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

[ODF Smoke Management Instructions]

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

ISSUED: Monday, October 26, 2009       2:40 PM      Jim Little

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

The wet Pacific cold front that brought a little rain to the region Monday will be well to the east and dissipating.  The cool upper trough supporting that system will move to the northern Rockies leaving a cool northerly flow aloft over Oregon.  This will keep the atmosphere destabilized with mixing heights above 5000 feet most areas.  Winds will remain brisk for favorable smoke dispersal conditions most areas.  Expect scattered showers during the day, gradually dissipating by late afternoon.

    OUTLOOK (WEDNESDAY-FRIDAY)

An upper level ridge builds in the eastern Pacific and moves over the region on Wednesday.  Weather will be dry, however the ridge will progress to the east and allow another Pacific warm front to approach the coast Wednesday evening.  This may produce some light rain in the region by Thursday.   Friday will see showers with another Pacific front due in on Saturday.  Mixing heights should remain fairly high for good smoke dispersal conditions through the outlook period.


2.  DISPERSION

TUESDAY
Mixing height above 5000 ft throughout the day.

Transport wind NW to N at 18 - 30 mph.

Surface wind NW to N at 12 - 24 mph.

OUTLOOK:

WEDNESDAY
Mixing height 2700 - 3700 ft during the morning rising above 5000 ft during the afternoon.  Transport wind NNW to NNE at 16 - 30 mph during the morning becoming N to NNE at 10 - 22 mph during the afternoon.  Surface wind NNW to NNE at 10 - 22 mph.

THURSDAY
Mixing height below 1000 ft early rising to 1000 - 2000 ft by late morning rising to 3500 - 4500 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.

FRIDAY
Mixing height 2200 - 3200 ft during the morning rising to 3500 - 4500 ft during the afternoon.  Transport wind light and variable.  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 Tuesday, October 27, 2009.
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Avoid ignitions within 10 miles to the NW through N of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 10 miles to the NW through NNE in or near drainages leading to SSRAs.  Care needed in selecting units as smoke will likely fumigate along the ground in wind prone areas.  No additional restrictions necessary.

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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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