SMI Northeast (Smoke Management Instructions) Northeast Oregon Smoke Management Instructions

ODF Smoke Management Instructions smi_northeast at listsmart.osl.state.or.us
Sun May 17 14:13:13 PDT 2009


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

ISSUED: Sunday, May 17, 2009       2:40 PM      Jim Little

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

The upper ridge over the Pacific Northwest that brought sunshine and warm weather to the region over the weekend will slowly move east.  A trough in the Gulf of Alaska will strengthen and move toward Washington during the day.  Temperatures should be slightly cooler Monday.  Mixing heights will remain high for excellent smoke dispersal conditions.  Transport winds will be southerly becoming southwesterly.

    OUTLOOK (TUESDAY - THURSDAY):

The trough in the Gulf of Alaska becomes an upper level low by Tuesday and tracks across southern British Columbia.  Showers will develop and there is a slight chance of a thunderstorm developing over mountainous areas.  Transport winds will be southwesterly becoming westerly.  Tuesday mixing heights should provide for excellent smoke dispersal conditions during the afternoon. By Wednesday the upper trough tracks east and weak high pressure develops aloft. Transport winds will be light but favor northeasterly through northwesterly.  A very weak upper trough develops that could touch off some mountain showers Thursday evening.  Thursday transport winds will be west through northwesterly.

2.  DISPERSION

MONDAY
Mixing height 2600 - 3600 ft during the morning.  Mixing height rises to above 5000 ft during the afternoon then lowers to 1500 - 2500 ft during the evening.

Transport wind SSW to SW at 10 - 16 mph during the morning.  Transport wind increases to SW to WSW at 18 - 32 mph during the afternoon then decreases to WSW to WNW at 12 - 22 mph during the evening.

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:

TUESDAY
Mixing height below 1000 ft early rising to 3000 - 4000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind WSW to W at 12 - 24 mph.  Surface wind SSW to SW at 9 - 15 mph during the morning becoming W to WNW at 12 - 24 mph during the afternoon.

WEDNESDAY
Mixing height 3000 - 4000 ft during the morning rising above 5000 ft during the afternoon.  Transport wind NNW to NNE at 6 - 10 mph.  Surface wind NNW to NNE at 4 - 8 mph.

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 during the morning becoming WNW to NNW at 4 - 8 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 Monday, May 18, 2009.
==================================================================

Avoid ignitions within 12 miles to the SSW through WNW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 20 miles to the SSW through WNW in or near drainages leading to SSRAs.  Care needed in selecting units as smoke will likely fumigate along the ground in wind prone areas.

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