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, October 15, 2010       2:40 PM      Pete Parsons



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



SATURDAY



The upper-level flow is forecast to turn southwesterly, as a splitting weak trough approaches the coastline.  It will spread some clouds across the region but not likely any precipitation.  Some sunshine and increasing onshore transport winds will make for good afternoon smoke dispersal conditions.


OUTLOOK (SUNDAY-TUESDAY)


An upper-level trough is forecast to split apart, as is moves onshore, with the main portion of it dropping southward, across California and Nevada, Sunday through Tuesday.  An upper-level ridge is forecast to build over Oregon for continued dry conditions.  Warming aloft will combine with October's lowering sun angle to strengthen overnight surface-based inversions.  Afternoon smoke dispersal conditions will deteriorate each day, becoming marginal by Monday and poor by Tuesday.



2.  DISPERSION



SATURDAY

Mixing height below 500 ft early rising to 2000 - 3000 ft by late morning.  Afternoon mixing height rises above 5000 ft then lowers below 1000 ft during the evening.



Transport wind light and variable and controlled by local terrain during the morning.  Transport wind increases to SW to W at 8 - 12 mph during the afternoon then shifts and decreases to W to NW at 4 - 8 mph during the evening.



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



OUTLOOK:



SUNDAY

Mixing height below 1000 ft early rising to 2600 - 3600 ft by late morning rising above 5000 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.



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 1500 - 2500 ft by late morning rising to 2700 - 3700 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.



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, October 16, 2010.

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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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