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, April 21, 2010       2:35 PM      Jim Little

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

An upper level low pressure area, centered over southern Nevada, is maintaining a very cool air mass over Oregon and continuing to circulate enough moisture over the region for widely scattered showers.  Another spoke of energy is forecast to rotate around the trough and over eastern Oregon tonight and early Thursday, with increasing rain and snow showers.  Snow levels should be around 5-6000 early Thursday and rise to near 7000 feet Thursday afternoon.  Transport winds will become northwesterly with 4-5000 foot mixing heights. Showers should end by Thursday evening, as the flow aloft dries out and turns more northerly

    OUTLOOK (FRIDAY-SUNDAY)

A weak weather system will push into southern British Columbia on Friday, with transport winds turning west-northwesterly by late in the day.  After a cold morning, with very poor mixing, ventilation will improve significantly with the daytime heating Friday afternoon.  An upper level trough is forecast to slide across eastern Washington and northern Idaho Saturday and early Sunday, with the flow aloft turning westerly. This system will bring back a chance of showers to mainly the northern.  A weak upper-level ridge is forecast to move over western Oregon Sunday afternoon with a dry northwesterly flow aloft.  Morning inversions will give way to good afternoon ventilation conditions.


2.  DISPERSION

THURSDAY

Zone 630 and 632:
Mixing height 1800 - 2800 ft during the morning.  Afternoon mixing height rises to 4000 - 5000 ft then lowers to 2600 - 3600 ft during the evening.

Transport wind NNW to N at 12 - 22 mph during the morning.  Transport wind increases to NNW to N at 15 - 29 mph during the afternoon and evening.

Surface wind NW to N at 10 - 20 mph during the morning and afternoon.  Surface wind decreases to NW to N at 8 - 14 mph during the evening.

Zone 633 - 638:
Mixing height 2500 - 3500 ft during the morning.  Afternoon mixing height rises to 3500 - 4500 ft then lowers to 1600 - 2600 ft during the evening.

Transport wind NNW to N at 12 - 24 mph throughout the day.

Surface wind NNW to N at 10 - 22 mph during the morning and afternoon.  Surface wind decreases to NW to N at 8 - 14 mph during the evening.

OUTLOOK:

FRIDAY
Mixing height below 1000 ft early rising to 3000 to 4000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind NW to N at 4 - 8 mph during the morning becoming W to NW at 8 - 14 mph during the afternoon.  Surface wind light and variable during the morning becoming W to NW at 8 - 12 mph during the afternoon.

SATURDAY
Mixing height below 1000 ft early rising to 2500 to 3500 ft by late morning rising above 5000 ft during the afternoon.  Transport wind W to NW at 4 - 8 mph.  Surface wind W to NW at 4 - 8 mph.

SUNDAY
Mixing height below 1000 ft early rising to 3000 to 4000 ft by late morning rising above 5000 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 Thursday, April 22, 2010.
    ==================================================================

Zone 630 and 632:
Avoid ignitions within 12 miles to the NNW through N of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 20 miles to the NNW 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.  Care needed in selecting units as smoke will likely fumigate along the ground in wind prone areas.

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