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 8, 2009       2:40 PM      Jim Little

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

Wednesday will see continued cold, dry, northerly flow aloft.  A surface high pressure area over northern Idaho will give light southeasterly winds to the region.  Weather will remain dry. Low mixing heights will mean poor smoke dispersal conditions.

    OUTLOOK (THURSDAY-SATURDAY)

Upper flow becomes slightly more northwesterly and the surface high pressure area moves to southeast Wyoming on Thursday.  Low level flow will become southerly and low mixing heights will continue poor smoke dispersal conditions.  On Friday upper flow continues to back and becomes west to northwest over the area.  Mixing heights will remain quite low.  On Saturday an upper trough will move into northern California and spread moisture northward.  This will start out as snow then change to rain.  Mixing heights will rise to near 3000 feet.

2.  DISPERSION

WEDNESDAY
Mixing height below 1000 ft during the morning.  Afternoon mixing height rises to 1000 - 2000 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 SW to W at 8 - 12 mph during the afternoon then becomes light and variable during the evening.

Surface wind light and variable and controlled by local terrain.

OUTLOOK:

THURSDAY
Mixing height below 1000 ft during the morning rising to 1000 - 1700 ft during the afternoon.  Transport wind SW to W at 6 - 10 mph.  Surface wind light and variable.

FRIDAY
Mixing height below 1000 ft during the morning rising to 1000 - 1600 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 rising to 2500 - 3500 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 9, 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 NNE of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 35 miles to the SSW through NNE in or near drainages leading to SSRAs.  Recommend against burning units that will smolder significantly overnight.  Complete ignitions by 3:00am.

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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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