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 6, 2010       2:35 PM      Pete Parsons



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


FRIDAY
Clearing skies and light winds will lead to unseasonably cold early morning surface temperatures and inversions.  A weak upper-level disturbance, in a westerly flow aloft, is forecast to move onshore in the afternoon.  It will only be strong enough to produce widely scattered mountain showers in the late afternoon.  Mixing should be good with a southerly component to the transport winds.

    OUTLOOK (SATURDAY-MONDAY)
The weak upper-level trough will move over the region Saturday morning.  That will force the surface thermal trough into northeastern Oregon with transport winds becoming light.  The couplet will continue east Saturday afternoon with good mixing and northwesterly transport winds. Skies should mostly be partly cloudy with near normal temperatures and very limited mountain shower activity.  Another upper-level trough will turn the flow aloft southwesterly Sunday with an increasing chance of showers, mainly across the southern districts.  Afternoon smoke dispersion should be good with more northerly transport winds.  A stronger system will likely bring much cooler and showery weather Monday with snow levels dropping to near 5000 feet.


2.  DISPERSION



FRIDAY

Mixing height below 1000 ft early rising to 3200 - 4200 ft by late morning.  Afternoon mixing height rises above 5000 ft then lowers to 2500 - 3500 ft during the evening.



Transport wind SSE to SSW at 6 - 10 mph.



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



OUTLOOK:



SATURDAY

In the west mixing height below 1000 ft early rising above 5000 ft by late morning and through the afternoon.  In the east mixing height 2800 to 3800 ft during the morning rising above 5000 ft during the afternoon.  Transport wind WSW to NW at 5 - 9 mph during the morning becoming NNW to NNE at 6 - 12 mph during the afternoon.  Surface wind WSW to NW at 5 - 7 mph during the morning becoming NNW to NNE at 6 - 12 mph during the afternoon.



SUNDAY

Mixing height below 1000 ft early rising above 5000 ft by late morning and through the afternoon.  Transport wind NNW to NNE at 6 - 10 mph during the morning becoming NW to N at 10 - 18 mph during the afternoon.  Surface wind NW to NNE at 4 - 8 mph.



MONDAY

Mixing height 2000 to 3000 ft during the morning rising above 5000 ft during the afternoon.  Transport wind WNW to NW at 8 - 12 mph during the morning becoming NW to NNW at 15 - 25 mph during the afternoon.  Surface wind WNW to NNW at 8 - 12 mph during the morning becoming NW to NNW at 10 - 20 mph during the afternoon.



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 7, 2010.

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



Avoid ignitions within 12 miles to the ESE through SW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 20 miles to the ESE through W 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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