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: Thursday, December 2, 2010       2:40 PM      Jim Little



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


    FRIDAY

Upper air charts show a deep and compact low developing about 500 miles offshore on Friday.  This will pump up a weak ridge over the Pacific Northwest giving dry weather but a very stable atmosphere.  Atmospheric ventilation conditions will be generally poor.

    EXTENDED OUTLOOK (SATURDAY - MONDAY)

The upper low moves to about 600 miles west of San Francisco Saturday and winds aloft back to a more southerly direction.  This brings some light rain northward from California and Nevada.  Amounts will be light and confined mainly to southwestern Oregon. Ventilation conditions remain poor and transport winds generally southerly. On Sunday the upper low off the California coast weakens, upper flow continues southerly and ventilation conditions remain poor to marginal.  Expect little change for Monday.



2.  DISPERSION



FRIDAY

Mixing height 1000 - 2000 ft during the morning and afternoon.  Mixing height lowers below 1000 ft during the evening.



Transport wind E to SE at 4 - 8 mph.



Surface wind light and variable and controlled by local terrain.



OUTLOOK:



SATURDAY

Mixing height 1000 - 1900 ft during the morning and through the afternoon.  Transport wind S to SW at 4 - 8 mph during the morning becoming E to SE at 8 - 12 mph during the afternoon.  Surface wind light and variable.



SUNDAY

Mixing height below 1000 ft during the morning rising to 1000 - 2000 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.



MONDAY

Mixing height below 1000 ft during the morning rising to 1000 - 2000 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, December 3, 2010.

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



Unfavorable burning situation due to very poor smoke dispersion.  Delay ignitions until 10:00am.  Avoid ignitions within 20 miles to the E through SSE of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 35 miles to the E through SW in or near drainages leading to SSRAs.  Verify transport winds away from SSRAs if burning in any other direction.  Recommend against burning units that will smolder significantly overnight.  Complete ignitions by 2:30pm.



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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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