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: Wednesday, October 6, 2010       2:40 PM      Jim Little



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




    THURSDAY
An upper level low that was over California Wednesday tracks northeast across Nevada and thin into Idaho during the day.  This will keep showers in the area but as the low moves to the east subsiding air behind it will suppress mixing heights a bit.  Transport winds will be generally west-northwest to north-northwest. Smoke dispersal conditions will be marginal to fair.
    EXTENDED OUTLOOK (FRIDAY - SUNDAY)
Thursday will see dry weather but increasing clouds during the day from a weather system moving into western Oregon.  Rain from this system should hold off until overnight Thursday then spread eastward during the day on Saturday. Smoke dispersal conditions should be good on Friday, fair on Saturday.  By Sunday Surface high pressure builds in from the west for dry weather.

2.  DISPERSION



THURSDAY

Mixing height 1500 - 2500 ft during the morning.  Afternoon mixing height rises to 2500 - 3500 ft then lowers below 1000 ft during the evening.



Transport wind SSW to WSW at 8 - 12 mph during the morning and afternoon.  Transport wind decreases to SSW to WSW at 4 - 8 mph during the evening.



Surface wind SSW to WSW at 4 - 8 mph during the morning and afternoon.  Surface wind becomes light and variable and controlled by local terrain during the evening.



OUTLOOK:



FRIDAY

Mixing height below 1000 ft early rising to 2500 - 3500 ft by late morning rising above 5000 ft during the afternoon.  Transport wind SSW to WSW at 5 - 9 mph.  Surface wind light and variable during the morning becoming SSW to WSW at 4 - 8 mph during the afternoon.



SATURDAY

Mixing height below 1000 ft early rising to 1500 - 2500 ft by late morning rising to 3500 - 4500 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.



SUNDAY

Mixing height below 1000 ft early rising to 2000 - 3000 ft by late morning rising to 3000 - 4000 ft during the afternoon.  Transport wind NE to E at 4 - 8 mph.  Surface wind ENE to E at 50 - 70 mph during the morning becoming NE to E at 4 - 8 mph during the afternoon.



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

    RANGE PORTION OF ZONE 624

This instruction is valid for burning conducted on Thursday, October 7, 2010.

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Unfavorable burning situation due to generally poor smoke dispersion.  Delay ignitions until 10:00am.  Avoid ignitions within 20 miles in all directions of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 35 miles to the SSW 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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