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: Tuesday, April 21, 2009       2:35 PM      Jim Little

1.  DISCUSSION AND FORECAST FOR NORTHEAST FORECAST AREA ZONES 630-638
An upper level trough extending southwestward from a low in northern Alberta begins to move into the northwest Washington during the day on Wednesday.  Temperatures aloft will be cooling dramatically, destabilizing the atmosphere and providing good smoke dispersal conditions.  There will be limited moisture with this trough but some isolated showers are possible.  Expect transport winds to be generally west to northwest most areas.

    OUTLOOK (THURSDAY - SATURDAY):

The upper level trough sweeps through the region on Thursday further destabilizing the atmosphere over the Pacific Northwest.  Again, limited moisture, but showers are possible especially over mountainous areas.  The trough remains over the region on Friday for a continued chance of scattered showers but also good smoke dispersal conditions with high mixing heights.  Saturday will see the upper trough well to the east, over the northern Rockies with surface high pressure centered several hundred miles west of Oregon.  A minor upper disturbance dropping south-southeast will cause some instability for a continued slight chance of a shower but also continued good smoke dispersal conditions.  Transport winds through the outlook period should stay in the west through north quadrant.

2.  DISPERSION

WEDNESDAY

Zone 630 and 632:
Mixing height above 5000 ft throughout the day.

Transport wind WSW to WNW at 8 - 14 mph during the morning.  Transport wind increases to W to WNW at 18 - 30 mph during the afternoon then decreases to WNW to NW at 15 - 25 mph during the evening.

Surface wind WNW to NNW at 8 - 12 mph during the morning.  Surface wind increases to NW to NNW at 18 - 30 mph during the afternoon then decreases to NW to NNW at 10 - 18 mph during the evening.

Zone 633 - 638:
Mixing height 3500 - 4500 ft during the morning.  Mixing height rises above 5000 ft during the afternoon and evening.

Transport wind W to NNW at 6 - 10 mph during the morning.  Transport wind increases to WSW to WNW at 15 - 25 mph during the afternoon then shifts to NW to NNW at 15 - 29 mph during the evening.

Surface wind NW to N at 6 - 10 mph during the morning.  Surface wind increases to NW to NNW at 14 - 28 mph during the afternoon and evening.

OUTLOOK:

THURSDAY
Mixing height 4200 to 5000 ft during the morning rising above 5000 ft during the afternoon.  Transport wind NW to NNW at 10 - 16 mph.  Surface wind WNW to NNW at 8 - 14 mph during the morning becoming NW to NNW at 10 - 22 mph during the afternoon.

FRIDAY
Mixing height 4500 to 5000 ft during the morning rising above 5000 ft during the afternoon.  Transport wind NW to N at 10 - 22 mph during the morning becoming NW to N at 14 - 28 mph during the afternoon.  Surface wind NW to N at 10 - 22 mph.

SATURDAY
Mixing height 2800 to 3800 ft during the 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 Wednesday, April 22, 2009.
    ==================================================================

Zone 630 and 632:
Avoid ignitions within 10 miles to the WSW through NW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 10 miles to the WSW through NNW in or near drainages leading to SSRAs.  Care needed in selecting units as smoke will likely fumigate along the ground in wind prone areas.  No additional restrictions necessary.

Zone 633 - 638:
Avoid ignitions within 10 miles to the WSW through NNW of SSRAs.  Care needed in selecting units as smoke will likely fumigate along the ground in wind prone areas.  Watch for shifting transport winds.  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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