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: Wednesday, May 20, 2009       2:40 PM      Jim Little

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

Thursday will see a generally west-to-east flow aloft with minor ridging.  The air mass continues its warm up and surface temperatures should be 6-10F warmer than on Wednesday.  Dry weather will prevail through the holiday weekend.  Mixing heights will be high enough to result in good to excellent smoke dispersal conditions.  Transport winds will start out from the southeast but change to westerly during the day.

    OUTLOOK (FRIDAY - SUNDAY)

A weak disturbance will move by to the north Friday night and Saturday with only a few high level clouds.  A ridge of high pressure will slowly build into the area later in the weekend and into next week.  That will ensure continued dry weather with above average temperatures.  Mixing heights should stay favorable for good smoke dispersal conditions afternoons, but nighttime inversions will trap residual smoke near the ground.  Transport winds will be generally northeast through northwest.

2.  DISPERSION

THURSDAY
Mixing height 2700 - 3700 ft during the morning.  Mixing height rises to above 5000 ft during the afternoon then lowers to 1600 - 2600 ft during the evening.

Transport wind light and variable and controlled by local terrain during the morning.  Transport wind increases to WSW to WNW at 8 - 12 mph during the afternoon then shifts and increases to NW to N at 10 - 22 mph during the evening.

Surface wind SSE to SSW at 5 - 9 mph during the morning.  Surface wind shifts to SW to WSW and increases to 10 - 22 mph during the afternoon and evening.

OUTLOOK:

FRIDAY
Mixing height below 1000 ft early rising to 2700 - 3700 ft by late morning rising above 5000 ft during the afternoon.  Transport wind NW to N at 4 - 8 mph during the morning becoming W to NNW at 6 - 12 mph during the afternoon.  Surface wind SSW to SW at 9 - 15 mph during the morning becoming W to WNW at 12 - 24 mph during the afternoon.

SATURDAY
Mixing height 2800 - 3800 ft during the 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 4000 - 5000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind light and variable.  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, May 21, 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.  Care needed in selecting units as smoke will likely fumigate along the ground in wind prone areas.

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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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