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, October 12, 2009       2:40 PM      Jim Little

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

A complex upper air situation in progress during the day on Tuesday.  An upper level low will retrograde westward across central British Columbia and a second upper level low will move toward Oregon over the ocean from the southwest.  The two systems will combine for southwesterly flow aloft and a Pacific cold front will spread rain into the region.  Amounts will be significant, greatest since last spring most areas, however the heaviest rains will actually move into northern California.

    OUTLOOK (WEDNESDAY-FRIDAY)

Expect post-frontal showers on Wednesday.  Snow levels should be 7000 feet or above.  Mixing heights should be quite high for good smoke dispersal conditions.  On Thursday a front moves mainly into northwest Oregon and western Washington.  Some scattered showers may continue in the area.  By Friday dry weather will return to the area.  Mixing heights should be high enough to allow for fair to good smoke dispersal conditions.


2.  DISPERSION

TUESDAY
Mixing height 3700 - 4700 ft during the morning.  Afternoon and evening mixing rises to 4400 - 5000 ft.

Transport wind S to SSW at 34 - 54 mph.

Surface wind S to SSW at 19 - 33 mph.

OUTLOOK:

WEDNESDAY
Mixing height 3100 - 4100 ft during the morning rising above 5000 ft during the afternoon.  Transport wind SW to SW at 25 - 45 mph during the morning becoming SW to WSW at 19 - 33 mph during the afternoon.  Surface wind SSW to SW at 12 - 24 mph.

THURSDAY
Mixing height below 1000 ft early rising to 3000 - 4000 ft by late morning and through 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, October 13, 2009.
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Avoid ignitions within 10 miles to the S through SSW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 10 miles to the S through SW in or near drainages leading to 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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