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

ODF Smoke Management Instructions smi_northeast at listsmart.osl.state.or.us
Mon Dec 7 14:16:13 PST 2009


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

ISSUED: Monday, December 7, 2009       2:35 PM      Jim Little

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

Cold weather will continue.  Upper flow over the Pacific Northwest is essentially northerly.  A weak upper trough will drop down on the northerly flow.  Satellite pictures show some clouds with this feature but computer models indicate very limited moisture.  There could be a scattered snow shower or two but I expect no significant accumulation.
Mixing heights will generally be around 2500 feet for marginal smoke dispersal conditions.


    OUTLOOK (WEDNESDAY-FRIDAY)

A dry upper flow continues over the northwest Wednesday, however following the passage of Tuesday's weak upper trough the flow turns a little more north-northwest.  The air mass stabilizes for less favorable smoke dispersal conditions. Northwesterly flow aloft continues in the north on Thursday but westerly flow aloft begins to push into northern California and SW Oregon but in northwest Oregon mixing heights will remain fairly low.  A weak upper disturbance moves over southern Oregon and northern California Friday as the cold weather pattern slowly breaks down and improved smoke dispersal conditions develop.

2.  DISPERSION

TUESDAY

Zone 630 and 632:
Mixing height below 1000 ft during the morning.  Afternoon mixing height rising to 1700 - 2700 ft then lowering below 1000 ft during the evening.

Transport wind light and variable and controlled by local terrain.

Surface wind light and variable and controlled by local terrain.

Zone 633 - 638:
Mixing height 1000 - 1600 ft during the morning.  Afternoon mixing height rises to 1700 - 2700 ft then lowers to 1000 - 1600 ft during the evening.

Transport wind light and variable and controlled by local terrain.

Surface wind light and variable and controlled by local terrain.

OUTLOOK:

WEDNESDAY
Mixing height below 1000 ft early rising to 1400 to 2400 ft by late morning rising to 2000 to 3000 ft during the afternoon.  Transport wind W to NW at 8 - 14 mph during the morning becoming WNW to NNW at 4 - 8 mph during the afternoon.  Surface wind SW to WNW at 4 - 8 mph during the morning becoming light and variable during the afternoon.

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

FRIDAY
Mixing height below 1000 ft early rising to 1500 to 2500 ft by late morning rising to 2500 to 3500 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, December 8, 2009.
    ==================================================================

Zone 630 and 632:
Unfavorable burning situation due to very poor smoke dispersion.  Delay ignitions until 10:00am.  Avoid ignitions within 20 miles in all directions of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 35 miles in all directions of SSRAs.  Recommend against burning units that will smolder significantly overnight.  Complete ignitions by 3:00pm.

Zone 633 - 638:
Unfavorable burning situation due to very poor smoke dispersion.  Delay ignitions until 10:00am.  Avoid ignitions within 20 miles in all directions of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 35 miles in all directions of SSRAs.  Recommend against burning units that will smolder significantly overnight.  Complete ignitions by 3:00pm.

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