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: Thursday, May 28, 2009       2:40 PM      Nick Yonker

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

Upper level ridge will remain over the region through tomorrow with the axis near the Oregon/Idaho border.  Expect continued mostly sunny skies and warm temperatures.  With southerly flow aloft and warm temperatures, expect scattered late afternoon to evening thundershowers.  Air mass will remain mostly stable during the night and morning with afternoon heating providing a period of good mixing during the day.  Wind flow will remain light and favor a generally NW'erly direction.  Smoke dispersion will be poor to fair.

    OUTLOOK (SATURDAY - MONDAY):

Upper level ridge remains over the region and to the east through the weekend, gradually weakening and allowing an upper low to approach for Monday.  Expect continued sunny skies and warm temperatures with some afternoon to evening thundershowers.  Air mass will continue stable during the night and morning hours with instability during the afternoon.  Wind flow will also remain light leaving the region under poor to fair smoke dispersion.

2.  DISPERSION

FRIDAY
Mixing height below 1000 ft early rising to 2500 - 3500 ft by late morning.  Afternoon mixing height rises above 5000 ft then lowers to 2000 - 3000 ft during the evening.

Transport wind SSE to SW at 4 - 8 mph during the morning.  Transport wind shifts to WSW to WNW and increases to 8 - 14 mph during the afternoon then shifts to NW to NNW at 8 - 12 mph during the evening.

Surface wind light and variable and controlled by local terrain during the morning.  Surface wind increases to WSW to NW at 6 - 12 mph during the afternoon and evening.

OUTLOOK:

SATURDAY
Mixing height below 1000 ft early rising to 2800 - 3800 ft by late morning rising above 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming W to NW at 8 - 14 mph during the afternoon.  Surface wind light and variable during the morning becoming W to NW at 6 - 12 mph during the afternoon.

SUNDAY
Mixing height below 1000 ft early rising to 3500 - 4500 ft by late morning rising above 5000 ft during the afternoon.  Transport wind SW to WNW at 6 - 10 mph during the morning becoming NW to NNW at 9 - 15 mph during the afternoon.  Surface wind light and variable during the morning becoming WNW to NNW at 6 - 12 mph during the afternoon.

MONDAY
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 NW to NNE at 6 - 12 mph during the afternoon.  Surface wind light and variable during the morning becoming NW to N at 6 - 10 mph during the afternoon.

3.  BURNING INSTRUCTIONS FOR ZONES 624 AND 625 INCLUDING THE WALKER
    RANGE PORTION OF ZONE 624
This instruction is valid for burning conducted on Friday, May 29, 2009.
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Avoid ignitions within 12 miles in all directions of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 20 miles in all directions of SSRAs.  Watch for shifting transport winds.

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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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