Airshed
Management
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Burn Recommendations

Last Updated: 2019-03-25 11:34:11.419248 MST
Idaho

No Restrictions

AS 22

#174014 – Monitor downwind smoke impacts/dispersion to surrounding area, limit impact to roadways and Mountain Home AFB.

Montana

No Restrictions

AS 6

#176523 and #176524 - Monitor downwind smoke impacts/dispersion to surrounding Helena area, adjust accordingly.


Meteorology/Dispersion Discussion

Last Updated: 2019-03-26 06:33:00.361016 MST

Tuesday March 26 Discussion: Southwest flow aloft today will bring good dispersion to most western airsheds. A large-scale upper trough will move through ID/MT tomorrow through Thursday, maintaining good dispersion most western airsheds into Friday. 

MARGINAL-GOOD dispersion Today ID and Western MT under SW flow aloft. S-SW surface winds. Rain/snow Central ID. GOOD-EXCELLENT dispersion in Central/Eastern MT with SW-W surface winds.

MARGINAL-GOOD dispersion North/Central ID and Western MT Wednesday under weak SW flow aloft. Light NE-E surface winds North ID/Western MT and S-SW in South ID and SW MT. Scattered showers. GOOD-EXCELLENT dispersion Central/Eastern MT with NW-NE surface winds. 

GOOD-EXCELLENT dispersion ID and Western MT Thursday under broad upper trough. NE-E surface winds North ID/Western MT. Rain/Snow. SW-W winds South ID. GOOD-EXCELLENT dispersion Central/Eastern MT with NE-E surface winds. Rain/snow, heavy Central MT along/near mountains. 

MARGINAL-GOOD dispersion Friday ID and Western MT under broad upper trough. W-NW surface winds North ID/Western MT except NE near Continental Divide. W-NW winds South ID/SW MT. GOOD dispersion Central/Eastern MT with NW-NE surface winds. 

MARGINAL-GOOD dispersion Saturday ID and Western MT under weak ridging. Light SW-W surface winds. GOOD dispersion Central/Eastern MT with SW-W surface winds. 

GOOD dispersion Sunday ID and Western MT under weak upper trough. SW-W surface winds. Scattered showers. GOOD-EXCELLENT dispersion Central/Eastern MT with W-NW surface winds. 

MARGINAL-GOOD dispersion Monday ID and Western MT under WNW flow aloft. Light/variable surface winds except SW-W South ID. Scattered showers Western MT. GOOD dispersion Central/Eastern MT with N-E surface winds. 

Wednesday 27 March Dispersion Forecast

MONTANA
Northwest (AS 1, 2): MARGINAL 01. GOOD 02.
West Central (AS 3A, 3B, 4, 5, 6): GOOD. 
Southwest (AS 7, 8A, 8B): GOOD.
Central/Eastern (AS 9, 10): Excellent in AS 09, Good in AS 10. 

IDAHO:

North (AS 11): MARGINAL. 

North Central (AS 12A, 12B, 13): MARGINAL. 

West Central (AS 14, 15, 21A): MARGINAL.

East Central (AS 16, 17): MARGINAL. 

Northeast (AS 18, 19): GOOD. 

Southeast (AS 20): GOOD.

Southwest (AS 21B, 22, 23, 24, 25): GOOD. 


Prepared by Michael Richmond and Coleen Haskell Meteorologists, NRCC