SMI South Central (Smoke Management Instructions) (no subject)

[ODF Smoke Management Instructions]

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS

SALEM FORESTRY WEATHER CENTER

OREGON DEPARTMENT OF FORESTRY



ISSUED: Sunday, October 24, 2010       2:40 PM      Jim Little



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




    MONDAY
A 180 mph jet stream remains aimed directly at Oregon on Monday.  Sunday's wet and windy storm will be well to the east of the region, but showers and possible thunderstorms will linger.  Cool air aloft will allow for high mixing heights and good smoke dispersal conditions most areas.  Snow level will be about 4500 feet.
    EXTENDED OUTLOOK (TUESDAY - THURSDAY)
The upper level jet slackens and drops southward while weak high pressure aloft begins to build over the eastern Pacific on Wednesday.  There will still be a few scattered showers.  Mixing heights will remain high most areas.   By Wednesday the upper level ridge moves over the Pacific Northwest and an upper low develops about 450 miles west of the Washington Coast.  Low level flow goes south or south-southeasterly.  Subsidence aloft (sinking air motion) suppresses maximum mixing heights but smoke dispersal conditions will remain fair to good most areas.  On Thursday the center of the upper low moves to within about 250 miles of the northern Oregon Coast.  Upper flow becomes southwesterly over the region.  A Pacific weather system moves into Washington and Oregon during the day.  Rain reaches the area by mid-day



2.  DISPERSION



MONDAY

Mixing height 2600 - 3600 ft during the morning.  Afternoon mixing height rises to 3500 - 4500 ft then lowers to 2700 - 3700 ft during the evening.



Transport wind WSW to WNW at 15 - 25 mph.



Surface wind WSW to WNW at 10 - 22 mph during the morning and afternoon.  Surface wind decreases to WSW to WNW at 8 - 14 mph during the evening.



OUTLOOK:



TUESDAY

Mixing height 4100 - 5000 ft during the morning and through the afternoon.  Transport wind WSW to W at 18 - 32 mph during the morning becoming WNW to NW at 15 - 25 mph during the afternoon.  Surface wind SW to W at 10 - 20 mph during the morning becoming W to NW at 10 - 18 mph during the afternoon.



WEDNESDAY

Mixing height below 1000 ft early rising to 1500 - 2500 ft by late morning rising to 2600 - 3600 ft during the afternoon.  Transport wind light and variable during the morning becoming SSE to SSW at 6 - 10 mph during the afternoon.  Surface wind light and variable.



THURSDAY

Mixing height below 1000 ft early rising to 1000 - 2000 ft by late morning rising to 3500 - 4500 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.



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

    RANGE PORTION OF ZONE 624

This instruction is valid for burning conducted on Monday, October 25, 2010.

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Avoid ignitions within 12 miles to the WSW through WNW of SSRAs.  Care needed in selecting units as smoke will likely fumigate along the ground in wind prone areas.  No additional restrictions necessary.



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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

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