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, April 24, 2010       2:40 PM      Nick Yonker

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

Upper level trough will move by to the east tonight and give way to a ridge on Sunday.  Surface high pressure will build in as well and calm the winds overnight.  Air mass stabilizes as warming air moves in aloft.  Expect mostly sunny skies and warm temperatures during the afternoon after a frosty morning.  With weak wind flow and stabilizing air mass, smoke dispersion will be mostly poor to fair.

    OUTLOOK (MONDAY - WEDNESDAY):

Upper level ridge slips by to the east Monday morning as the next frontal system and major upper level trough move into the state.  Cold front will bring rain into the region late Monday afternoon and spread eastward through the evening.  Wind flow will increase markedly from the south, bringing greatly improved smoke dispersion.  Front will move through on Tuesday morning as a cold, upper level trough settles over the area Tuesday afternoon and Wednesday.  Expect plenty of showers and possible thundershowers under the chilly air mass.  Air mass destabilizes Monday and remains unstable through the remainder of the period, providing good to excellent smoke dispersion.

2.  DISPERSION

SUNDAY
Mixing height below 1000 ft early rising to 2800 - 3800 ft by late morning.  Afternoon mixing height rises above 5000 ft then lowers below 1000 ft during the evening.

Transport wind light and variable and controlled by local terrain.  Transport wind increases to SSE to SSW at 6 - 10 mph during the evening.

Surface wind light and variable and controlled by local terrain.

OUTLOOK:

MONDAY
Mixing height 2700 - 3700 ft during the morning rising above 5000 ft during the afternoon.  Transport wind S to SSW at 12 - 24 mph during the morning becoming SSW to SW at 22 - 40 mph during the afternoon.  Surface wind S to SSW at 9 - 15 mph during the morning becoming SSW to SW at 14 - 28 mph during the afternoon.

TUESDAY
Mixing height 2800 - 3800 ft during the morning rising above 5000 ft during the afternoon.  Transport wind SW to W at 15 - 30 mph.  Surface wind WSW to WNW at 12 - 22 mph.

WEDNESDAY
Mixing height 4500 - 5000 ft during the morning rising above 5000 ft during the afternoon.  Transport wind WSW to WNW at 10 - 20 mph.  Surface wind SW to W at 10 - 16 mph during the morning becoming W to NW at 10 - 16 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, April 25, 2010.
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Avoid ignitions within 15 miles in all directions of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 30 miles in all directions of 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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