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: Thursday, May 21, 2009       2:40 PM      Jim Trost

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

Sunny and warm weather on tap for the area.  Upper level flow generally westerly.  Although a weak short-wave trough slides into the Pacific Northwest Friday afternoon, it will have little impact on the area.  Low level winds light west northwest to north.  In general good smoke dispersion during the day.  Rapid stabilization of the air mass after sunset and light surface wind will necessitate avoiding smoldering units near SSRAs.

    OUTLOOK (SATURDAY - MONDAY):

Over the next few days, the upper ridge will gradual strengthen and will continue the pleasant weather.  The downside of this is that mixing height gradually lowers as the air mass becomes more stable.  Daytime heating will yield good afternoon mixing but mixing height plummets after sunset.  Smoldering units will need to be avoided near SSRAs.   May need to gradually back off on burning as the air mass continues to stabilize into the holiday weekend.

2.  DISPERSION

FRIDAY
Mixing height 2500 - 3500 ft during the morning, above 5000 ft during the afternoon.  Mixing height lowers to 1000 - 1900 ft during the evening and below 1000 ft overnight.

Transport wind light and variable in the morning.  Transport wind WSW to WNW at 8 - 12 mph during the afternoon then shifts to NW to NNW at 10 - 22 mph during the evening.

Surface wind light and variable, controlled by local terrain, during the morning.  Surface wind WNW to NW at 8 - 12 mph during the afternoon and evening.

OUTLOOK:

SATURDAY
Mixing height below 1000 ft early, 2400 - 3400 ft by late morning, and 4300 - 5000 ft during the afternoon.  Transport wind light and variable during the morning, becoming WNW to NW at 9 - 15 mph during the afternoon.  Surface wind light and variable, becoming WNW to NW at 9 - 15 mph in the afternoon.

SUNDAY
Mixing height below 1000 ft early, rising to 3000 - 4000 ft by late morning, and 4100 - 5000 ft during the afternoon.  Transport wind NNW to NNE at 5 - 9 mph.  Surface wind light and variable, becoming WNW to NNW at 4 - 8 mph during the afternoon.

MONDAY (Memorial Day)
Mixing height below 1000 ft early, 3100 - 4100 ft by late morning, and 4000 - 5000 ft in the afternoon.  Transport wind N to NE at 5 - 9 mph in the morning, becoming NW to N at 8 - 12 mph during the afternoon.  Surface wind N to NE at 4 - 8 mph during the morning and WNW to NNW at 5 - 9 mph during the afternoon.

3.  BURNING INSTRUCTIONS FOR ZONES 624 AND 625 INCLUDING THE WALKER
    RANGE PORTION OF ZONE 624
This instruction is valid for burning conducted on Friday, May 22, 2009.
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Avoid ignitions within 15 miles to the WSW through N of SSRAs.  For units that will smolder into the night, avoid burning within at least 30 miles to the WSW through NE in or near drainages leading to SSRAs.  Recommend against burning units that will smolder significantly overnight.  Complete ignitions by 4 PM.

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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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