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: Thursday, April 22, 2010       2:40 PM      Nick Yonker

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

Flat upper level ridge noses into the region overnight and Friday bringing dry and fairly stable conditions tomorrow.  Ridge will shift eastward Friday night.  Expect mostly fair skies with seasonably afternoon temperatures after a frosty morning.  Smoke dispersion will be poor during the morning becoming fair during the afternoon.

    OUTLOOK (SATURDAY - MONDAY):

Upper level trough and minor disturbance moves in early Saturday bringing considerably cooler and unstable conditions Saturday.  Moisture is unlikely however.  Upper level ridge builds back into the region on Sunday, stabilizing the air mass again.  Ridge moves slowly eastward Monday.  Expect good smoke dispersion Saturday, and fair to good dispersion Sunday and Monday after poor mixing during the early morning hours.

2.  DISPERSION

FRIDAY
Mixing height below 1000 ft early rising to 3000 - 4000 ft by late morning.  Afternoon mixing height rises above 5000 ft then lowers below 1000 ft during the evening.

Transport wind light and variable and controlled by local terrain during the morning.  Transport wind increases to W to NW at 8 - 12 mph during the afternoon and evening.

Surface wind light and variable and controlled by local terrain during the morning.  Surface wind increases to W to NNW at 5 - 9 mph during the afternoon then shifts to SW to W at 5 - 9 mph during the evening.

OUTLOOK:

SATURDAY
Mixing height 2500 - 3500 ft during the morning rising above 5000 ft during the afternoon.  Transport wind W to NW at 10 - 16 mph during the morning becoming WSW to WNW at 14 - 28 mph during the afternoon.  Surface wind SW to W at 6 - 12 mph during the morning becoming WSW to WNW at 10 - 20 mph during the afternoon.

SUNDAY
Mixing height below 1000 ft early rising to 3000 - 4000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.

MONDAY
Mixing height below 1000 ft early rising to 2000 - 3000 ft by late morning rising to 3500 - 4500 ft during the afternoon.  Transport wind SE to S at 6 - 10 mph.  Surface wind SE to S at 5 - 9 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 Friday, April 23, 2010.
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Avoid ignitions within 12 miles to the SW through NW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 25 miles to the SW through NW 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


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


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