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, May 18, 2009       2:40 PM      Jim Little

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

The upper ridge that provided several days of sunny and warm weather to the Pacific Northwest will have moved to the northern plains states by Tuesday and an upper level low will be moving into British Columbia.  A broad upper level trough will cover Oregon and Washington.  This will produce showers in portions of the state, but south-central Oregon may escape any significant rain.  Cooler air aloft will give high mixing heights and good to excellent smoke dispersal conditions.

    OUTLOOK (WEDNESDAY - FRIDAY):

Temporary weak ridging will return to the region Wednesday to begin a period of generally dry weather.  Afternoon mountain showers are a possibility.  Mixing should remain high for favorable smoke dispersal conditions.  By Thursday a thermal trough will develop and move into southwestern Oregon.  This will give northeasterly transport winds to the region.  West to east flow aloft continues Friday, gradients will be light and minor disturbances aloft could touch off showers over mountainous areas.

2.  DISPERSION

TUESDAY

Transport wind WSW to W at 12 - 24 mph.

Surface wind SSE to SSW at 5 - 9 mph during the morning.  Surface wind shifts to SW to WSW and increases to 10 - 22 mph during the afternoon and evening.


OUTLOOK:

WEDNESDAY
Mixing height below 1000 ft early rising to 2000 - 3000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind NE to E at 9 - 15 mph.  Surface wind SSW to SW at 9 - 15 mph during the morning becoming W to WNW at 12 - 24 mph during the afternoon.

THURSDAY
Mixing height below 1000 ft early rising to 4500 - 5000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.

FRIDAY
Mixing height below 1000 ft early rising to 4500 - 5000 ft by late morning rising above 5000 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, May 19, 2009.
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Avoid ignitions within 10 miles to the WSW through NNW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 15 miles in all directions of SSRAs.  Care needed in selecting units as smoke will likely fumigate along the ground in wind prone areas.

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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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