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

[ODF Smoke Management Instructions]

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

ISSUED: Thursday, April 2, 2009       2:40 PM      Nick Yonker

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

Upper level trough moves through the region tonight and tomorrow keeping cool, northwesterly flow over the region.  Trough will move by to the east Friday afternoon as an upper ridge approaches from off the coast.  Air mass slowly dries out but remains unstable.  Expect mostly cloudy skies with a chance of a few light showers.  Snow level will remain near the surface throughout most of the day.  Good mixing and moderate NW'erly flow will make for excellent smoke dispersion.

    OUTLOOK (SATURDAY - MONDAY):

A period of spring like weather finally makes an appearance over the weekend and into early next week as an upper level ridge moves in on Saturday and Sunday.  The next frontal system dives mainly to the south of the state later Sunday and Monday.  It appears the region will stay dry through the period with moisture staying to the south in California.  Air mass will stabilize, especially during the night and morning, then destabilize during the afternoon.  Wind flow weakens and turns offshore.  Smoke dispersion slowly worsens.

2.  DISPERSION

FRIDAY
Mixing height above 5000 ft throughout the day.

Transport wind NW to NNW at 15 - 25 mph.

Surface wind WNW to NNW at 9 - 15 mph during the morning and afternoon.  Surface wind decreases to WNW to NNW at 6 - 10 mph during the evening.

OUTLOOK:

SATURDAY
Mixing height 3000 - 4000 ft during the morning rising to 4300 - 5000 ft during the afternoon.  Transport wind ENE to ESE at 6 - 10 mph during the morning becoming ESE to SSE at 9 - 15 mph during the afternoon.  Surface wind light and variable during the morning becoming E to SE at 6 - 10 mph during the afternoon.

SUNDAY
Mixing height below 1000 ft early rising to 3500 - 4500 ft by late morning rising to 4500 - 5000 ft during the afternoon.  Transport wind SE to S at 12 - 22 mph during the morning becoming E to SE at 10 - 20 mph during the afternoon.  Surface wind SE to S at 9 - 15 mph during the morning becoming E to SE at 5 - 9 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 E to SE at 8 - 12 mph.  Surface wind E to SE at 5 - 9 mph during the morning becoming light and variable 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 Friday, April 3, 2009.
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Avoid ignitions within 10 miles to the NW through N of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 10 miles to the NW through E in or near drainages leading to SSRAs.  No additional restrictions necessary.

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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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