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

[ODF Smoke Management Instructions]

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

ISSUED: Tuesday, October 27, 2009       2:40 PM      Jim Little

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

The Pacific Northwest will be on the eastern edge of a broad upper level ridge in the eastern Pacific on Wednesday.  Surface high pressure covers the region for dry weather.  Expect good mixing heights but light transport winds.

    OUTLOOK (THURSDAY-SATURDAY)

The upper ridge gets suppressed southward Thursday as a strong upper jet develops in the eastern Pacific and into central British Columbia.  The surface high gets pushed southward but any rain should remain well to the north of the region.  Mixing heights stay high, though, and increased transport winds should improve smoke dispersal conditions.  Friday temporary upper ridging will help produce more dry weather.  Favorable mixing heights should make for good smoke dispersal conditions.  Expect more dry weather on Saturday abd smoke dispersal conditions should remain favorable

2.  DISPERSION

WEDNESDAY
Mixing height 3100 - 4100 ft during the morning.  Mixing height rises to above 5000 ft during the afternoon then lowers to 1000 - 1700 ft during the evening.

Transport wind N to NNE at 12 - 22 mph.

Surface wind N to NE at 10 - 18 mph during the morning and afternoon.  Surface wind decreases to NNW to NE at 4 - 8 mph during the evening.

OUTLOOK:

THURSDAY
Mixing height below 1000 ft early rising to 2600 - 3600 ft by late morning rising to 4000 - 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming WSW to WNW at 8 - 14 mph during the afternoon.  Surface wind light and variable during the morning becoming SW to W at 4 - 8 mph during the afternoon.

FRIDAY
Mixing height below 1000 ft early rising to 1500 - 2500 ft by late morning rising to 3500 - 4500 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.

SATURDAY
Mixing height below 1000 ft during the morning rising to 2600 - 3600 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 Wednesday, October 28, 2009.
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Avoid ignitions within 15 miles to the NNW through NE of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 30 miles to the NNW through NE in or near drainages leading to SSRAs.  Recommend against burning units that will smolder significantly overnight.  Complete ignitions by 4:00pm.

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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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