SMI South Central (Smoke Management Instructions) South Central Smoke Management Instructions

[ODF Smoke Management Instructions]

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS

SALEM FORESTRY WEATHER CENTER

OREGON DEPARTMENT OF FORESTRY



ISSUED: Friday, April 23, 2010       2:40 PM      Nick Yonker



1.  DISCUSSION AND FORECAST FOR SOUTH CENTRAL OREGON ZONES 624 AND 625



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 may be strong enough to bring some showers to 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 into 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 showers Tuesday with the snow level dropping to 4000 feet Tuesday afternoon.  Smoke dispersion should be excellent.



2.  DISPERSION



SATURDAY

Mixing height below 3000 ft early rising above 5000 ft by late morning.  Mixing height lowers to 1000 - 2000 ft during the evening.



Transport wind WSW to WNW at 15 - 25 mph during the morning and afternoon.  Transport wind decreases to W to NW at 5 - 9 mph during the evening.



Surface wind WSW to WNW at 8 - 12 mph during the morning.  Surface wind increases to W to NW at 10 - 20 mph during the afternoon then decreases to W to NW at 5 - 9 mph during the evening.



OUTLOOK:



SUNDAY

Mixing height below 1000 ft early rising to 3200 - 4200 ft by late morning rising above 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming SE to SSW at 8 - 12 mph during the afternoon.  Surface wind light and variable during the morning becoming SW to WNW at 5 - 9 mph during the afternoon.



MONDAY

Mixing height below 1000 ft early rising to 3500 - 4500 ft by late morning and through the afternoon.  Transport wind SSE to SSW at 10 - 18 mph.  Surface wind SE to S at 6 - 12 mph.



TUESDAY

Mixing height 2800 - 3800 ft during the morning rising to 4500 - 5000 ft during the afternoon.  Transport wind S to SSW at 15 - 29 mph during the morning becoming W to WNW at 15 - 25 mph during the afternoon.  Surface wind WSW to WNW at 12 - 22 mph.



3.  BURNING INSTRUCTIONS FOR ZONES 624 AND 625 INCLUDING THE WALKER

    RANGE PORTION OF ZONE 624

This instruction is valid for burning conducted on Saturday, April 24, 2010.

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Avoid ignitions within 12 miles to the WSW through NW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 20 miles in all directions of SSRAs.



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4.  SPECIAL NOTE:



    The smoke management forecaster is available at (503)

    945-7401.  The smoke management forecaster is available

    to discuss specific burns.  The duty forecaster phone

    number is (503) 945-7401. Please call this number and

    not individual's numbers to discuss daily burning. Please

    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


Nick Yonker
Meteorology Manager
Oregon Department of Forestry
503-945-7451
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