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

[ODF Smoke Management Instructions]

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

ISSUED: Friday, October 30, 2009       2:40 PM      Nick Yonker

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

Upper level ridge will move off to the east tonight giving way to a cold front that will move through the region on Saturday.  The front will provide a chance of some light rain, but overall, moisture amounts will be quite limited.  Cooler air follows the front but since the trough is not too deep, snow levels will not get as low as earlier in the week.  Air mass briefly destabilizes tomorrow afternoon as the trough passes, providing decent smoke dispersion.

    OUTLOOK (SUNDAY - TUESDAY):

Upper level ridge rebuilds rather quickly on Sunday with the air mass stabilizing through the day.  Upper ridge will remain over the state for the rest of the period further stabilizing the air mass.  Expect mostly sunny skies.

2.  DISPERSION

SATURDAY
Mixing height below 1000 ft early rising to 2500 - 3500 ft by late morning.  Afternoon mixing height rising to 3800 - 4800 ft and remaining the same through the evening.

Transport wind SW to WSW at 14 - 28 mph during the morning.  Transport wind decreases to WSW to WNW at 12 - 22 mph during the afternoon and decreases to W to NW at 9 - 15 mph during the evening.

Surface wind SW to W at 10 - 20 mph during the morning and afternoon.  Surface wind becomes light and variable and controlled by local terrain during the evening.

OUTLOOK:

SUNDAY
Mixing height below 1000 ft early rising to 1800 - 2800 ft by late morning rising to 2700 - 3700 ft during the afternoon.  Transport wind light and variable during the morning becoming NE to E at 5 - 9 mph during the afternoon.  Surface wind light and variable during the morning becoming NE to E at 4 - 8 mph during the afternoon.

MONDAY
Mixing height below 1000 ft early rising to 1000 - 2000 ft by late morning rising to 1700 - 2700 ft during the afternoon.  Transport wind SSE to SSW at 5 - 9 mph during the morning becoming SW to WNW at 6 - 10 mph during the afternoon.  Surface wind light and variable.

TUESDAY
Mixing height below 1000 ft early rising to 1000 - 2000 ft by late morning and through the afternoon.  Transport wind SW to W at 6 - 12 mph during the morning becoming WNW to NW at 8 - 12 mph during the afternoon.  Surface wind light and variable.

3.  BURNING INSTRUCTIONS FOR ZONES 624 AND 625 INCLUDING THE WALKER
    RANGE PORTION OF ZONE 624
This instruction is valid for burning conducted on Saturday, October 31, 2009.
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Avoid ignitions within 10 miles to the SW through NW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 15 miles to the SW through NNE in or near drainages leading to SSRAs.

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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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