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, October 11, 2010       2:40 PM      Jim Little



1.  DISCUSSION AND FORECAST FOR SOUTH CENTRAL OREGON ZONES 624 AND 625
    TUESDAY
A broad ridge in the upper atmosphere covers the region on Tuesday.  This ridge extends from a high centered just off the northern California coast.  Subsidence aloft will cap mixing heights at around 3000 feet and transport winds will be very light.  The light winds mean burns should be planned for locations well away from SSRA's.
    EXTENDED OUTLOOK (WEDNESDAY - FRIDAY)
The upper ridge drifts east and by Wednesday its axis will lie on a line from Nevada to Alberta.  Continued subsidence will keep mixing heights low and smoke dispersal conditions will be marginal.  By Thursday the upper ridge moves east and an upper trough in the Gulf of Alaska turns flow aloft to southwesterly.  Mixing heights should improve most areas and smoke dispersal conditions will improve to fair.  Friday will see dry weather, light southwesterly transport winds, and good smoke dispersal conditions.



2.  DISPERSION



TUESDAY

Mixing height 1400 - 2400 ft during the morning.  Afternoon mixing height lowers to 1000 - 1000 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 E to SE at 5 - 9 mph during the afternoon and evening.



Surface wind light and variable and controlled by local terrain during the morning.  Surface wind increases to E to SE at 5 - 9 mph during the afternoon then becomes light and variable during the evening.



OUTLOOK:



WEDNESDAY

Mixing height below 1000 ft early rising to 2500 - 3500 ft by late morning rising to 4000 - 5000 ft during the afternoon.  Transport wind SE to S at 8 - 14 mph during the morning becoming SSW to WSW at 10 - 16 mph during the afternoon.  Surface wind SSE to SSW at 6 - 10 mph during the morning becoming SSW to WSW at 8 - 12 mph during the afternoon.



THURSDAY

Mixing height below 1000 ft early rising to 1000 - 2000 ft by late morning rising to 4500 - 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming S to SW at 4 - 8 mph during the afternoon.  Surface wind light and variable during the morning becoming S to SW at 4 - 8 mph during the afternoon.



FRIDAY

Mixing height below 1000 ft early rising to 1000 - 1900 ft by late morning rising to 4500 - 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming W to NW at 6 - 12 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 Tuesday, October 12, 2010.

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



Unfavorable burning situation due to very poor smoke dispersion.  Delay ignitions until 10:00am.  Avoid ignitions within 20 miles to the ENE through SSE of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 35 miles to the ENE through S in or near drainages leading to SSRAs.  Verify transport winds away from SSRAs if burning in any other direction.  Recommend against burning units that will smolder significantly overnight.  Complete ignitions by 3:30am.



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

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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