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: Thursday, April 2, 2009       2:35 PM      Nick Yonker

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

Upper level trough moves through the region tonight and tomorrow keeping cool, northwesterly flow over the region.  Trough will move by to the east Friday afternoon as an upper ridge approaches from off the coast.  Air mass slowly dries out but remains unstable.  Expect mostly cloudy skies with a chance of a few light showers.  Snow level will range from 2500 - 4000 ft.  Good mixing and moderate NW'erly flow will make for excellent smoke dispersion.

    OUTLOOK (SATURDAY - MONDAY):

A period of spring like weather finally makes an appearance over the weekend and into early next week as an upper level ridge moves in on Saturday and Sunday.  The next frontal system dives mainly to the south of the state later Sunday and Monday.  It appears the region will stay dry through the period with moisture staying to the south in California.  Air mass will stabilize, especially during the night and morning, then destabilize during the afternoon.  Wind flow weakens and turns offshore.  Smoke dispersion slowly worsens.

2.  DISPERSION

FRIDAY
Mixing height above 5000 ft throughout the day.

Transport wind WNW to NW at 11 - 22 mph.

Surface wind NW to NNW at 8 - 14 mph during the morning and afternoon.  Surface wind decreases to NW to NNW at 7 - 11 mph during the evening.

OUTLOOK:

SATURDAY
Mixing height 3200 to 4200 ft during the morning rising to 4400 to 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming E to SSE at 6 - 10 mph during the afternoon.  Surface wind light and variable.

SUNDAY
Mixing height below 1000 ft early rising to 3500 to 4500 ft by late morning rising to 4500 to 5000 ft during the afternoon.  Transport wind SE to SSE at 12 - 22 mph during the morning becoming E to SE at 10 - 16 mph during the afternoon.  Surface wind ESE to SSE at 8 - 12 mph.

MONDAY
Mixing height below 1000 ft early rising to 2500 to 3500 ft by late morning rising to 3500 to 4500 ft during the afternoon.  Transport wind E to SE at 10 - 16 mph.  Surface wind E to SE at 5 - 9 mph during the morning becoming light and variable during the afternoon.

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, April 3, 2009.
    ==================================================================

Avoid ignitions within 10 miles to the WNW through NNW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 10 miles to the WNW through NNE in or near drainages leading to SSRAs.  No additional restrictions necessary.

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