SMI South Central (Smoke Management Instructions) South Central Oregon Smoke Management Instructions

[ODF Smoke Management Instructions]

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

ISSUED: Wednesday, April 29, 2009       2:40 PM      Jim Little

1.  DISCUSSION AND FORECAST FOR SOUTH CENTRAL OREGON ZONES 624 AND 625

The upper low that brought wet, cool weather to the Pacific Northwest has been slow to move out but by Thursday afternoon should be just a memory.  There may still be some scattered showers around but by afternoon skies should turn to partly cloudy to mostly sunny.  Transport winds will be generally northwesterly to westerly. Mixing heights should remain high for favorable smoke dispersal conditions.

    OUTLOOK (FRIDAY-SUNDAY):

Overnight Thursday a Pacific weather system approaches Oregon from the southwest.  Rain will reach the southwestern part of the state early, and some light rain will spread east of the Cascades during the day.  Transport winds should be generally southerly most areas.  Smoke dispersal conditions should remain favorable.  Another Pacific cold front approaches during the day on Saturday and ushers in a moist west-southwest flow over the region that will continue Sunday for wet weather.  Mixing heights remain favorable for good smoke dispersal throughout the outlook period.

2.  DISPERSION

THURSDAY
Mixing height above 5000 ft during the morning and afternoon.  Mixing height lowers below 1000 ft during the evening.

Transport wind light and variable and controlled by local terrain.  Transport wind increases to ENE to ESE at 4 - 8 mph during the evening.

Surface wind light and variable and controlled by local terrain during the morning.  Surface wind increases to SSW to WSW at 5 - 9 mph during the afternoon then shifts to WSW to NW at 6 - 10 mph during the evening.

OUTLOOK:

FRIDAY
Mixing height below 1000 ft early rising above 5000 ft by late morning and through the afternoon.  Transport wind SE to SSE at 12 - 22 mph.  Surface wind ESE to SSE at 8 - 12 mph.

SATURDAY
Mixing height below 1000 ft early rising above 5000 ft by late morning and through the afternoon.  Transport wind light and variable during the morning becoming WSW to WNW at 8 - 12 mph during the afternoon.  Surface wind light and variable during the morning becoming WSW to WNW at 8 - 12 mph during the afternoon.

SUNDAY
Mixing height below 1000 ft early rising above 5000 ft by late morning and through the afternoon.  Transport wind WNW to NW at 10 - 18 mph.  Surface wind WNW to NW at 10 - 18 mph.

3.  BURNING INSTRUCTIONS FOR ZONES 624 AND 625 INCLUDING THE WALKER
    RANGE PORTION OF ZONE 624
This instruction is valid for burning conducted on Thursday, April 30, 2009.
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Avoid ignitions within 12 miles in all directions of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 20 miles in all directions of SSRAs.  Complete ignitions by 4pm

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4.  SPECIAL NOTE:

    The smoke management forecaster is available at (503)
    945-7401.  The smoke management forecaster is available
    to discuss specific burns.  The duty forecaster phone
    number is (503) 945-7401. Please call this number and
    not individual's numbers to discuss daily burning. Please
    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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