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, December 14, 2009       2:40 PM      Jim Little

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

The Pacific Northwest will be under a strong southwesterly flow aloft on Tuesday.  Forecast upper wind charts indicate a southwesterly jet stream with winds of about 125mph at approximately 30,000 feet.  The remains of a Pacific cold front will keep it cloudy and wet much of the day.  Snow levels should be around 5000 feet.  Mixing heights will be around 4500 feet and transport winds should be fairly brisk from the south.

    OUTLOOK (WEDNESDAY-FRIDAY)

Showers continue Wednesday and mixing heights should remain favorable for good smoke dispersal conditions.  Expect brisk southerly transport winds. A Pacific cold front moves in late Thursday but warm air ahead of that system will hold mixing heights down. The wet southwesterly flow continues for Friday.

2.  DISPERSION

TUESDAY
Mixing height 2600 - 3600 ft during the morning.  Afternoon mixing height rises to 4000 - 5000 ft then lowers to 2100 - 3100 ft during the evening.

Transport wind SSW to SW at 28 - 48 mph during the morning.  Transport wind increases to SSW to SW at 37 - 57 mph during the afternoon and evening.

Surface wind SSW to SW at 15 - 29 mph during the morning.  Surface wind increases to SSW to SW at 20 - 36 mph during the afternoon and evening.

OUTLOOK:

WEDNESDAY
Mixing height 2400 - 3400 ft during the morning rising to 3500 - 4500 ft during the afternoon.  Transport wind SSW to SW at 27 - 47 mph during the morning becoming S to SSW at 18 - 32 mph during the afternoon.  Surface wind SSW to SW at 16 - 26 mph during the morning becoming S to SW at 10 - 16 mph during the afternoon.

THURSDAY
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.

FRIDAY
Mixing height 1200 - 2200 ft during the 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 Tuesday, December 15, 2009.
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Avoid ignitions within 12 miles to the SSW through SW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 20 miles to the SSW through SW in or near drainages leading to SSRAs.  Care needed in selecting units as smoke will likely fumigate along the ground in wind prone areas.

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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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