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, September 29, 2010       2:40 PM      Pete Parsons



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



    THURSDAY



A strong upper-level ridge will remain over the Pacific Northwest but shift slightly eastward.  The ridge axis will extend from eastern Nevada northwestward, over eastern Oregon, into British Columbia.  A surface thermal trough will shift inland, into southern Oregon, and extend northwestward to just off the north coast. Suppressed mixing heights and light transport winds will make for marginal ventilation conditions.


    OUTLOOK (FRIDAY-SUNDAY)


The upper-level ridge will weaken and continue to slowly shift eastward.  The surface thermal trough is forecast to shift east of the Cascades Friday with light onshore transport winds.  Transport winds are expected to remain light Saturday, before turning strongly onshore Sunday, in response to an approaching upper-level trough and surface cold front.  That will improve ventilation conditions.



2.  DISPERSION



THURSDAY

Mixing height below 500 ft early rising to 2900 - 3900 ft by late morning.  Afternoon mixing height remains near 2900 - 3900 ft then lowers below 1000 ft during the evening.



Transport wind SE to SSW at 4 - 8 mph during the morning.  Transport wind becomes light and variable and controlled by local terrain during the afternoon and evening.



Surface wind light and variable and controlled by local terrain.



OUTLOOK:



FRIDAY

Mixing height below 1000 ft early rising to 2100 - 3100 ft by late morning rising to 4000 - 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming WSW to WNW at 4 - 8 mph during the afternoon.  Surface wind light and variable during the morning becoming WSW to WNW at 4 - 8 mph during the afternoon.



SATURDAY

Mixing height below 1000 ft early rising to 2000 - 3000 ft by late morning rising to 3700 - 4700 ft during the afternoon.  Transport wind SE to SSW at 4 - 8 mph.  Surface wind light and variable.



SUNDAY

Mixing height below 1000 ft early rising to 2500 - 3500 ft by late morning rising to 4500 - 5000 ft during the afternoon.  Transport wind SW to W at 6 - 10 mph.  Surface wind SW to W at 4 - 8 mph during the morning becoming WSW to WNW at 9 - 15 mph during the afternoon.



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, September 30, 2010.

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Avoid ignitions within 15 miles in all directions of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 30 miles in all directions of SSRAs.  Recommend against burning units that will smolder significantly overnight.  Complete ignitions by 4 p.m.



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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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