SMI Northeast (Smoke Management Instructions) Northeast 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       2:35 PM      Jim Little

1.      DISCUSSION AND FORECAST FOR NORTHEAST FORECAST AREA ZONES 630-638

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 throughout the area.  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

Zone 630 and 632:
Mixing height 3600 - 4600 ft during the morning.  Mixing height rises above 5000 ft during the afternoon and evening.

Transport wind W to NW at 10 - 22 mph during the morning.  Transport wind increases to W to WNW at 14 - 28 mph during the afternoon and evening.

Surface wind light and variable and controlled by local terrain during the morning.  Surface wind increases to NNW to NNE at 4 - 8 mph during the afternoon and evening.

Zone 633 - 638:
Mixing height 3600 - 4600 ft during the morning.  Mixing height rises to above 5000 ft during the afternoon then lowers to 3700 - 4700 ft during the evening.

Transport wind W to NW at 9 - 15 mph during the morning.  Transport wind increases to W to NW at 12 - 24 mph during the afternoon and evening.

Surface wind light and variable and controlled by local terrain during the morning.  Surface wind increases to NNW to NNE at 4 - 8 mph during the afternoon and evening.

OUTLOOK:

WEDNESDAY
Mixing height below 1000 ft early rising to 3000 to 4000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming NNW to NE at 4 - 8 mph during the afternoon.  Surface wind NW to N at 4 - 8 mph during the morning becoming NW to N at 9 - 15 mph during the afternoon.

THURSDAY
Mixing height below 1000 ft early rising to 4000 to 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 to 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 NORTHEAST OREGON ZONES 630-638
    The following considerations should be adhered to in addition to
    the requirements of the Oregon Smoke Management Plan. These
    Instructions are valid for burning conducted on Tuesday, May 19, 2009.
    ==================================================================

Zone 630 and 632:
Avoid ignitions within 10 miles to the W through NW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 15 miles to the W through NW in or near drainages leading to SSRAs.

Zone 633 - 638:
Avoid ignitions within 10 miles to the W through NNW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 15 miles to the W through NNW in or near drainages leading to SSRAs.

    =========================================================
4.  SPECIAL NOTE:

    The smoke management forecaster is available at (503)-
    945-7401. Please call this number and not individual's
    numbers to discuss daily burning.  For large burns (over
    2000 tons) or burns extending over a considerable period,
    please request a special forecast.  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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