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: Thursday, May 27, 2010       2:40 PM      Pete Parsons



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


    FRIDAY

The upper-level trough axis is forecast to move over south-central Oregon Friday morning, before shifting into Idaho Friday evening.  That will maintain considerable shower activity with increasing northwesterly winds ushering drier air, from west to east, across the region during the afternoon and evening.  Maximum temperatures will remain well below normal with a 5-6000 foot snow level.  Cool air aloft will maintain good daytime smoke dispersal conditions.

    OUTLOOK (SATURDAY-MONDAY)

A transitory and weak upper-level ridge is forecast to bring partly cloudy skies Saturday and Sunday with clearing skies leading to chilly overnight periods with low-level inversions trapping residual smoke near the ground.  Daytime smoke dispersal conditions will be fair to good with maximum temperatures recovering close to normal by Sunday.  The flow aloft will turn southwesterly Monday with fair to good smoke dispersal conditions but also increasing clouds.  A slight chance of rain will return by Monday afternoon, mainly north.


2.  DISPERSION



FRIDAY

Mixing height below 1500 ft early rising to 4000 - 5000 ft by late morning.  Afternoon mixing height rises above 5000 ft then lowers to 2000 - 3000 ft during the evening.



Transport wind NW to N at 8 - 12 mph during the morning.  Transport wind increases to NW to N at 13 - 25 mph during the afternoon then decreases to NW to N at 10 - 20 mph during the evening.



Surface wind NW to NNE at 6 - 12 mph during the morning.  Surface wind increases to NNW to NNE at 10 - 20 mph during the afternoon and evening.



OUTLOOK:



SATURDAY

Mixing height below 1000 ft early rising to 3500 - 4500 ft by late morning rising above 5000 ft during the afternoon.  Transport wind NNW to NNE at 8 - 12 mph.  Surface wind light and variable during the morning becoming NNW to NE at 6 - 10 mph during the afternoon.



SUNDAY

Mixing height below 1000 ft early rising to 3500 - 4500 ft by late morning rising above 5000 ft during the afternoon.  Transport wind SSE to SSW at 4 - 8 mph during the morning becoming SW to W at 5 - 9 mph during the afternoon.  Surface wind light and variable during the morning becoming WSW to WNW at 4 - 8 mph during the afternoon.



MONDAY

Mixing height below 1000 ft early rising to 4500 - 5000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind S to SW at 6 - 10 mph during the morning becoming WSW to WNW at 10 - 18 mph during the afternoon.  Surface wind SSW to WSW at 4 - 8 mph during the morning becoming WSW to WNW at 9 - 15 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 Friday, May 28, 2010.

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Avoid ignitions within 10 miles to the NW through N of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 15 miles to the NW through NNE in or near drainages leading to SSRAs.



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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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