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: Monday, May 25, 2009       2:40 PM      Jim Little

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

The Pacific Northwest will remain under a generally west-southwest flow aloft on Tuesday.  A weak front will move across Washington, but be too far away to have any effect on this area.  Mixing heights should be favorable for good smoke dispersal. Transport winds will be generally northwesterly.

    OUTLOOK (WEDNESDAY-FRIDAY)

Weak ridging aloft will continue the dry weather for the area on Wednesday.  Transport winds will be generally northerly.  Mixing heights still providing good smoke dispersal conditions.  However nighttime inversions will hold residual smoke close to the ground during the early morning hours.  Thursday and Friday the ridge sharpens a bit with its axis to the east for more southerly flow over the region.  This could allow isolated thunder storms over mountainous areas.

2.  DISPERSION

TUESDAY
Mixing height 2300 - 3300 ft during the morning.  Mixing height rises to above 5000 ft during the afternoon then lowers to 1200 - 2200 ft during the evening.

Transport wind light and variable and controlled by local terrain during the morning.  Transport wind increases to WNW to NNW at 9 - 15 mph during the afternoon and increases to NW to NNW at 12 - 24 mph during the evening.

Surface wind light and variable and controlled by local terrain during the morning.  Surface wind increases to WNW to NNW at 8 - 12 mph during the afternoon and evening.

OUTLOOK:

WEDNESDAY
Mixing height below 1000 ft early rising to 2400 - 3400 ft by late morning rising above 5000 ft during the afternoon.  Transport wind NNE to ENE at 6 - 10 mph during the morning becoming light and variable during the afternoon.  Surface wind light and variable during the morning becoming WNW to NNW at 6 - 10 mph during the afternoon.

THURSDAY
Mixing height below 1000 ft early rising to 4500 - 5000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.

FRIDAY
Mixing height below 1000 ft early rising to 4500 - 5000 ft by late morning rising above 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 Tuesday, May 26, 2009.
==================================================================

Avoid ignitions within 15 miles to the WNW through N of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 30 miles to the WNW through NE in or near drainages leading to 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/20090525/82164ff5/attachment.html>