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, May 8, 2009       2:40 PM      Nick Yonker

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

Upper level ridge will continue to build over the state today and through the weekend bringing warmer and drier conditions.  Air mass will stabilize during the night and morning hours but daytime heating will bring a period of good mixing.  Wind flow will remain generally light northerly.  Expect mostly fair smoke dispersion.

    OUTLOOK (SUNDAY - TUESDAY):

Ridge reaches its peak over the state on Sunday bringing the warmest temperatures.  However, marine air will move in during the afternoon to evening as a trough and minor front move in on Monday.  Front will bring increased westerly wind flow but not likely any moisture.  Trough moves by to the east on Tuesday.  Air mass will be stable Sunday morning then destabilize during the day.  Air mass will remain mostly unstable Monday and Tuesday under the influence of the trough pattern and brisk westerly flow.

2.  DISPERSION

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

Transport wind NE to E at 5 - 9 mph during the morning.  Transport wind shifts to NW to NNE at 6 - 10 mph during the afternoon and evening.

Surface wind light and variable and controlled by local terrain during the morning.  Surface wind increases to NW to N at 6 - 12 mph during the afternoon and evening.

OUTLOOK:

SUNDAY
Mixing height below 1000 ft early rising to 3800 - 4800 ft by late morning rising above 5000 ft during the afternoon.  Transport wind ESE to SSE at 6 - 12 mph during the morning becoming WSW to WNW at 8 - 14 mph during the afternoon.  Surface wind light and variable during the morning becoming WSW to WNW at 8 - 12 mph during the afternoon.

MONDAY
Mixing height below 1000 ft early rising to 3500 - 4500 ft by late morning rising above 5000 ft during the afternoon.  Transport wind WSW to WNW at 12 - 24 mph.  Surface wind WSW to WNW at 9 - 15 mph.

TUESDAY
Mixing height 3200 - 4200 ft during the morning rising above 5000 ft during the afternoon.  Transport wind WSW to WNW at 15 - 30 mph.  Surface wind WSW to WNW at 10 - 20 mph during the morning becoming WNW to NW at 12 - 24 mph during the afternoon.

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, May 9, 2009.
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Avoid ignitions within 12 miles to the NW through E of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 20 miles in all directions of SSRAs.  Verify transport winds away from SSRAs if burning in any other direction.  Watch for shifting transport winds.

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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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