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: Sunday, April 19, 2009       2:40 PM      Jim Little

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


A broad upper level ridge will continue over the Pacific Northwest Monday.  A weak thermal trough will settle in east of the Cascades.  Surface high pressure will be centered offshore.  Mixing heights should reach above 5000 feet after the morning inversion breaks.  Afternoon smoke dispersal conditions should be good to excellent.

    OUTLOOK (TUESDAY - THURSDAY)

The upper ridge flattens in response to an upper level low moving across the northern Gulf of Alaska on Tuesday.  Pressure gradients will be quite flat.  Transport winds will be generally southwesterly.  By Wednesday an upper level trough will be approaching, temperatures aloft will be cooling and the atmosphere will be destabilizing for better smoke dispersal condition.  Transport winds will be mostly south-southwest to southwest. The trough will still be to the northwest on Thursday with more cooling aloft for better smoke dispersal conditions and transport winds will be generally south-southwest.

    OUTLOOK (TUESDAY - THURSDAY):


2.  DISPERSION

MONDAY
Mixing height 1300 - 2300 ft during the morning.  Mixing height rises above 5000 ft during the afternoon then lowers below 1000 ft during the evening.

Transport wind E to SE at 4 - 8 mph during the morning.  Transport wind becomes light and variable and controlled by local terrain during the afternoon then increases to NNE to ENE at 6 - 12 mph during the evening.

Surface wind light and variable and controlled by local terrain during the morning.  Surface wind increases to SSW to WSW at 4 - 8 mph during the afternoon then shifts to NW to N at 4 - 8 mph during the evening.

OUTLOOK:

TUESDAY
Mixing height below 1000 ft early rising to 1100 - 2100 ft by late morning rising above 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming SW to W at 9 - 15 mph during the afternoon.  Surface wind light and variable during the morning becoming WSW to NW at 6 - 12 mph during the afternoon.

WEDNESDAY
Mixing height below 1000 ft early rising to 2000 - 3000 ft by late morning rising to 3500 - 4500 ft during the afternoon.  Transport wind SSW to WSW at 5 - 9 mph during the morning becoming W to NW at 6 - 10 mph during the afternoon.  Surface wind light and variable during the morning becoming WSW to NW at 6 - 10 mph during the afternoon.

THURSDAY
Mixing height below 1000 ft early rising to 4500 - 5000 ft by late morning and through the afternoon.  Transport wind light and variable during the morning becoming WSW to WNW at 10 - 16 mph during the afternoon.  Surface wind light and variable during the morning becoming WSW to WNW at 10 - 16 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 Monday, April 20, 2009.
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Avoid ignitions within 15 miles to the NE through SSE of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 35 miles to the NE through SSE in or near drainages leading to SSRAs.  Verify transport winds away from SSRAs if burning in any other direction.  Recommend against burning units that will smolder significantly overnight.

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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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