SMI South Central (Smoke Management Instructions) South Central Smoke Management Instructions

[ODF Smoke Management Instructions]

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS

SALEM FORESTRY WEATHER CENTER

OREGON DEPARTMENT OF FORESTRY



ISSUED: Friday, September 24, 2010       2:40 PM      Pete Parsons



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


    SATURDAY


Southwesterly flow aloft will begin to increase Saturday, as a broad upper-level ridge shifts east of Oregon.  Sunny skies will provide the heating necessary to replace morning inversions with good afternoon mixing.  Increasing transport wind speeds will improve daytime ventilation conditions.


    OUTLOOK (SUNDAY-TUESDAY)


A very weak weather system is forecast to move onshore Sunday, with some high clouds likely streaming into the region.  Daytime smoke dispersion should be good.  The upper-level ridge is forecast to rebuild Monday with morning inversions and slackening transport winds.  Increasing southwesterly flow aloft is forecast to bring another weak system into western Washington and northwestern Oregon Tuesday.  Increasing transport winds should improve daytime ventilation conditions with good afternoon mixing.



2.  DISPERSION



SATURDAY

Mixing height below 500 ft early rising to 3000 - 4000 ft by late morning.  Afternoon mixing height rises above 5000 ft then lowers below 1000 ft during the evening.



Transport wind S to SW at 8 - 14 mph during the morning and afternoon.  Transport wind decreases to SW to W at 4 - 8 mph during the evening.



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



OUTLOOK:



SUNDAY

Mixing height below 1000 ft early rising to 3000 - 4000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind SSW to WSW at 6 - 10 mph during the morning becoming WSW to WNW at 6 - 10 mph during the afternoon.  Surface wind light and variable during the morning becoming WSW to NW at 5 - 9 mph during the afternoon.



MONDAY

Mixing height below 1000 ft early rising to 2000 - 3000 ft by late morning rising to 4000 - 5000 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.



TUESDAY

Mixing height below 1000 ft early rising to 2000 - 3000 ft by late morning rising to 4500 - 5000 ft during the afternoon.  Transport wind SW to W at 4 - 8 mph during the morning becoming WSW to WNW at 8 - 12 mph during the afternoon.  Surface wind light and variable during the morning becoming W to NW at 8 - 12 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 Saturday and Sunday, September 25 and 26, 2010.

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For Saturday:



Avoid ignitions within 15 miles to the S through W of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 30 miles to the S through W in or near drainages leading to SSRAs.  Recommend against burning units that will smolder significantly overnight.  Complete ignitions by 4 p.m.



For Sunday:



Avoid ignitions within 15 miles to the SSW through NNW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 30 miles in all directions of SSRAs.  Recommend against burning units that will smolder significantly overnight.  Complete ignitions by 4 p.m.



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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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