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, November 29, 2010       2:40 PM      Jim Little



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


    TUESDAY
The upper ridge that was over the region Monday moves east on Tuesday leaving southwesterly flow aloft over the Pacific Northwest.  A Pacific front will move in from the west for increasing clouds but no rain is likely until late afternoon.  Mixing heights should be in the 4000-5000 foot range with a south to south-southeast transport wind most areas for fair to good ventilation conditions.
    EXTENDED OUTLOOK (WEDNESDAY - FRIDAY)
Upper flow over the region will be generally west-southwest through the outlook period.  On Wednesday the atmosphere stabilizes for drier conditions.  Maximum mixing heights are suppressed somewhat for mostly fair smoke dispersal conditions.  Tuesday's front is reenergized a bit on Thursday and drifts northward for some periods of light rain, then moves east for dry weather again on Friday.  Ventilation conditions will be generally fair Thursday and Friday.


2.  DISPERSION



TUESDAY

Mixing height below 1000 ft during the morning.  Afternoon mixing height rises to 3100 - 4100 ft and rises to 4000 - 5000 ft during the evening.



Transport wind SW to WSW at 25 - 45 mph during the morning.  Transport wind increases to SSW to WSW at 30 - 50 mph during the afternoon and evening.



Surface wind SSW to WSW at 12 - 22 mph during the morning.  Surface wind increases to SSW to SW at 15 - 29 mph during the afternoon and evening.



OUTLOOK:



WEDNESDAY

Mixing height 3800 - 4800 ft during the morning and through the afternoon.  Transport wind SSW to SW at 20 - 36 mph during the morning becoming SSW to SW at 12 - 24 mph during the afternoon.  Surface wind SSW to SW at 10 - 18 mph during the morning becoming S to SW at 6 - 12 mph during the afternoon.



THURSDAY

Mixing height below 1000 ft early rising to 2000 - 3000 ft by late morning rising to 3000 - 4000 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.



FRIDAY

Mixing height below 1000 ft during the morning rising to 3000 - 4000 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 Tuesday, November 30, 2010.

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Avoid ignitions within 12 miles to the SW through WSW of SSRAs.  Care needed in selecting units as smoke will likely fumigate along the ground in wind prone areas.  No additional restrictions necessary.



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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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