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: Sunday, April 26, 2009       2:40 PM      Jim Little

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

Models show an upper short wave moving down from the north on Monday to keep the atmosphere a bit unstable.  Moisture is limited but there is a good chance for some mainly afternoon showers.  Mixing heights should be quite high for good to excellent smoke dispersal conditions.  Transport winds will be generally southwesterly becoming more westerly later in the day.

    OUTLOOK (TUESDAY - THURSDAY):

A second upper level short wave drops south on Tuesday eventually carving out an upper level low pressure area centered over Northwest Oregon.  This will continue cool temperatures and snow levels could drop to around 3000 feet.  The atmosphere will be unstable for good smoke dispersal conditions.  Transport winds will be generally southwesterly.

The upper low meanders ultimately splitting with a portion moving east and a portion retrograding to the west.  Showers will end later Wednesday as the air mass stabilizes somewhat, but smoke dispersal conditions should remain good.  Transport winds will remain generally northerly.

By Thursday weak ridging aloft will again cover the Pacific Northwest.  Mixing heights will remain favorable for good smoke dispersal and winds will be mostly from the northeast.
2.  DISPERSION

MONDAY
Mixing height 4000 - 5000 ft during the morning.  Mixing height rises to above 5000 ft during the afternoon then lowers to 3600 - 4600 ft during the evening.

Transport wind SSW to WSW at 8 - 14 mph during the morning.  Transport wind shifts to W to NW and increases to 10 - 22 mph during the afternoon and evening.

Surface wind SW to W at 6 - 10 mph during the morning.  Surface wind increases to WSW to WNW at 10 - 18 mph during the afternoon and evening.

OUTLOOK:

TUESDAY
Mixing height above 5000 ft throughout the day.  Transport wind W to NW at 10 - 22 mph.  Surface wind SW to W at 6 - 12 mph during the morning becoming WSW to WNW at 10 - 20 mph during the afternoon.

WEDNESDAY
Mixing height 3000 - 4000 ft during the morning rising above 5000 ft during the afternoon.  Transport wind WNW to NNW at 5 - 9 mph during the morning becoming NW to NNW at 10 - 20 mph during the afternoon.  Surface wind WNW to NNW at 5 - 9 mph during the morning becoming NW to NNW at 10 - 18 mph during the afternoon.

THURSDAY
Mixing height 2500 - 3500 ft during the 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 Monday, April 27, 2009.
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Avoid ignitions within 10 miles to the SSW through NNW of SSRAs.  Watch for shifting transport winds.  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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