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

[ODF Smoke Management Instructions]

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

ISSUED: Tuesday, September 14, 2010       2:40 PM      Jim Little

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

    WEDNESDAY

An upper level low shifts to about 450 miles west of Gray's Harbor, Washington on Wednesday.  A Pacific cold front associated with that low moves into western Oregon late in the day, however moisture from this system will not initially reach east of the Cascades.

    OUTLOOK (THURSDAY-SATURDAY)

The upper low remains about 450 miles offshore but drops south to west of Waldport on Thursday.  This leaves southwesterly flow aloft over the region and partly cloudy skies.  By Friday the upper low is approximately 400 miles west of Crescent City, California.  Another Pacific cold front spins out of this low and pushes rain to the area by Friday night.  Warm air aloft ahead of this front suppresses mixing heights. Saturday sees the low about 200 west of Coos Bay.  Yet another surge of moisture out of this low spreads widespread rain to the region but maximum mixing heights rebound to above 5000 feet.


2.  DISPERSION

WEDNESDAY
Mixing height 4300 - 5000 ft during the morning.  Mixing height rises to above 5000 ft during the afternoon then lowers to 2800 - 3800 ft during the evening.

Transport wind SSE to SSW at 6 - 12 mph during the morning.  Transport wind shifts to SW to WSW and increases to 12 - 22 mph during the afternoon and evening.

Surface wind SSE to SSW at 6 - 10 mph during the morning.  Surface wind shifts to SW to WSW and increases to 10 - 18 mph during the afternoon then decreases to SSW to WSW at 6 - 10 mph during the evening.

OUTLOOK:

THURSDAY
Mixing height below 1000 ft early rising to 3600 - 4600 ft by late morning rising above 5000 ft during the afternoon.  Transport wind SSW to WSW at 10 - 18 mph.  Surface wind S to SW at 6 - 12 mph.

FRIDAY
Mixing height below 1000 ft early rising to 2100 - 3100 ft by late morning rising to 2900 - 3900 ft during the afternoon.  Transport wind SSE to SW at 4 - 8 mph during the morning becoming SSW to WSW at 4 - 8 mph during the afternoon.  Surface wind light and variable.

SATURDAY
Mixing height below 1000 ft early rising to 1800 - 2800 ft by late morning rising to 2700 - 3700 ft during the afternoon.  Transport wind SSE to SW at 4 - 8 mph during the morning becoming SW to W 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 15, 2010.
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Avoid ignitions within 10 miles to the SSE through W of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 15 miles to the SSE through W in or near drainages leading to SSRAs.  Watch for shifting transport winds.

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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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