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, May 19, 2009       2:35 PM      Jim Little

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

The upper level trough that brought rain to many parts of Oregon shifts to the east on Wednesday.  Weak ridging aloft moves in to cut off any remaining showers overnight and give dry weather during the day.  Mixing heights should climb to above 5000 feet during the day for excellent smoke-dispersal conditions.  Night-time inversions will trap residual smoke in valleys and swales overnight.  Transport winds will be generally southwest through northwest.

    OUTLOOK (THURSDAY-SATURDAY):

Weak ridging aloft continues Thursday for dry weather.  Temperatures climb to above normal levels.  Afternoon mixing heights remain high for good to excellent smoke dispersal conditions.  Transport winds will be mostly north or northeasterly.  Friday and Saturday a generally west-to-east flow in the upper atmosphere will prevail, but with minor impulses rippling past in the flow.  These could touch off afternoon or evening thunderstorms mainly over mountainous regions.  Smoke dispersal conditions remain good and winds will be generally northerly.

2.  DISPERSION

WEDNESDAY

Zone 630 and 632:
Mixing height 2800 - 3800 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 N to NE at 9 - 15 mph during the evening.

Surface wind light and variable and controlled by local terrain.  Surface wind increases to N to NE at 8 - 12 mph during the evening.

Zone 633 - 638:
Mixing height 3700 - 4700 ft during the morning.  Mixing height rises to above 5000 ft during the afternoon then lowers to 1400 - 2400 ft during the evening.

Transport wind light and variable and controlled by local terrain during the morning.  Transport wind increases to NW to NNE at 4 - 8 mph during the afternoon and increases to NNW to NNE at 8 - 12 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:

THURSDAY
Mixing height below 1000 ft early rising to 2900 to 3900 ft by late morning rising to 4100 to 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming NNW to NNE at 5 - 9 mph during the afternoon.  Surface wind light and variable during the morning becoming NW to N at 8 - 12 mph during the afternoon.

FRIDAY
Mixing height below 1000 ft early rising to 3500 to 4500 ft by late morning rising to 4500 to 5000 ft during the afternoon.  Transport wind NW to NNE at 4 - 8 mph.  Surface wind NW to NNE at 5 - 9 mph.

SATURDAY
Mixing height 2800 to 3800 ft during the morning rising to 4500 to 5000 ft during the afternoon.  Transport wind NW to N at 10 - 16 mph.  Surface wind NW to N at 10 - 18 mph.

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, May 20, 2009.
    ==================================================================

Zone 630 and 632:
Avoid ignitions within 15 miles to the NNW through ESE of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 30 miles to the NNW 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 12 miles to the WNW through NNE of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 20 miles in all directions of SSRAs.  Verify transport winds away from SSRAs if burning in any other direction.  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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