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, May 20, 2011       2:40 PM      Pete Parsons



Please Note:  A forecaster will be on duty this weekend.



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


SATURDAY

A weak upper-level trough is forecast to come onshore in the early morning.  An associated cold front will bring increasing clouds along with a chance of showers.  There is also a slight chance of an afternoon thunderstorm.  More clouds and increasing onshore northwesterly winds will drop afternoon temperatures back below normal.  Daytime mixing will be good.

OUTLOOK (SUNDAY-TUESDAY)

A moderately strong upper-level trough is forecast to bring mostly cloudy skies and a chance of showers Sunday and Monday.  Temperatures will cool to about 5-10 degrees below average.  Daytime mixing should be good with brisk northwesterly transport winds.

The upper-level trough is forecast to weaken by Tuesday, as it moves off to the east.  A cool but drier northwesterly flow aloft will slowly clear skies, with high temperatures edging up close to normal. Daytime mixing will remain good but with slackening transport winds.



2.  DISPERSION



SATURDAY

Mixing height below 500 ft early rising to 3500 - 4500 ft by late morning.  Afternoon mixing height rises above 5000 ft then lowers to 2000 - 3000 ft during the evening.



Transport wind WNW to NNW at 4 - 8 mph during the morning.  Transport wind increases to WNW to NNW at 9 - 15 mph during the afternoon and evening.



Surface wind W to NW at 4 - 8 mph during the morning.  Surface wind increases to WNW to NNW at 8 - 12 mph during the afternoon then decreases to WNW to NNW at 4 - 8 mph during the evening.



OUTLOOK:



SUNDAY

Mixing height below 1000 ft early rising to 3000 - 4000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming WNW to NNW at 6 - 10 mph during the afternoon.  Surface wind light and variable during the morning becoming WNW to NNW at 6 - 10 mph during the afternoon.



MONDAY

Mixing height below 1000 ft early rising to 3500 - 4500 ft by late morning rising above 5000 ft during the afternoon.  Transport wind NW to N at 5 - 9 mph during the morning becoming NW to NNW at 9 - 15 mph during the afternoon.  Surface wind NW to N at 4 - 8 mph.



TUESDAY

Mixing height below 1000 ft early rising to 3000 - 4000 ft by late morning rising above 5000 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, May 21, 2011.

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Avoid ignitions within 10 miles to the WNW through NNW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 15 miles to the WNW through NNW in or near drainages leading to SSRAs.  Verify transport winds away from SSRAs if burning in any other direction.



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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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