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

Fri Apr 23 16:24:43 PDT 2010

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS

SALEM FORESTRY WEATHER CENTER

OREGON DEPARTMENT OF FORESTRY

ISSUED: Friday, April 23, 2010       2:35 PM      Nick Yonker

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

Northwesterly flow aloft will direct a weak cold front across southern British Columbia, Washington, and northern Oregon on Saturday.  The southern end of the front will likely be strong enough to bring some showers to mainly the northern zones with onshore surface flow. Smoke dispersion will be good to excellent.

OUTLOOK (SUNDAY - TUESDAY)

An upper-level ridge moves over Oregon Sunday for dry weather. Surface and transport winds rapidly decrease by Sunday morning...becoming variable and influenced by local terrain. Smoke dispersion will be poor in the early morning but become fair to good Sunday afternoon.  The flow aloft turns westerly Monday with a strong cold front forecast to spread rain, from west to east, across the region Monday afternoon and night.  Increasing southerly transport winds will make for fair to good smoke dispersion.  A cold upper-level trough will bring numerous showers Tuesday with the snow level dropping to 4000 feet in the afternoon.  Smoke dispersion should be excellent.

2.  DISPERSION

SATURDAY

Mixing heights below 3000 feet in the early morning, rising to 3500-4500 feet in the late-morning and above 5000 feet in the afternoon.

Transport wind WSW to WNW at 17 - 31 mph throughout the morning and afternoon.  Transport wind shifts to NNW to NNE and decreases to 6 - 10 mph during the evening.

Surface wind W to NW at 10 - 20 mph during the morning and afternoon.  Surface wind decreases to NW to NNE at 4 - 8 mph during the evening.

OUTLOOK:

SUNDAY

Mixing height below 1000 ft early rising to 3300 to 4300 ft by late morning rising above 5000 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.

MONDAY

Mixing height below 1000 ft early rising to 3000 to 4000 ft by late morning and through the afternoon.  Transport wind SE to S at 8 - 12 mph during the morning becoming SSE to SSW at 10 - 20 mph during the afternoon.  Surface wind ESE to S at 6 - 10 mph.

TUESDAY

Mixing height 2500 to 3500 ft during the morning rising to 4500 to 5000 ft during the afternoon.  Transport wind S to SSW at 18 - 32 mph during the morning becoming W to WNW at 15 - 25 mph during the afternoon.  Surface wind S to SSW at 15 - 25 mph during the morning becoming WNW to NW 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 Saturday, April 24, 2010.

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Avoid ignitions within 10 miles to the WSW through NNE of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 15 miles in all directions of SSRAs.  Watch for shifting transport winds.

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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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