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, September 13, 2010       2:40 PM      Jim Little

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

South Central Oregon

    TUESDAY

Upper air charts show a generally west-southwesterly flow aloft as an upper level low pressure area intensifies well off the Pacific Northwest coastline.  An embedded weak upper disturbance in the flow could touch off a few showers or isolated thunderstorms, but moisture amounts appear low.  None the less we can't rule out the possibility of a shower.

    OUTLOOK (WEDNESDAY-FRIDAY)

The flow aloft backs a little southwesterly, but the weak disturbance has moved off to the east for dry weather and more sunshine Wednesday.  By Thursday a weak cold front has spun off the upper level low and is draped across NE Oregon.  Models suggest very little moisture however.  On Friday a second, stronger, Pacific cold front moves into the northwest and brings precipitation east of the Cascades.  Daytime mixing heights remain high throughout the extended period until Friday when mixing heights briefly spike to around 5000 feet early in the afternoon, but by light afternoon have fallen to only about 2500 feet.

2.  DISPERSION

TUESDAY
Mixing height 2900 - 3900 ft during the morning.  Mixing height rises above 5000 ft during the afternoon then lowers below 1000 ft during the evening.

Transport wind light and variable and controlled by local terrain during the morning.  Transport wind increases to WSW to NW at 6 - 12 mph during the afternoon and increases to W to NW at 10 - 16 mph during the evening.

Surface wind light and variable and controlled by local terrain during the morning.  Surface wind increases to WSW to NW at 6 - 10 mph during the afternoon and evening.

OUTLOOK:

WEDNESDAY
Mixing height below 1000 ft early rising to 4000 - 5000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind SSE to SW at 6 - 12 mph during the morning becoming SW to WSW at 10 - 22 mph during the afternoon.  Surface wind S to SW at 6 - 10 mph during the morning becoming SW to W at 10 - 16 mph during the afternoon.

THURSDAY
Mixing height below 1000 ft early rising to 2300 - 3300 ft by late morning rising above 5000 ft during the afternoon.  Transport wind SSE to SSW at 4 - 8 mph during the morning becoming SSW to WSW at 4 - 8 mph during the afternoon.  Surface wind light and variable.

FRIDAY
Mixing height below 1000 ft early rising to 4500 - 5000 ft by late morning lowering to 1500 - 2500 ft during the afternoon.  Transport wind SSE to SW at 4 - 8 mph during the morning becoming SSW to WSW at 4 - 8 mph during the afternoon.  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, September 14, 2010.
==================================================================

Avoid ignitions within 15 miles to the WSW through NW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 30 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/20100913/25e79dc6/attachment.html>