SMI West (Smoke Management Instructions) (no subject)

Tue Dec 14 14:32:41 PST 2010

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS

SALEM FORESTRY WEATHER CENTER

OREGON DEPARTMENT OF FORESTRY

ISSUED: Tuesday, December 14, 2010       2:30 PM      Jim Little

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

    WEDNESDAY

Upper air charts show a generally west to east flow with a minor upper level disturbance moving through the region during the afternoon.  This will produce showers but precipitation amounts should be light, generally less than a quarter of an inch.  The snow level will be quite low, especially in the morning.  Precipitation will fall as snow down to about 1500 feet.  Expect brisk southerly transport winds and generally fair smoke dispersal conditions throughout western Oregon.

    OUTLOOK (THURSDAY - SATURDAY)

An upper level ridge passes over the area early in the day on Thursday.  This will help stabilize the atmosphere although showers are still possible in extreme northern Oregon.  Precipitation amounts will be light.  Smoke dispersal conditions will be marginal in the north but fair in the south.  The upper ridge stalls to the east on Friday and low level flow will have an easterly component.  Transport winds will be mostly south to southeast.  Ventilation will be marginal except fair along the south coast.  By Saturday a broad upper low will develop about 450 miles west of the coastline.  This will push surges of moisture into the region from the southwest.  There is a potential for another surge of significant rain and windy conditions Saturday and Sunday.

2.  DISPERSION

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

MORNING

Mixing height 2100 - 3100 ft.

Transport wind SSW to SW at 10 - 22 mph.

Surface wind S to SW at 6 - 12 mph.

AFTERNOON

Mixing height 3000 - 4000 ft.

Transport wind increases to S to SSW at 15 - 29 mph.

Surface wind SSE to SSW at 10 - 16 mph.

EVENING

Mixing height 1800 - 2800 ft.

Transport wind S to SW at 12 - 22 mph.

Surface wind S to SW at 8 - 12 mph.

Zone 605-611 (North Cascades):

MORNING

Mixing height 1200 - 2200 ft.

Transport wind S to SW at 8 - 12 mph.

Surface wind S to SW at 8 - 12 mph.

AFTERNOON

Mixing height rising to 2600 - 3600 ft.

Transport wind S to SW at 10 - 16 mph.

Surface wind similar to morning.

EVENING

Mixing height 2500 - 3500 ft.

Transport wind SSE to SSW at 12 - 22 mph.

Surface wind SSE to SSW at 10 - 20 mph.

Zone 615-620 (South Coast Range):

MORNING

Mixing height 2000 - 3000 ft.

Transport wind S to SW at 6 - 12 mph.

Surface wind SSE to SW at 6 - 10 mph.

AFTERNOON

Mixing height 2300 - 3300 ft.

Transport wind S to SW at 10 - 16 mph.

Surface wind similar to morning.

EVENING

Mixing height 3100 - 4100 ft.

Transport wind similar to afternoon.

Surface wind similar to afternoon.

Zone 616-623 (South Cascades):

MORNING

Mixing height 1000 - 1700 ft.

Transport wind S to SW at 4 - 8 mph.

Surface wind SSE to SW at 5 - 9 mph.

AFTERNOON

Mixing height rising to 3000 - 4000 ft.

Transport wind SSE to SSW at 6 - 10 mph.

Surface wind similar to morning.

EVENING

Mixing height 1100 - 2100 ft.

Transport wind SE to SSW at 5 - 9 mph.

Surface wind SE to S at 4 - 8 mph.

OUTLOOK:

THURSDAY

Mixing height 1900 to 2900 ft throughout the day.  Transport wind SSE to SSW at 8 - 12 mph.  Surface wind SE to S at 5 - 9 mph during the morning becoming light and variable during the afternoon.

FRIDAY

Mixing height below 1000 ft during the morning rising to 2100 to 3100 ft during the afternoon.  Transport wind SSE to SSW at 8 - 12 mph.  Surface wind ENE to ESE at 4 - 8 mph.

SATURDAY

Mixing height below 1000 ft early rising to 1000 to 1800 ft by late morning rising to 3200 to 4200 ft during the afternoon.  Transport wind SSE to SSW at 8 - 12 mph.  Surface wind SSE to SSW at 4 - 8 mph.

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

These instructions are valid for burning conducted on Wednesday, December 15, 2010.

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

Coast Range

Zone 601 and 612

Units should be 1000 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.)

Zone 602 and 603

Units should be 500 tons or less, spaced 10 miles apart, and 12 miles from downwind SSRAs.  North of T3N in Zone 602, use standard guidance matrix. (See section 5 below.)  Units may be 750 tons or less, spaced 10 miles apart, south of the Siuslaw River in Zone 603.

Zone 615 and 616 west of R8W

Units should be 1500 tons or less, spaced 15 miles apart, and 15 miles from downwind SSRAs.  Higher tonnage is possible south of T29S in Zone 616.  Call the forecaster.

Zone 616 east of R9W

Units should be 750 tons or less, spaced 15 miles apart, and 15 miles from downwind SSRAs.  Higher tonnage is possible south of T29S.  Call the forecaster.

Zone 618, 619, and 620

Use standard guidance matrix. (See section 5 below.)  Ensure adequate distance from downwind SSRAs for smoke to dissipate.

Cascades

Zone 605, 606, 607, 608, 609, 610, 617, and 623

Use standard guidance matrix. (See section 5 below.)  Ensure adequate distance from downwind SSRAs for smoke to dissipate.  Verify transport winds away from SSRA if burning within 10 miles of the SSRA in Zone 605 and 606.

Zone 611 and 616

Units should be 750 tons or less, spaced 10 miles apart, and 12 miles from downwind SSRAs.  In zone 616 avoid ignitions north of T24S.  South of T29S higher tonnage is possible.  Call the forecaster.

Zone 620 and 622

Units should be 1000 tons or less, spaced 10 miles apart, and 12 miles from downwind SSRAs.

Siskiyous

Units should be 750 tons or less, spaced 10 miles apart, and 12 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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