SMI South Central (Smoke Management Instructions) South Central Smoke Management Instructions

ODF Smoke Management Instructions smi_south_central at listsmart.osl.state.or.us
Fri Apr 17 14:32:12 PDT 2009


SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS
SALEM FORESTRY WEATHER CENTER
OREGON DEPARTMENT OF FORESTRY

ISSUED: Friday, April 17, 2009       2:40 PM      Nick Yonker

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

Weak cold front and upper trough are passing through the region this afternoon and will push east of the state this evening.  Next, the upper ridge will start building in over the weekend providing the warmest temperatures of the year.  Expect mostly clear skies.  Air mass will stabilize as temperatures warm aloft.  In addition, wind flow will become quite light, leading to generally poor smoke dispersion.

    OUTLOOK (SUNDAY - TUESDAY):

Upper level ridge will remain firmly entrenched over the region through the period with only slight weakening on Tuesday.  Expect continued sunny skies and warm temperatures.  Mixing will be mostly poor except for brief afternoon instability.  Also, wind flow will remain light, leading to continued poor smoke dispersion.

2.  DISPERSION

SATURDAY
Mixing height below 1000 ft early rising to 2000 - 3000 ft by late morning.  Afternoon mixing height rises to 4400 - 5000 ft then lowers below 1000 ft during the evening.

Transport wind ESE to SSE at 6 - 12 mph during the morning.  Transport wind becomes light and variable and controlled by local terrain during the afternoon and evening.

Surface wind light and variable and controlled by local terrain.

OUTLOOK:

SUNDAY
Mixing height below 1000 ft early rising to 1500 - 2500 ft by late morning rising to 3500 - 4500 ft during the afternoon.  Transport wind ESE to SSE at 6 - 12 mph during the morning becoming WSW to WNW at 4 - 8 mph during the afternoon.  Surface wind light and variable during the morning becoming W to NW at 4 - 8 mph during the afternoon.

MONDAY
Mixing height below 1000 ft early rising to 2500 - 3500 ft by late morning rising to 3500 - 4500 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.

TUESDAY
Mixing height below 1000 ft early rising to 2000 - 3000 ft by late morning rising to 3500 - 4500 ft during the afternoon.  Transport wind light and variable during the morning becoming W to NW at 6 - 10 mph during the afternoon.  Surface wind light and variable during the morning becoming WSW to NW at 4 - 8 mph 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 Saturday, April 18, 2009.
==================================================================

Avoid ignitions within 12 miles in all directions of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 25 miles in all directions of SSRAs.  Recommend against burning units that will smolder significantly overnight.

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


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