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: Saturday, April 24, 2010       2:35 PM      Nick Yonker

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

Upper level trough will move by to the east tonight and give way to a ridge on Sunday.  Surface high pressure will build in as well and calm the winds overnight.  Air mass stabilizes as warming air moves in aloft.  Expect mostly sunny skies and warm temperatures during the afternoon after a frosty morning.  With weak wind flow and stabilizing air mass, smoke dispersion will be mostly poor to fair.

    OUTLOOK (MONDAY - WEDNESDAY):

Upper level ridge slips by to the east Monday as the next frontal system and major upper level trough move into the state.  Cold front will bring rain into the region late Monday afternoon and spread eastward through the evening.  Wind flow will increase markedly from the south, bringing greatly improved smoke dispersion.  Front will move through on Tuesday as a cold, upper level trough settles over the area Tuesday afternoon and Wednesday.  Expect plenty of showers and possible thundershowers under the chilly air mass.  Air mass destabilizes Monday and remains unstable through the remainder of the period, providing good to excellent smoke dispersion.

2.  DISPERSION

SUNDAY
Mixing height below 1000 ft early rising to 3200 - 4200 ft by late morning.  Afternoon mixing height rises to 4000 - 5000 ft then lowers below 1000 ft during the evening.

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

Surface wind light and variable and controlled by local terrain.

OUTLOOK:

MONDAY
Mixing height 2500 to 3500 ft during the morning rising above 5000 ft during the afternoon.  Transport wind SSE to S at 12 - 22 mph during the morning becoming SSE to SSW at 18 - 32 mph during the afternoon.  Surface wind SE to S at 9 - 15 mph.

TUESDAY
Mixing height 2500 to 3500 ft during the morning rising above 5000 ft during the afternoon.  Transport wind S to SSW at 18 - 32 mph during the morning becoming W to WNW at 15 - 25 mph during the afternoon.  Surface wind S to SSW at 15 - 25 mph during the morning becoming WNW to NW at 10 - 20 mph during the afternoon.

WEDNESDAY
Mixing height 4500 to 5000 ft during the morning rising above 5000 ft during the afternoon.  Transport wind WSW to W at 15 - 25 mph.  Surface wind SW to W at 10 - 20 mph during the morning becoming W to NW at 10 - 20 mph during the afternoon.

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 Sunday, April 25, 2010.
    ==================================================================

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.

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


Nick Yonker
Meteorology Manager
Oregon Department of Forestry
503-945-7451


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