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: Sunday, October 10, 2010       2:40 PM      Jim Little



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


    MONDAY
The remains of Sunday's cold front are well to the east on Monday.  Upper level flow is nearly due west to east but there is a hint of an upper level ridge building offshore.  There may be some patchy fog in some valley locations otherwise expect fair weather.  Transport winds will be generally north-northeasterly and mixing heights should allow for fair smoke dispersal conditions.
    EXTENDED OUTLOOK (TUESDAY - THURSDAY)
The ridge aloft continues to develop Tuesday.  Initially it will be offshore but it will drift eastward to over the Pacific Northwest by afternoon.  Warm air aloft and sinking air with the upper ridge will suppress mixing.  By Wednesday the upper ridge axis will extend from central Nevada, through central Oregon and northward to Alberta.  It will continue its eastward drift.  Maximum mixing heights will continue to be suppressed and ventilation conditions will be only fair.  On Thursday the upper ridge continues its push east.  Flow aloft becomes southwesterly and temperatures aloft begin to cool.  This will help maximum mixing heights recover to a more favorable level.  Transport winds will be generally southerly or south-southwesterly.

2.  DISPERSION



MONDAY

Mixing height 1500 - 2500 ft during the morning.  Afternoon mixing height rises to 3300 - 4300 ft then lowers below 1000 ft during the evening.



Transport wind N to NE at 5 - 9 mph during the morning.  Transport wind increases to N to NE at 9 - 15 mph during the afternoon and evening.



Surface wind light and variable and controlled by local terrain during the morning.  Surface wind increases to N to NE at 8 - 12 mph during the afternoon then decreases to NE to E at 4 - 8 mph during the evening.



OUTLOOK:



TUESDAY

Mixing height below 1000 ft early rising to 1000 - 1900 ft by late morning rising to 2800 - 3800 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.



WEDNESDAY

Mixing height below 1000 ft early rising to 1000 - 2000 ft by late morning rising to 2800 - 3800 ft during the afternoon.  Transport wind light and variable during the morning becoming SE to S at 4 - 8 mph during the afternoon.  Surface wind light and variable.



THURSDAY

Mixing height below 1000 ft early rising to 1000 - 2000 ft by late morning rising to 4500 - 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming S to SW at 4 - 8 mph during the afternoon.  Surface wind light and variable during the morning becoming S to SW 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 Monday, October 11, 2010.

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



Unfavorable burning situation due to very poor smoke dispersion.  Delay ignitions until 10:00am.  Avoid ignitions within 20 miles to the N through E of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 35 miles to the N through SSE 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 3:30pm.



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

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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