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: Tuesday, September 21, 2010       2:40 PM      Jim Little

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

The day begins with the region covered by the northern portion of an upper trough centered over central California.  This will move to the east during the day and weather will remain dry.  There will be a generally northwest transport wind and smoke dispersal conditions should be good.

    OUTLOOK (THURSDAY-SATURDAY)

On Thursday a generally westerly flow aloft will develop.  Weather will be dry and mixing heights should top 5000 feet.  Transport winds will be generally southwest becoming more westerly during the day.  By Friday a deep upper low in the Gulf of Alaska builds a moderate upper ridge over the Pacific Northwest.  Maximum mixing heights will remain high.  The upper low moves closer on Saturday and flow aloft veers to more southerly.  However, moisture stays well east of the state for more pleasant, dry weather.

2.  DISPERSION

WEDNESDAY
Mixing height 2600 - 3600 ft during the morning.  Mixing height rises to above 5000 ft during the afternoon then lowers to 1400 - 2400 ft during the evening.

Transport wind light and variable and controlled by local terrain during the morning.  Transport wind increases to W to NW at 8 - 14 mph during the afternoon and increases to WNW to NW at 12 - 22 mph during the evening.

Surface wind light and variable and controlled by local terrain during the morning.  Surface wind increases to W to NW at 8 - 12 mph during the afternoon and evening.

OUTLOOK:

THURSDAY
Mixing height below 1000 ft early rising to 3400 - 4400 ft by late morning rising above 5000 ft during the afternoon.  Transport wind SW to W at 10 - 18 mph.  Surface wind SSW to WSW at 6 - 12 mph during the morning becoming WSW to WNW at 10 - 20 mph during the afternoon.

FRIDAY
Mixing height below 1000 ft early rising to 1500 - 2500 ft by late morning rising above 5000 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.

SATURDAY
Mixing height below 1000 ft early rising to 2500 - 3500 ft by late morning rising above 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming SSE to SSW at 4 - 8 mph 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 Wednesday, September 22, 2010.
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Avoid ignitions within 15 miles to the WSW through NNE of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 30 miles to the SW through NNE in or near drainages leading to SSRAs.  Recommend against burning units that will smolder significantly overnight.  Complete ignitions by 4:00pm.

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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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