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: Saturday, May 22, 2010       2:35 PM      Pete Parsons



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


SUNDAY

An unseasonably cold upper-level trough will remain over the region with mostly cloudy skies, scattered showers, and a chance of afternoon thunderstorms.  Maximum temperatures will warm several degrees, relative to Saturday, but remain well below normal.  The snow level will range from 4000 feet in the morning to 5-6000 feet in the afternoon.  The upper-lever trough will begin pushing east of the region by evening with the flow aloft drying and turning northwesterly.  High afternoon mixing heights will make for good daytime smoke dispersal conditions.

    OUTLOOK (MONDAY-WEDNESDAY)


The upper-level trough will push east of the region Monday with a much drier west-northwesterly flow aloft over northeastern Oregon by Monday afternoon.  Partial clearing and decreasing winds will allow some morning low-level temperature inversions to form, so residual smoke may be trapped near the ground.  High afternoon mixing heights will provide good daytime smoke dispersal conditions with increasing onshore transport winds.  Clearing skies Monday evening will quickly drop mixing heights and could trap residual smoke near the surface.  After a chilly morning, a strong southwesterly jet stream is forecast to direct another cold front onshore Tuesday with clouds increasing Tuesday afternoon and showers spreading back into northeastern Oregon by Tuesday evening.  Another upper-level trough will bring showers to the region Wednesday with snow levels around 6000 feet. High mixing heights and brisk transport winds should make for good smoke dispersal conditions.



2.  DISPERSION



SUNDAY

Mixing height below 2000 ft early rising to 3500 - 4500 ft by late morning.  Afternoon mixing height rises above 5000 ft then lowers to 1500 - 2500 ft during the evening.



Transport wind WNW to NNW at 7 - 11 mph.



Surface wind NW to N at 4 - 8 mph during the morning and afternoon.  Surface wind becomes light and variable and controlled by local terrain during the evening.



OUTLOOK:



MONDAY

Mixing height below 1000 ft early rising to 3500 to 4500 ft by late morning rising above 5000 ft during the afternoon.  Transport wind SW to WNW at 4 - 8 mph.  Surface wind light and variable during the morning becoming WSW to WNW at 4 - 8 mph during the afternoon.



TUESDAY

Mixing height below 1000 ft early rising to 3000 to 4000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind SSE to SSW at 12 - 24 mph.  Surface wind SE to S at 9 - 15 mph during the morning becoming SSW to WSW at 10 - 20 mph during the afternoon.



WEDNESDAY

Mixing height 2000 to 3000 ft during the morning rising above 5000 ft during the afternoon.  Transport wind SSE to SSW at 10 - 18 mph during the morning becoming SSW to WSW at 8 - 12 mph during the afternoon.  Surface wind S to SW at 8 - 12 mph during the morning becoming SW to WSW at 8 - 12 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 Sunday, May 23, 2010.

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



Avoid ignitions within 12 miles to the WNW through NNE of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 20 miles to the WSW through NNE in or near drainages leading to SSRAs.  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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