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: Thursday, October 14, 2010       2:40 PM      Pete Parsons



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



FRIDAY



The upper-level flow will turn west-southwesterly, in the wake of a weak cold front that will be exiting the state.  A surface ridge of high pressure will nose onshore with slackening transport winds.  It will be cooler with partly cloudy skies.  Afternoon mixing will be fair to good but transport winds will be light.


OUTLOOK (SATURDAY-MONDAY)


The upper-level flow is forecast to turn a bit more southwesterly on Saturday, which will maintain dry conditions.  Afternoon mixing should continue to be fair to good with transport winds becoming westerly in the afternoon.  An upper-level trough is forecast to move into California on Sunday and will likely circulate some clouds into the region, along with the threat of a shower...mainly south. Afternoon mixing will remain fair to good, but transport winds will become light.  The upper-level trough is forecast to eject into Nevada by Monday with a dry northeasterly flow aloft over south-central Oregon.  Mixing may be suppressed slightly, but increasing northeasterly transport winds will make for fair smoke dispersal conditions.



2.  DISPERSION



FRIDAY

Mixing height below 500 ft early rising to 2300 - 3300 ft by late morning.  Afternoon mixing height rises to 4200 - 5000 ft then lowers below 1000 ft during the evening.



Transport wind light and variable and controlled by local terrain.



Surface wind light and variable and controlled by local terrain.



OUTLOOK:



SATURDAY

Mixing height below 1000 ft early rising to 2400 - 3400 ft by late morning rising above 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming WSW to WNW at 5 - 9 mph during the afternoon.  Surface wind light and variable during the morning becoming W to NW at 4 - 8 mph during the afternoon.



SUNDAY

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.



MONDAY

Mixing height below 1000 ft early rising to 1000 - 2000 ft by late morning rising to 4000 - 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming N to NE at 4 - 8 mph during the afternoon.  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 Friday, October 15, 2010.

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Avoid ignitions within 15 miles in all directions 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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