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

Fri Apr 23 16:23:48 PDT 2010

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS

SALEM FORESTRY WEATHER CENTER

OREGON DEPARTMENT OF FORESTRY

ISSUED: Friday, April 23, 2010       2:30 PM      Nick Yonker

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

West-northwesterly flow aloft will direct a weak cold front across southern British Columbia and Washington on Saturday.  The southern end of the front may be strong enough to bring a few showers to mainly the northern zones with onshore surface flow. Smoke dispersion will be good to excellent.

    OUTLOOK (SUNDAY - TUESDAY)

Upper-level ridge moves over Oregon Sunday for dry weather. Surface and transport winds decrease and become slightly offshore.  Smoke dispersion will be poor in the morning...becoming fair in the afternoon.  The flow aloft turns southwesterly Monday with a strong cold front forecast to bring widespread rain and possibly strong winds to all zones.  Smoke dispersion will improve Monday afternoon, and become excellent on Tuesday with a cold upper-level trough moving over the state.

2.  DISPERSION

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

MORNING

Mixing height above 5000 ft.

Transport wind SW to W at 15 - 25 mph.

Surface wind WSW to WNW at 8 - 14 mph.

AFTERNOON

Mixing height above 5000 ft.

Transport wind similar to morning.

Surface wind similar to morning.

EVENING

Mixing height lowers below 3000 ft after sunset.

Transport wind WNW to NW at 10 - 18 mph.

Surface wind W to NW at 6 - 12 mph.

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

MORNING

Mixing height 2500 - 3500 ft.

Transport wind WSW to WNW at 9 - 15 mph.

Surface wind WSW to NW at 6 - 10 mph.

AFTERNOON

Mixing height rising above 5000 ft.

Transport wind similar to morning.

Surface wind WNW to NNW at 8 - 12 mph.

EVENING

Mixing height lowers below 2000 ft after sunset.

Transport wind WNW to NNW at 8 - 12 mph.

Surface wind NW to NNE at 6 - 10 mph.

OUTLOOK:

SUNDAY

In the north mixing height below 1000 ft early rising to 2900 to 3900 ft by late morning and through the afternoon.  In the south mixing height below 1000 ft early rising to 2300 to 3300 ft by late morning rising to 3800 to 4800 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.

MONDAY

Mixing height below 1000 ft early rising to 2500 to 3500 ft by late morning rising to 3400 to 4400 ft during the afternoon.  Transport wind SSE to S at 18 - 30 mph during the morning becoming SSE to SSW at 21 - 37 mph during the afternoon.  Surface wind SE to S at 10 - 16 mph.

TUESDAY

Mixing height 2700 to 3700 ft during the morning rising above 5000 ft during the afternoon.  Transport wind SW to W at 13 - 25 mph.  Surface wind WSW to WNW at 10 - 20 mph.

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

These instructions are valid for burning conducted on Saturday, April 24, 2010.

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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.  North of Tillamook in Zone 601, use standard guidance matrix. (See section 5 below.)

Zone 602, 603, and 620

Units should be 500 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.  North of T3N in Zone 602, use standard guidance matrix. (See section 5 below.)  Avoid burning in or near corridors.  Units may be 750 tons or less, spaced 5 miles apart, south of the Siuslaw River in Zone 603.  Higher tonnage is possible south of T35S in Zone 620.  Call the forecaster.

Zone 615

Units should be 1500 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.

Zone 616 west of R8W

Units should be 1200 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.

Zone 618

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

Zone 619

Units should be 2000 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.

Cascades

Zone 605, 606, 607, 608, 609, 616, 617, 622, 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, 611, and 620

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

Siskiyous

Units should be 1500 tons or less, spaced 5 miles apart, and 10 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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