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

NOTE:  Fall season smoke management forecasts and instructions will end for 2009 with the forecast issued tomorrow, December 23d.  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: Tuesday, December 22, 2009       2:35 PM      Jim Little

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

  ** Dry and Stable Period Next Few Days **
** Unfavorable  Smoke Dispersal Conditions **

Pacific Northwest Weather will be dominated by an upper ridge through the end of the week.  On Wednesday the axis of this ridge will be about 200 miles west of the coastline and will essentially remain stationary throughout the day.  At the surface highest pressures will be over southern British Columbia.  This will give light northwest winds to most areas.  Mixing heights will remain below 2000 feet for poor smoke dispersal conditions.

    OUTLOOK (THURSDAY-SATURDAY)

The upper ridge continues its slow eastward movement.  On Thursday it is just off the coast and on Friday the ridge axis finally moves over Oregon and Washington.  The ridge pattern starts to slowly break down on Saturday with only a marginal improvement in smoke dispersal conditions.

2.  DISPERSION

WEDNESDAY

Zone 630 and 632:
Mixing height below 1000 ft during the morning.  Afternoon mixing height rising to 1400 - 2400 ft then lowering below 1000 ft during the evening.

Transport wind NW to N at 4 - 8 mph during the morning.  Transport wind shifts to SW to W at 4 - 8 mph during the afternoon then becomes light and variable and controlled by local terrain during the evening.

Surface wind light and variable and controlled by local terrain.

Zone 633 - 638:
Mixing height below 1000 ft during the morning.  Afternoon mixing height rising to 1400 - 2400 ft then lowering below 1000 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 then becomes light and variable during the evening.

Surface wind light and variable and controlled by local terrain.

OUTLOOK:

THURSDAY
Mixing height below 1000 ft during the morning rising to 1000 to 1600 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.

FRIDAY
Mixing height below 1000 ft throughout the day.  Transport wind light and variable.  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.

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, December 23, 2009.
    ==================================================================

Zone 630 and 632:
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 4:00pm.

Zone 633 - 638:
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 4:00pm.

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