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: Wednesday, December 9, 2009       2:40 PM      Jim Little

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

** Recommend against burning due to low mixing heights and light winds **

The coldest air of the current arctic outbreak will slowly shift east.  But not before the entire Pacific Northwest experiences another bone-chilling night.  Daytime temperatures on Thursday will likely be a few degrees warmer than on Wednesday.  Very low mixing heights will continue and burning is not recommended.

    OUTLOOK (FRIDAY-SUNDAY)

Upper flow goes westerly over the area on Friday.  A weak weather system will spread generally light precipitation into southwest Oregon and that precipitation will move slowly into the region during the day.  Mixing heights will improve and the southerly transport winds will continue.  By Saturday expect light snow, slowly improving mixing heights, and a continued southerly transport wind.  Sunday will see scattered showers and mixing heights near 5000 feet for good smoke dispersal conditions.

2.  DISPERSION

THURSDAY
Mixing height below 1000 ft throughout the day.

Transport wind SW to W at 4 - 8 mph.

Surface wind light and variable and controlled by local terrain.

OUTLOOK:

FRIDAY
Mixing height below 1000 ft during the morning rising to 1700 - 2700 ft during the afternoon.  Transport wind SSW to SW at 8 - 14 mph.  Surface wind S to SW at 4 - 8 mph.

SATURDAY
Mixing height below 1000 ft early rising to 1000 - 2000 ft by late morning rising to 3500 - 4500 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.

SUNDAY
Mixing height below 1000 ft early rising to 2000 - 3000 ft by late morning rising to 4500 - 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 Thursday, December 10, 2009.
==================================================================

Unfavorable burning situation due to very poor smoke dispersion.  Delay ignitions until 11:00am.  Avoid ignitions within 20 miles to the SSW through W of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 35 miles to the SSW through W in or near drainages leading to SSRAs.  Verify transport winds away from SSRAs if burning in any other direction.  Recommend against burning units that will smolder significantly overnight.  Complete ignitions by 3:00pm.

==============================================================
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/20091209/7323d105/attachment.html>