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: Wednesday, November 25, 2009       2:40 PM      Nick Yonker

****Due to the Thanksgiving Holiday, state furlough day, and the decrease in burning, the smoke management office will not be staffed from Thursday, Nov. 26th through Sunday, November 29th.  If you have questions about burning through the holiday weekend, please call 503-945-7401 before 5:00 p.m. today.  Forecasts and instructions will be issued Monday morning for burning on Nov. 30th.****

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

Upper level ridge will slide to the east tonight and give way to a frontal system that will slowly approach the region on Thanksgiving afternoon and evening.  Air mass will remain mostly stable but increasing southerly wind flow will improve smoke dispersion.

    OUTLOOK (FRIDAY - SUNDAY):

Cold front moves through early Friday morning with the upper level trough pushing through Friday afternoon.  Expect cool, showery, and unstable conditions as the snow level lowers to the valley floors.  An upper ridge will then nose in on Saturday and strengthen on Sunday.  Expect good smoke dispersion Friday and Saturday, and then worsening dispersion on Sunday.

2.  DISPERSION

THURSDAY
Mixing height below 1000 ft early rising to 1000 - 2000 ft by late morning.  Afternoon mixing height rising to 2500 - 3500 ft and remaining the same through the evening.

Transport wind SSW to SW at 13 - 25 mph.

Surface wind S to SW at 6 - 12 mph.

OUTLOOK:

FRIDAY
Mixing height 3500 - 4500 ft during the morning rising above 5000 ft during the afternoon.  Transport wind SW to W at 12 - 24 mph during the morning becoming NW to N at 12 - 24 mph during the afternoon.  Surface wind SW to W at 6 - 12 mph during the morning becoming NW to N at 8 - 12 mph during the afternoon.

SATURDAY
Mixing height below 1000 ft early rising to 4500 - 5000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind WNW to NNW at 4 - 8 mph.  Surface wind light and variable.

SUNDAY
Mixing height below 1000 ft early rising to 2000 - 3000 ft by late morning and through the afternoon.  Transport wind light and variable during the morning becoming SSE to SSW at 4 - 8 mph during the afternoon.  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, November 26, 2009.
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Delay ignitions until 11 a.m.  Avoid ignitions within 15 miles to the SSW through SW of SSRAs.

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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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