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: Wednesday, December 2, 2009       2:40 PM      Jim Little

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

An upper ridge will cover the eastern Pacific on Thursday with upper flow generally northerly over the Pacific Northwest.  This is a dry pattern with cool night-time temperatures.  In the north offshore flow will be quite brisk but expect only light easterly flow in the south.  Mixing heights will be low for poor to marginal smoke dispersal conditions.


    OUTLOOK (FRIDAY-SUNDAY)

On Friday an upper level trough over southwest Canada will drop south-southeast into the region.  Moisture will be limited but there is a possibility of some snow flurries with this system.  The low will settle in over the area for Saturday and Sunday.  Models differ on the exact location and configuration of this low but there seems to be consensus on only limited moisture.  Temperatures will be very cold, coldest of the season, and there will be a continued possibility of snow flurries.  With the upper low mixing heights will rise for improved smoke dispersal conditions.

2.  DISPERSION

THURSDAY
Mixing height below 1000 ft during the morning.  Afternoon mixing height rises to 1000 - 2000 ft then lowers below 1000 ft during the evening.

Transport wind light and variable and controlled by local terrain.  Transport wind increases to ESE to S at 6 - 10 mph during the evening.

Surface wind light and variable and controlled by local terrain.

OUTLOOK:

FRIDAY
Mixing height below 1000 ft during the morning rising to 1000 - 1700 ft during the afternoon.  Transport wind SSW to WSW at 8 - 14 mph during the morning becoming WSW to WNW at 10 - 20 mph during the afternoon.  Surface wind S to SW at 4 - 8 mph.

SATURDAY
Mixing height below 1000 ft early rising to 2000 - 3000 ft by late morning rising to 3500 - 4500 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.

SUNDAY
Mixing height below 1000 ft early rising to 1800 - 2800 ft by late morning rising to 4500 - 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 Thursday, December 3, 2009.
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Unfavorable burning situation due to very poor smoke dispersion.  Delay ignitions until 11:00am.  Avoid ignitions within 20 miles to the NE through S 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.

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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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