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: Tuesday, September 28, 2010       2:40 PM      Jim Little



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


WEDNESDAY
In the upper atmosphere a ridge covers the Pacific Northwest for Wednesday.  The ridge is centered to the south with a generally west to east flow aloft over the region.  Daytime heating should help push mixing heights to around 5000 feet for generally good smoke dispersal conditions.  Winds will be generally northeasterly across the area.
    EXTENDED OUTLOOK (THURSDAY - SATURDAY)
An upper level disturbance moves SW to NE offshore toward southwestern British Columbia on Thursday.  A surface thermal trough will extend from central California into SW Oregon.  Winds will be generally southerly or south-southeasterly.  On Friday the upper ridge retreats slightly eastward and the thermal trough shifts eastward as well.  Transport winds will become south westerly.  Mixing heights remain suppressed.  The upper ridge flattens Saturday but skies will remain fair with good mixing heights and a generally southerly transport wind.


2.  DISPERSION



WEDNESDAY

Mixing height 1200 - 2200 ft during the morning.  Mixing height rises above 5000 ft during the afternoon then lowers below 1000 ft during the evening.



Transport wind light and variable and controlled by local terrain.  Transport wind increases to NE to E at 6 - 12 mph during the evening.



Surface wind light and variable and controlled by local terrain.



OUTLOOK:



THURSDAY

Mixing height below 1000 ft early rising to 3000 - 4000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind ESE to S at 5 - 9 mph during the morning becoming SSW to WSW at 9 - 15 mph during the afternoon.  Surface wind light and variable during the morning becoming SW to WSW at 8 - 12 mph during the afternoon.



FRIDAY

Mixing height below 1000 ft early rising to 4500 - 5000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind SSW to WSW at 4 - 8 mph during the morning becoming W to NW at 4 - 8 mph during the afternoon.  Surface wind light and variable.



SATURDAY

Mixing height below 1000 ft early rising to 1500 - 2500 ft by late morning rising above 5000 ft during the afternoon.  Transport wind S to SW at 4 - 8 mph.  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 Wednesday, September 29, 2010.

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Delay ignitions until 10:00am.  Avoid ignitions within 15 miles in all directions of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 35 miles in all directions of SSRAs.  Recommend against burning units that will smolder significantly overnight.  Complete ignitions by 4:00pm.



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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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