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

[ODF Smoke Management Instructions]

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

ISSUED: Saturday, May 23, 2009       2:40 PM      Jim Trost

The weather/smoke management office will be closed Sunday for the Memorial Day holiday.  A forecaster will be available Monday to prepare an instruction for Tuesday and to assist in planning for Tuesday's burning.  Recommend against burning on Sunday and Monday.


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

West to southwest flow aloft over the Pacific Northwest brings warm dry weather to Oregon.  Afternoon heating creates enough instability that there will be a slight chance of thunderstorms.  Light north to northeast transport continues.  Surface winds light and variable much of the day, so terrain a major factor in smoke movement.  Poor night and morning dispersion but heating brings generally good dispersion in the afternoon.

    OUTLOOK (MONDAY - WEDNESDAY)

Not a lot of change through mid-week.  The upper level ridge tends to strengthen, thus limiting mixing. Transport flow mostly northerly through the period with considerable variability under the subsiding air aloft.  Generally light surface wind complicates keeping smoke out of sensitive areas.  Poor dispersion in the mornings but heating will provide good dispersion during the afternoons.

2.  DISPERSION

SUNDAY
Mixing height 2000 - 3000 ft during the morning, 3800 - 4800 ft in the afternoon and 1500 - 2500 ft during the evening.  Mixing height falls below 1000 ft after sunset.

Transport wind N to NE at 5 - 9 mph in the morning, and NNW to NNE at 8 - 14 mph during the afternoon and evening.

Surface wind light and variable, becoming WNW to NNW at 8 - 12 mph during the afternoon and evening.

OUTLOOK:

MONDAY
Mixing height below 1000 ft early, 2400 - 3400 ft by late morning, and 3900 - 4900 ft in the afternoon.  Transport wind NE to E at 4 - 8 mph during the morning and WNW to NNW at 5 - 9 mph during the afternoon.  Surface wind light and variable, becoming WNW to NNW at 6 - 10 mph during the afternoon.

TUESDAY
Mixing height below 1000 ft early, 2700 - 3700 ft by late morning, and 3900 - 4900 ft during the afternoon.  Transport wind light and variable during the morning, becoming W to NW at 4 - 8 mph during the afternoon.  Surface wind light and variable, becoming WNW to NNW at 6 - 10 mph during the afternoon.

WEDNESDAY
Mixing height below 1000 ft early, rising to 2500 - 3500 ft by late morning, and 4000 - 5000 ft during the afternoon.  Transport wind ENE to ESE at 4 - 8 mph during the morning, becoming WNW to NNW at 5 - 9 mph during the afternoon.  Surface wind light and variable.

3.  BURNING INSTRUCTIONS FOR ZONES 624 AND 625 INCLUDING THE WALKER
    RANGE PORTION OF ZONE 624
This instruction is valid for burning conducted on Sunday, May 24, 2009.
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Recommend against burning over the Memorial Day holiday.  At the minimum, avoid ignitions within 18 miles to the NW through NE of SSRAs and recreation areas.  For units that will smolder into the night, avoid burning within at least 35 miles to the NW through ENE in or near drainages leading to SSRAs.  Verify transport winds away from SSRAs if burning in any other direction.  Recommend against burning units that will smolder overnight.

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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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