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: Wednesday, April 27, 2011       2:35 PM      Jim Little



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


    THURSDAY
An upper level trough on a northeast to southwest axis moves across the region on Thursday.  Models show areas of light rain or light snow at higher elevations.  Smoke dispersal conditions will be good most areas and transport winds will be generally west-southwesterly.
    EXTENDED OUTLOOK (FRIDAY - SUNDAY)
The upper trough moves east early and a ridge of high pressure is building to the west of Oregon on Friday, although the axis of that ridge will be several hundred miles to the west of the coastline.  Northeast Oregon can expect generally dry weather and good smoke dispersal conditions most areas. Transport winds will mostly be from the west-northwest.
Saturday the ridge builds and its axis moves to about 300 miles west of the coast.  Weather turns dry.  Maximum mixing heights remain high for good smoke dispersal conditions and transport winds will be mostly west through northwest.
A broad ridge in the upper atmosphere moves over the region on Sunday for fair weather.  Smoke dispersal conditions should be good and transport winds will be light, from the south-southwest becoming south-southeast during the day.

2.  DISPERSION



THURSDAY



Zone 630 and 632:

Mixing height above 5000 ft throughout the day.  Mixing height lowers to 1700 - 2700 ft during the evening.



Transport wind WSW to WNW at 8 - 14 mph during the morning.  Transport wind increases to WSW to WNW at 10 - 20 mph during the afternoon and evening.



Surface wind WSW to WNW at 8 - 12 mph during the morning.  Surface wind shifts to NW to NNW at 8 - 14 mph during the afternoon and evening.

Zone 633 - 638:



Transport wind WSW to WNW at 8 - 14 mph during the morning.  Transport wind decreases to WSW to WNW at 5 - 9 mph during the afternoon and evening.



Surface wind WSW to WNW at 8 - 14 mph during the morning.  Surface wind shifts to WNW to NNW and decreases to 4 - 8 mph during the afternoon and evening.





OUTLOOK:



FRIDAY

Mixing height 2300 to 3300 ft during the morning rising above 5000 ft during the afternoon.  Transport wind W to NW at 10 - 22 mph during the morning becoming NW to NNW at 16 - 26 mph during the afternoon.  Surface wind W to NW at 8 - 14 mph during the morning becoming NW to NNW at 10 - 22 mph during the afternoon.



SATURDAY

Mixing height below 1000 ft early rising to 3000 to 4000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.



SUNDAY

Mixing height below 1000 ft early rising to 3100 to 4100 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 Thursday, April 28, 2011.

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Zone 630 and 632:

Avoid ignitions within 10 miles to the WSW through NNW of SSRAs.  No additional restrictions necessary.



Zone 633 - 638:

Avoid ignitions within 12 miles to the SW through WNW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 12 miles to the SW through NW in or near drainages leading to SSRAs.  Verify transport winds away from SSRAs if burning in any other direction.  No additional restrictions necessary.  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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