SMI South Central (Smoke Management Instructions) South Central Smoke Management Instructions

ODF Smoke Management Instructions smi_south_central at listsmart.osl.state.or.us
Sat Apr 25 14:32:27 PDT 2009


SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS
SALEM FORESTRY WEATHER CENTER
OREGON DEPARTMENT OF FORESTRY

ISSUED: Saturday, April 25, 2009       2:40 PM      Nick Yonker

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

Dry cold front moved through early this morning to bring brisk westerly winds to the region this afternoon.  Cool, northerly air moving in aloft has made for good mixing.  Northerly flow will remain over the region tomorrow but temperatures will warm up a little more.  Expect mostly fair to good smoke dispersion.

    OUTLOOK (MONDAY - WEDNESDAY):

Next surge of northerly flow moves in Monday as an upper low drops southward out of Canada.  Upper low will move right over the state Tuesday kicking off showers over much of the area.  Low will remain over the area Wednesday but gradually weaken.  Scattered showers will continue.  Expect good to excellent mixing and smoke dispersion throughout the period.

2.  DISPERSION

SUNDAY
Mixing height below 1000 ft early rising to 3800 - 4800 ft by late morning.  Afternoon mixing height rises above 5000 ft then lowers below 1000 ft during the evening.

Transport wind NW to N at 5 - 9 mph.

Surface wind light and variable and controlled by local terrain during the morning.  Surface wind increases to NW to N at 6 - 10 mph during the afternoon then becomes light and variable during the evening.

OUTLOOK:

MONDAY
Mixing height below 1000 ft early rising to 3700 - 4700 ft by late morning rising above 5000 ft during the afternoon.  Transport wind SSE to SSW at 4 - 8 mph during the morning becoming W to NW at 10 - 18 mph during the afternoon.  Surface wind light and variable during the morning becoming W to NW at 9 - 15 mph during the afternoon.

TUESDAY
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.  Surface wind WNW to NNW at 4 - 8 mph.

WEDNESDAY
Mixing height 3200 - 4200 ft during the morning rising above 5000 ft during the afternoon.  Transport wind WNW to NNW at 8 - 12 mph.  Surface wind WNW to NNW at 6 - 12 mph.

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, April 26, 2009.
==================================================================

Avoid ignitions within 12 miles to the NW through NE of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 20 miles in all directions of SSRAs.  Verify transport winds away from SSRAs if burning in any other direction.

==============================================================
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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