SMI Northeast (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       2:35 PM      Jim Little



1.  DISCUSSION AND FORECAST FOR NORTHEAST FORECAST AREA ZONES 630-638



    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 4000-5000 feet.  Transport winds will be generally south-southwesterly, becoming west or northwesterly 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



Zone 630 and 632:

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.  Transport wind increases to NE to E at 5 - 9 mph during the evening.



Surface wind light and variable and controlled by local terrain.

Zone 633 - 638:

Mixing height 4300 - 5000 ft during the morning.  Mixing height rises above 5000 ft during the afternoon then lowers below 1000 ft during the evening.



Transport wind WSW to NW at 6 - 10 mph during the morning.  Transport wind becomes light and variable and controlled by local terrain during the afternoon and evening.



Surface wind W to NW at 6 - 10 mph during the morning.  Surface wind becomes light and variable and controlled by local terrain during the afternoon and evening.



OUTLOOK:



WEDNESDAY

In the west mixing height 3400 to 4400 ft during the morning rising above 5000 ft during the afternoon.  In the east mixing height 4200 to 5000 ft during the morning rising above 5000 ft during the afternoon.  Transport wind SSE to SSW at 10 - 20 mph during the morning becoming WSW to WNW at 8 - 14 mph during the afternoon.  Surface wind SSE to SSW at 6 - 12 mph during the morning becoming WSW to NW at 6 - 10 mph during the afternoon.



THURSDAY

Mixing height 2800 to 3800 ft during the morning rising above 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming WNW to NNW at 4 - 8 mph during the afternoon.  Surface wind light and variable.



FRIDAY

Mixing height below 1000 ft early rising to 4000 to 5000 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 NORTHEAST OREGON ZONES 630-638

    The following considerations should be adhered to in addition to

    the requirements of the Oregon Smoke Management Plan. These

    Instructions are valid for burning conducted on Tuesday, April 19, 2011.

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



Zone 630 and 632:

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



Zone 633 - 638:

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. Please call this number and not individual's

    numbers to discuss daily burning.  For large burns (over

    2000 tons) or burns extending over a considerable period,

    please request a special forecast.  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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