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: Sunday, May 2, 2010       2:40 PM      Jim Little

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

    MONDAY

The flat upper ridge that was over the region Sunday gets suppressed as a cold upper trough digs into British Columbia and extends southward into Oregon.  The associated cold front brings clouds but precipitation should stay mostly to the north of the region.  The remains of that front move through Monday evening and will bring windy conditions to the area.  Smoke dispersal conditions should be good with quite high mixing heights.

    OUTLOOK (TUESDAY-THURSDAY)

The cold upper trough lies east to west over the region on Tuesday with an upper low closing off in southern Washington by evening.  Precipitation should remain to the north of the region but skies will be mostly cloudy.  Cool temperatures will continue with highs well below average for early May.  Minor ridging aloft begins by Thursday.  While mixing heights remain high throughout the outlook period for generally good smoke dispersal conditions, transport winds will become light and variable by Thursday which could limit opportunities some areas by that time.

2.  DISPERSION

MONDAY
Mixing height above 5000 ft during the morning.  Mixing height lowers to 3300 - 4300 ft during the afternoon then rises to 3900 - 4900 ft during the evening.

Transport wind SW to W at 21 - 37 mph during the morning.  Transport wind increases to WSW to WNW at 25 - 45 mph during the afternoon then decreases to WSW to WNW at 21 - 37 mph during the evening.

Surface wind SW to W at 15 - 29 mph during the morning and afternoon.  Surface wind decreases to W to WNW at 12 - 24 mph during the evening.

OUTLOOK:

TUESDAY
Mixing height below 1000 ft early rising above 5000 ft by late morning and through the afternoon.  Transport wind light and variable during the morning becoming W to WNW at 10 - 22 mph during the afternoon.  Surface wind light and variable during the morning becoming W to NW at 10 - 16 mph during the afternoon.

WEDNESDAY
Mixing height 3200 - 4200 ft during the morning rising above 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming NW to NNW at 8 - 12 mph during the afternoon.  Surface wind NW to N at 6 - 12 mph.

THURSDAY
Mixing height 2800 - 3800 ft during the 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 Monday, May 3, 2010.
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Avoid ignitions within 10 miles to the WSW through WNW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 15 miles to the WSW through NW 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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