SMI Northeast (Smoke Management Instructions) Northeast Oregon Smoke Management Instructions

[ODF Smoke Management Instructions]

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS

SALEM FORESTRY WEATHER CENTER

OREGON DEPARTMENT OF FORESTRY



ISSUED: Thursday, May 20, 2010       2:35 PM      Pete Parsons



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


FRIDAY

A cold upper-level trough will remain over the entire Pacific Northwest.  Another cold front will bring increasing showers in the afternoon along with a chance of thunderstorms.  Maximum temperatures will be 10-15 degrees below normal with accumulating snow at elevations above 4500 feet.  High mixing heights will make for good smoke dispersal conditions.

    OUTLOOK (SATURDAY-MONDAY)

An unseasonably cold upper-level trough will set up camp over Oregon Saturday with numerous showers across central and northeastern Oregon.  There is also a chance of thunderstorms.  Elevations above about 4000 feet may get fresh snow accumulations.  The trough will slowly push east Sunday and Monday with a progressively drier, more stable, and warmer northwesterly flow aloft. Temperatures will remain well below normal, with the snow level only lifting to around 6000 feet by Monday.  Showers will taper off, from west to east, by Monday night.  Cool air aloft will maintain high afternoon mixing heights, for good daytime smoke dispersal conditions, after early morning inversions.


2.  DISPERSION



FRIDAY



Zone 630 and 632:

Mixing height 3500 - 4500 ft during the morning.  Mixing height rises to above 5000 ft during the afternoon then lowers to 2000 - 3000 ft during the evening.



Transport wind SSW to WSW at 10 - 18 mph during the morning.  Transport wind shifts to WSW to WNW and increases to 15 - 25 mph during the afternoon and evening.



Surface wind SW to W at 4 - 8 mph during the morning.  Surface wind increases to WSW to WNW at 9 - 15 mph during the afternoon then decreases to W to NW at 6 - 10 mph during the evening.



Zone 633 - 638:

Mixing height 3500 - 4500 ft during the morning.  Mixing height rises to above 5000 ft during the afternoon then lowers to 1500 - 2500 ft during the evening.



Transport wind WSW to WNW at 4 - 8 mph during the morning.  Transport wind increases to WNW to NW at 8 - 12 mph during the afternoon and evening.



Surface wind WSW to WNW at 4 - 8 mph during the morning.  Surface wind increases to WNW to NNW at 8 - 12 mph during the afternoon then decreases to WNW to NNW at 4 - 8 mph during the evening.



OUTLOOK:



SATURDAY

Mixing height 2200 to 3200 ft during the morning rising to 4200 to 5000 ft during the afternoon.  Transport wind WNW to NW at 10 - 22 mph.  Surface wind WNW to NW at 8 - 14 mph.



SUNDAY

Mixing height below 1000 ft early rising to 3000 to 4000 ft by late morning rising to 4500 to 5000 ft during the afternoon.  Transport wind NNW to NNE at 10 - 20 mph.  Surface wind NNW to NNE at 8 - 12 mph.



MONDAY

Mixing height below 1000 ft early rising to 3500 to 4500 ft by late morning and through the afternoon.  Transport wind WNW to NNW at 10 - 16 mph.  Surface wind WNW to NNW at 5 - 9 mph.



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 Friday, May 21, 2010.

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



Zone 630 and 632:

Avoid ignitions within 10 miles to the SSW through WNW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 15 miles to the SSW through WNW in or near drainages leading to SSRAs.  Watch for shifting transport winds.



Zone 633 - 638:

Avoid ignitions within 12 miles to the WSW through NNW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 20 miles to the WSW through NNW in or near drainages leading to SSRAs.  Verify transport winds away from SSRAs if burning in any other direction.  Complete ignitions by 5 p.m.



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

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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