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, November 16, 2009       2:35 PM      Jim Little

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

Wednesday expect scattered showers with slowly decreasing mixing heights as the air mass slightly stabilizes.  Further stabilization will occur on Thursday with generally dry conditions.  Smoke dispersal conditions will be marginal to fair most areas.  Another Pacific cold front will finally move into the region late Friday and this should improve mixing heights as it moves through.

    OUTLOOK (WEDNESDAY-FRIDAY)

The upper level trough moves west to east across the Pacific Northwest during the day.  Subsidence behind the trough starts to stabilize the atmosphere.  Mixing heights will fall and smoke dispersal conditions become less favorable.  By Thursday temporary ridging aloft suppresses mixing heights and smoke dispersal conditions further deteriorate. Mixing heights will be near 3000 feet most areas.  A strong upper trough approaches Friday and cooler air aloft with this system helps destabilize the atmosphere and improve burning prospects.

2.  DISPERSION

TUESDAY

Zone 630 and 632:

Transport wind SSW to SW at 25 - 43 mph during the morning.  Transport wind decreases to SW to W at 8 - 14 mph during the afternoon and evening.

Surface wind SSW to SW at 14 - 28 mph during the morning.  Surface wind shifts to SW to W and decreases to 5 - 9 mph during the afternoon and evening.


Zone 633 - 638:

Transport wind S to SSW at 20 - 34 mph during the morning.  Transport wind decreases to S to SSW at 15 - 25 mph during the afternoon and decreases to S to SW at 8 - 12 mph during the evening.

Surface wind S to SSW at 12 - 24 mph during the morning.  Surface wind decreases to SSE to SSW at 10 - 16 mph during the afternoon then becomes light and variable and controlled by local terrain during the evening.


OUTLOOK:

WEDNESDAY
Mixing height 1300 to 2300 ft during the morning rising to 3500 to 4500 ft during the afternoon.  Transport wind SW to WSW at 8 - 14 mph during the morning becoming S to SW at 10 - 18 mph during the afternoon.  Surface wind SSW to WSW at 6 - 10 mph during the morning becoming S to SW at 6 - 10 mph during the afternoon.

THURSDAY
Mixing height below 1000 ft early rising to 1000 to 2000 ft by late morning rising to 2500 to 3500 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.

FRIDAY
Mixing height 1500 to 2500 ft during the morning rising to 4500 to 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming SE to SSW at 4 - 8 mph during the afternoon.  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, November 17, 2009.
    ==================================================================

Zone 630 and 632:
Avoid ignitions within 12 miles to the SSW through WNW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 20 miles to the SSW through WNW in or near drainages leading to SSRAs.  Care needed in selecting units as smoke will likely fumigate along the ground in wind prone areas.  Complete ignitions by 3:00pm.

Zone 633 - 638:
Avoid ignitions within 10 miles to the SSE through SW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 15 miles to the SSE through W 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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