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, October 24, 2009       2:40 PM      Nick Yonker

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

Upper level ridge will continue building over the state today and tonight, further stabilizing the air mass.  Next frontal system will override the ridge later Sunday as a warm front spreads clouds over the area during the day with light rain beginning during the evening and overnight.  Increasing wind flow from the southwest will slowly improve smoke dispersion.

    OUTLOOK (MONDAY - WEDNESDAY):

Ridge slides to the east early Monday giving way to the cold front and upper level trough.  Expect a fairly decent amount of moisture over the region.  Cooler air will move in aloft to destabilize the air mass and lower snow levels.  Upper trough moves by to the east Tuesday but with a strong northwesterly jet stream over the region, cool showers will continue with the snow level lowering to the valley floors.  Air mass will be quite unstable.  The next upper level ridge starts building in Wednesday but with chilly air remaining over the region, the air mass will remain mostly unstable.  However, decreasing wind will worsen smoke dispersion from the dispersion of Monday and Tuesday.

2.  DISPERSION

SUNDAY
Mixing height below 1000 ft early rising to 1500 - 2500 ft by late morning.  Afternoon mixing height rises to 2000 - 3000 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 SSW to SW at 10 - 16 mph during the afternoon and evening.

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

OUTLOOK:

MONDAY
Mixing height 1700 - 2700 ft during the morning rising above 5000 ft during the afternoon.  Transport wind SW to WSW at 14 - 28 mph during the morning becoming W to WNW at 20 - 35 mph during the afternoon.  Surface wind SSW to WSW at 10 - 16 mph during the morning becoming W to WNW at 15 - 25 mph during the afternoon.

TUESDAY
Mixing height 4500 - 5000 ft during the morning rising above 5000 ft during the afternoon.  Transport wind WNW to NW at 15 - 25 mph.  Surface wind WNW to NW at 9 - 15 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 WNW to NNW at 8 - 12 mph during the morning becoming light and variable during the afternoon.  Surface wind light and variable.

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, October 25, 2009.
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Delay ignitions until 10 a.m.  Avoid ignitions within 15 miles to the SE through WSW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 25 miles to the SE through W 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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