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

ODF Smoke Management Instructions smi_northeast at listsmart.osl.state.or.us
Thu May 21 14:25:07 PDT 2009


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

ISSUED: Thursday, May 21, 2009       2:35 PM      Jim Trost

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

Mild weather in store for the area.  Upper level flow generally westerly.  A weak short-wave trough slides over the area Friday afternoon.  Not much associated with this feature other than a few clouds and enough decrease in stability to keep mixing good over northeast Oregon.  Low level winds light northwest to north.  In general good smoke dispersion during the day but mostly clear skies will allow rapid stabilization after sunset and poor nighttime mixing.

    OUTLOOK (SATURDAY - MONDAY):

Over the next few days, a gradual strengthening of the upper ridge will continue the pleasant weather.  Only drawback is that mixing height gradually lowers as the air mass becomes more stable.  Daytime heating will yield good afternoon mixing but mixing height plummets after sunset.  Smoldering units will need to be avoided near SSRAs.   May need to gradually back off on burning as the air mass continues to stabilize into the holiday weekend.

2.  DISPERSION

FRIDAY
Mixing height 2400 - 3400 ft during the morning.  Afternoon mixing height rises to 4500 - 5000 ft or more, then lowers to 2000 - 3000 ft during the evening.  Overnight mixing becomes very poor.

Transport wind NW to N at 5 - 9 mph in the morning, NW to N at 8 - 14 mph during the afternoon and, NNW to N at 11 - 23 mph during the evening.

Surface wind NW to N at 4 - 8 mph during the morning, becoming NW to N at 9 - 15 mph during the afternoon and evening.

OUTLOOK:

SATURDAY
Mixing height below 1000 ft early, rising to 3300 to 4300 ft by late morning, and 4200 to 5000 ft during the afternoon.  Transport wind NNW to NNE at 7 - 11 mph during the morning, becoming NNW to N at 10 - 22 mph during the afternoon.  Surface wind light and variable, becoming NW to N at 10 - 16 mph during the afternoon.

SUNDAY
Mixing height below 1000 ft early, 3000 to 4000 ft by late morning, and 4000 to 5000 ft during the afternoon.  Transport wind NW to NNE at 6 - 10 mph.  Surface wind light and variable, becoming NW to N at 4 - 8 mph during the afternoon.

MONDAY (Memorial Day)
Mixing height below 1000 ft early, rising to 2900 to 3900 ft by late morning, and 3800 to 4800 ft during the afternoon.  Transport wind NW to NNE at 6 - 10 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 Friday, May 22, 2009.
    ==================================================================

Avoid ignitions within 12 miles to the NW through NNE of SSRAs.  For units that will smolder into the night, avoid burning within at least 20 miles to the NW through NNE in or near drainages leading to SSRAs.  Verify transport winds away from SSRAs if burning in any other direction.  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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