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

Sat May 22 14:32:45 PDT 2010

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS

SALEM FORESTRY WEATHER CENTER

OREGON DEPARTMENT OF FORESTRY

ISSUED: Saturday, May 22, 2010       2:30 PM      Pete Parsons

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

SUNDAY

An unseasonably cold upper-level trough will begin pushing east of the region with the flow aloft drying and turning northwesterly.  Clearing skies will lead to a cold morning, especially across the southern zones, with low-level temperature inversions forming.  Skies should be partly to mostly cloudy with a few lingering showers, mainly over higher terrain.  Maximum temperatures will warm several degrees, relative to Saturday, but remain well below normal.  The snow level will lift to about 4000 feet in the afternoon.  High afternoon mixing heights will make for good daytime smoke dispersal conditions.

    OUTLOOK (MONDAY-WEDNESDAY)

The upper-level trough will push well east of the region by Monday with west-northwesterly flow aloft over western Oregon.  Partial clearing and light winds will allow morning low-level temperature inversions to form, so residual smoke may be trapped near the ground.  High afternoon mixing heights will provide fair to good daytime smoke dispersal conditions with increasing onshore transport winds.  A weakening weather system is forecast to bring increasing clouds Monday afternoon with a slight chance of a light shower by Monday evening.  The snow level is forecast to lift to around 6000 feet with maximum temperatures recovering to within about 5 degrees of normal. A strong southwesterly jet stream is forecast to direct another cold front onshore Tuesday with rain spreading back across all of western Oregon.  Another upper-level trough will bring showers to the region Wednesday with snow levels dropping below 5000 feet. High mixing heights and brisk transport winds should make for good smoke dispersal conditions.

2.  DISPERSION

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

MORNING

Mixing height below 1500 ft early rising to 3700 - 4700 ft by late morning.

Transport wind SSW to WSW at 6 - 12 mph.

Surface wind SSW to WSW at 4 - 8 mph.

AFTERNOON

Mixing height above 5000 ft.

Transport wind WSW to WNW at 8 - 14 mph.

Surface wind SW to WNW at 6 - 12 mph.

EVENING

Mixing height 1500 - 2500 ft.

Transport wind SW to WNW at 5 - 9 mph.

Surface wind SW to WNW at 4 - 8 mph.

Zone 615-620 (South Coast Range):

MORNING

Mixing height below 1500 ft early rising to 3700 - 4700 ft by late morning.

Transport wind WNW to NNW at 4 - 8 mph.

Surface wind WNW to NNW at 4 - 8 mph.

AFTERNOON

Mixing height 4200 - 5000 ft.

Transport wind increases to W to NW at 10 - 16 mph.

Surface wind increases to W to NW at 9 - 15 mph.

EVENING

Mixing height 1500 - 2500 ft.

Transport wind decreases to W to NW at 5 - 9 mph.

Surface wind W to NW at 5 - 9 mph.

Zone 616-623 (South Cascades):

MORNING

Mixing height below 1500 ft early rising to 4000 - 5000 ft by late morning.

Transport wind WNW to NNW at 4 - 8 mph.

Surface wind WNW to NNW at 4 - 8 mph.

AFTERNOON

Mixing height above 5000 ft.

Transport wind WNW to NW at 8 - 12 mph.

Surface wind WNW to NNW at 8 - 14 mph.

EVENING

Mixing height 1500 - 2500 ft.

Transport wind NW to N at 6 - 10 mph.

Surface wind NW to N at 5 - 9 mph.

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 S to SW at 8 - 12 mph during the morning becoming SSW to WSW at 10 - 16 mph during the afternoon.  Surface wind SSE to SSW at 5 - 9 mph during the morning becoming SSW to SW at 8 - 12 mph during the afternoon.

TUESDAY

Mixing height 1800 to 2800 ft during the morning rising to 4000 to 5000 ft during the afternoon.  Transport wind SE to S at 13 - 25 mph.  Surface wind SE to S at 8 - 14 mph during the morning becoming S to SW at 10 - 18 mph during the afternoon.

WEDNESDAY

Mixing height 2100 to 3100 ft during the morning rising above 5000 ft during the afternoon.  Transport wind SSW to WSW at 4 - 8 mph during the morning becoming SW to WNW at 5 - 9 mph during the afternoon.  Surface wind SW to W at 4 - 8 mph 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 Sunday, May 23, 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 and 603

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.

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

Units should be 2000 tons or less, spaced 8 miles apart, and 10 miles from downwind SSRAs.

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 5 miles apart.

Zone 610, 611, and 622

Units should be 1000 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.)

Zone 620

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.)

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

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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