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: Wednesday, May 20, 2009       2:35 PM      Jim Little

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

Thursday will see a generally west-to-east flow aloft with minor ridging.  The air mass continues its warm up and surface temperatures should be 6-10F warmer than on Wednesday.  Dry weather will prevail through the holiday weekend.  Mixing heights will be high enough to result in good to excellent smoke dispersal conditions.  Expect a generally northerly transport wind.

    OUTLOOK (FRIDAY - SUNDAY)

A weak but dry disturbance will pass over the area Friday night and Saturday with only mid and high level clouds.  A ridge of high pressure will slowly build into the area later in the weekend and into next week.  That will ensure continued dry weather with above average temperatures.  Mixing heights should stay favorable for good smoke dispersal conditions afternoons, but nighttime inversions will trap residual smoke near the ground.  Transport winds will be generally northerly.

2.  DISPERSION

THURSDAY

Zone 630 and 632:
Mixing height 2500 - 3500 ft during the morning.  Afternoon mixing height rises to 4300 - 5000 ft then lowers below 1000 ft during the evening.

Transport wind light and variable and controlled by local terrain during the morning.  Transport wind increases to NNW to NNE at 6 - 10 mph during the afternoon and increases to NNE to NE at 12 - 22 mph during the evening.

Surface wind light and variable and controlled by local terrain during the morning.  Surface wind increases to NW to NNE at 4 - 8 mph during the afternoon and increases to NNE to NE at 10 - 18 mph during the evening.

Zone 633 - 638:
Mixing height 2900 - 3900 ft during the morning.  Mixing height rises above 5000 ft during the afternoon then lowers below 1000 ft during the evening.

Transport wind light and variable and controlled by local terrain.  Transport wind increases to NNW to NNE at 10 - 16 mph during the evening.

Surface wind light and variable and controlled by local terrain during the morning.  Surface wind increases to NNW to NNE at 4 - 8 mph during the afternoon and evening.

OUTLOOK:

FRIDAY
Mixing height below 1000 ft early rising to 2400 to 3400 ft by late morning rising to 3800 to 4800 ft during the afternoon.  Transport wind light and variable during the morning becoming NNW to N at 10 - 22 mph during the afternoon.  Surface wind light and variable during the morning becoming NW to N at 8 - 14 mph during the afternoon.

SATURDAY
Mixing height 2800 to 3800 ft during the morning rising to 4500 to 5000 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.

SUNDAY
Mixing height below 1000 ft early rising to 4500 to 5000 ft by late morning and through 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 Thursday, May 21, 2009.
    ==================================================================

Zone 630 and 632:
Avoid ignitions within 15 miles to the NW through SE of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 30 miles to the NW through SE in or near drainages leading to SSRAs.  Recommend against burning units that will smolder significantly overnight.  Complete ignitions by 4pm

Zone 633 - 638:
Avoid ignitions within 15 miles in all directions 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.  Care needed in selecting units as smoke will likely flow down drainages and into low-lying areas overnight.  Complete ignitions by 4pm

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