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

Sat Apr 25 14:31:47 PDT 2009

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

ISSUED: Saturday, April 25, 2009       2:30 PM      Nick Yonker

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

Minor disturbance moved through early this morning to bring marine low clouds to much of the region except for the southern and eastern sections.  Cool, northerly air moving in aloft has made for good mixing.  Northerly flow will remain over the region tomorrow but marine layer will break up a little more.  Expect mostly fair to good smoke dispersion.

    OUTLOOK (MONDAY - WEDNESDAY)

Next surge of northerly flow moves in Monday as an upper low drops southward out of Canada.  Upper low will move right over the state Tuesday kicking off showers throughout much of the area.  Low will remain over the area Wednesday but gradually weaken.  Scattered showers will continue.  Expect good to excellent mixing and smoke dispersion throughout the period.

2.  DISPERSION

All Zones:

MORNING
Mixing height above 5000 ft.
Transport wind light and variable but favors NW to NNE.
Surface wind light and variable but favors NW to N and controlled by local terrain.

AFTERNOON
Mixing height above 5000 ft.
Transport wind increases to NW to N at 6 - 12 mph.
Surface wind increases to NW to N at 6 - 10 mph.

EVENING
Mixing height 2700 - 3700 ft.
Transport wind similar to afternoon.
Surface wind similar to afternoon.

OUTLOOK:

MONDAY
Mixing height below 1000 ft early rising to 3300 to 4300 ft by late morning rising above 5000 ft during the afternoon.  Transport wind NNW to NE at 5 - 9 mph during the morning becoming WNW to NNW at 8 - 14 mph during the afternoon.  Surface wind light and variable during the morning becoming WNW to NNW at 8 - 14 mph during the afternoon.

TUESDAY
Mixing height 4000 to 5000 ft during the morning rising above 5000 ft during the afternoon.  Transport wind SW to WNW at 6 - 10 mph during the morning becoming W to NW at 8 - 12 mph during the afternoon.  Surface wind SW to W at 4 - 8 mph during the morning becoming W to NW at 6 - 10 mph during the afternoon.

WEDNESDAY
Mixing height above 5000 ft throughout the day.  Transport wind NW to N at 6 - 10 mph.  Surface wind WNW to NNW at 4 - 8 mph.

3.  BURNING INSTRUCTIONS FOR ALL ZONES IN THE WESTERN OREGON AREA
These instructions are valid for burning conducted on Sunday, April 26, 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.  Higher tonnage is possible south of Waldport in Zone 612.  Call the forecaster.

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 T17S 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, 611, 616, 617, and 623
Use standard guidance matrix. (See section 5 below.)  Ensure adequate distance from downwind SSRAs for smoke to dissipate.  Verify transport winds away from SSRA if burning within 10 miles of the SSRA in Zone 605 and 606.  South of T30S in Zone 616 units should be 500 tons or less, spaced 5 miles apart.  South of T30S in Zone 617 units should be 750 tons or less, spaced 5 miles apart.

Zone 610
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.

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

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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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