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: Sunday, November 8, 2009       2:40 PM      Jim Little

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

Temporary ridging should provide for dry weather Monday.  But a Pacific cold front crossing the Cascades should bring some rain to the area late overnight.  Mixing heights should remain high for good smoke dispersal conditions.  .

    OUTLOOK (TUESDAY-THURSDAY)

An upper level trough in the Gulf of Alaska will dominate weather through the outlook period.  The trough will move slowly eastward and be exiting the region by Friday.  Several weather systems will rotate around that upper system and affect the area.  Tuesday looks dry but showers or light rain are likely on Wednesday and Thursday.  Mixing heights should remain high during the afternoons for favorable smoke dispersal conditions.

2.  DISPERSION

MONDAY
Mixing height 2600 - 3600 ft during the morning.  Mixing height rises to above 5000 ft during the afternoon then lowers to 2800 - 3800 ft during the evening.

Transport wind S to SW at 15 - 29 mph during the morning.  Transport wind increases to SSW to WSW at 20 - 34 mph during the afternoon and increases to SSW to WSW at 23 - 41 mph during the evening.

Surface wind S to SW at 10 - 18 mph during the morning and afternoon.  Surface wind decreases to SSW to WSW at 10 - 16 mph during the evening.

OUTLOOK:

TUESDAY
Mixing height 2900 - 3900 ft during the morning rising above 5000 ft during the afternoon.  Transport wind SSW to WSW at 18 - 30 mph during the morning becoming SSW to SW at 13 - 25 mph during the afternoon.  Surface wind SSW to WSW at 10 - 16 mph.

WEDNESDAY
Mixing height below 1000 ft early rising to 2500 - 3500 ft by late morning and through the afternoon.  Transport wind light and variable.  Surface wind light and variable.

THURSDAY
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.

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, November 9, 2009.
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Avoid ignitions within 12 miles to the SSW through SW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 12 miles to the SSW through WSW 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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