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: Wednesday, April 22, 2009       2:40 PM      Nick Yonker

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

Dry cold front will move down from British Columbia this evening to usher in considerably cooler air and variable cloud cover tonight.  Air mass will destabilize overnight and tomorrow as the cooler air moves in aloft.  Upper level trough will move in tomorrow afternoon to keep the air mass mostly unstable.  Expect mostly good smoke dispersion Thursday.

    OUTLOOK (FRIDAY - SUNDAY):

Following the passage of the upper level trough early Friday, the region will remain under cool, northerly flow through the period.  Another minor disturbance may move through the northerly flow on Sunday but no moisture is expected.  Mixing and smoke dispersion will be good through the period.

2.  DISPERSION

THURSDAY
Mixing height below 3000 ft early rising above 5000 ft by late morning.  Mixing height lowers to 3500 - 4500 ft during the evening.

Transport wind NW to NNW at 8 - 14 mph during the morning.  Transport wind increases to WNW to NNW at 12 - 24 mph during the afternoon and evening.

Surface wind W to NW at 6 - 12 mph during the morning.  Surface wind increases to W to NW at 10 - 20 mph during the afternoon and evening.

OUTLOOK:

FRIDAY
Mixing height below 1000 ft early rising above 5000 ft by late morning and through the afternoon.  Transport wind NNW to NNE at 8 - 12 mph during the morning becoming NW to NNW at 10 - 22 mph during the afternoon.  Surface wind NW to N at 4 - 8 mph during the morning becoming WNW to NW at 10 - 18 mph during the afternoon.

SATURDAY
Mixing height 2800 - 3800 ft during the morning rising above 5000 ft during the afternoon.  Transport wind W to NW at 6 - 12 mph.  Surface wind light and variable during the morning becoming W to NW at 8 - 12 mph during the afternoon.

SUNDAY
Mixing height 3200 - 4200 ft during the morning rising above 5000 ft during the afternoon.  Transport wind NW to NNE at 5 - 9 mph.  Surface wind light and variable during the morning becoming NNW to NNE at 8 - 12 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 Thursday, April 23, 2009.
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Avoid ignitions within 10 miles to the WNW through N of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 15 miles to the WNW 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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