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, October 13, 2009       2:40 PM      Jim Little

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

During the day on Wednesday an upper level low consolidates west of southern British Columbia.  Post frontal showers continue through the day.  Mixing heights should be generally favorable for good smoke dispersal.  Transport winds will be generally southwesterly.

    OUTLOOK (THURSDAY-SATURDAY)

The upper low weakens and moves northwest slightly allowing higher pressure to build aloft.  The ridge axis will be over eastern Oregon/eastern Washington.  This will give mostly dry weather to the region.  Mixing heights should still be high enough for fair to good smoke dispersal conditions on Thursday.  The ridge axis shifts slightly east on Friday but dry weather will continue.  By Saturday the remains of a weak front will move through giving a chance of light rain.

2.  DISPERSION

WEDNESDAY
Mixing height 3800 - 4800 ft during the morning.  Mixing height rises to above 5000 ft during the afternoon then lowers to 3000 - 4000 ft during the evening.

Transport wind SSW to SW at 32 - 52 mph during the morning.  Transport wind decreases to SW to WSW at 23 - 41 mph during the afternoon and evening.

Surface wind SSW to SW at 19 - 33 mph during the morning.  Surface wind decreases to SSW to WSW at 15 - 25 mph during the afternoon and decreases to SSW to WSW at 10 - 22 mph during the evening.

OUTLOOK:

THURSDAY
Mixing height 2300 - 3300 ft during the morning rising above 5000 ft during the afternoon.  Transport wind SSW to SW at 12 - 24 mph.  Surface wind SSW to SW at 8 - 14 mph.

FRIDAY
Mixing height below 1000 ft early rising to 1500 - 2500 ft by late morning rising to 3500 - 4500 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.

SATURDAY
Mixing height below 1000 ft early rising to 2000 - 3000 ft by late morning and through 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 Wednesday, October 14, 2009.
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Avoid ignitions within 10 miles to the SSW through WSW of SSRAs.  Care needed in selecting units as smoke will likely fumigate along the ground in wind prone areas.  No additional restrictions necessary.

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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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