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: Monday, May 10, 2010       2:40 PM      Jim Little

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

    TUESDAY

The upper level low that swung into Northern California on Monday moves across Nevada and Utah while an upper level ridge builds off the coast. A chance of mainly mountain showers continues, but the chances will decrease during the day.  Maximum mixing heights should remain high enough for good smoke dispersal conditions.

    OUTLOOK (WEDNESDAY-FRIDAY)

The offshore upper ridge moves over western Oregon Wednesday.  This will give northerly upper level flow to the region with dry weather.  Maximum mixing heights remain above 5000 feet during the afternoon for good smoke dispersal conditions.  Fair skies will allow for the formation of nighttime inversions which will hold smoke from any smoldering units close to the ground during the overnight hours.  By Thursday the upper ridge becomes indistinct.  Winds aloft go light and variable, and lower level transport winds will be quite light as well.  The nighttime inversions continue.  Not much change is expected from Thursday to Friday.

2.  DISPERSION

TUESDAY
Mixing height 2000 - 3000 ft during the morning.  Afternoon mixing height rises to 4300 - 5000 ft then lowers to 3500 - 4500 ft during the evening.

Transport wind NNW to N at 15 - 25 mph during the morning.  Transport wind increases to N to NNE at 20 - 34 mph during the afternoon and evening.

Surface wind NNW to N at 10 - 22 mph during the morning.  Surface wind increases to NNW to NNE at 14 - 28 mph during the afternoon then decreases to NNW to NNE at 10 - 18 mph during the evening.

OUTLOOK:

WEDNESDAY
Mixing height below 1000 ft early rising to 2300 - 3300 ft by late morning rising above 5000 ft during the afternoon.  Transport wind NNE to NE at 10 - 18 mph during the morning becoming N to NE at 6 - 10 mph during the afternoon.  Surface wind N to NE at 6 - 10 mph.

THURSDAY
Mixing height below 1000 ft early rising to 4500 - 5000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.

FRIDAY
Mixing height below 1000 ft early rising to 4500 - 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 Tuesday, May 11, 2010.
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Avoid ignitions within 10 miles to the NW through NNE of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 10 miles to the NW through NE in or near drainages leading to 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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