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: Wednesday, May 26, 2010       2:40 PM      Pete Parsons



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


    THURSDAY

A strong upper-level trough will remain over the region with the center of circulation just off the northern California coastline.  That will maintain a moist and unstable southerly flow aloft over Oregon with numerous showers.  Cool air aloft should allow for high mixing heights and good smoke dispersal conditions but may also lead to afternoon and evening thunderstorm development.  Maximum temperatures will remain well below normal.  The snow level will stay in the 5-6000 feet range.

    OUTLOOK (FRIDAY-SUNDAY)

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 the snow level staying between 5500 and 6500 feet.  Cool air aloft will maintain good daytime smoke dispersal conditions.  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 inversions forming.  Daytime smoke dispersal conditions will be fair to good with maximum temperatures recovering close to normal by Sunday.


2.  DISPERSION



THURSDAY

Mixing height below 1000 ft early rising to 3700 - 4700 ft by late morning.  Afternoon mixing height rises above 5000 ft then lowers to 1000 - 2000 ft during the evening.



Transport wind SSE to SSW at 8 - 12 mph.



Surface wind SSE to SSW at 6 - 10 mph.



OUTLOOK:



FRIDAY

Mixing height below 1000 ft early rising above 5000 ft by late morning and through the afternoon.  Transport wind W to NW at 8 - 14 mph during the morning becoming WNW to NW at 10 - 22 mph during the afternoon.  Surface wind light and variable during the morning becoming WNW to NNW at 9 - 15 mph during the afternoon.



SATURDAY

Mixing height 2500 - 3500 ft during the morning rising above 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming NW to N at 5 - 9 mph during the afternoon.  Surface wind light and variable during the morning becoming NNW to NNE at 4 - 8 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 WSW to WNW at 6 - 12 mph during the afternoon.  Surface wind light and variable during the morning becoming WSW to NW at 6 - 10 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 Thursday, May 27, 2010.

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Avoid ignitions within 12 miles to the SSE through W of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 20 miles to the SSE through WNW in or near drainages leading to SSRAs.  Complete ignitions by 5 p.m.



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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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