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 7, 2009       2:40 PM      Nick Yonker

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

Minor upper level ridge starts building into the state tonight through Friday.  Air mass will dry and warm slowly.  Expect clearing skies tonight and a mostly sunny day tomorrow.  Wind flow will turn northerly as surface high pressure starts building in.  Expect fair to good smoke dispersion.

    OUTLOOK (SATURDAY - MONDAY):

Upper level ridge continues to build over the region on Saturday and Sunday before shifting eastward Monday as an upper level trough and cold front approach.  Effects of the incoming front will be felt Sunday afternoon in the form of a marine push.  Air mass will stabilize further Saturday and Sunday under the ridge, then destabilize on Monday.  Smoke dispersion will be mostly fair Saturday and Sunday, then improve Monday.

2.  DISPERSION

FRIDAY
Mixing height below 1000 ft early rising to 3300 - 4300 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 during the morning.  Transport wind increases to NNW to NE at 5 - 9 mph during the afternoon and evening.

Surface wind light and variable and controlled by local terrain during the morning.  Surface wind increases to NW to NNE at 5 - 9 mph during the afternoon and evening.

OUTLOOK:

SATURDAY
Mixing height below 1000 ft early rising to 4000 - 5000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable during the morning becoming NW to N at 4 - 8 mph during the afternoon.

SUNDAY
Mixing height below 1000 ft early rising to 3000 - 4000 ft by late morning rising to 4000 - 5000 ft during the afternoon.  Transport wind SSW to WSW at 8 - 12 mph.  Surface wind SSW to WSW at 4 - 8 mph.

MONDAY
Mixing height below 1000 ft early rising to 3000 - 4000 ft by late morning rising to 4500 - 5000 ft during the afternoon.  Transport wind WSW to WNW at 12 - 24 mph.  Surface wind WSW to WNW at 9 - 15 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 Friday, May 8, 2009.
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Avoid ignitions within 12 miles to the NNW through ESE of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 20 miles to the NNW through ESE in or near drainages leading to SSRAs.  Verify transport winds away from SSRAs if burning in any other direction.  Recommend against burning units that will smolder significantly overnight.

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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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