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: Tuesday, December 15, 2009       2:40 PM      Jim Little

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

A west-southwesterly flow aloft will continue on Wednesday.  A weak upper trough moves by to the north but will have only minor effect for this area.  Mixing heights will be generally in the 2000-3000 foot range for marginal smoke dispersal conditions.  Transport winds will be generally southerly.

    OUTLOOK (THURSDAY-SATURDAY)

Surface high pressure will cover the area through the outlook period.  Mixing heights will be low and smoke dispersal conditions will be poor. Transport winds will be generally southerly into the weekend, finally shifting to northwesterly during the day on Saturday.

2.  DISPERSION

WEDNESDAY
Mixing height 1000 - 2000 ft during the morning.  Afternoon mixing height rises to 2000 - 3000 ft then lowers to 1500 - 2500 ft during the evening.

Transport wind SW to WSW at 25 - 43 mph during the morning.  Transport wind decreases to SW to WSW at 19 - 33 mph during the afternoon and decreases to SW to WSW at 15 - 29 mph during the evening.

Surface wind SSW to SW at 13 - 25 mph during the morning.  Surface wind decreases to SSW to WSW at 9 - 15 mph during the afternoon and evening.

OUTLOOK:

THURSDAY
Mixing height below 1000 ft throughout the day.  Transport wind SSW to WSW at 8 - 12 mph during the morning becoming light and variable during the afternoon.  Surface wind light and variable.

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

SATURDAY
Mixing height below 1000 ft early rising to 1000 - 2000 ft by late morning rising to 2000 - 3000 ft during the afternoon.  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 Wednesday, December 16, 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 SW through WSW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 35 miles to the SSW through WSW in or near drainages leading to SSRAs.  Care needed in selecting units as smoke will likely fumigate along the ground in wind prone areas.  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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