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: Sunday, November 1, 2009       2:40 PM      Jim Little

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

    ** Stable Pattern - Poor Smoke Dispersal Conditions Through Mid-Week **

Upper level heights hold strong in spite of a short wave moving into British Columbia on Monday.  The atmosphere will remain very stable for poor smoke dispersal conditions except for possible brief marginal conditions mid afternoon.  Mixing heights will remain low.  Surface pressure gradients flat for light winds.  Except for some morning fog in the valleys hazy fall sunshine will rule.


    OUTLOOK (TUESDAY-THURSDAY)

The upper ridge builds on Tuesday and surface high pressure increases over the region.  Generally sunny and pleasant weather will continue with light winds and poor smoke dispersal conditions.  Wednesday will be a near repeat of Tuesday with very low mixing heights although winds aloft will increase a bit from the southwest.  Real improvement will not occur until at least Thursday when smoke dispersal conditions will be fair with an upper trough approaching.  This will cool temperatures aloft to help destabilize the atmosphere a bit.  In addition transport winds will be stronger from the south by Thursday.

2.  DISPERSION

MONDAY
Mixing height 2000 - 3000 ft during the morning.  Afternoon mixing height rises to 3300 - 4300 ft then lowers below 1000 ft during the evening.

Transport wind SSW to WSW at 6 - 10 mph during the morning.  Transport wind shifts to WNW to NNW and increases to 10 - 20 mph during the afternoon then shifts to NNW to NNE at 9 - 15 mph during the evening.

Surface wind light and variable and controlled by local terrain during the morning.  Surface wind increases to WNW to NNW at 8 - 12 mph during the afternoon then becomes light and variable during the evening.

OUTLOOK:

TUESDAY
Mixing height below 1000 ft early rising to 1200 - 2200 ft by late morning rising to 2000 - 3000 ft during the afternoon.  Transport wind light and variable during the morning becoming E to SE at 5 - 9 mph during the afternoon.  Surface wind light and variable.

WEDNESDAY
Mixing height below 1000 ft early rising to 1000 - 1700 ft by late morning rising to 2000 - 3000 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.

THURSDAY
Mixing height below 1000 ft during the morning rising to 3500 - 4500 ft during the afternoon.  Transport wind SE to SSW at 6 - 10 mph.  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 Monday, November 2, 2009.
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Avoid ignitions within 15 miles in all directions of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 30 miles in all directions of SSRAs.  Watch for shifting transport winds.  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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