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, April 10, 2009       2:40 PM      Nick Yonker

****Smoke management will begin staffing the office 7 days-a-week beginning this Sunday, April 12th.  This will continue until burning declines considerably toward the beginning of summer.  Please call 503-945-7401 if you have questions or waivers to the instructions.****

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

Minor upper level ridge builds into the region on Saturday providing some warming and drying.  A minor disturbance will ride through the ridge and provide variable clouds however.  Air mass will stabilize during the night and early morning hours but daytime surface heating and residual cool air aloft will provide good afternoon mixing.  Other than early morning stability, smoke dispersion will be mostly good.

    OUTLOOK (SUNDAY - TUESDAY):

Upper ridge moves to the east Sunday giving way to a frontal system and upper level trough later Sunday.  Front will move through overnight with considerably cooler air moving in behind.  Snow level will lower from near 8000 ft on Sunday to 4000 - 5000 ft Monday morning.  Upper trough will move through Monday providing cool showers.  Trough moves by to the east Tuesday leaving the region under chilly but drier NW flow.  Smoke dispersion will be mostly good to excellent through the period.

2.  DISPERSION

SATURDAY
Mixing height below 2000 ft early rising to 3200 - 4200 ft by late morning.  Afternoon mixing height rises above 5000 ft then lowers to 1500 - 2500 ft during the evening.

Transport wind WSW to WNW at 6 - 10 mph during the morning.  Transport wind increases to W to NW at 10 - 18 mph during the afternoon then becomes light and variable and controlled by local terrain during the evening.

Surface wind SSW to WSW at 4 - 8 mph during the morning.  Surface wind shifts to WSW to WNW and increases to 9 - 15 mph during the afternoon then becomes light and variable and controlled by local terrain during the evening.

OUTLOOK:

SUNDAY
Mixing height below 1000 ft early rising to 3500 - 4500 ft by late morning and through the afternoon.  Transport wind SSW to WSW at 6 - 10 mph during the morning becoming WSW to W at 10 - 22 mph during the afternoon.  Surface wind light and variable during the morning becoming SW to W at 10 - 18 mph during the afternoon.

MONDAY
Mixing height 4500 - 5000 ft during the morning and through the afternoon.  Transport wind W to WNW at 12 - 22 mph.  Surface wind WSW to WNW at 8 - 12 mph.

TUESDAY
Mixing height 4500 - 5000 ft during the morning and through the afternoon.  Transport wind WNW to NNW at 9 - 15 mph.  Surface wind W to NW at 6 - 10 mph during the morning becoming NW to N at 8 - 12 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 Saturday, April 11, 2009.
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Avoid ignitions within 12 miles to the WSW through NNW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 20 miles to the SSW through NNW in or near drainages leading to SSRAs.

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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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