SMI West (Smoke Management Instructions) (no subject)

Mon Apr 18 13:58:24 PDT 2011

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS

SALEM FORESTRY WEATHER CENTER

OREGON DEPARTMENT OF FORESTRY

ISSUED: Monday, April 18, 2011       2:30 PM      Jim Little

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

    TUESDAY

Upper level flow will be light west-northwesterly over the region on Tuesday with an upper level jet lying across the southern half of the state.  Moisture is limited but the air mass remains cold for this time of year.  This will produce high maximum mixing heights and good smoke dispersal conditions.

    OUTLOOK (WEDNESDAY - FRIDAY)

The upper level jet slips south by Wednesday keeping cool conditions aloft over the region.  Mixing heights will remain high for good smoke dispersal conditions.  A weak disturbance in the upper flow will produce precipitation with the snow level down to around 3000 feet in the north to 4000 feet in the south.  Transport winds will be mostly northwesterly except light and variable in the south.

By Thursday an upper level disturbance swings in from the northwest and phases with a weak disturbance coming across the Pacific to carve out a trough over the Pacific Northwest. This will produce light precipitation most areas.  The cool air mass will mean snow at higher elevations but also good smoke dispersal conditions.  On Friday expect weak ridging aloft for dry weather but light and variable transport winds.  A thermal trough develops in California and extends northward to off the Oregon coast for offshore flow many areas west of the Cascades.

2.  DISPERSION

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

MORNING

Mixing height 4000 - 5000 ft.

Transport wind light and variable.

Surface wind light and variable and controlled by local terrain.

AFTERNOON

Mixing height above 5000 ft.

Transport wind increases to N to NE at 8 - 12 mph.

Surface wind increases to N to NE at 8 - 12 mph.

EVENING

Mixing height remains above 5000 ft.

Transport wind similar to afternoon.

Surface wind NNW to NE at 4 - 8 mph.

Zone 605-611 (North Cascades):

MORNING

Mixing height 3700 - 4700 ft.

Transport wind NW to NNE at 4 - 8 mph.

Surface wind NW to NNE at 5 - 9 mph.

AFTERNOON

Mixing height above 5000 ft.

Transport wind NNW to NE at 6 - 12 mph.

Surface wind N to NE at 8 - 12 mph.

EVENING

Mixing height 1400 - 2400 ft.

Transport wind NNE to NE at 8 - 12 mph.

Surface wind N to NE at 6 - 10 mph.

Zone 615-620 (South Coast Range):

MORNING

Mixing height 4000 - 5000 ft.

Transport wind NNE to ENE at 9 - 15 mph.

Surface wind NNE to ENE at 9 - 15 mph.

AFTERNOON

Mixing height above 5000 ft.

Transport wind increases to N to NE at 6 - 12 mph.

Surface wind N to NE at 8 - 12 mph.

EVENING

Mixing height 3500 - 4500 ft.

Transport wind NNW to NNE at 8 - 12 mph.

Surface wind NNW to NNE at 5 - 9 mph.

Zone 616-623 (South Cascades):

MORNING

Mixing height 3800 - 4800 ft.

Transport wind light and variable.

Surface wind light and variable and controlled by local terrain.

AFTERNOON

Mixing height above 5000 ft.

Transport wind increases to W to NNW at 4 - 8 mph.

Surface wind increases to WNW to NNW at 5 - 9 mph.

EVENING

Mixing height lowers below 1000 ft.

Transport wind NW to N at 4 - 8 mph.

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

OUTLOOK:

WEDNESDAY

Mixing height below 1000 ft early rising to 1600 to 2600 ft by late morning rising to 4300 to 5000 ft during the afternoon.  In the Coast Range transport wind NNW to NNE at 5 - 9 mph during the morning becoming NW to NNW at 10 - 22 mph during the afternoon.  In the Cascades transport wind WSW to WNW at 4 - 8 mph.  Surface wind light and variable during the morning becoming WNW to NNW at 8 - 12 mph during the afternoon.

THURSDAY

Mixing height below 1000 ft early rising to 3200 to 4200 ft by late morning rising to 4400 to 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming NW to N at 4 - 8 mph during the afternoon.  Surface wind light and variable.

FRIDAY

Mixing height below 1000 ft early rising to 1800 to 2800 ft by late morning rising to 3800 to 4800 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.

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

These instructions are valid for burning conducted on Tuesday, April 19, 2011.

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

Coast Range

All Zones

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

Cascades

Zone 605, 606, and 622

Units should be 1000 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.  Verify transport winds away from SSRA if burning within 10 miles of the SSRA in Zone 605 and 606.  Higher tonnage is possible south of T20S in Zone 606.  Call the forecaster.  East of R2W in Zone 622, use standard guidance matrix. (See section 5 below.)

Zone 607 and 608

Units should be 2000 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.

Zone 609, 610, 611, 616, 617, and 623

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

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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