SMI Northeast (Smoke Management Instructions) Northeast Oregon Smoke Management Instructions

Tue Apr 20 14:50:21 PDT 2010

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS
SALEM FORESTRY WEATHER CENTER
OREGON DEPARTMENT OF FORESTRY

ISSUED: Tuesday, April 20, 2010       2:35 PM      Jim Little

1.  DISCUSSION AND FORECAST FOR NORTHEAST FORECAST AREA ZONES 630-638

Upper air charts show a closed low over eastern California/western Nevada and an upper trough moving through British Columbia for Wednesday.  Subsidence aloft suppresses mixing heights a bit limiting smoke dispersal conditions to just fair.  Transport winds will be generally northwesterly.

    OUTLOOK (THURSDAY-SATURDAY)

The upper low drifts into Arizona and ridging builds in.  There will be a few scattered showers Thursday, but they will be on the decrease.  Mixing heights will recover for fair to good smoke dispersal conditions.  High pressure and fair weather is likely for Friday and Saturday.  Maximum mixing heights will be quite high and smoke dispersal conditions will depend mainly on local wind directions and speed.

2.  DISPERSION

WEDNESDAY

Zone 630 and 632:
Mixing height 1100 - 2100 ft during the morning.  Afternoon mixing height rises to 2500 - 3500 ft then lowers to 1200 - 2200 ft during the evening.

Transport wind NW to NNW at 14 - 28 mph.

Surface wind NW to NNW at 10 - 18 mph throughout the day.

Zone 633 - 638:
Mixing height 1400 - 2400 ft during the morning.  Afternoon mixing height rises to 2500 - 3500 ft then lowers to 1000 - 1600 ft during the evening.

Transport wind NW to N at 6 - 12 mph throughout the day.

Surface wind WNW to NNW at 5 - 9 mph.

OUTLOOK:

THURSDAY
In the west mixing height 1200 to 2200 ft during the morning rising to 3500 to 4500 ft during the afternoon.  In the east mixing height below 1000 ft during the morning rising to 3500 to 4500 ft during the afternoon.  In the west transport wind NNW to N at 10 - 22 mph during the morning becoming NNW to NNE at 14 - 28 mph during the afternoon.  In the east transport wind NW to N at 8 - 12 mph during the morning becoming NNW to NNE at 10 - 22 mph during the afternoon.  Surface wind NW to N at 5 - 9 mph during the morning becoming NNW to NNE at 10 - 18 mph during the afternoon.

FRIDAY
Mixing height below 1000 ft early rising to 2500 to 3500 ft by late morning rising above 5000 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.

SATURDAY
Mixing height below 1000 ft early rising to 4300 to 5000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming WNW to NNW at 4 - 8 mph during the afternoon.  Surface wind light and variable.

3.  BURNING INSTRUCTIONS FOR NORTHEAST OREGON ZONES 630-638
    The following considerations should be adhered to in addition to
    the requirements of the Oregon Smoke Management Plan. These
    Instructions are valid for burning conducted on Wednesday, April 21, 2010.
    ==================================================================

Zone 630 and 632:
Unfavorable burning situation due to very poor smoke dispersion.  Avoid ignitions within 20 miles to the NW through NNW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 35 miles to the NW through N in or near drainages leading to SSRAs.  Recommend against burning units that will smolder significantly overnight.

Zone 633 - 638:
Unfavorable burning situation due to very poor smoke dispersion.  Avoid ignitions within 20 miles to the WNW through N of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 35 miles to the WNW through NNE in or near drainages leading to SSRAs.  Recommend against burning units that will smolder significantly overnight.

    =========================================================
4.  SPECIAL NOTE:

    The smoke management forecaster is available at (503)-
    945-7401. Please call this number and not individual's
    numbers to discuss daily burning.  For large burns (over
    2000 tons) or burns extending over a considerable period,
    please request a special forecast.  Avoid calling before
    8 a.m. and between 2 to 3 p.m.

    This forecast is available on the Internet at:
      http://oregon.gov/ODF/FIRE/fire.shtml/#Smoke_Management

    Please ensure your units have been planned and accomplished by checking:
      http://oregon.gov/ODF/FIRE/SMP/dailysmoke.shtml

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