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 6, 2009       2:40 PM      Jim Little

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

An upper level ridge axis will remain about 600 miles west of the coastline.  Clockwise flow around that ridge leaves the Pacific Northwest in a generally north or northwesterly flow pattern aloft.  Surface temperatures at the surface will be warm enough and temperatures aloft will be cool enough to provide high mixing heights and good smoke dispersal conditions.

OUTLOOK (THURSDAY-SATURDAY)

The pattern changes little for Thursday with northwesterly flow aloft over the region for dry weather.  By Friday the ridge axis moves a little closer and sharpens although it is still some 500 miles west of the coastline.  A pattern change begins on Saturday as the ridge weakens and splits.  This will eventually allow a Pacific system to undercut the ridge and bring rain to the region the first part of next week.

2.  DISPERSION

WEDNESDAY
Mixing height 2700 - 3700 ft during the morning.  Mixing height rises to above 5000 ft during the afternoon then lowers to 3400 - 4400 ft during the evening.

Transport wind light and variable and controlled by local terrain during the morning.  Transport wind increases to NNW to NNE at 10 - 18 mph during the afternoon and increases to N to NNE at 15 - 25 mph during the evening.

Surface wind light and variable and controlled by local terrain during the morning.  Surface wind increases to NNW to NNE at 9 - 15 mph during the afternoon then shifts and decreases to NNW to NE at 6 - 10 mph during the evening.

OUTLOOK:

THURSDAY
Mixing height below 1000 ft early rising to 1800 - 2800 ft by late morning rising above 5000 ft during the afternoon.  Transport wind NNE to ENE at 8 - 14 mph during the morning becoming NNW to NE at 6 - 10 mph during the afternoon.  Surface wind NNE to ENE at 4 - 8 mph during the morning becoming NNW to NE at 5 - 9 mph during the afternoon.

FRIDAY
Mixing height below 1000 ft early rising to 2500 - 3500 ft by late morning rising above 5000 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.

SATURDAY
Mixing height below 1000 ft early rising to 2100 - 3100 ft by late morning rising to 4200 - 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 Wednesday, October 7, 2009.
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Avoid ignitions within 12 miles to the WNW through NE of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 20 miles to the WNW through ENE in or near drainages leading to SSRAs.

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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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