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

Tue Oct 27 14:31:23 PDT 2009

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

ISSUED: Tuesday, October 27, 2009       2:35 PM      Jim Little

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

The Pacific Northwest will be on the eastern edge of a broad upper level ridge in the eastern Pacific on Wednesday.  Surface high pressure covers the region for dry weather.  Expect good mixing heights but light transport winds.

    OUTLOOK (THURSDAY-SATURDAY)

The upper ridge gets suppressed southward Thursday as a strong upper jet develops in the eastern Pacific and into central British Columbia.  The surface high gets pushed southward and some light rain moves into the region.  Mixing heights remain high, though, and increased transport winds should improve smoke dispersal conditions.  Friday temporary upper ridging will help produce dry weather.  Favorable mixing heights should make for good smoke dispersal conditions.  Some rain is possible in the north on Saturday but smoke dispersal conditions should remain favorable.

2.  DISPERSION

WEDNESDAY
Mixing height 2000 - 3000 ft during the morning.  Mixing height rises above 5000 ft during the afternoon then lowers below 1000 ft during the evening.

Transport wind NW to N at 8 - 12 mph.

Surface wind NW to N at 6 - 12 mph during the morning and afternoon.  Surface wind becomes light and variable and controlled by local terrain during the evening.

OUTLOOK:

THURSDAY
Mixing height below 1000 ft early rising to 1600 to 2600 ft by late morning rising above 5000 ft during the afternoon.  In the west transport wind SSW to SW at 8 - 12 mph.  In the east transport wind light and variable during the morning becoming SSW to SW at 8 - 14 mph during the afternoon.  Surface wind light and variable during the morning becoming SSW to WSW at 6 - 10 mph during the afternoon.

FRIDAY
Mixing height 1200 to 2200 ft during the morning rising to 3500 to 4500 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.

SATURDAY
Mixing height below 1000 ft during the morning rising to 3600 to 4600 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 Wednesday, October 28, 2009.
    ==================================================================

Avoid ignitions within 15 miles to the NW through NNE of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 30 miles in all directions of SSRAs.  Recommend against burning units that will smolder significantly overnight.  Complete ignitions by 4:00pm.

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