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: Thursday, December 3, 2009       2:40 PM      Nick Yonker

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

Upper level ridge is flattening today and will open the door for a trough and cold front to drop down from the north.  Cooler air will move in tomorrow late afternoon and evening to begin destabilizing the air mass.  Clouds will increase on Friday but moisture is not expected.  Wind flow turns onshore from the SW to NW.  Smoke dispersion will remain mostly poor to fair but improve later in the day and evening.

    OUTLOOK (SATURDAY - MONDAY):

Cold front and trough will drop to the south on Saturday bringing cooler but mainly dry air to the region.  Air mass will destabilize and wind flow turns offshore.  Another trough and more arctic-like air mass will drop southward bringing very chilly and unstable conditions on Sunday.  Moisture will be limited but expect some snow flurries or snow showers.  Arctic northerly flow will continue into Monday.  Smoke dispersion will be mostly good through the period.

2.  DISPERSION

FRIDAY
Mixing height below 1000 ft early rising to 1000 - 2000 ft by late morning.  Afternoon mixing height rising to 2300 - 3300 ft and remaining the same through the evening.

Transport wind WSW to WNW at 9 - 15 mph during the morning.  Transport wind increases to WSW to WNW at 10 - 22 mph during the afternoon and increases to W to WNW at 15 - 25 mph during the evening.

Surface wind SSW to WSW at 4 - 8 mph.

OUTLOOK:

SATURDAY
Mixing height 3700 - 4700 ft during the morning rising above 5000 ft during the afternoon.  Transport wind N to NE at 10 - 16 mph.  Surface wind NNW to NE at 6 - 12 mph.

SUNDAY
Mixing height 4500 - 5000 ft during the morning rising above 5000 ft during the afternoon.  Transport wind NE to E at 10 - 20 mph.  Surface wind NE to E at 9 - 15 mph.

MONDAY
Mixing height 3000 - 4000 ft during the morning rising above 5000 ft during the afternoon.  Transport wind NE to E at 8 - 12 mph.  Surface wind NE to ESE at 6 - 10 mph during the morning becoming light and variable during the afternoon.

3.  BURNING INSTRUCTIONS FOR ZONES 624 AND 625 INCLUDING THE WALKER
    RANGE PORTION OF ZONE 624
This instruction is valid for burning conducted on Friday, December 4, 2009.
==================================================================

Delay ignitions until 10 a.m.  Avoid ignitions within 15 miles to the WSW through WNW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 15 miles to the WSW through NNE in or near drainages leading to SSRAs.

==============================================================
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


-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://omls.oregon.gov/pipermail/smi_south_central/attachments/20091203/0242dc0f/attachment.html>