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

Sat May 8 14:28:50 PDT 2010

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS

SALEM FORESTRY WEATHER CENTER

OREGON DEPARTMENT OF FORESTRY

ISSUED: Saturday, May 8, 2010       2:30 PM      Pete Parsons

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

    SUNDAY

A split-flow jet stream pattern will send another upper-level trough across mainly the southern two-thirds of Oregon.  Scattered showers are likely in the southern zones with a chance of mainly mountain showers in the northern zones.  Mixing should be fair to good from the late morning through the afternoon with generally westerly transport winds.

    OUTLOOK (MONDAY-WEDNESDAY)

A cold upper-level trough will bring showery and cooler conditions Monday.  Snow levels will drop below 4000 feet.  Showers will be more numerous over southwestern Oregon with higher elevations likely picking up a few inches of snow. Transport winds should take on more of a southerly component, Monday morning, possibly shifting to northwesterly late in the day. The flow aloft is forecast to become northerly Tuesday, as an upper-level ridge builds just offshore.  That should rapidly taper off the shower activity with the onshore flow beginning to turn more northerly.  Wednesday looks dry with mostly northerly transport winds and fair to good mixing heights.

2.  DISPERSION

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

MORNING

Mixing height below 1000 ft early rising to 4000 - 5000 ft by late morning.

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

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

AFTERNOON

Mixing height above 5000 ft.

Transport wind increases to WSW to WNW at 10 - 20 mph.

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

EVENING

Mixing height lowers below 2000 ft after sunset.

Transport wind decreases to WSW to WNW at 6 - 12 mph.

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

Zone 615-620 (South Coast Range):

MORNING

Mixing height below 1000 ft early rising to 3600 - 4600 ft by late morning.

Transport wind W to NW at 4 - 8 mph.

Surface wind WNW to NNW at 4 - 8 mph.

AFTERNOON

Mixing height 4000 - 5000 ft.

Transport wind increases to WSW to WNW at 10 - 16 mph.

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

EVENING

Mixing height lowers below 2000 ft after sunset.

Transport wind WSW to WNW at 8 - 12 mph.

Surface wind W to NW at 6 - 10 mph.

Zone 616-623 (South Cascades):

MORNING

Mixing height below 1000 ft early rising to 3000 - 4000 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 3500 - 4500 ft.

Transport wind WSW to WNW at 8 - 14 mph.

Surface wind W to NW at 8 - 12 mph.

EVENING

Mixing height lowers below 2000 ft after sunset.

Transport wind similar to afternoon.

Surface wind similar to afternoon.

OUTLOOK:

MONDAY

Mixing height 2000 to 3000 ft during the morning rising above 5000 ft during the afternoon.  Transport wind SSE to SSW at 10 - 16 mph during the morning becoming W to NW at 10 - 18 mph during the afternoon.  Surface wind SE to S at 6 - 10 mph during the morning becoming W to NW at 8 - 12 mph during the afternoon.

TUESDAY

Mixing height below 1000 ft early rising to 2000 to 3000 ft by late morning rising to 4400 to 5000 ft during the afternoon.  Transport wind NW to NNW at 10 - 16 mph.  Surface wind NW to N at 8 - 12 mph.

WEDNESDAY

Mixing height below 1000 ft early rising to 2500 to 3500 ft by late morning rising above 5000 ft during the afternoon.  Transport wind NNW to NNE at 6 - 12 mph.  Surface wind N to NE at 4 - 8 mph.

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

These instructions are valid for burning conducted on Sunday, May 9, 2010.

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

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 500 tons or less, spaced 5 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

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, 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 and 611

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

Zone 620

Units should be 1000 tons or less, spaced 8 miles apart, and 10 miles from downwind SSRAs.

Siskiyous

Units should be 1500 tons or less, spaced 8 miles apart, and 10 miles from downwind SSRAs.

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

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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