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

Fri Jun 4 13:43:58 PDT 2010

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS

SALEM FORESTRY WEATHER CENTER

OREGON DEPARTMENT OF FORESTRY

ISSUED: Friday, June 4, 2010       2:30 PM      Pete Parsons

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

    SATURDAY

The region will get a break from the moderate to heavy rains of the past couple of days, as a transitory upper-level ridge pushes an unseasonably strong westerly jet stream slightly north.  High pressure will also build at the surface, resulting in light transport winds.  Residual marine clouds will give way to at least partly sunny skies, which will help temperatures recover to near normal. Ventilation conditions will be poor in the morning but should improve in the afternoon, as mixing heights climb in response to daytime heating.

    OUTLOOK (SUNDAY-TUESDAY)

The strong westerly jet stream will direct another, weaker, weather system across Washington and Oregon on Sunday.  Light to moderate rainfall is possible again across the entire region, although rainfall amounts should not be as great as they were with the past two storms. Clouds and rain will cool surface temperatures back below normal.  Some drying is expected on Monday with skies becoming partly to mostly sunny.  Temperatures should be near normal.  The next system is forecast to bring back a chance of rain by Tuesday afternoon and could also produce impressive rainfall totals from late Tuesday through Wednesday.  High afternoon mixing heights will provide fair to good daytime smoke dispersal conditions during the outlook period.

2.  DISPERSION

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

MORNING

Mixing height below 1000 ft early rising to 3000 - 4000 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 rising above 5000 ft.

Transport wind similar to morning.

Surface wind similar to morning.

EVENING

Mixing height lowers below 1500 ft after sunset.

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

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

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

MORNING

Mixing height below 1000 ft early rising to 3000 - 4000 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 rising above 5000 ft.

Transport wind shifts to WSW to WNW at 5 - 9 mph.

Surface wind increases to WSW to WNW at 4 - 8 mph.

EVENING

Mixing height lowers below 1500 ft after sunset.

Transport wind W to NW at 4 - 8 mph.

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

OUTLOOK:

SUNDAY

Mixing height below 1000 ft early rising to 2000 to 3000 ft by late morning rising to 2900 to 3900 ft during the afternoon.  Transport wind S to SSW at 8 - 14 mph during the morning becoming SW to W at 12 - 22 mph during the afternoon.  Surface wind SSE to SW at 4 - 8 mph during the morning becoming W to NW at 9 - 15 mph during the afternoon.

MONDAY

Mixing height below 1000 ft early rising to 3000 to 4000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind NE to E at 5 - 9 mph during the morning becoming NNW to NNE 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.

TUESDAY

Mixing height below 1000 ft early rising to 2500 to 3500 ft by late morning rising to 3100 to 4100 ft during the afternoon.  Transport wind SSE to SSW at 8 - 12 mph during the morning becoming S to SSW at 12 - 24 mph during the afternoon.  Surface wind S to SW at 4 - 8 mph.

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

These instructions are valid for burning conducted on Saturday, June 5, 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.

Zone 602 and 603

Units should be 300 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.

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.  Higher tonnage is possible south of T29S.  Call the forecaster.

Zone 616 east of R9W

Units should be 750 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.  Higher tonnage is possible south of T29S.  Call the forecaster.

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.

Zone 620

Units should be 500 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.  Higher tonnage is possible south of T35S.  Call the forecaster.

Cascades

All zones except Zone 610 and 611

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 and 611

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

Siskiyous

Units should be 1000 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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