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: Monday, November 30, 2009       2:40 PM      Jim Little

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

** Unfavorable smoke dispersal conditions through the week **


An upper level ridge in the eastern Pacific and Gulf of Alaska will dominate weather this week.  At the surface a strong surface high pressure area drops out of Canada and heads towards the northern Rockies.  With subsiding air aloft mixing heights will be suppressed.  Expect very light winds. The National Weather Service has issued an Air Stagnation Advisory for south central Oregon at least through Friday.  Poor smoke dispersal conditions on Tuesday will further deteriorate Wednesday and Thursday.

    OUTLOOK (TUESDAY-FRIDAY)

The upper ridge axis noses over into southeast Alaska and western Canada.  This will give northerly flow aloft and keep atmospheric conditions very stable through the week.  Expect unfavorable burning conditions most areas at least through Friday.

2.  DISPERSION

TUESDAY
Mixing height below 1000 ft during the morning.  Afternoon mixing height rises to 1200 - 2200 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 NE to ENE at 8 - 14 mph during the afternoon and evening.

Surface wind light and variable and controlled by local terrain.

OUTLOOK:

WEDNESDAY
Mixing height below 1000 ft during the morning rising to 1200 - 2200 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.

THURSDAY
Mixing height below 1000 ft throughout the day.  Transport wind light and variable.  Surface wind light and variable.

FRIDAY
Mixing height below 1000 ft throughout the day.  Transport wind light and variable.  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 Tuesday, December 1, 2009.
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Unfavorable burning situation due to very poor smoke dispersion.  Delay ignitions until 11:00am.  Avoid ignitions within 20 miles to the NNE through E of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 35 miles to the NNE through E in or near drainages leading to SSRAs.  Recommend against burning units that will smolder significantly overnight.  Complete ignitions by 3:00pm.

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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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