SMI South Central (Smoke Management Instructions) South Central Smoke Management Instructions

[ODF Smoke Management Instructions]

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS
SALEM FORESTRY WEATHER CENTER
OREGON DEPARTMENT OF FORESTRY

ISSUED: Thursday, April 16, 2009       2:40 PM      Nick Yonker

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

Minor upper level ridge will shift to the east tonight making way for a weak front to move by, mainly to the north of the region tomorrow.  Expect little to no moisture as the Cascades will wring out most of it.  Air mass will destabilize as cooler air moves in aloft.  Mixing will be poor during the morning hours but become good as the dry front moves by.  Expect mostly poor to fair smoke dispersion.

    OUTLOOK (SATURDAY - MONDAY):

Following Friday's front and minor trough, the upper level ridge will build in strongly over the weekend.  Expect considerable warming through the period.  Air mass will remain stable during the night and early morning hours but daytime heating should provide decent mixing during the afternoon on Saturday.  Mixing worsens some Sunday and Monday.  Wind flow will be mostly light offshore to light and variable, making for poor smoke dispersion.

2.  DISPERSION

FRIDAY
Mixing height below 1000 ft early rising to 3000 - 4000 ft by late morning.  Afternoon mixing height rises above 5000 ft then lowers below 1000 ft during the evening.

Transport wind SW to WNW at 6 - 12 mph during the morning.  Transport wind shifts to WNW to NNW and increases to 10 - 16 mph during the afternoon and evening.

Surface wind SW to W at 5 - 9 mph.

OUTLOOK:

SATURDAY
Mixing height below 1000 ft early rising to 2500 - 3500 ft by late morning rising above 5000 ft during the afternoon.  Transport wind E to SE at 5 - 9 mph during the morning becoming light and variable during the afternoon.  Surface wind light and variable.

SUNDAY
Mixing height below 1000 ft early rising to 2500 - 3500 ft by late morning rising to 3500 - 4500 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.

MONDAY
Mixing height below 1000 ft early rising to 2500 - 3500 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 Friday, April 17, 2009.
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Avoid ignitions within 12 miles to the SW through N of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 20 miles in all directions of SSRAs.  Recommend against burning units that will smolder significantly overnight.

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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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