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, October 29, 2010       2:40 PM      Pete Parsons



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



SATURDAY



The upper-level trough that was centered just off the California coast on Friday will weaken and slide inland across California and Nevada.  A moist southwesterly flow aloft will keep skies mostly cloudy over the region with a few areas of light rain possible.  Increasing southwesterly transport winds will maintain at least fair smoke dispersal conditions.


OUTLOOK (SUNDAY-TUESDAY)


A cold front is forecast to bring a good chance of showers to the region Saturday night and Sunday.  Rainfall totals should generally be around one-tenth of an inch or less.  Southwesterly transport winds will provide fair to good smoke dispersal conditions.  A building ridge of high pressure will clear skies and rapidly lower mixing heights Sunday evening.



More stagnant conditions are expected Monday and Tuesday with areas of morning low clouds and valley fog.  Snow levels will lift above 8000 feet.  Light south to southwesterly transport winds and suppressed mixing heights will likely provide only marginal afternoon smoke dispersal conditions on Monday.  Valley fog should become more widespread Tuesday, with possible persistent surface-based inversions.  Light southeasterly transport winds and low mixing heights will generally make for poor smoke dispersal conditions.  Some ridges could get above the low-level temperature inversions in the afternoon.



2.  DISPERSION



SATURDAY

Mixing height below 1500 ft early rising to 2400 - 3400 ft by late morning.  Afternoon mixing height rises to 3300 - 4300 ft then lowers to 2500 - 3500 ft during the evening.



Transport wind SSW to SW at 9 - 15 mph during the morning.  Transport wind increases to SSW to WSW at 15 - 25 mph during the afternoon and evening.



Surface wind S to SW at 4 - 8 mph during the morning.  Surface wind increases to SSW to SW at 8 - 12 mph during the afternoon and evening.



OUTLOOK:



SUNDAY

Mixing height 3500 - 4500 ft during the morning and through the afternoon.  Transport wind SW to WSW at 20 - 36 mph during the morning becoming SSW to WSW at 10 - 20 mph during the afternoon.  Surface wind S to SW at 10 - 18 mph during the morning becoming S to SW at 5 - 9 mph during the afternoon.



MONDAY

Mixing height below 1000 ft early rising to 1300 - 2300 ft by late morning and through the afternoon.  Transport wind SSE to SW at 6 - 10 mph.  Surface wind light and variable.



TUESDAY

Mixing height below 1000 ft during the morning rising to 1000 - 2000 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 Saturday, October 30, 2010.

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Avoid ignitions within 12 miles to the SSW through WSW of SSRAs.  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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