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: Tuesday, October 26, 2010       2:40 PM      Jim Little



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




    WEDNESDAY
A ridge of high pressure in the upper atmosphere covers the Pacific Northwest on Wednesday but an upper level low is also intensifying about 450 miles west of Brookings.  Skies will be mostly sunny and transport winds will be generally southwesterly through southeasterly.  Maximum mixing heights will be in the 3000 to 4000 foot range for fair smoke dispersal conditions
    EXTENDED OUTLOOK (THURSDAY - SATURDAY)
The upper level low moves to about 400 miles west of San Francisco on Thursday.  Upper flow over Oregon backs to southwesterly. Warm air aloft keeps mixing heights suppressed for just fair smoke dispersal conditions.  On Friday the upper level low drops southward to off the southern California coast.  Maximum mixing heights should reach 4000 to 4500 feet for improving smoke dispersal conditions.  Look for dry weather under mostly sunny skies.  Smoke dispersal conditions remain marginal.  On Saturday the upper low opens up and moves northeast as a weak upper level trough.  Smoke dispersal conditions will further improve and the southerly transport winds of Friday will continue.



2.  DISPERSION



WEDNESDAY

Mixing height below 1000 ft early rising to 1500 - 2500 ft by late morning.  Afternoon mixing height rising to 2700 - 3700 ft and remaining the same through the evening.



Transport wind SSE to S at 14 - 28 mph during the morning and afternoon.  Transport wind increases to SSE to SSW at 22 - 38 mph during the evening.



Surface wind SE to S at 12 - 22 mph.



OUTLOOK:



THURSDAY

Mixing height 2500 - 3500 ft during the morning and through the afternoon.  Transport wind SSW to SSW at 20 - 36 mph during the morning becoming SSW to SW at 14 - 28 mph during the afternoon.  Surface wind S to SW at 10 - 18 mph.



FRIDAY

Mixing height below 1000 ft early rising to 2000 - 3000 ft by late morning rising to 3700 - 4700 ft during the afternoon.  Transport wind light and variable during the morning becoming SE to SSW at 4 - 8 mph during the afternoon.  Surface wind light and variable.



SATURDAY

Mixing height 2000 - 3000 ft during the morning rising to 4000 - 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming SSE to SSW at 5 - 9 mph during the afternoon.  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 Wednesday, October 27, 2010.

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Delay ignitions until 10:00am.  Avoid ignitions within 15 miles to the SSE through SSW of SSRAs.  Care needed in selecting units as smoke will likely fumigate along the ground in wind prone areas.



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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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