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: Monday, November 9, 2009       2:40 PM      Jim Little

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

A trough in the Gulf of Alaska will move closer to the Pacific Northwest giving southwesterly flow aloft over the region.  The atmosphere should be fairly unstable and mixing heights will be 5000 feet or above for fair to good smoke dispersal conditions.  Skies will be mainly partly cloudy with just a chance of a shower.

    OUTLOOK (WEDNESDAY-FRIDAY)

The upper level trough moves west to east across the Pacific Northwest during the day.  Subsidence behind the trough starts to stabilize the atmosphere.  Mixing heights will fall and smoke dispersal conditions become less favorable.  By Thursday temporary ridging aloft suppresses mixing heights and limits smoke dispersal smoke dispersal conditions. Mixing heights will be near 3500 feet most areas.  A strong upper trough approaches Friday and cooler air aloft with this system helps destabilize the atmosphere and improve burning prospects.

2.  DISPERSION

TUESDAY
Mixing height 3500 - 4500 ft during the morning.  Mixing height rises to above 5000 ft during the afternoon then lowers to 3500 - 4500 ft during the evening.

Transport wind SSW to WSW at 10 - 18 mph during the morning.  Transport wind increases to SW to WSW at 12 - 24 mph during the afternoon and evening.

Surface wind SSW to WSW at 8 - 12 mph during the morning and afternoon.  Surface wind decreases to SSW to WSW at 4 - 8 mph during the evening.

OUTLOOK:

WEDNESDAY
Mixing height below 1000 ft early rising to 3600 - 4600 ft by late morning and through the afternoon.  Transport wind SW to WSW at 12 - 24 mph.  Surface wind SSW to WSW at 6 - 12 mph during the morning becoming WSW to WNW at 10 - 18 mph during the afternoon.

THURSDAY
Mixing height below 1000 ft early rising to 2000 - 3000 ft by late morning rising to 3000 - 4000 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.

FRIDAY
Mixing height below 1000 ft early rising to 2000 - 3000 ft by late morning rising to 4000 - 5000 ft during the afternoon.  Transport wind light and variable.  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 Tuesday, November 10, 2009.
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Avoid ignitions within 10 miles to the SSW through WSW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 15 miles to the SSW through WSW 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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