SMI South Central (Smoke Management Instructions) (no subject)

[ODF Smoke Management Instructions]

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS

SALEM FORESTRY WEATHER CENTER

OREGON DEPARTMENT OF FORESTRY



ISSUED: Tuesday, October 12, 2010       2:40 PM      Jim Little



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


    WEDNESDAY
High pressure aloft continues over the Pacific Northwest on Wednesday, but it is moving slowly eastward.  The axis of the high pressure ridge extends from Nevada to Alberta by mid morning, and by early evening has moved to the northern Rockies.  Expect light winds, generally from the south, and low suppressed mixing heights, but smoke dispersal conditions should be mostly fair.
    EXTENDED OUTLOOK (THURSDAY - SATURDAY)
The upper level ridge will be well to the east by Thursday with southwest flow aloft setting up over the Pacific Northwest.  Cooling aloft will allow for higher maximum mixing heights and improved ventilation conditions.  By Friday models show minor ridging aloft.  Expect fair weather and generally fair smoke dispersal conditions.  Saturday will see southwesterly flow aloft, south-southwesterly transport winds and mostly good smoke dispersal conditions.





2.  DISPERSION



WEDNESDAY

Mixing height 2300 - 3300 ft during the morning.  Afternoon mixing height rises to 3300 - 4300 ft then lowers below 1000 ft during the evening.



Transport wind SSE to SSW at 9 - 15 mph.



Surface wind SSE to SSW at 6 - 12 mph.



OUTLOOK:



THURSDAY

Mixing height below 1000 ft early rising to 3000 - 4000 ft by late morning and through the afternoon.  Transport wind SSW to WSW at 10 - 20 mph during the morning becoming SW to WSW at 14 - 28 mph during the afternoon.  Surface wind S to SW at 6 - 12 mph during the morning becoming SSW to WSW at 10 - 20 mph during the afternoon.



FRIDAY

Mixing height below 1000 ft early rising to 1300 - 2300 ft by late morning rising to 3800 - 4800 ft during the afternoon.  Transport wind light and variable during the morning becoming W to NW at 6 - 12 mph during the afternoon.  Surface wind light and variable.



SATURDAY

Mixing height below 1000 ft early rising to 1700 - 2700 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 Wednesday, October 13, 2010.

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



Avoid ignitions within 15 miles to the SSE through WSW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 30 miles to the SSE through WSW in or near drainages leading to SSRAs.  Recommend against burning units that will smolder significantly overnight.  Complete ignitions by 3:30pm.



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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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