SMI South Central (Smoke Management Instructions) South Central Smoke Management Instructions

[ODF Smoke Management Instructions]

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS
SALEM FORESTRY WEATHER CENTER
OREGON DEPARTMENT OF FORESTRY

ISSUED: Friday, December 18, 2009       2:40 PM      Nick Yonker

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

Cold front pretty much fell apart as it came in last night.  Ridge has rebuilt and is keeping the air mass quite stable.  Next warm front arrives on Saturday increasing the chance of rain.  Expect continued stable conditions with light to moderate southerly winds.  Smoke dispersion will remain poor to fair.

    OUTLOOK (SUNDAY - TUESDAY):

Cold front moves in on Sunday bringing more rain and stronger wind.  Air mass destabilizes.  First upper trough will then follow through late Sunday.  Another cold front and stronger trough moves in Monday morning to afternoon bringing more moisture and considerably cooler air aloft.  Snow level will drop to the valley floors Monday night.  Upper trough will move through early Tuesday followed by chilly NW flow aloft.  Air mass will destabilize further Monday and remain unstable Tuesday.  Expect good to excellent smoke dispersion through the period.

2.  DISPERSION

SATURDAY
Mixing height below 1000 ft early rising to 1000 - 1700 ft by late morning.  Afternoon and evening mixing height similar to late morning.

Transport wind SSW to WSW at 9 - 15 mph during the morning and afternoon.  Transport wind increases to SSW to SW at 10 - 18 mph during the evening.

Surface wind S to SW at 5 - 9 mph.

OUTLOOK:

SUNDAY
Mixing height 1500 - 2500 ft during the morning rising to 2500 - 3500 ft during the afternoon.  Transport wind SSW to SW at 14 - 28 mph during the morning becoming SSW to SW at 20 - 35 mph during the afternoon.  Surface wind S to SW at 8 - 14 mph.

MONDAY
Mixing height 3800 - 4800 ft during the morning and through the afternoon.  Transport wind S to SSW at 18 - 32 mph.  Surface wind SSE to SSW at 10 - 18 mph.

TUESDAY
Mixing height 4500 - 5000 ft during the morning and through the afternoon.  Transport wind WSW to WNW at 15 - 25 mph.  Surface wind WSW to WNW at 9 - 15 mph.

3.  BURNING INSTRUCTIONS FOR ZONES 624 AND 625 INCLUDING THE WALKER
    RANGE PORTION OF ZONE 624
This instruction is valid for burning conducted on Saturday and Sunday, December 19 and 20, 2009.
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For Saturday:

Delay ignitions until 10 a.m.  Avoid ignitions within 15 miles to the SSW through WSW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 25 miles to the SSW through WSW in or near drainages leading to SSRAs.

For Sunday:

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 12 miles to the SSW through WSW in or near drainages leading to SSRAs.  No additional restrictions necessary.

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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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