SMI Northeast (Smoke Management Instructions) Northeast Oregon Smoke Management Instructions

ODF Smoke Management Instructions smi_northeast at listsmart.osl.state.or.us
Wed Dec 9 14:59:18 PST 2009


SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS
SALEM FORESTRY WEATHER CENTER
OREGON DEPARTMENT OF FORESTRY

ISSUED: Wednesday, December 9, 2009       2:35 PM      Jim Little

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

The coldest air of the current arctic outbreak will slowly shift east.  But not before the entire Pacific Northwest experiences another bone-chilling night.  Daytime temperatures on Thursday will likely be a few degrees warmer than on Wednesday.  Low mixing heights will continue but transport winds will be solidly from the south.

    OUTLOOK (FRIDAY-SUNDAY)

Upper flow goes westerly over the area on Friday.  A weak weather system will spread generally light precipitation into southwest Oregon and that precipitation will move slowly into the region during the afternoon.  Mixing heights will improve some and the southerly transport winds will continue.  By Saturday expect light snow, slowly improving mixing heights, and a continued southerly transport wind.  Sunday will see scattered showers and mixing heights near 5000 feet for good smoke dispersal conditions.

2.  DISPERSION

THURSDAY

Zone 630 and 632:
Mixing height below 1000 ft during the morning.  Afternoon mixing height rising to 1800 - 2800 ft then lowering below 1000 ft during the evening.

Transport wind SSW to SW at 8 - 12 mph.

Surface wind SSE to SW at 6 - 10 mph during the morning.  Surface wind becomes light and variable and controlled by local terrain during the afternoon then increases to S to SW at 6 - 10 mph during the evening.

Zone 633 - 638:
Mixing height below 1000 ft during the morning.  Afternoon mixing height rising to 1800 - 2800 ft then lowering below 1000 ft during the evening.

Transport wind SSW to WSW at 5 - 9 mph during the morning.  Transport wind becomes light and variable and controlled by local terrain during the afternoon then increases to S to SW at 6 - 10 mph during the evening.

Surface wind light and variable and controlled by local terrain.  Surface wind increases to SE to S at 5 - 9 mph during the evening.

OUTLOOK:

FRIDAY
Mixing height below 1000 ft during the morning rising to 2000 to 3000 ft during the afternoon.  Transport wind S to SW at 9 - 15 mph.  Surface wind SSE to SSW at 6 - 10 mph.

SATURDAY
Mixing height below 1000 ft early rising to 1000 to 2000 ft by late morning rising to 2100 to 3100 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.

SUNDAY
Mixing height below 1000 ft early rising to 2000 to 3000 ft by late morning rising to 4500 to 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, December 10, 2009.
    ==================================================================

Zone 630 and 632:
Unfavorable burning situation due to very poor smoke dispersion.  Delay ignitions until 11:00am.  Avoid ignitions within 20 miles to the S through WSW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 35 miles to the S through WSW in or near drainages leading to SSRAs.  Recommend against burning units that will smolder significantly overnight.  Complete ignitions by 4:00pm.

Zone 633 - 638:
Unfavorable burning situation due to very poor smoke dispersion.  Delay ignitions until 11:00am.  Avoid ignitions within 20 miles to the S through WSW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 35 miles to the S through WSW in or near drainages leading to SSRAs.  Verify transport winds away from SSRAs if burning in any other direction.  Recommend against burning units that will smolder significantly overnight.  Complete ignitions by 3:00pm.

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