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Wildfire Smoke Update
for
Saturday, July 21, 2012 9:15 PM

Satellite Photos | Locations and Smoke Conditions


Today's Report and Forecast Today's Summary
Air quality is GOOD across the state again today. There are only very minor smoke impacts across far eastern Montana and far western Montana, from fires in Canada to the east, and California and the Bitterroot to the west.

The ridge of high pressure has created poor dispersion conditions, so while there are few active fires across the state, even nuisance smoke from around the region is slowly having cumulative effects. These are the areas that we will continue to be concerned about tomorrow as we have another hot and dry day with poor dispersion and a chance for thunderstorms. However, air quality is not expected to exceed MODERATE conditions. By Monday, a low pressure system will track over the Northern Rockies to bring good dispersion, but also a chance for more widespread rain and thunderstorms as well as gusty winds along a cold front. Conditions will be cooler, but drier and windy on Tuesday, already prompting fire concerns.
Air quality is GOOD across the state today. Only minor nuisance smoke is penetrating areas in far western and far eastern Montana. We should expect much of the same tomorrow, but with increased chances for thunderstorms. An active weather system and cold front on Monday, followed by gusty winds on Tuesday will cause more fire concern early next week.
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: DEQMTSmoke@mt.gov




This is the visible satellite image from 12:30 this afternoon showing mostly clear skies across the heart of the state, with some clouds to the northwest and southeast. 

This is the visible satellite image from 12:30 this afternoon showing mostly clear skies across the heart of the state, with some clouds to the northwest and southeast.


 





This morning’s analysis from NOAA’s satellite services division shows the active fires in Montana and the smoke plumes combining and spreading downwind (the analyzed smoke is based on yesterday’s satellite coverage, the fire detects are based on last nights satellite coverage).

This morning’s analysis from NOAA’s satellite services division shows the active fires in Montana and the smoke plumes combining and spreading downwind (the analyzed smoke is based on yesterday’s satellite coverage, the fire detects are based on last nights satellite coverage).

Red indicates hot spot detected. Green represents thin smoke, yellow is moderate smoke, and pink is dense smoke. Fire size is exaggerated for visibility at this scale. To identify individual fires on graphic above go here: http://activefiremaps.fs.fed.us/lg_fire2.php 




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  
  Unhealthy for Sensitive Groups  
  Moderate

  

  Good

 All reporting sites 

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.