SMI South Central (Smoke Management Instructions) South Central Smoke Management Instructions

ODF Smoke Management Instructions smi_south_central at listsmart.osl.state.or.us
Mon Mar 30 14:26:27 PDT 2009


SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS
SALEM FORESTRY WEATHER CENTER
OREGON DEPARTMENT OF FORESTRY

ISSUED: Monday, March 30, 2009       2:40 PM      Jim Little

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

A cool upper trough and associated surface cold front will push through the region on Tuesday.  The cooler air aloft will keep the atmosphere unstable for high mixing heights and good smoke dispersal.  Rainfall will be fairly light but most areas should see measurable precipitation.

    OUTLOOK (WEDNESDAY - FRIDAY):

An area of higher pressure aloft Tuesday night will give way to an approaching cold front Wednesday night and early Thursday.  This will lose strength as it moves through, but should also produce precipitation most areas.  By Friday higher pressure will build in and the atmosphere should begin to stabilize leading to less favorable smoke dispersal conditions.


2.  DISPERSION

TUESDAY
Mixing height above 5000 ft throughout the day.  Mixing height lowers to 4000 - 5000 ft during the evening.

Transport wind WNW to NW at 19 - 33 mph during the morning.  Transport wind increases to WNW to NW at 23 - 41 mph during the afternoon and evening.

Surface wind SSW to WSW at 8 - 12 mph during the morning.  Surface wind shifts to W to WNW and increases to 15 - 25 mph during the afternoon then decreases to WSW to WNW at 10 - 16 mph during the evening.

OUTLOOK:

WEDNESDAY
Mixing height 3400 - 4400 ft during the morning and through the afternoon.  Transport wind NW to NNW at 10 - 18 mph during the morning becoming W to NW at 10 - 18 mph during the afternoon.  Surface wind light and variable during the morning becoming WSW to WNW at 8 - 12 mph during the afternoon.

THURSDAY
Mixing height below 1000 ft early rising to 2000 - 3000 ft by late morning rising to 4500 - 5000 ft during the afternoon.  Transport wind W to NW at 10 - 16 mph.  Surface wind W to NW at 10 - 16 mph.

FRIDAY
Mixing height below 1000 ft early rising to 3500 - 4500 ft by late morning rising to 4500 - 5000 ft during the afternoon.  Transport wind WNW to NW at 10 - 18 mph.  Surface wind WNW to NW at 10 - 18 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 Tuesday, March 31, 2009.
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Avoid ignitions within 10 miles to the WNW through NW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 10 miles to the WNW through NNW in or near drainages leading to SSRAs.  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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