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: Wednesday, April 8, 2009       2:40 PM      Nick Yonker

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

Upper level low is moving off to the east today after providing moisture to mainly the southern part of the state.  The next upper trough and cold front will move in tomorrow bringing an increase in moisture again.  Air mass will remain unstable and smoke dispersion decent under light to moderate wind flow.

    OUTLOOK (FRIDAY - SUNDAY):

Upper level trough moves through Friday as it dives to the south into California.  Expect some lingering showers in the cool, unstable air mass.  Snow level will be down near the valley floors.  Minor ridge builds in Saturday providing some warming and drying.  Next stronger front and trough arrive Sunday afternoon and evening bringing a good dose of moisture and wind.  Other than nighttime stability, mixing and smoke dispersion will remain good to excellent through the period.

2.  DISPERSION

THURSDAY
Mixing height below 3000 ft early rising above 5000 ft by late morning.

Transport wind SSW to WSW at 10 - 16 mph throughout the morning and afternoon.  Transport wind shifts to WSW to WNW at 6 - 10 mph during the evening.

Surface wind SE to SSW at 6 - 12 mph.

OUTLOOK:

FRIDAY
Mixing height 4300 - 5000 ft during the morning rising above 5000 ft during the afternoon.  Transport wind NW to NNE at 6 - 10 mph during the morning becoming WNW to NNW at 8 - 12 mph during the afternoon.  Surface wind light and variable during the morning becoming W to NW at 6 - 12 mph during the afternoon.

SATURDAY
Mixing height below 1000 ft early rising to 4000 - 5000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind SW to W at 10 - 16 mph.  Surface wind SW to W at 6 - 10 mph.

SUNDAY
Mixing height below 1000 ft early rising to 2000 - 3000 ft by late morning rising to 4000 - 5000 ft during the afternoon.  Transport wind S to SW at 12 - 24 mph during the morning becoming SW to WSW at 22 - 38 mph during the afternoon.  Surface wind S to SW at 10 - 16 mph during the morning becoming SSW to SW at 12 - 24 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 Thursday, April 9, 2009.
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Avoid ignitions within 10 miles to the SSE through WNW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 10 miles in all directions 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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