SMI South Central (Smoke Management Instructions) South Central Smoke Management Instructions

[ODF Smoke Management Instructions]

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

ISSUED: Tuesday, December 1, 2009       2:40 PM      Nick Yonker

1.  DISCUSSION AND FORECAST FOR SOUTH CENTRAL OREGON ZONES 624 AND 625

Upper level ridge will continue to build along the coast today keeping the air mass stable and wind flow light.  Expect mostly sunny skies.  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 later 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 rises to 1000 - 1700 ft then lowers 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 - 1700 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.

FRIDAY
Mixing height below 1000 ft during the morning rising to 1000 - 2000 ft during the afternoon.  Transport wind SSW to WSW at 8 - 12 mph during the morning becoming W to WNW at 15 - 30 mph during the afternoon.  Surface wind SSW to WSW at 5 - 9 mph during the morning becoming WSW to WNW at 10 - 18 mph during the afternoon.

SATURDAY
Mixing height below 1000 ft early rising to 2000 - 3000 ft by late morning rising to 4000 - 5000 ft during the afternoon.  Transport wind NNE to NE at 15 - 25 mph.  Surface wind N to NE at 9 - 15 mph.

3.  BURNING INSTRUCTIONS FOR ZONES 624 AND 625 INCLUDING THE WALKER
    RANGE PORTION OF ZONE 624
This instruction is valid for burning conducted on Wednesday, December 2, 2009.
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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.

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4.  SPECIAL NOTE:

    The smoke management forecaster is available at (503)
    945-7401.  The smoke management forecaster is available
    to discuss specific burns.  The duty forecaster phone
    number is (503) 945-7401. Please call this number and
    not individual's numbers to discuss daily burning. Please
    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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