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: Monday, December 6, 2010       2:40 PM      Jim Little



NOTE:  With the wind-down in fall burning this office will terminate the daily forecasts and instructions until spring burning commences in the spring.  As always, if you have questions or need information and smoke clearances please call the forecaster line at 503-945-7401 anytime Monday through Friday 7:30am to 5:00pm.



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


    TUESDAY

Upper air charts show a deep low pressure circulation centered about 750 miles west of Oregon on Tuesday.  An upper ridge lies along a line from Nevada through northern Idaho.  A Pacific frontal system will rotate around the offshore low but the high aloft to the east will protect the region from precipitation until overnight Tuesday.  However the ridge will help suppress maximum mixing heights and ventilation conditions will remain marginal.

    EXTENDED OUTLOOK (WEDNESDAY - FRIDAY)

The upper low rotates into the northern Gulf of Alaska on Wednesday and flow over the region veers to more southwesterly. Mixing heights generally improve to fair. On Thursday warmer air aloft stabilizes the atmosphere and ventilation conditions deteriorate to marginal.  A minor upper level disturbance well to the north should allow for higher maximum mixing heights, thus improving ventilation conditions to fair to good.



2.  DISPERSION



TUESDAY

Mixing height below 1000 ft during the morning.  Afternoon mixing height rising to 1700 - 2700 ft then remains near 1700 - 2700 ft during the evening.



Transport wind SSE to SSW at 12 - 22 mph during the morning.  Transport wind increases to S to SW at 20 - 36 mph during the afternoon and evening.



Surface wind SSE to SSW at 6 - 10 mph.



OUTLOOK:



WEDNESDAY

Mixing height 2400 - 3400 ft during the morning and through the afternoon.  Transport wind SSW to SW at 32 - 52 mph during the morning becoming SSW to SW at 19 - 33 mph during the afternoon.  Surface wind SSW to SW at 16 - 30 mph during the morning becoming SSW to SW at 8 - 14 mph during the afternoon.



THURSDAY

Mixing height below 1000 ft during the morning rising to 2000 - 3000 ft during the afternoon.  Transport wind SSE to SSW at 4 - 8 mph.  Surface wind SE to SSW at 4 - 8 mph.



FRIDAY

Mixing height below 1000 ft early rising to 3000 - 4000 ft by late morning and through the afternoon.  Transport wind SW to WNW at 4 - 8 mph.  Surface wind W to NW at 4 - 8 mph.



3.  BURNING INSTRUCTIONS FOR ZONES 624 AND 625 INCLUDING THE WALKER

    RANGE PORTION OF ZONE 624

This instruction is valid for burning conducted on Tuesday, December 7, 2010.

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



Unfavorable burning situation due to very poor smoke dispersion.  Delay ignitions until 10:00am.  Avoid ignitions within 20 miles to the SSE through SW of SSRAs.  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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