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, September 30, 2010       2:40 PM      Pete Parsons



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



    FRIDAY



A strong upper-level ridge will remain over the Pacific Northwest but shift slightly eastward.  The surface thermal trough is forecast to shift east of the Cascades with light onshore transport winds.  Ventilation conditions will be marginal due to suppressed mixing heights and light transport winds.  However, increasing onshore transport winds will improve ventilation conditions late in the day.


    OUTLOOK (SATURDAY-MONDAY)


The upper-level ridge will weaken and continue to slowly shift eastward.  Transport winds are expected to be light Saturday, before turning strongly onshore Sunday, in response to an approaching upper-level trough and surface cold front.  That will improve ventilation conditions.  Some showers are possible late Sunday and Monday, with the passage of an upper-level trough.



2.  DISPERSION



FRIDAY

Mixing height below 500 ft early rising to 1900 - 2900 ft by late morning.  Afternoon mixing height rises to 3500 - 4500 ft then lowers below 1000 ft during the evening.



Transport wind light and variable and controlled by local terrain.  Transport wind increases to W to NW at 5 - 9 mph during the evening.



Surface wind light and variable and controlled by local terrain.



OUTLOOK:



SATURDAY

Mixing height below 1000 ft early rising to 1500 - 2500 ft by late morning rising to 3500 - 4500 ft during the afternoon.  Transport wind light and variable during the morning becoming SSW to WSW at 5 - 9 mph during the afternoon.  Surface wind light and variable.



SUNDAY

Mixing height below 1000 ft early rising to 2500 - 3500 ft by late morning rising to 4500 - 5000 ft during the afternoon.  Transport wind SW to W at 6 - 10 mph.  Surface wind SW to W at 4 - 8 mph during the morning becoming WSW to WNW at 9 - 15 mph during the afternoon.



MONDAY

Mixing height below 1000 ft early rising to 2500 - 3500 ft by late morning rising to 4500 - 5000 ft during the afternoon.  Transport wind W to NW at 8 - 12 mph during the morning becoming WNW to NNW at 10 - 20 mph during the afternoon.  Surface wind W to NW at 6 - 10 mph.



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 1, 2010.

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Delay ignitions until 11 a.m.  Avoid ignitions within 20 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.



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

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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