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, November 24, 2009       2:40 PM      Jim Little

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

        ** Unfavorable burning situation due to very poor smoke dispersion. **

An upper level ridge of high pressure still dominates Pacific Northwest weather on Wednesday.  The ridge axis will be on a line from central Nevada, across northeast Oregon and into northern Idaho.  Upper flow will be from the southwest but any rain will be well to the north of Oregon.  Low mixing heights and light winds will prevail.  Recommend against any burning as smoke dispersal conditions will be very poor.

    OUTLOOK (THURSDAY-SATURDAY)

On Thanksgiving Day the upper ridge moves east and an upper trough slowly approaches the Pacific Northwest.  A Pacific cold front will move into western Oregon during the day and cooler air aloft should help to destabilize the atmosphere somewhat.  Additional destabilization should improve dispersal conditions Friday.  By Saturday temporary high pressure again takes over for deteriorating smoke dispersal conditions.

2.  DISPERSION

WEDNESDAY
Mixing height below 1000 ft throughout the day.

Transport wind S to SW at 10 - 16 mph.

Surface wind S to SW at 4 - 8 mph during the morning.  Surface wind becomes light and variable and controlled by local terrain during the afternoon and evening.

OUTLOOK:

THURSDAY
Mixing height below 1000 ft early rising to 1000 - 2000 ft by late morning rising to 3000 - 4000 ft during the afternoon.  Transport wind S to SW at 10 - 18 mph during the morning becoming SSW to SW at 20 - 34 mph during the afternoon.  Surface wind S to SW at 6 - 10 mph.

FRIDAY
Mixing height 1500 - 2500 ft during the morning rising to 3000 - 4000 ft during the afternoon.  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 and through 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 Wed, November 25, 2009.
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Unfavorable burning situation due to very poor smoke dispersion.  Delay ignitions until 10:00am.  Avoid ignitions within 20 miles to the S through SW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 35 miles to the S through SW 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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