SMI West (Smoke Management Instructions) Western Oregon Smoke Management Instructions

Sat Jun 20 14:20:33 PDT 2009

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

ISSUED: Saturday, June 20, 2009       2:30 PM      Nick Yonker

1.  DISCUSSION AND FORECAST FOR THE WESTERN OREGON AREA FORECAST ZONES 601-623

Upper level trough is moving into the state today and will keep the air mass cool, moist, and unstable through Sunday.  Moisture will be limited to minor showers.  Otherwise, expect mostly cloudy skies.  With excellent mixing and breezy onshore flow, smoke dispersion will remain good to excellent.

    OUTLOOK (MONDAY - WEDNESDAY)

Upper level low moves by to the east Monday with showers and clouds on the decrease.  Air mass will still remain cool and unstable.  A flat ridge moves in early Tuesday turning wind flow offshore.  Air mass stabilizes under the clear skies and warming temperatures aloft.  Offshore flow will be short-lived however as the next trough and disturbance approach Tuesday afternoon and evening.  Wind flow will turn back to onshore Tuesday afternoon and be firmly onshore Wednesday as clouds and the chance of rain increases.

2.  DISPERSION

Zone 601-612 (North Coast Range and Cascades):

MORNING
Mixing height above 5000 ft.
Transport wind W to NW at 9 - 15 mph.
Surface wind SW to W at 8 - 12 mph.

AFTERNOON
Mixing height above 5000 ft.
Transport wind W to NW at 10 - 22 mph.
Surface wind W to NW at 8 - 14 mph.

EVENING
Mixing height remains above 5000 ft.
Transport wind similar to afternoon.
Surface wind similar to afternoon.

Zone 615-623 (South Coast Range and Cascades):

MORNING
Mixing height above 5000 ft.
Transport wind NW to N at 9 - 15 mph.
Surface wind NW to NNW at 8 - 12 mph.

AFTERNOON
Mixing height above 5000 ft.
Transport wind similar to morning.
Surface wind similar to morning.

EVENING
Mixing height remains above 5000 ft.
Transport wind similar to afternoon.
Surface wind NW to N at 9 - 15 mph.

OUTLOOK:

MONDAY
In the north mixing height below 1000 ft early, rising to 3000 to 4000 ft by late morning rising above 5000 ft during the afternoon.  In the south mixing height below 1000 ft early rising to 3800 to 4800 ft by late morning rising above 5000 ft during the afternoon.  Transport wind WNW to NNW at 4 - 8 mph.  Surface wind light and variable during the morning becoming NW to N at 8 - 12 mph during the afternoon.

TUESDAY
Mixing height below 1000 ft early rising to 2500 to 3500 ft by late morning rising to 3500 to 4500 ft during the afternoon.  Transport wind N to ENE at 6 - 10 mph during the morning becoming NW to NNE at 5 - 9 mph during the afternoon.  Surface wind N to NE at 4 - 8 mph during the morning becoming NW to N at 4 - 8 mph during the afternoon.

WEDNESDAY
Mixing height below 1000 ft early rising to 2800 to 3800 ft by late morning rising to 4000 to 5000 ft during the afternoon.  Transport wind SW to W at 10 - 18 mph.  Surface wind SW to WSW at 8 - 12 mph.

3.  BURNING INSTRUCTIONS FOR ALL ZONES IN THE WESTERN OREGON AREA
These instructions are valid for burning conducted on Sunday, June 21, 2009.
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Coast Range

Zone 601 and 612
Units should be 1000 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.  Restrict units in or near corridors to 500 tons or less.

Zone 602, 603, and 620
Units should be 500 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.  Avoid burning in or near corridors.  Higher tonnage is possible south of the Siuslaw River in Zone 603.  Call the forecaster.  Higher tonnage is possible south of the Rogue River in Zone 620.  Call the forecaster.

Zone 615, 618, and 619
Use standard guidance matrix. (See section 5 below.)  Avoid burning directly upwind of the North Bend/Coos Bay SSRA.

Zone 616 west of R8W
Units should be 1500 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.

Zone 616 east of R9W
Units should be 750 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.  Restrict units to 500 tons or less south of T30S.

Cascades

Zone 605, 606, 607, 608, 609, 616, 617, and 623
Use standard guidance matrix. (See section 5 below.)  Ensure adequate distance from downwind SSRAs for smoke to dissipate.  From T15S through T20S in Zone 608 units should be 1000 tons or less, spaced 5 miles apart.

Zone 610 and 611
Units should be 1000 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.

Zone 620 and 622
Units should be 500 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.  East of R2W in Zone 622, use standard guidance matrix. (See section 5 below.)

Siskiyous
Use standard guidance matrix. (See section 5 below.)

==============================================================
4.  SPECIAL NOTE:

    Call the smoke management duty forecaster at (503) 945-7401 to
    discuss burning.  Please do not call individual's numbers to
    discuss daily burning.  If the forecaster is not available,
    leave a message and he will return your call as soon as possible.
    Avoid calling between 2 to 2:30 p.m.

    The 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

5.  STANDARD GUIDANCE MATRIX:

  * Greater than 5000 ft mixing height:  No burning within 5 miles of
    downwind SSRA.  Maximum 100 tons per mile from downwind SSRA.
    Example:  500 ton maximum allowed if burned 5 miles from downwind SSRA.

  * 3000 - 5000 ft mixing height:  No burning within 10 miles of
    downwind SSRA.  Maximum 75 tons per mile from downwind SSRA.
    Example:  750 ton maximum allowed if burned 10 miles from downwind SSRA.

  * Less than 3000 ft mixing height:  No burning within 15 miles of
    downwind SSRA.  Maximum 50 tons per mile from downwind SSRA.
    Example:  750 ton maximum allowed if burned 15 miles from downwind SSRA.

  * All exceptions must be coordinated with the duty forecaster
    prior to ignition.

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