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: Tuesday, April 20, 2010       2:40 PM      Jim Little

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

Upper air charts show a closed low over eastern California/western Nevada and an upper trough moving through British Columbia for Wednesday.  Transport winds will be generally northwesterly and smoke dispersal conditions will be fair to good.

    OUTLOOK (THURSDAY-SATURDAY)

The upper low drifts into Arizona and ridging builds in.  There will be a few scattered showers Thursday, but they will be on the decrease.  Mixing heights will recover for fair to good smoke dispersal conditions.  High pressure and fair weather is likely for Friday and Saturday.  Maximum mixing heights will be quite high and smoke dispersal conditions will depend mainly on local wind directions and speed.

2.  DISPERSION

WEDNESDAY
Mixing height above 5000 ft during the morning.  Mixing height lowers to 4000 - 5000 ft during the afternoon and lowers to 2000 - 3000 ft during the evening.

Transport wind NNW to NNE at 26 - 46 mph during the morning.  Transport wind decreases to N to NNE at 23 - 41 mph during the afternoon and evening.

Surface wind NNW to NNE at 14 - 28 mph during the morning.  Surface wind decreases to NNW to NNE at 12 - 22 mph during the afternoon and evening.

OUTLOOK:

THURSDAY
Mixing height 2100 - 3100 ft during the morning rising above 5000 ft during the afternoon.  Transport wind N to NNE at 20 - 36 mph.  Surface wind NNW to NNE at 10 - 18 mph.

FRIDAY
Mixing height below 1000 ft early rising to 2000 - 3000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.

SATURDAY
Mixing height below 1000 ft early rising to 3100 - 4100 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 Wednesday, April 21, 2010.
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Avoid ignitions within 10 miles to the N through NNE of SSRAs.  Care needed in selecting units as smoke will likely fumigate along the ground in wind prone areas.  No additional restrictions necessary.

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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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