SMI West (Smoke Management Instructions) (no subject)

Tue Feb 8 13:20:57 PST 2011

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS

SALEM FORESTRY WEATHER CENTER

OREGON DEPARTMENT OF FORESTRY

ISSUED: Tuesday, February 8, 2011       2:30 PM      Jim Little

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

    WEDNESDAY

A strong upper level ridge with its axis about 400 miles offshore will shunt any Pacific storms well to the north and keep the Pacific Northwest dry through the end of the week.  At the surface a weak thermal trough extends through central California into southwest Oregon.  This will give generally northerly transport winds to the area.  Subsidence with the upper ridge will suppress maximum mixing heights and limit smoke plume development.  Smoke dispersal conditions will be marginal.

    OUTLOOK (THURSDAY - SATURDAY)

The upper ridge axis moves to within about 100 miles of the coast, further suppressing maximum mixing heights for Thursday.  Smoke dispersal conditions become poor and transport winds remain north or north-northeasterly.  On Friday the upper ridge axis moves east of the Cascades and flow aloft becomes southwesterly.  Lower level transport winds become south-southwest and increase.  Maximum mixing heights rise and smoke dispersal conditions improve to marginal.  On Saturday a Pacific cold front brings rain back to the Pacific Northwest.  Rain will spread from northwestern Oregon southward to about a line from Diamond Lake to Coos Bay.  Smoke dispersal conditions will further improve to marginal to fair.

2.  DISPERSION

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

MORNING

Mixing height 1000 - 2000 ft.

Transport wind light and variable.

Surface wind light and variable and controlled by local terrain.

AFTERNOON

Mixing height rising to 2300 - 3300 ft.

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

Surface wind similar to morning.

EVENING

Mixing height lowers below 1000 ft.

Transport wind NNE to ENE at 4 - 8 mph.

Surface wind similar to afternoon.

Zone 605-611 (North Cascades):

MORNING

Mixing height 1100 - 2100 ft.

Transport wind light and variable.

Surface wind light and variable and controlled by local terrain.

AFTERNOON

Mixing height rising to 2200 - 3200 ft.

Transport wind increases to NNW to NE at 5 - 9 mph.

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

EVENING

Mixing height lowers below 1000 ft.

Transport wind becomes light and variable.

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

Zone 615-620 (South Coast Range):

MORNING

Mixing height 1700 - 2700 ft.

Transport wind NE to E at 6 - 10 mph.

Surface wind NE to E at 5 - 9 mph.

AFTERNOON

Mixing height 2300 - 3300 ft.

Transport wind increases to NNE to NE at 8 - 14 mph.

Surface wind N to NE at 6 - 12 mph.

EVENING

Mixing height 1400 - 2400 ft.

Transport wind NE to ENE at 9 - 15 mph.

Surface wind NNE to ENE at 4 - 8 mph.

Zone 616-623 (South Cascades):

MORNING

Mixing height 1500 - 2500 ft.

Transport wind light and variable.

Surface wind light and variable and controlled by local terrain.

AFTERNOON

Mixing height 2300 - 3300 ft.

Transport wind similar to morning.

Surface wind similar to morning.

EVENING

Mixing height lowers below 1000 ft.

Transport wind similar to afternoon.

Surface wind similar to afternoon.

OUTLOOK:

THURSDAY

Mixing height below 1000 ft early rising to 1000 to 1700 ft by late morning rising to 1600 to 2600 ft during the afternoon.  Transport wind ENE to ESE at 4 - 8 mph during the morning becoming light and variable during the afternoon.  Surface wind light and variable.

FRIDAY

Mixing height below 1000 ft during the morning rising to 1700 to 2700 ft during the afternoon.  Transport wind SSE to SSW at 4 - 8 mph.  Surface wind light and variable.

SATURDAY

Mixing height 1400 to 2400 ft during the morning rising to 2400 to 3400 ft during the afternoon.  Transport wind SSE to SSW 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 Wednesday, February 9, 2011.

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

Coast Range

Zone 601, 612, 615, 616, 618, 619, and 620

Use standard guidance matrix. (See section 5 below.)  Avoid burning directly upwind of coastal SSRAs.

Zone 602 and 603

Units should be 1000 tons or less, spaced 15 miles apart, and 15 miles from downwind SSRAs.  Avoid ignitions north of Forest Grove/Hillsboro or Sheridan/Willamina in Zone 602.  Higher tonnage is possible south of T17S in Zone 603.  Call the forecaster.

Cascades

Zone 605, 606, and 616

Units should be 500 tons or less, spaced 15 miles apart, and 15 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.

Zone 607 and 608

Units should be 1000 tons or less, spaced 15 miles apart, and 15 miles from downwind SSRAs.

Zone 609, 610, 611, 617, and 623

Use standard guidance matrix. (See section 5 below.)  Ensure adequate distance from downwind SSRAs for smoke to dissipate.  South of T30S in Zone 617 units should be 500 tons or less, spaced 15 miles apart.

Zone 620 and 622

No burning allowed.

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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