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, April 13, 2009       2:40 PM      Jim Little

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

An upper level low remains over the region Tuesday for numerous rain and snow showers.  Mixing heights will be high for good to excellent smoke dispersal conditions.  Transport winds will be mostly westerly and mixing heights favorable for good smoke dispersal.

    OUTLOOK (WEDNESDAY - FRIDAY):

An upper level ridge approaches the Pacific Northwest on Wednesday and will be over the region Thursday and Friday.  Transport winds will become light and variable with the upper ridge Thursday and Friday.  Warmer air aloft with the ridge will suppress mixing heights for deteriorating smoke dispersal conditions.

2.  DISPERSION

TUESDAY
Mixing height above 5000 ft throughout the day.  Mixing height lowers to 1200 - 2200 ft during the evening.

Transport wind NNW to N at 13 - 25 mph during the morning.  Transport wind increases to NNW to N at 18 - 30 mph during the afternoon and evening.

Surface wind WNW to NNW at 10 - 20 mph during the morning.  Surface wind increases to WNW to NW at 15 - 29 mph during the afternoon then decreases to WNW to NNW at 10 - 16 mph during the evening.

OUTLOOK:

WEDNESDAY
Mixing height below 1000 ft early rising to 4200 - 5000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind NNW to N at 20 - 36 mph.  Surface wind WNW to NNW at 9 - 15 mph.

THURSDAY
Mixing height 2500 - 3500 ft during the morning rising to 4000 - 5000 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.

FRIDAY
Mixing height below 1000 ft early rising to 2500 - 3500 ft by late morning and through the afternoon.  Transport wind light and variable during the morning becoming W to NW at 4 - 8 mph during the afternoon.  Surface wind light and variable during the morning becoming WNW to NNW at 5 - 9 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 Tuesday, April 14, 2009.
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Avoid ignitions within 12 miles to the NW through N of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 20 miles to the NW through N in or near drainages leading to SSRAs.  Care needed in selecting units as smoke will likely fumigate along the ground in wind prone areas.

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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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