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

ODF Smoke Management Instructions smi_south_central at listsmart.osl.state.or.us
Tue Nov 9 14:55:24 PST 2010


SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS

SALEM FORESTRY WEATHER CENTER

OREGON DEPARTMENT OF FORESTRY



ISSUED: Tuesday, November 9, 2010       2:40 PM      Jim Little



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




    WEDNESDAY
The weather system that brought rain or snow to much of the region on Tuesday moves south and east on Wednesday while an upper level ridge builds to the west and slowly drifts over the Pacific Northwest.  The ridge should help stabilize the atmosphere.  However, expect mostly cloudy skies and a few lingering showers.  Ventilation conditions will be mostly fair and winds generally northwesterly.
    EXTENDED OUTLOOK (THURSDAY - SATURDAY)
The upper ridge moves through during the day Thursday.  Maximum mixing heights remain suppressed with poor to marginal smoke dispersal conditions.  Winds most areas will be light and variable becoming southerly later in the day.  On Friday a broad ridge again builds over the eastern Pacific and noses in over the Pacific Northwest.  Dryer weather and more sunshine will warm near-surface layers and push maximum mixing heights higher to improve ventilation conditions for both Friday and Saturday.





2.  DISPERSION



WEDNESDAY

Mixing height 2400 - 3400 ft during the morning and afternoon.  Mixing height lowers below 1000 ft during the evening.



Transport wind WNW to NNW at 6 - 10 mph during the morning.  Transport wind shifts to NNW to NE at 5 - 9 mph during the afternoon then increases to NNE to NE at 8 - 14 mph during the evening.



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



OUTLOOK:



THURSDAY

Mixing height below 1000 ft early rising to 1000 - 2000 ft by late morning and through the afternoon.  Transport wind ESE to SSE at 4 - 8 mph during the morning becoming S to SW at 10 - 18 mph during the afternoon.  Surface wind light and variable during the morning becoming S to SW at 5 - 9 mph during the afternoon.



FRIDAY

Mixing height below 1000 ft during the morning rising to 2500 - 3500 ft during the afternoon.  Transport wind NW to NNE at 4 - 8 mph.  Surface wind NW to NNE at 4 - 8 mph.



SATURDAY

Mixing height below 1000 ft early rising to 1000 - 2000 ft by late morning rising to 2500 - 3500 ft during the afternoon.  Transport wind light and variable during the morning becoming WNW to NNW at 4 - 8 mph during the afternoon.  Surface wind light and variable during the morning becoming WNW to NNW 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 Wednesday, November 10, 2010.

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



Avoid ignitions within 15 miles to the WNW through ENE of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 30 miles in all directions of SSRAs.  Verify transport winds away from SSRAs if burning in any other direction.  Watch for shifting transport winds.  Recommend against burning units that will smolder significantly overnight.  Complete ignitions by 2:30pm.



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

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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