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

Wed Sep 29 14:32:15 PDT 2010

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS

SALEM FORESTRY WEATHER CENTER

OREGON DEPARTMENT OF FORESTRY

ISSUED: Wednesday, September 29, 2010       2:30 PM      Pete Parsons

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

    THURSDAY

A strong upper-level ridge will remain over the Pacific Northwest but shift slightly eastward.  The ridge axis will extend from eastern Nevada northwestward, over eastern Oregon, into British Columbia.  A surface thermal trough will shift inland, into southern Oregon, and extend northwestward to just off the north coast. Suppressed mixing heights and light transport winds will make for marginal ventilation conditions.

    OUTLOOK (FRIDAY-SUNDAY)

The upper-level ridge will weaken and continue to slowly shift eastward.  The surface thermal trough is forecast to progress east of the Cascades Friday with light onshore transport winds.  Transport winds are expected to turn more northerly Saturday, and then turn strongly onshore Sunday, as an upper-level trough, and corresponding cold front, approach the coastline. That will improve ventilation conditions.

2.  DISPERSION

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

MORNING

Mixing height below 500 ft early rising to 1000 - 1900 ft by late morning.

Transport wind NNE to ENE at 5 - 9 mph.

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

AFTERNOON

Mixing height rising to 2000 - 3000 ft.

Transport wind NE to ESE at 6 - 10 mph.

Surface wind increases to NNE to ENE at 4 - 8 mph.

EVENING

Mixing height lowers below 1000 ft.

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

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

Zone 605-611 (North Cascades):

MORNING

Mixing height below 500 ft early rising to 1000 - 1900 ft by late morning.

Transport wind ENE to ESE at 4 - 8 mph.

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

AFTERNOON

Mixing height rising to 2000 - 3000 ft.

Transport wind similar to morning.

Surface wind increases to NNE to ENE at 4 - 8 mph.

EVENING

Mixing height lowers below 1000 ft.

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

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

Zone 615-620 (South Coast Range):

MORNING

Mixing height below 500 ft early rising to 1000 - 2000 ft by late morning.

Transport wind light and variable and controlled by local terrain.

Surface wind light and variable and controlled by local terrain.

AFTERNOON

Mixing height 2000 - 3000 ft.

Transport wind shifts to W to NW at 4 - 8 mph.

Surface wind increases to W to NNW at 4 - 8 mph.

EVENING

Mixing height lowers below 1000 ft.

Transport wind becomes light and variable and controlled by local terrain.

Surface wind becomes light and variable and controlled by local terrain.

Zone 616-623 (South Cascades):

MORNING

Mixing height below 500 ft early rising to 1800 - 2800 ft by late morning.

Transport wind ESE to S at 4 - 8 mph.

Surface wind light and variable and controlled by local terrain.

AFTERNOON

Mixing height 2500 - 3500 ft.

Transport wind becomes light and variable and controlled by local terrain.

Surface wind similar to morning.

EVENING

Mixing height lowers below 1000 ft.

Transport wind similar to afternoon.

Surface wind similar to afternoon.

OUTLOOK:

FRIDAY

Mixing height below 1000 ft early rising to 1400 to 2400 ft by late morning rising to 2400 to 3400 ft during the afternoon.  Transport wind light and variable during the morning becoming W to NW at 4 - 8 mph during the afternoon.  Surface wind light and variable during the morning becoming W to NNW at 4 - 8 mph during the afternoon.

SATURDAY

Mixing height below 1000 ft early rising to 1200 to 2200 ft by late morning rising to 2300 to 3300 ft during the afternoon.  Transport wind light and variable during the morning becoming NNW to NNE at 4 - 8 mph during the afternoon.  Surface wind light and variable.

SUNDAY

Mixing height below 1000 ft early rising to 1300 to 2300 ft by late morning rising to 3400 to 4400 ft during the afternoon.  Transport wind SW to WNW at 4 - 8 mph.  Surface wind light and variable during the morning becoming WSW to WNW at 4 - 8 mph during the afternoon.

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

These instructions are valid for burning conducted on Thursday, September 30, 2010.

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Coast Range

Zone 601, 602, 603, and 612

Use standard guidance matrix. (See section 5 below.)  Avoid burning directly upwind of coastal SSRAs.

Zone 615 and 616 west of R8W

Units should be 1000 tons or less, spaced 15 miles apart, and 15 miles from downwind SSRAs.

Zone 616 east of R9W

Units should be 750 tons or less, spaced 15 miles apart, and 15 miles from downwind SSRAs.

Zone 618 and 619

Units should be 1500 tons or less, spaced 15 miles apart, and 15 miles from downwind SSRAs.

Zone 620

Units should be 500 tons or less, spaced 15 miles apart, and 15 miles from downwind SSRAs.  Higher tonnage is possible south of T35S.  Call the forecaster.

Cascades

Zone 605 and 606

No burning allowed.

Zone 607 and 608

Units should be 500 tons or less, spaced 15 miles apart, and 15 miles from downwind SSRAs.

Zone 609, 610, and 611

Units should be 1000 tons or less, spaced 15 miles apart, and 15 miles from downwind SSRAs.

Zone 616

Units should be 750 tons or less, spaced 10 miles apart, and 12 miles from downwind SSRAs.

Zone 617 and 623

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

Zone 620 and 622

No burning allowed.

Siskiyous

Units should be 750 tons or less, spaced 10 miles apart, and 12 miles from downwind SSRAs.

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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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