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

[ODF Smoke Management Instructions]

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

ISSUED: Tuesday, November 10, 2009           2:30 PM           Jim Trost

NOTE:  The forecast office will be closed Wednesday, November 11th in observance of Veterans Day.  A forecast and instruction will be issued by approximately 8:00 AM Thursday morning.

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

Next upper level trough moves toward the coast Wednesday. Rain (snow at the higher elevations) spills across the Cascades in the late afternoon and evening.  Precipitation amounts fairly light.  Low level flow southwesterly to northwest.  This variability will necessitate careful selection of burn units.  Air mass destabilizes as the trough nears resulting in good afternoon mixing.  Daytime smoke dispersion good but mixing height falls rapidly in the evening.  This could create problems for residual smoke from units near SSRAs.

    OUTLOOK (THURSDAY - SATURDAY)

Unsettled weather continues to the weekend.  Then on Saturday a ridge drifts over the Pacific Northwest.  This will bring the mixing height down somewhat.  Periods of rain, snow, or showers likely through Friday but as the ridge strengthens, Saturday should be dry.  Daytime smoke dispersion fairly good but units that smolder into the nights are likely to create problems for nearby SSRAs.

2.  DISPERSION

WEDNESDAY
Mixing height 2900 - 3900 ft through the morning, rising to 3800 - 4800 ft in the afternoon and lowering to 1200 - 2200 ft in the evening.  Mixing height drops below 1000 ft overnight.

Transport wind SSW to WSW at 8 - 12 mph.

Surface wind SSW to WSW at 8 - 14 mph.

OUTLOOK:

THURSDAY
Mixing height below 1000 ft early, 2300 - 3300 ft by late morning and 4300 - 5000 ft during the afternoon.  Transport wind SW to WSW at 8 - 14 mph in the morning and WSW to NW at 6 - 12 mph during the afternoon.  Surface wind SSW to WSW at 6 - 10 mph in the morning and W to NW at 6 - 10 mph in the afternoon.

FRIDAY
Mixing height below 1000 ft early, rising to 2000 - 3000 ft by late morning and to 4000 - 5000 ft during the afternoon.  Transport wind SSW to SW at 8 - 14 mph during the morning, becoming WSW to WNW at 8 - 12 mph in the afternoon.  Surface wind light and variable, becoming SW to W at 4 - 8 mph during the afternoon.

SATURDAY
Mixing height below 1000 ft early, 1000 - 1900 ft by late morning and 3500 - 4500 ft in the afternoon.  Transport wind SE to SSW at 4 - 8 mph.  Surface wind light and variable, becoming SE to S at 4 - 8 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 Wednesday, November 11, 2009.
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Avoid ignitions within 15 miles to the SSW through WNW of SSRAs.  Complete ignitions by 3 PM. For units that will smolder into the night, avoid burning within at least 30 miles to the SSW through WNW in or near drainages leading to SSRAs.  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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