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: Wednesday, October 21, 2009       2:35 PM      Jim Little

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

In the upper atmosphere a ridge builds over the region.  At the surface an area of high pressure pushes in from the southwest and blankets the entire Pacific Northwest by afternoon.  This will suppress mixing heights and give light transport winds to the area.  Mixing heights will allow for only marginal smoke dispersal conditions.

   OUTLOOK (FRIDAY-SUNDAY)

An upper trough approaches the Pacific Northwest on Friday.  The surface high weakens and its center moves east allowing transport winds to pick up and become more southerly.  Mixing heights improve slightly.  Another weather system moves in from the Pacific and rain spreads east during the afternoon on Saturday, but by Sunday a surface high returns for dry weather.  Mixing heights remain in the marginal category through the outlook period.

2.  DISPERSION

THURSDAY
Mixing height 2000 - 3000 ft during the morning.  Afternoon mixing height rises to 3000 - 4000 ft then lowers below 1000 ft during the evening.

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 early rising to 1900 to 2900 ft by late morning rising to 3000 to 4000 ft during the afternoon.  Transport wind SW to W at 8 - 14 mph during the morning becoming WSW to W at 13 - 25 mph during the afternoon.  Surface wind SSW to WSW at 6 - 10 mph during the morning becoming WSW to WNW at 10 - 16 mph during the afternoon.

SATURDAY
Mixing height 1400 to 2400 ft during the morning rising to 3000 to 4000 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 rising to 3000 to 4000 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, October 22, 2009.
    ==================================================================

Avoid ignitions within 15 miles in all directions of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 30 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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