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: Wednesday, September 22, 2010       2:40 PM      Jim Little



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



    THURSDAY



A weak upper disturbance moves into British Columbia during the day.  This will support a weak Pacific cold front dragging into northwest Oregon during the day.  Any rain from this system will be confined to extreme northwestern Oregon and dry weather is expected for south central portions of the state.  Winds will be southwesterly, becoming westerly during the day.  Smoke dispersal conditions will be good.





    OUTLOOK (FRIDAY-SUNDAY)



An upper level low settles into the Gulf of Alaska about 600 miles west of the Queen Charlotte Islands on Friday. Southwesterly flow aloft ahead of this system pumps up a ridge for the region.  This will give dry weather and mostly sunny skies to the area.  Winds under the ridge will be light (generally southerly becoming northwesterly) but mixing heights should remain high. Saturday will see the ridge drift slightly east and the flow aloft will be more southerly but smoke dispersal conditions will remain good with slightly stronger transport winds.  Sunday the ridge moves farther east the flow aloft will be more southwesterly and smoke dispersal conditions will remain good.





2.  DISPERSION



THURSDAY

Mixing height 3100 - 4100 ft during the morning.  Mixing height rises above 5000 ft during the afternoon then lowers below 1000 ft during the evening.



Transport wind SSW to WSW at 10 - 18 mph.



Surface wind SSW to WSW at 9 - 15 mph during the morning and afternoon.  Surface wind decreases to WSW to WNW at 4 - 8 mph during the evening.



OUTLOOK:



FRIDAY

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



SATURDAY

Mixing height below 1000 ft early rising to 2500 - 3500 ft by late morning rising above 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming WSW to NW at 4 - 8 mph during the afternoon.  Surface wind light and variable.



SUNDAY

Mixing height below 1000 ft early rising to 2000 - 3000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind ESE to SSE at 4 - 8 mph during the morning becoming WNW to NNW at 4 - 8 mph during the afternoon.  Surface wind SE to SSW at 4 - 8 mph during the morning becoming WNW to NNW at 4 - 8 mph during the afternoon.



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

    RANGE PORTION OF ZONE 624

This instruction is valid for burning conducted on Thursday, September 23, 2010.

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Avoid ignitions within 15 miles to the SSW through NW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 30 miles to the S through NW in or near drainages leading to SSRAs.  Recommend against burning units that will smolder significantly overnight.  Complete ignitions by 4:00pm.



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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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