SMI Northeast (Smoke Management Instructions) Northeast Oregon 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       2:35 PM      Pete Parsons



1.  DISCUSSION AND FORECAST FOR NORTHEAST FORECAST AREA ZONES 630-638



    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 transport winds.  Transport winds are expected to remain light Saturday, and then turn increasing onshore Sunday, as an upper-level trough, and corresponding cold front, approach the coastline.  That will improve ventilation conditions.



2.  DISPERSION



THURSDAY

Mixing height below 500 ft early rising to 2600 - 3600 ft by late morning.  Afternoon mixing height remains near 2600 - 3600 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:



FRIDAY

Mixing height below 1000 ft early rising to 2000 to 3000 ft by late morning rising to 2900 to 3900 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.



SATURDAY

Mixing height below 1000 ft early rising to 1500 to 2500 ft by late morning rising to 3000 to 4000 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.



SUNDAY

Mixing height below 1000 ft early rising to 2000 to 3000 ft by late morning rising to 3500 to 4500 ft during the afternoon.  Transport wind SSW to WSW at 4 - 8 mph.  Surface wind light and variable during the morning becoming W to NW at 6 - 10 mph during the afternoon.



3.  BURNING INSTRUCTIONS FOR NORTHEAST OREGON ZONES 630-638

    The following considerations should be adhered to in addition to

    the requirements of the Oregon Smoke Management Plan. These

    Instructions are valid for burning conducted on Thursday, September 30, 2010.

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



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.



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

4.  SPECIAL NOTE:



    The smoke management forecaster is available at (503)-

    945-7401. Please call this number and not individual's

    numbers to discuss daily burning.  For large burns (over

    2000 tons) or burns extending over a considerable period,

    please request a special forecast.  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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