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

Wed Jun 9 14:20:07 PDT 2010

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS

SALEM FORESTRY WEATHER CENTER

OREGON DEPARTMENT OF FORESTRY

ISSUED: Wednesday, June 9, 2010       2:30 PM      Pete Parsons

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

    THURSDAY

A cool upper-level trough will move over western Oregon in the morning and across eastern Oregon during the afternoon.  Cold air aloft will drop the snow level to 4000 feet north and 5000 feet south with daytime heating helping to destabilize the air mass and maintain widespread shower activity.  Temperatures will be well below normal.  Smoke dispersal conditions will be fair to good with moderately high mixing heights and onshore transport winds.  The flow aloft is forecast to slowly turn more northerly overnight, with the air mass stabilizing and drying.  A few showers could linger into Friday morning.

    OUTLOOK (FRIDAY-SUNDAY)

An upper-level ridge will build just offshore on Friday with the flow aloft drying and turning north-northwesterly.  That will finally put an end to the long stretch of very wet weather with skies clearing and transport winds turning more northerly.  Even with some June sunshine, cool air aloft will keep surface temperatures slightly below normal.  Subsidence, associated with the building upper-level ridge, will likely cap afternoon mixing heights between 3000 and 5000 feet.  The upper-level ridge will move over western Oregon Saturday and eastern Oregon Sunday for dry and warmer conditions.  Transport winds will turn offshore with surface temperatures warming to above normal both days.  Daytime heating should make for high afternoon mixing heights.  Increasing southwesterly flow aloft may turn transport winds onshore late Sunday, especially north.

2.  DISPERSION

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

MORNING

Mixing height 2000 - 3000 ft.

Transport wind WSW to WNW at 10 - 16 mph.

Surface wind WSW to WNW at 8 - 12 mph.

AFTERNOON

Mixing height rising to 3500 - 4500 ft.

Transport wind W to NW at 10 - 20 mph.

Surface wind W to NW at 8 - 12 mph.

EVENING

Mixing height 1500 - 2500 ft.

Transport wind WNW to NNW at 9 - 15 mph.

Surface wind WNW to NNW at 5 - 9 mph.

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

MORNING

Mixing height 2000 - 3000 ft.

Transport wind W to NW at 8 - 12 mph.

Surface wind W to NW at 8 - 12 mph.

AFTERNOON

Mixing height rising to 3500 - 4500 ft.

Transport wind WNW to NNW at 9 - 15 mph.

Surface wind WNW to NNW at 8 - 12 mph.

EVENING

Mixing height 1500 - 2500 ft.

Transport wind NW to N at 10 - 16 mph.

Surface wind NW to N at 8 - 12 mph.

OUTLOOK:

FRIDAY

Mixing height 1700 to 2700 ft during the morning rising to 3600 to 4600 ft during the afternoon.  Transport wind NNW to NE at 5 - 9 mph during the morning becoming NNW to NNE at 10 - 16 mph during the afternoon.  Surface wind light and variable during the morning becoming N to NE at 8 - 14 mph during the afternoon.

SATURDAY

Mixing height below 1000 ft early rising to 3200 to 4200 ft by late morning rising to 4200 to 5000 ft during the afternoon.  Transport wind ENE to ESE at 8 - 12 mph during the morning becoming NNE to ENE at 6 - 10 mph during the afternoon.  Surface wind light and variable during the morning becoming NNW to NE at 4 - 8 mph during the afternoon.

SUNDAY

Mixing height below 1000 ft early rising to 3400 to 4400 ft by late morning rising above 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming NW to N at 8 - 14 mph during the afternoon.  Surface wind light and variable during the morning becoming NW to N at 6 - 12 mph during the afternoon.

3.  BURNING INSTRUCTIONS FOR ALL ZONES IN THE WESTERN OREGON AREA

These instructions are valid for burning conducted on Thursday, June 10, 2010.

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Coast Range

Zone 601 and 612

Units should be 750 tons or less, spaced 8 miles apart, and 10 miles from downwind SSRAs.  Restrict units in or near corridors to 500 tons or less.

Zone 602 and 603

Units should be 300 tons or less, spaced 8 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.

Zone 615

Units should be 1200 tons or less, spaced 8 miles apart, and 10 miles from downwind SSRAs.

Zone 616 west of R8W

Units should be 1000 tons or less, spaced 8 miles apart, and 10 miles from downwind SSRAs.

Zone 616 east of R9W and 620

Units should be 500 tons or less, spaced 8 miles apart, and 10 miles from downwind SSRAs.  Higher tonnage is possible south of T35S in Zone 620.  Call the forecaster.

Zone 618

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

Zone 619

Units should be 1500 tons or less, spaced 8 miles apart, and 10 miles from downwind SSRAs.

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 8 miles apart.

Zone 610 and 611

Units should be 1000 tons or less, spaced 8 miles apart, and 10 miles from downwind SSRAs.

Zone 620 and 622

Units should be 500 tons or less, spaced 8 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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