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: Monday, October 19, 2009       2:40 PM      Jim Little

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

An upper level ridge moves west-to-east over Oregon during the day on Tuesday.  Surface pressure gradients will be weak.  Expect light southerly transport winds early, becoming light westerly later in the day. Mixing heights should be high enough to give fair smoke dispersal conditions.

    OUTLOOK (WEDNESDAY-FRIDAY)

The ridge axis moves east and an upper trough moves into British Columbia and Washington on Wednesday.  The trailing cold front will move across the state during the day.  Any rain reaching south central Oregon should be light.  Smoke dispersal conditions Wednesday will be marginal to fair.  Thursday and Friday an upper ridge builds over the area for dry weather and light winds.  Smoke dispersal conditions should be generally marginal to fair for the area.

2.  DISPERSION

TUESDAY
Mixing height 1800 - 2800 ft during the morning.  Afternoon mixing height rises to 3500 - 4500 ft then lowers below 1000 ft during the evening.

Transport wind light and variable and controlled by local terrain.  Transport wind increases to SSW to WSW at 5 - 9 mph during the evening.

Surface wind light and variable and controlled by local terrain.

OUTLOOK:

WEDNESDAY
Mixing height below 1000 ft early rising to 2700 - 3700 ft by late morning rising above 5000 ft during the afternoon.  Transport wind SSW to WSW at 10 - 18 mph during the morning becoming WSW to W at 15 - 25 mph during the afternoon.  Surface wind SSW to WSW at 6 - 10 mph during the morning becoming WSW to WNW at 10 - 20 mph during the afternoon.

THURSDAY
Mixing height below 1000 ft early rising to 1000 - 2000 ft by late morning rising to 3000 - 4000 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.

FRIDAY
Mixing height below 1000 ft early rising to 1500 - 2500 ft by late morning rising to 3500 - 4500 ft during the afternoon.  Transport wind SSW to WSW at 6 - 10 mph.  Surface wind light and variable during the morning becoming SW to W at 4 - 8 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 Tuesday, October 20, 2009.
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Avoid ignitions within 15 miles in all directions of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 30 miles in all directions of SSRAs.  Recommend against burning units that will smolder significantly overnight.  Complete ignitions by 4:00pm.

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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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