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, November 23, 2009       2:40 PM      Jim Little

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

An upper ridge of high pressure remains over the region on Tuesday producing stagnant conditions with light winds and low mixing heights.  Smoke dispersal conditions will be poor and recommend against burning Tuesday and Wednesday.  Mixing heights will generally be in the 1000-1500 foot range.  While light, transport winds will have a southerly tendency.

    OUTLOOK (WEDNESDAY-FRIDAY)

On Wednesday the upper ridge axis shifts east but the ridge itself still dominates Pacific Northwest weather.  Low mixing heights and light winds continue.  By Thanksgiving Day the ridge will be off to the east and an upper level trough will approach.  A weakening Pacific cold front will spread rain into western Oregon late in the day.  Smoke dispersal conditions will improve, especially in the south.  Friday looks showery with another weak Pacific cold front late in day.  Expect fair to good smoke dispersal conditions.


2.  DISPERSION

TUESDAY
Mixing height below 1000 ft during the morning.  Afternoon mixing height rises to 1000 - 1800 ft then lowers below 1000 ft during the evening.

Transport wind light and variable and controlled by local terrain.

Surface wind light and variable and controlled by local terrain.

OUTLOOK:

WEDNESDAY
Mixing height below 1000 ft during the morning rising to 1200 - 2200 ft during the afternoon.  Transport wind SE to S at 6 - 10 mph during the morning becoming S to SSW at 8 - 12 mph during the afternoon.  Surface wind light and variable.

THURSDAY
Mixing height below 1000 ft during the morning rising to 2300 - 3300 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.

FRIDAY
Mixing height 3000 - 4000 ft during the morning rising to 3700 - 4700 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 Tue, November 24.
    ==================================================================

Unfavorable burning situation due to very poor smoke dispersion.  Delay ignitions until 10:00am.  Avoid ignitions within 20 miles in all directions of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 35 miles in all directions of SSRAs.  Recommend against burning units that will smolder significantly overnight.  Complete ignitions by 3:00pm.

    ==============================================================
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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