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: Wednesday, October 7, 2009       2:40 PM      Nick Yonker

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

Upper level ridge will remain anchored off the Pacific Northwest coast through tomorrow keeping skies clear and temperatures pleasant.  Air mass will remain mostly stable.  Light to moderate NW to N winds will keep smoke dispersion poor to fair.

    OUTLOOK (FRIDAY - SUNDAY):

A mostly dry cold front will drop down from the north on Friday bringing some cooling but no moisture.  Air mass will destabilize some as cooler air moves in aloft.  The cooler, northerly flow will remain over the region through Saturday and early Sunday before getting driven eastward by the ridge in the eastern Pacific later Sunday.  Wind flow will turn offshore.

2.  DISPERSION

THURSDAY
Mixing height below 1000 ft early rising to 1500 - 2500 ft by late morning.  Afternoon mixing height rises above 5000 ft then lowers to 1000 - 2000 ft during the evening.

Transport wind light and variable and controlled by local terrain during the morning.  Transport wind increases to NW to N at 10 - 16 mph during the afternoon and evening.

Surface wind light and variable and controlled by local terrain during the morning.  Surface wind increases to NW to N at 8 - 14 mph during the afternoon then decreases to NW to N at 5 - 9 mph during the evening.

OUTLOOK:

FRIDAY
Mixing height below 1000 ft early rising to 2500 - 3500 ft by late morning rising above 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming NNW to NNE at 10 - 18 mph during the afternoon.  Surface wind light and variable during the morning becoming NNW to NNE at 8 - 12 mph during the afternoon.

SATURDAY
Mixing height below 1000 ft early rising to 3000 - 4000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.

SUNDAY
Mixing height below 1000 ft early rising to 3500 - 4500 ft by late morning rising above 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming ENE to ESE at 4 - 8 mph during the afternoon.  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 Thursday, October 8, 2009.
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Delay ignitions until 9 a.m.  Avoid ignitions within 12 miles to the WNW through N of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 25 miles to the SW through N in or near drainages leading to SSRAs.  Complete ignitions by 4 p.m.

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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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