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: Monday, December 21, 2009       2:40 PM      Jim Little

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

An upper level low pressure area will be over southeast Oregon and move southeasterly out of the state during the day.  Expect some precipitation from this system but the cool air aloft near the low should provide high mixing heights and good smoke dispersal conditions.

    OUTLOOK (WEDNESDAY-FRIDAY)

On Wednesday a strong upper ridge with its axis about 300 miles west of the coastline will settle in.  This will give a cool north to north-northwest upper flow pattern to the region.  Subsidence with the ridge will lower mixing heights and smoke dispersal conditions will become poor to unfavorable.  The ridge slowly moves east Thursday and Friday but remains to the west of the state.  This will keep conditions dry and stable through at least Christmas.

2.  DISPERSION

TUESDAY
Mixing height 3200 - 4200 ft during the morning.  Mixing height rises to above 5000 ft during the afternoon then lowers to 1500 - 2500 ft during the evening.

Transport wind WNW to NNW at 10 - 20 mph.

Surface wind WNW to NNW at 8 - 14 mph during the morning and afternoon.  Surface wind decreases to NNW to NNE at 5 - 9 mph during the evening.

OUTLOOK:

WEDNESDAY
Mixing height below 1000 ft during the morning rising to 1000 - 1700 ft during the afternoon.  Transport wind NNW to NE at 6 - 10 mph during the morning becoming light and variable during the afternoon.

THURSDAY
Mixing height below 1000 ft throughout the day.  Transport wind light and variable.  Surface wind light and variable.

FRIDAY
Mixing height below 1000 ft during the morning rising to 1000 - 2000 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 Tuesday, December 22, 2009.
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Avoid ignitions within 15 miles to the WNW through NNE of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 30 miles to the WNW through NE in or near drainages leading to SSRAs.  Recommend against burning units that will smolder significantly overnight.  Complete ignitions by 3:00pm.

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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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