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, April 20, 2009       2:35 PM      Jim Little

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

 The ridge of high pressure in the upper atmosphere that has brought the sunshine and warm weather to the Pacific Northwest will remain on Tuesday; however it will start to weaken as an upper level low pressure area moves across the northern Gulf of Alaska.  Mixing heights should be favorable for good smoke dispersion, reaching to 5000 feet during the afternoons after morning surface inversions break.   Transport winds will be generally southwest in the morning changing to northwest in the afternoon.

   OUTLOOK (WEDNESDAY - FRIDAY):

The tail end of the Gulf of Alaska low digs south to off the British Columbia coast on Wednesday, but weather will remain dry.  Isolated afternoon thunderstorms are possible over mountainous areas.  On Thursday the upper trough sweeps into the Pacific Northwest.  Moisture will be very limited but isolated showers are likely throughout the region.  The trough will slowly shift eastward through the region Friday.  Mixing heights should be favorable for good smoke dispersal throughout the outlook period.

2.  DISPERSION

TUESDAY

Zone 630 and 632:
Mixing height 2700 - 3700 ft during the morning.  Mixing height rises above 5000 ft during the afternoon then lowers below 1000 ft during the evening.

Transport wind SSW to WSW at 4 - 8 mph during the morning.  Transport wind shifts to W to WNW and increases to 12 - 24 mph during the afternoon then shifts to NW to N at 10 - 22 mph during the evening.

Surface wind light and variable and controlled by local terrain during the morning.  Surface wind increases to NW to N at 9 - 15 mph during the afternoon then decreases to WNW to NNW at 6 - 10 mph during the evening.

Zone 633 - 638:
Mixing height 3100 - 4100 ft during the morning.  Mixing height rises above 5000 ft during the afternoon then lowers below 1000 ft during the evening.

Transport wind SSE to SSW at 8 - 12 mph during the morning.  Transport wind shifts to W to NW at 9 - 15 mph during the afternoon and shifts to NNW to N at 10 - 20 mph during the evening.

Surface wind light and variable and controlled by local terrain during the morning.  Surface wind increases to NNW to NNE at 8 - 12 mph during the afternoon and evening.

OUTLOOK:

WEDNESDAY
Mixing height below 1000 ft early rising to 3900 to 4900 ft by late morning rising above 5000 ft during the afternoon.  Transport wind W to NW at 6 - 10 mph during the morning becoming WNW to NW at 14 - 28 mph during the afternoon.  Surface wind SW to W at 6 - 10 mph during the morning becoming NW to NNW at 16 - 30 mph during the afternoon.

THURSDAY
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 during the morning becoming NNW to N at 12 - 22 mph during the afternoon.  Surface wind light and variable during the morning becoming NNW to N at 12 - 22 mph during the afternoon.

FRIDAY
Mixing height 2800 to 3800 ft during the morning rising above 5000 ft during the afternoon.  Transport wind NW to NNE at 5 - 9 mph.  Surface wind NW to NNE at 5 - 9 mph.

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, April 21, 2009.
    ==================================================================

Zone 630 and 632:
Avoid ignitions within 15 miles to the SSW through N of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 30 miles to the SSW through N in or near drainages leading to SSRAs.  Verify transport winds away from SSRAs if burning in any other direction.  Watch for shifting transport winds.  Recommend against burning units that will smolder significantly overnight.

Zone 633 - 638:
Avoid ignitions within 15 miles in all directions of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 30 miles in all directions of SSRAs.  Watch for shifting transport winds.  Recommend against burning units that will smolder significantly overnight.

    =========================================================
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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