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

ODF Smoke Management Instructions smi_northeast at listsmart.osl.state.or.us
Tue Dec 1 14:28:43 PST 2009


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

ISSUED: Tuesday, December 1, 2009       2:35 PM      Nick Yonker

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

Upper level ridge will continue to build along the coast today keeping the air mass stable and wind flow light.  Expect mostly fair skies with some fog in the low-lying regions.  Smoke dispersion will remain poor.

    OUTLOOK (THURSDAY - SATURDAY):

Upper level ridge begins to weaken Thursday as a dry cold front approaches.  Upper low behind the front will drop into the state from the north and bring much cooler conditions beginning Friday.  Wind flow turns onshore and increases.  As the low drops southward, cold arctic-like air will move in Saturday bringing the coldest conditions of the season.  Wind flow turns offshore to northerly.  Colder air moving in aloft plus increasing wind flow will improve smoke dispersion considerably on Saturday.

2.  DISPERSION

WEDNESDAY
Mixing height below 1000 ft during the morning.  Afternoon mixing height rising to 1000 - 1800 ft then lowering below 1000 ft during the evening.

Transport wind light and variable and controlled by local terrain.

Surface wind light and variable and controlled by local terrain.

OUTLOOK:

THURSDAY
Mixing height below 1000 ft during the morning rising to 1000 to 1700 ft during the afternoon.  Transport wind light and variable during the morning becoming SE to S at 5 - 9 mph during the afternoon.  Surface wind light and variable.

FRIDAY
Mixing height 1000 to 2000 ft during the morning rising to 2000 to 3000 ft during the afternoon.  Transport wind SW to WSW at 8 - 12 mph during the morning becoming WNW to NW at 12 - 24 mph during the afternoon.  Surface wind SW to W at 4 - 8 mph during the morning becoming WNW to NW at 10 - 18 mph during the afternoon.

SATURDAY
Mixing height below 1000 ft early rising to 2500 to 3500 ft by late morning rising to 4500 to 5000 ft during the afternoon.  Transport wind N to NNE at 15 - 25 mph.  Surface wind NNW to NNE at 9 - 15 mph.

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, December 2, 2009.
    ==================================================================

Unfavorable burning situation due to very poor smoke dispersion.  Delay ignitions until 10 a.m.  Avoid ignitions within 20 miles in all directions of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 35 miles in all directions of SSRAs.  Recommend against burning units that will smolder significantly overnight.  Complete ignitions by 3 p.m.

    =========================================================
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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