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

Sat Jun 26 14:17:54 PDT 2010

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS

SALEM FORESTRY WEATHER CENTER

OREGON DEPARTMENT OF FORESTRY

ISSUED: Saturday, June 26, 2010       2:30 PM      Pete Parsons

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

    SUNDAY

A flat upper-level ridge is forecast to get forced east of the state by a strengthening southwesterly flow aloft.  Weak onshore flow will bring only brief and patchy morning marine clouds inland with mostly sunny skies in the afternoon.  Temperatures will be warmer than normal.  Daytime smoke dispersal conditions should be fair to good.  A surface thermal trough will begin the day near the Cascades and progress eastward, into eastern Oregon, by evening.  That will induce increasing onshore flow, across all zones, in the afternoon and evening.  The influx of cooler marine air will rapidly lower evening mixing heights.

     OUTLOOK (MONDAY-WEDNESDAY)

As a fairly strong upper-level trough slowly approaches the coastline, increasing onshore flow will deepen the cool marine layer across western Oregon Monday and Tuesday.  Morning low clouds will become more extensive, west of the Cascade crest, with areas of drizzle, mainly from the coast range westward.  Temperatures will cool back below normal by Tuesday.  The upper-level trough is forecast to come onshore Wednesday and will likely produce at least a few showers over mainly the northern zones.  Temperatures will cool to as much as 10 degrees below normal with continued onshore flow.  Morning mixing heights will be suppressed by the cool marine layer, but afternoon smoke dispersion should be fair to good during the outlook period.

2.  DISPERSION

Zone 601, 602, 603 and 612 (North Coast Range):

MORNING

Mixing height below 500 ft early rising to 2300 - 3300 ft by late morning.

Transport wind light and variable but favors NW and controlled by local terrain.

Surface wind light and variable but favors NW and controlled by local terrain.

AFTERNOON

Mixing height rising to 4000 - 5000 ft.

Transport wind increases to W to NW at 8 - 12 mph.

Surface wind increases to W to NW at 8 - 12 mph.

EVENING

Mixing height lowers below 1500 ft after sunset.

Transport wind similar to afternoon.

Surface wind W to NW at 5 - 9 mph.

Zone 605-611 (North Cascades):

MORNING

Mixing height below 500 ft early rising to 3000 - 4000 ft by late morning.

Transport wind light and variable but favors NW and controlled by local terrain.

Surface wind light and variable but favors NW and controlled by local terrain.

AFTERNOON

Mixing height rising above 5000 ft.

Transport wind increases to W to NW at 6 - 10 mph.

Surface wind increases to W to NW at 5 - 9 mph.

EVENING

Mixing height lowers below 1500 ft after sunset.

Transport wind similar to afternoon.

Surface wind similar to afternoon.

Zone 615-620 (South Coast Range):

MORNING

Mixing height below 500 ft early rising to 2300 - 3300 ft by late morning.

Transport wind NNW to NNE at 5 - 9 mph.

Surface wind NW to N at 4 - 8 mph.

AFTERNOON

Mixing height rising to 3500 - 4500 ft.

Transport wind increases to WNW to NNW at 8 - 12 mph.

Surface wind NW to NNW at 8 - 12 mph.

EVENING

Mixing height lowers below 1500 ft after sunset.

Transport wind similar to afternoon.

Surface wind WNW to NNW at 5 - 9 mph.

Zone 616-623 (South Cascades):

MORNING

Mixing height below 500 ft early rising to 3000 - 4000 ft by late morning.

Transport wind NNW to NNE at 4 - 8 mph.

Surface wind light and variable but favors NW to NE and controlled by local terrain.

AFTERNOON

Mixing height rising above 5000 ft.

Transport wind WNW to NNW at 8 - 12 mph.

Surface wind increases to NW to NNW at 8 - 12 mph.

EVENING

Mixing height lowers below 1500 ft after sunset.

Transport wind similar to afternoon.

Surface wind WNW to NNW at 5 - 9 mph.

OUTLOOK:

MONDAY

Mixing height below 1000 ft early rising to 2000 to 3000 ft by late morning rising to 3800 to 4800 ft during the afternoon.  Transport wind light and variable during the morning becoming WNW to NNW at 8 - 12 mph during the afternoon.  Surface wind light and variable during the morning becoming WNW to NNW at 8 - 12 mph during the afternoon.

TUESDAY

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 NW to N at 5 - 9 mph.  Surface wind light and variable during the morning becoming NW to N at 6 - 12 mph during the afternoon.

WEDNESDAY

Mixing height 2000 to 3000 ft during the morning rising above 5000 ft during the afternoon.  Transport wind NW to N at 6 - 10 mph.  Surface wind light and variable during the morning becoming NW to N at 8 - 12 mph during the afternoon.

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

These instructions are valid for burning conducted on Sunday, June 27, 2010.

=================================================================

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 and 619

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

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.  From T12S through T17S in Zone 608 units should be 1000 tons or less, spaced 5 miles apart.  South of T30S in Zone 616 units should be 500 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.  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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