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: Wednesday, October 28, 2009       2:40 PM      Nick Yonker

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

Upper level ridge continues to build over the state but is being overrun by clouds from a warm front off the coast.  This front will continue to pump clouds into the region through Thursday as it slowly moves in.  Little, if any, rain is likely.  Air mass will remain stable as warming air aloft continues to enhance the lower level temperature inversion.  Increasing wind flow from the south should provide fair smoke dispersion.

    OUTLOOK (FRIDAY - SUNDAY):

Upper ridge with warm front clouds continues through Friday before the ridge flattens and gives way to a cold front on Saturday.  Moisture amounts from the cold front will be light.  Air mass will destabilize Saturday for a brief period before stabilizing again Saturday night and Sunday as the upper ridge rebuilds again.  Wind flow will increase as the front moves through on Saturday, providing decent smoke dispersion.  Winds then decrease later Saturday and become quite light on Sunday, making for considerably poorer smoke dispersion.

2.  DISPERSION

THURSDAY
Mixing height below 1000 ft early rising to 2500 - 3500 ft by late morning.  Afternoon mixing height rises to 3000 - 4000 ft then lowers to 2000 - 3000 ft during the evening.

Transport wind SSW to W at 5 - 9 mph during the morning.  Transport wind increases to SW to W at 8 - 14 mph during the afternoon and increases to WSW to WNW at 10 - 20 mph during the evening.

Surface wind SSW to WSW at 4 - 8 mph.

OUTLOOK:

FRIDAY
Mixing height below 1000 ft early rising to 1200 - 2200 ft by late morning rising to 3300 - 4300 ft during the afternoon.  Transport wind SW to W at 8 - 12 mph.  Surface wind SSW to WSW at 5 - 9 mph.

SATURDAY
Mixing height 1500 - 2500 ft during the morning rising to 3500 - 4500 ft during the afternoon.  Transport wind WSW to WNW at 10 - 18 mph during the morning becoming WNW to NNW at 8 - 12 mph during the afternoon.  Surface wind SW to W at 8 - 12 mph during the morning becoming WNW to NNW at 5 - 9 mph during the afternoon.

SUNDAY
Mixing height below 1000 ft early rising to 2000 - 3000 ft by late morning and through the afternoon.  Transport wind SSE to SSW at 5 - 9 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 Thursday, October 29, 2009.
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Avoid ignitions within 12 miles to the SW through WNW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 20 miles to the SW through WNW 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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