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: Monday, May 10, 2010       2:35 PM      Jim Little

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

  TUESDAY

The upper level low that swung into Northern California on Monday moves across Nevada and Utah while an upper level ridge builds off the coast. A chance of mainly mountain showers continues, but the chances will decrease during the day.  Maximum mixing heights should remain high enough for good smoke dispersal conditions.

    OUTLOOK (WEDNESDAY-FRIDAY)

The offshore upper ridge moves over western Oregon Wednesday.  This will give northerly upper level flow to the region with dry weather.  Maximum mixing heights remain above 5000 feet during the afternoon for good smoke dispersal conditions.  Fair skies will allow for the formation of nighttime inversions which will hold smoke from any smoldering units close to the ground during the overnight hours.  By Thursday the upper ridge becomes indistinct.  Winds aloft go light and variable, and lower level transport winds will be quite light as well.  The nighttime inversions continue.  Not much change is expected from Thursday to Friday.


2.  DISPERSION

TUESDAY

Zone 630 and 632:
Mixing height 1600 - 2600 ft during the morning.  Mixing height rises to above 5000 ft during the afternoon then lowers to 3600 - 4600 ft during the evening.

Transport wind NW to N at 14 - 28 mph.

Surface wind NW to N at 10 - 22 mph during the morning and afternoon.  Surface wind decreases to NNW to N at 10 - 16 mph during the evening.

Zone 633 - 638:
Mixing height 2000 - 3000 ft during the morning.  Mixing height rises to above 5000 ft during the afternoon then lowers to 3300 - 4300 ft during the evening.

Transport wind NW to N at 10 - 18 mph throughout the day.

Surface wind NW to N at 9 - 15 mph during the morning and afternoon.  Surface wind decreases to NNW to NNE at 6 - 10 mph during the evening.

OUTLOOK:

WEDNESDAY
In the west mixing height below 1000 ft early rising to 3300 to 4300 ft by late morning rising above 5000 ft during the afternoon.  In the east mixing height 2800 to 3800 ft during the morning rising above 5000 ft during the afternoon.  Transport wind NW to NNE at 6 - 10 mph.  Surface wind WNW to NNW at 5 - 7 mph during the morning becoming NNW to NNE at 8 - 14 mph during the afternoon.

THURSDAY
Mixing height below 1000 ft early rising above 5000 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 above 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 Tuesday, May 11, 2010.
    ==================================================================

Zone 630 and 632:
Avoid ignitions within 10 miles to the NW through N of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 15 miles to the NW through N in or near drainages leading to SSRAs.  Care needed in selecting units as smoke will likely fumigate along the ground in wind prone areas.

Zone 633 - 638:
Avoid ignitions within 12 miles to the NW through NNE of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 20 miles to the NW through NNE in or near drainages leading to SSRAs.

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