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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
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
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