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

Sat Apr 17 14:35:34 PDT 2010

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS

SALEM FORESTRY WEATHER CENTER

OREGON DEPARTMENT OF FORESTRY

ISSUED: Saturday, April 17, 2010              2:30 PM                Jim Trost

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

Big low center aloft in the Gulf of Alaska.  However, this is far enough to the west to allow higher pressure to build over the Pacific Northwest and stabilize the air mass a bit.  As a result, mixing height is held down a bit over western Oregon.  Low is close enough to result in southerly low-level wind flow, although the speed is fairly light.  Combination of light transport and restricted mixing results in fair to good dispersion during the afternoon but marginal dispersion for the rest of the day.

    OUTLOOK (MONDAY - WEDNESDAY)

Upper low develops a sharp trough that moves toward the coast and finally cuts off a closed low center over northern California.  Precipitation returns to the area, reaching the coast after noon on Monday.  Rain spreads across the area Monday night and Tuesday.  Freezing level drops as the system moves east, so rain likely to change to snow at the higher elevations by Tuesday morning.  Transport southerly, turning west to northwest as the trough passes.  Mixing improves temporarily with the passage of the trough but the air mass stabilizes quickly behind this system.

2.  DISPERSION

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

MORNING

Mixing height 2200 - 3200 ft.

Transport wind ESE to S at 6 - 12 mph.

Surface wind E to SSE at 5 - 9 mph.

AFTERNOON

Mixing height 3200 - 4200 ft.

Transport wind SSW to WSW at 6 - 10 mph.

Surface wind SSW to WSW at 4 - 8 mph.

EVENING

Mixing height below 1000 ft.

Transport wind light and variable.

Surface wind light and variable.

Zone 605-611 (North Cascades):

MORNING

Mixing height 2500 - 3500 ft.

Transport wind ESE to SSE at 4 - 8 mph.

Surface wind light and variable.

AFTERNOON

Mixing height 3500 - 4500 ft.

Transport wind SW to W at 4 - 8 mph.

Surface wind W to NW at 4 - 8 mph.

EVENING

Mixing height below 1000 ft.

Transport wind light and variable.

Surface wind light and variable.

Zone 615-620 (South Coast Range):

MORNING

Mixing height 2700 - 3700 ft.

Transport wind SSE to SW at 6 - 10 mph.

Surface wind light and variable.

AFTERNOON

Mixing height 3400 - 4400 ft.

Transport wind SSW to WSW at 6 - 10 mph.

Surface wind SSW to WSW at 5 - 9 mph.

EVENING

Mixing height lowers below 1000 ft.

Transport wind light and variable.

Surface wind light and variable.

Zone 616-623 (South Cascades):

MORNING

Mixing height 3200 - 4200 ft.

Transport wind SSE to SSW at 4 - 8 mph.

Surface wind light and variable.

AFTERNOON

Mixing height 3800 - 4800 ft.

Transport wind SW to WNW at 4 - 8 mph.

Surface wind SW to WNW at 4 - 8 mph.

EVENING

Mixing height below 1000 ft.

Transport wind light and variable.

Surface wind light and variable.

OUTLOOK:

MONDAY

Mixing height below 1000 ft early rising to 1800 to 2800 ft by late morning and 3800 to 4800 ft during the afternoon.  Transport wind SSE to SSW at 6 - 12 mph in the morning and SW to WSW at 8 - 12 mph during the afternoon.  Surface wind SSE to SSW at 4 - 8 mph during the morning and WSW to WNW at 8 - 12 mph in the afternoon.

TUESDAY

Mixing height 1500 to 2500 ft during the morning rising to 3100 to 4100 ft in the afternoon.  Transport wind WNW to NW at 8 - 12 mph.  Surface wind light and variable.

WEDNESDAY

Mixing height below 1000 ft early rising to 2400 to 3400 ft by late morning and 3200 to 4200 ft during the afternoon.  Transport wind WNW to NNW at 4 - 8 mph.  Surface wind light and variable.

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

These instructions are valid for burning conducted on Sunday, April 18, 2010.

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NOTE: In all areas plan burning based on transport wind shifting from southerly to onshore in the afternoon.

Coast Range

Zone 601, 612, and 616 east of R9W

Units should be 750 tons or less, spaced 10 miles apart, and 12 miles from downwind SSRAs.  North of Tillamook in Zone 601, use standard guidance matrix. (See section 5 below.)  Higher tonnage is possible south of T29S in Zone 616.  Call the forecaster.

Zone 602 and 603

Units should be 300 tons or less, spaced 10 miles apart, and 12 miles from downwind SSRAs.  North of T3N in Zone 602, units may be up to 1000 tons.

Zone 615 and 620

Units should be 1500 tons or less, spaced 10 miles apart, and 12 miles from downwind SSRAs.

Zone 616 west of R8W

Units should be 1000 tons or less, spaced 10 miles apart, and 12 miles from downwind SSRAs.  Higher tonnage is possible south of T29S.  Call the forecaster.

Zone 618 and 619

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

Cascades

All zones except zone 611

Use standard guidance matrix. (See section 5 below.)  Ensure adequate distance from downwind SSRAs for smoke to dissipate.  From T18S through T22S in Zone 608, units should be 750 tons or less, spaced 10 miles apart.

Zone 611

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

Siskiyous

Units should be 1000 tons or less, spaced 8 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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