Airshed
Management
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Burn Recommendations

Last Updated: 2019-11-21 14:14:35.865339 MST
Idaho

The following units are restricted:

AS 11

#202289, #202291, #202666 – Due to marginal forecasted dispersion conditions and proximately impact zones

AS 12A

#202335 - Due to marginal forecasted dispersion conditions and size of unit

AS 12B

#202120 - Due to marginal forecasted dispersion conditions and size of unit/background PM 2.5 concentrations

AS 15

#200783 - Due to marginal forecasted dispersion conditions and size of unit

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AS 11

#202283 - Consider adjusting ignition in order to allow adequate venting, prior to evening settling. Confirm favorable wind direction/dispersion with test fire, adjust accordingly.  Monitor dispersion through the ignition and monitor conditions/PM 2.5 Concentrations at Coeur d’Alene monitor, adjust accordingly

#202330, #202707, #202716 - Consider adjusting ignition in order to allow adequate venting, prior to evening settling. Confirm favorable wind direction/dispersion with test fire, adjust accordingly.  Monitor dispersion through the ignition and monitor conditions/PM 2.5 Concentrations at Pinehurst monitor, adjust accordingly

Montana

No Restrictions

AS 1

#202432 - Consider adjusting ignition timing, if possible, in order to allow adequate venting, prior to evening settling. Confirm favorable wind direction/dispersion with test fire, adjust accordingly.  Monitor dispersion through the ignition and monitor conditions/PM 2.5 concentrations in Libby, adjust accordingly

#202017, #202018 - Consider adjusting ignition timing, if possible, in order to allow adequate venting, prior to evening settling. Confirm favorable wind direction/dispersion with test fire, adjust accordingly.  Monitor dispersion through the ignition and monitor conditions in HWY 2, adjust accordingly

AS 2

#202258 - Consider adjusting ignition timing, if possible, in order to allow adequate venting, prior to evening settling. Confirm favorable wind direction/dispersion with test fire, adjust accordingly.  Monitor dispersion through the ignition and monitor conditions in Plains, MT, adjust accordingly


Meteorology/Dispersion Discussion

Last Updated: 2019-11-22 07:20:15.536282 MST

Friday November 22 Discussion:  High pressure ridging has built in over Idaho and Western Montana and will maintain poor dispersion with strong valley inversions in Idaho and Western Montana today. Ridging will weaken slightly tomorrow as a disturbance in NW flow moves through east of the Divide but only slight improvement will occur in the Western Montana airsheds near the Divide, while it will be quite windy in Central/Eastern Montana. A stronger trough still looks to bring widespread improvement to Idaho and Western Montana Sunday. A broad upper troughing pattern is also still forecast to develop over Idaho and Montana from Monday on next week, which will be a more favorable dispersion pattern, but also a much colder and snowy one. After the first disturbance Monday, a NE low-level cold flow may take hold for next Tue/Wed, which would aid in dispersion for the western airsheds. This NE low-level push may continue into Thanksgiving day at least for the north half of ID and Western MT.

POOR-MARGINAL dispersion Today Idaho and Western Montana as upper ridging persists. Light westerly surface winds. GOOD-EXCELLENT dispersion Central/Eastern Montana in northwesterly flow aloft. Westerly surface winds.

POOR-MARGINAL dispersion Saturday Idaho and Western Montana as upper ridging persists. Light SW-W surface winds. GOOD-EXCELLENT dispersion Central/Eastern Montana under NW flow aloft with weak disturbance. Westerly surface winds, strong in Central MT.

MARGINAL-GOOD dispersion ID and Western MT Sunday as upper trough moves in. W-NW surface winds. Rain/mountain snow North/Central ID and Western MT. EXCELLENT dispersion in Central/Eastern MT under westerly flow aloft. Strong westerly surface winds.

MARGINAL-GOOD dispersion ID and Western MT Monday under broad upper trough. W-NW surface winds. Scattered rain/snow showers. GOOD dispersion in Central/Eastern MT under upper trough. NW-N surface winds. Scattered snow showers.

MARGINAL-GOOD dispersion Tuesday North/Central Idaho and Western Montana under broad upper trough. NE-E surface winds North ID/Western MT and SW-W winds Central/South ID and SW MT. Areas of snow. GOOD dispersion Central/Eastern Montana under light NW flow aloft. NW-NE surface winds As 09 and SE-E in As 10. 

MARGINAL-GOOD dispersion Wednesday North/Central Idaho and Western Montana under broad upper trough. NE-E surface winds. Scattered snow showers. GOOD-EXCELLENT dispersion Central/Eastern Montana under broad upper trough. NE-E surface winds.

MARGINAL-GOOD dispersion Thursday North/Central Idaho and Western/Montana under broad upper trough. N-E surface winds North and Central ID/Western/SW MT and SW-W winds South ID. Areas of snow. GOOD dispersion Central/Eastern Montana under light NW flow aloft. NW-NE surface winds As 09 and SE-E in As 10. 

Saturday 23 November Dispersion Forecast

MONTANA:

Northwest (AS 1, 2): POOR As 01. MARGINAL As 02. 

West Central (AS 3A, 3B, 4, 5, 6): MARGINAL. POOR As 04.

Southwest (AS 7, 8A, 8B): MARGINAL. 

Central/Eastern (AS 9, 10): EXCELLENT Central. GOOD Eastern.


IDAHO:

North (AS 11):  POOR.

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

West Central (AS 14, 15, 21A): POOR.

East Central (AS 16, 17): POOR.

Northeast (AS 18, 19):  MARGINAL. 

Southeast (AS 20): MARGINAL.

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


Prepared by Michael Richmond/Coleen Haskell, Meteorologists NRCC