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

[ODF Smoke Management Instructions]

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

ISSUED: Tuesday, April 7, 2009       2:40 PM      Nick Yonker

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

Complex weather pattern is over the region today with an upper level low to the south and a ridge to the north.  The low will spin up some moisture into region tonight with showers this evening and into Wednesday.  The upper level ridge to the north will gradually slip to the east and give way to an incoming trough later Wednesday.  Expect cooler conditions as offshore flow turns to onshore later this afternoon and evening.  Onshore flow will get firmly established over the region Wednesday.  Cooling aloft will destabilize the air mass and make for better smoke dispersion conditions.

    OUTLOOK (THURSDAY - SATURDAY):

Upper level trough in the eastern Pacific will gradually move in and bring a cold front to the region on Thursday.  Upper level trough moves through Friday bringing scattered showers and continued cool, unstable conditions.  A minor ridge moves in on Saturday bringing mostly dry weather but remaining cool and unstable.  Smoke dispersion will remain good to excellent through the period.

2.  DISPERSION

WEDNESDAY
Mixing height below 1000 ft early rising to 4000 - 5000 ft by late morning.  Afternoon mixing height rises above 5000 ft then lowers to 1800 - 2800 ft during the evening.

Transport wind W to NW at 12 - 24 mph.

Surface wind SW to WSW at 8 - 12 mph during the morning.  Surface wind increases to SW to WSW at 10 - 20 mph during the afternoon then decreases to SSW to WSW at 6 - 12 mph during the evening.

OUTLOOK:

THURSDAY
Mixing height below 1000 ft early rising to 3800 - 4800 ft by late morning rising above 5000 ft during the afternoon.  Transport wind S to SW at 8 - 14 mph.  Surface wind SSE to SSW at 5 - 9 mph during the morning becoming SW to W at 6 - 12 mph during the afternoon.

FRIDAY
Mixing height 3800 - 4800 ft during the morning rising above 5000 ft during the afternoon.  Transport wind NW to NNE at 6 - 12 mph.  Surface wind light and variable during the morning becoming NW to N at 8 - 12 mph during the afternoon.

SATURDAY
Mixing height below 1000 ft early rising to 4000 - 5000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind SW to W at 10 - 16 mph.  Surface wind SW to W at 6 - 10 mph.

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, April 8, 2009.
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Avoid ignitions within 10 miles to the W through NW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 10 miles to the SSW through NW in or near drainages leading to SSRAs.  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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