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: Thursday, November 12, 2009       2:40 PM      Nick Yonker

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

Upper level low is moving through the region today bringing clouds and scattered showers.  This trough will move to the east tonight, then another front and trough approach early Friday.  Snow will move into the region during the late morning to early afternoon.  Air mass will be stable early then destabilize as the front moves in during the day.  Brisk S to W flow will make for good to excellent smoke dispersion.

    OUTLOOK (SATURDAY - MONDAY):

Upper level trough moves by to the east leaving the region under chilly northerly flow for Saturday.  Upper level ridge moves in later Saturday, stabilizing the air mass.  Ridge moves overhead early Sunday providing a dry and fair day.  Ridge will move by to the east Monday but air mass will remain dry and stable.  Wind flow will become light and variable Saturday, then as the ridge moves through Sunday and Monday, winds will increase from the S to SW.  Smoke dispersion will be fair Saturday and Sunday then improve Monday.

2.  DISPERSION

FRIDAY
Mixing height below 1000 ft early rising to 3000 - 4000 ft by late morning.  Afternoon mixing height rises above 5000 ft and remains above 5000 ft through the evening.

Transport wind SSW to WSW at 15 - 25 mph during the morning.  Transport wind shifts to W to WNW at 14 - 28 mph during the afternoon and shifts to NW to NNW at 15 - 25 mph during the evening.

Surface wind SSW to SW at 10 - 20 mph during the morning.  Surface wind shifts to WSW to WNW at 10 - 16 mph during the afternoon and shifts to NW to NNW at 10 - 16 mph during the evening.

OUTLOOK:

SATURDAY
Mixing height 2800 - 3800 ft during the morning and through the afternoon.  Transport wind NNW to NNE at 6 - 10 mph during the morning becoming light and variable during the afternoon.  Surface wind light and variable.

SUNDAY
Mixing height below 1000 ft early rising to 1000 - 2000 ft by late morning rising to 1500 - 2500 ft during the afternoon.  Transport wind SE to SSW at 4 - 8 mph.  Surface wind light and variable.

MONDAY
Mixing height below 1000 ft early rising to 1000 - 2000 ft by late morning and through the afternoon.  Transport wind SE to SSW at 10 - 18 mph.  Surface wind SE to S at 6 - 12 mph.

3.  BURNING INSTRUCTIONS FOR ZONES 624 AND 625 INCLUDING THE WALKER
    RANGE PORTION OF ZONE 624
This instruction is valid for burning conducted on Friday, November 13, 2009.
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Avoid ignitions within 10 miles to the SSW through N of SSRAs.  Watch for shifting transport winds.  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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