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: Tuesday, October 20, 2009       2:40 PM      Jim Little

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

Tuesday's upper ridge axis shifts east and an upper trough moves mainly into British Columbia and Washington on Wednesday.  The trailing cold front is rather weak since most of its support well to the north.  Thus it should dissipate before reaching the region.

    OUTLOOK (WEDNESDAY-FRIDAY)

Another upper ridge builds over the area for dry weather and light winds Wednesday.  The ridge axis aloft shifts slightly east and another very weak front spreads some light rain to northwest Oregon by Friday evening. It is unlikely that any rain will make it into south-central Oregon, however. Expect another upper ridge Saturday.  There is some evidence of a pattern change beginning Sunday or early next week that could bring more storminess to the area.


2.  DISPERSION

WEDNESDAY
Mixing height 2800 - 3800 ft during the morning.  Mixing height rises above 5000 ft during the afternoon then lowers below 1000 ft during the evening.

Transport wind SSW to WSW at 9 - 15 mph during the morning.  Transport wind shifts to WSW to WNW at 10 - 20 mph during the afternoon and evening.

Surface wind SSW to SW at 8 - 12 mph during the morning.  Surface wind shifts to WSW to WNW at 9 - 15 mph during the afternoon then becomes light and variable and controlled by local terrain during the evening.

OUTLOOK:

THURSDAY
Mixing height 1100 - 2100 ft during the morning rising to 2700 - 3700 ft during the afternoon.  Transport wind N to NE at 6 - 10 mph.  Surface wind light and variable during the morning becoming N to NE at 6 - 12 mph during the afternoon.

FRIDAY
Mixing height below 1000 ft early rising to 1000 - 2000 ft by late morning rising to 2500 - 3500 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.

SATURDAY
Mixing height below 1000 ft early rising to 1600 - 2600 ft by late morning rising to 3100 - 4100 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 Wednesday, October 21, 2009.
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Avoid ignitions within 15 miles to the SSW 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.  Watch for shifting transport winds.  Recommend against burning units that will smolder significantly overnight.  Complete ignitions by 4:00pm.

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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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