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, October 21, 2009       2:40 PM      Jim Little

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

In the upper atmosphere a ridge builds over the region.  At the surface an area of high pressure pushes in from the southwest and blankets the entire Pacific Northwest by afternoon.  This will suppress mixing heights and give light transport winds to the area.  Mixing heights will allow for only marginal smoke dispersal conditions.

    OUTLOOK (FRIDAY-SUNDAY)

An upper trough approaches the Pacific Northwest on Friday.  The surface high weakens and its center moves east allowing transport winds to pick up and become more west-southwesterly.  Mixing heights improve slightly.  Another weather system moves in from the Pacific but rain should generally skirt the area to the north with only a few sprinkles into south-central Oregon.  By Sunday a surface high returns for dry weather.  Mixing heights remain in the marginal category through the outlook period.

2.  DISPERSION

THURSDAY
Mixing height 1000 - 2000 ft during the morning.  Afternoon mixing height rises to 3000 - 4000 ft then lowers below 1000 ft during the evening.

Transport wind light and variable and controlled by local terrain.

Surface wind light and variable and controlled by local terrain.

OUTLOOK:

FRIDAY
Mixing height below 1000 ft early rising to 2600 - 3600 ft by late morning rising to 3500 - 4500 ft during the afternoon.  Transport wind WSW to NW at 4 - 8 mph during the morning becoming W to WNW at 14 - 28 mph during the afternoon.  Surface wind light and variable during the morning becoming W to NW at 10 - 20 mph during the afternoon.

SATURDAY
Mixing height below 1000 ft early rising to 1200 - 2200 ft by late morning rising to 3100 - 4100 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.

SUNDAY
Mixing height below 1000 ft early rising to 1000 - 2000 ft by late morning rising to 3000 - 4000 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, October 22, 2009.
==================================================================

Unfavorable burning situation due to very poor smoke dispersion.  Delay ignitions until 9:00am.  Avoid ignitions within 20 miles in all directions of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 35 miles in all directions of SSRAs.  Recommend against burning units that will smolder significantly overnight.  Complete ignitions by 4:00pm.

==============================================================
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/20091021/87a1ad44/attachment.html>