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

ODF Smoke Management Instructions smi_northeast at listsmart.osl.state.or.us
Wed Dec 23 14:48:05 PST 2009


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

NOTE:  Fall season smoke management forecasts and instructions will end for 2009 with this bulletin.  A forecaster will remain available weekdays for consultation throughout the winter.  Regular, daily forecasts will begin again in the spring when burning activity increases.

ISSUED: Wednesday, December 23, 2009       2:35 PM      Jim Little

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

   **  Dry and Stable Period Tomorrow and Friday**
    ** Unfavorable  Smoke Dispersal Conditions **


Pacific Northwest Weather will be dominated by an upper ridge through the end of the week.  On Thursday the axis of that ridge will be right along the Oregon/Washington Coast.  Subsiding air with the ridge will make for very stable atmospheric conditions.  At the surface higher pressure over eastern Washington and northern Idaho will give very light southeasterly winds to the region.  Mixing heights will be very low for poor to extremely poor smoke dispersal conditions.

    OUTLOOK (FRIDAY-SUNDAY)

The upper ridge continues to move eastward Friday but little change is expected with respect to smoke dispersal conditions.  Computer models are inconsistent on how the pattern will break down but there is an increasing chance of precipitation by Sunday as weak disturbances move in from the west.  This should help to improve smoke dispersal conditions.

2.  DISPERSION

THURSDAY
Mixing height below 1000 ft throughout the day.

Transport wind light and variable and controlled by local terrain.

Surface wind light and variable and controlled by local terrain.

OUTLOOK:

FRIDAY
Mixing height below 1000 ft throughout the day.  Transport wind light and variable during the morning becoming SE to SSW at 6 - 10 mph during the afternoon.  Surface wind light and variable.

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

SUNDAY
Mixing height below 1000 ft early rising to 1000 to 2000 ft by late morning and through 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 24, 2009.
    ==================================================================

Unfavorable burning situation due to very poor smoke dispersion.  Delay ignitions until 11:00am.  Avoid ignitions within 20 miles in all directions of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 35 miles in all directions of SSRAs.  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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