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: Tuesday, September 28, 2010       2:35 PM      Jim Little



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


WEDNESDAY
In the upper atmosphere a ridge covers the Pacific Northwest for Wednesday.  The ridge is centered to the south with a generally west to east flow aloft over the region.  Warm air aloft with this ridge will produce very stable conditions and mixing heights will be quite low.  Smoke dispersal conditions will be only fair.  Winds will be generally northeasterly across the area.
    EXTENDED OUTLOOK (THURSDAY - SATURDAY)
An upper level disturbance moves SW to NE offshore toward southwestern British Columbia on Thursday.  A surface thermal trough will extend from central California into SW Oregon.  Low mixing heights will continue and winds will be generally NE for the region.  On Friday the upper ridge retreats slightly eastward and the thermal trough shifts eastward as well.  Transport winds will become southerly.  Mixing heights remain suppressed.  The upper ridge flattens Saturday and somewhat cooler air aloft will allow mixing heights to improve.



2.  DISPERSION



WEDNESDAY



Zone 630 and 632:

Mixing height 1600 - 2600 ft during the morning.  Afternoon mixing height rises to 3000 - 4000 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 N to NE at 6 - 10 mph during the afternoon and evening.



Surface wind light and variable and controlled by local terrain during the morning.  Surface wind increases to N to NE at 6 - 10 mph during the afternoon then becomes light and variable during the evening.



Zone 633 - 638:

Mixing height 1900 - 2900 ft during the morning.  Afternoon mixing height rises to 3000 - 4000 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 N to NE at 5 - 9 mph during the afternoon then shifts to ENE to ESE at 4 - 8 mph during the evening.



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



OUTLOOK:



THURSDAY

Mixing height below 1000 ft early rising to 1800 to 2800 ft by late morning rising to 3000 to 4000 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.



FRIDAY

Mixing height below 1000 ft early rising to 2000 to 3000 ft by late morning rising to 2700 to 3700 ft during the afternoon.  Transport wind SE to SSW at 4 - 8 mph during the morning becoming SSW to WSW at 4 - 8 mph during the afternoon.  Surface wind light and variable.



SATURDAY

Mixing height below 1000 ft early rising to 1500 to 2500 ft by late morning rising to 4000 to 5000 ft during the afternoon.  Transport wind ESE to S at 4 - 8 mph during the morning becoming light and variable during the afternoon.  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 Wednesday, September 29, 2010.

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



Zone 630 and 632:

Avoid ignitions within 15 miles to the N through SSE of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 30 miles to the N through SSE in or near drainages leading to SSRAs.  Recommend against burning units that will smolder significantly overnight.  Complete ignitions by 4:00pm.



Zone 633 - 638:

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 4:00pm.



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

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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