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: Friday, May 7, 2010       2:35 PM      Pete Parsons



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


SATURDAY
The unseasonably cold air mass, from earlier this week, has moderated, with temperatures returning to near normal.  Only brief morning inversions are likely, with good ventilation conditions from late morning through the afternoon.  The flow aloft will be westerly with a couple of upper-air disturbances possibly triggering a few showers, mainly over the mountains.  Northwest to northerly transport winds will increase in the afternoon, as the surface thermal trough shifts from central Oregon into Idaho.

   OUTLOOK (SUNDAY-TUESDAY)
Another upper-level trough will move across southern Oregon and northern California on Sunday.  Skies should be partly cloudy with just a chance of showers over mainly the most southern zones.  Mixing should be good from the late morning through the afternoon with northwest to northerly transport winds.  A cold upper-level trough will move over Oregon Monday with showery weather.  Snow levels will drop to near 5000 feet.  Showers will likely linger into Tuesday with a drier northerly flow aloft forecast by Tuesday afternoon.


2.  DISPERSION



SATURDAY

Mixing height below 1000 ft early rising above 5000 ft by late morning.  Mixing height lowers to 3000 - 4000 ft during the evening.



Transport wind NW to N at 6 - 10 mph.



Surface wind NW to NNE at 6 - 10 mph during the morning and afternoon.  Surface wind decreases to NNW to NE at 5 - 8 mph during the evening.



OUTLOOK:



SUNDAY

Mixing height below 1000 ft early rising above 5000 ft by late morning and through the afternoon.  Transport wind N to NE at 4 - 8 mph during the morning becoming NW to N at 6 - 12 mph during the afternoon.  Surface wind light and variable during the morning becoming NW to N at 6 - 10 mph during the afternoon.



MONDAY

Mixing height below 1000 ft early rising to 2500 to 3500 ft by late morning rising above 5000 ft during the afternoon.  Transport wind WNW to NNW at 8 - 12 mph during the morning becoming WNW to NW at 12 - 24 mph during the afternoon.  Surface wind NW to N at 8 - 12 mph during the morning becoming NW to NNW at 10 - 20 mph during the afternoon.



TUESDAY

Mixing height 2000 to 3000 ft during the morning rising above 5000 ft during the afternoon.  Transport wind NNW to N at 18 - 32 mph.  Surface wind NNW to NNE at 10 - 20 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 Saturday, May 8, 2010.

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



Avoid ignitions within 10 miles to the NW through NNE of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 15 miles to the NW through NE in or near drainages leading to SSRAs.  Verify transport winds away from SSRAs if burning in any other direction.



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

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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