning.
Source: NOAA

Yesterday’s satellite smoke analysis shows fire activity increasing before the wet weather moved in.

Yesterday’s satellite smoke analysis shows fire activity increasing before the wet weather moved in.

Source: NOAA 

Current active fire locations are shown below.

Current active fire locations are shown below.
Source: USFS

Real time particulate information is currently available in most of the larger urban areas from MTDEQ's Today's Air website.

Today's particulate report below compares particulate levels received from DEQ's
reporting stations with MTDEQ’s Health Effect Categories.

Locations and severity of PM 2.5 particulate values over the past 24 hours from the time above.
Health Effects Categories City
  Hazardous  
  Very Unhealthy  
  Unhealthy  West Yellowstone (hourly levels have improved)
  Unhealthy for Sensitive Groups  
  Moderate

  

  Good

 All other reporting locations. 

B1(x) One-hour BAM value (number of values)
B8(x) Eight-hour average BAM
B24 24 hour  average BAM value
Local impacts in areas immediately adjacent to active fires are expected to exceed some or all of the advisory levels.  DEQ recommends the use of local visibility guidelines to evaluate possible health risks and make informed activity decisions.