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: Monday, April 18, 2011       2:40 PM      Jim Little



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



    TUESDAY



Upper level flow will be light west-northwesterly over the region on Tuesday with an upper level jet lying across the southern half of the state.  Moisture is limited but the air mass remains cold for this time of year.  This will produce high maximum mixing heights and good smoke dispersal conditions.



    OUTLOOK (WEDNESDAY - FRIDAY)



The upper level jet slips south by Wednesday keeping cool conditions aloft over the region.  Mixing heights will remain high for good smoke dispersal conditions.  A weak disturbance in the upper flow will produce precipitation with the snow level down to around 5000 feet.  Transport winds will be generally southwesterly, becoming west-southwesterly most areas late in the day.



By Thursday an upper level disturbance swings in from the northwest and phases with a weak disturbance coming across the Pacific to carve out a trough over the Pacific Northwest. This will produce light precipitation most areas.  The cool air mass will mean snow at higher elevations but also good smoke dispersal conditions.  On Friday expect weak ridging aloft for dry weather but light and variable transport winds.



2.  DISPERSION



TUESDAY

Mixing height above 5000 ft during the morning and afternoon.  Mixing height 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:



WEDNESDAY

Mixing height 2100 - 3100 ft during the morning rising above 5000 ft during the afternoon.  Transport wind SSW to SW at 12 - 24 mph during the morning becoming WSW to W at 10 - 22 mph during the afternoon.  Surface wind SSW to WSW at 6 - 12 mph during the morning becoming SW to W at 9 - 15 mph during the afternoon.



THURSDAY

Mixing height 1800 - 2800 ft during the morning rising above 5000 ft during the afternoon.  Transport wind S to SW at 4 - 8 mph during the morning becoming light and variable during the afternoon.  Surface wind light and variable.



FRIDAY

Mixing height below 1000 ft early rising to 3000 - 4000 ft by late morning rising above 5000 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 Tuesday, April 19, 2011.

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



Avoid ignitions within 12 miles in all directions of SSRAs.  No additional restrictions necessary.



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

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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