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: Saturday, May 8, 2010       2:40 PM      Pete Parsons



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


    SUNDAY

A split-flow jet stream pattern will send another upper-level trough across mainly the southern two-thirds of Oregon.  Scattered showers are likely with the snow level dropping to around 5500 feet.  Mixing should be fair to good from the late morning through the afternoon with generally northwest to westerly transport winds.

   OUTLOOK (MONDAY-WEDNESDAY)

A strong upper-level trough will bring showery and cooler conditions on Monday.  Light snow accumulations are possible above 4-5000 feet.  Transport winds should take on more of a southerly component, Monday morning, possibly shifting to westerly late in the day. A northerly flow aloft is forecast on Tuesday, as an upper-level ridge builds just offshore.  That should taper off the shower activity with northwesterly transport winds likely turning more northerly by Tuesday evening.  Wednesday looks dry with transport winds becoming more easterly along with good mixing heights.


2.  DISPERSION



SUNDAY

Mixing height 3000 - 4000 ft during the morning.  Afternoon mixing height rises to 3500 - 4500 ft then lowers to 2700 - 3700 ft during the evening.



Transport wind WNW to NNW at 8 - 12 mph during the morning.  Transport wind increases to WSW to WNW at 10 - 20 mph during the afternoon and evening.



Surface wind light and variable and controlled by local terrain during the morning.  Surface wind increases to W to NW at 10 - 20 mph during the afternoon and evening.



OUTLOOK:



MONDAY

Mixing height below 1000 ft early rising to 2200 - 3200 ft by late morning rising above 5000 ft during the afternoon.  Transport wind S to SW at 10 - 20 mph during the morning becoming WSW to WNW at 10 - 20 mph during the afternoon.  Surface wind SSE to SSW at 6 - 10 mph during the morning becoming WSW to WNW at 10 - 20 mph during the afternoon.



TUESDAY

Mixing height 2200 - 3200 ft during the morning rising above 5000 ft during the afternoon.  Transport wind WNW to NNW at 10 - 16 mph.  Surface wind NNW to NNE at 6 - 10 mph.



WEDNESDAY

Mixing height below 1000 ft early rising to 4500 - 5000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind ENE to E at 8 - 12 mph during the morning becoming N to NE at 4 - 8 mph during the afternoon.  Surface wind NE to ESE at 4 - 8 mph during the morning becoming N to NE at 4 - 8 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 Sunday, May 9, 2010.

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Avoid ignitions within 12 miles to the WSW through NNW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 20 miles to the S through NNW 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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