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

Mon May 10 14:03:27 PDT 2010

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS
SALEM FORESTRY WEATHER CENTER
OREGON DEPARTMENT OF FORESTRY

ISSUED: Monday, May 10, 2010       2:30 PM      Jim Little

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

    TUESDAY

The upper level low that swung into Northern California on Monday moves across Nevada and Utah while an upper level ridge builds off the coast. Showers are still possible, especially in the morning, and southwestern Oregon could see snow in those showers to about 3500 feet.  The proximity of the ridge will suppress mixing heights somewhat but smoke dispersal conditions should remain fair.

    OUTLOOK (WEDNESDAY-FRIDAY)

The offshore upper ridge moves over western Oregon Wednesday. This will continue to suppress mixing heights over the region although they should be high enough for fair smoke dispersal conditions most areas.  A weak upper disturbance should improve mixing heights on Thursday and another slightly stronger one will further improve smoke dispersal conditions on Friday.  Neither of these systems is likely to produce any precipitation, however.

2.  DISPERSION

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

MORNING
Mixing height 3000 - 4000 ft.
Transport wind light and variable.
Surface wind light and variable and controlled by local terrain.

AFTERNOON
Mixing height 3500 - 4500 ft.
Transport wind increases to NW to NNW at 10 - 22 mph.
Surface wind increases to WNW to NNW at 10 - 18 mph.

EVENING
Mixing height 1300 - 2300 ft.
Transport wind similar to afternoon.
Surface wind WNW to NNW at 8 - 14 mph.

Zone 605-611 (North Cascades):

MORNING
Mixing height 2400 - 3400 ft.
Transport wind light and variable.
Surface wind light and variable and controlled by local terrain.

AFTERNOON
Mixing height rising to 3500 - 4500 ft.
Transport wind increases to W to NNW at 6 - 10 mph.
Surface wind increases to W to NNW at 6 - 12 mph.

EVENING
Mixing height 1200 - 2200 ft.
Transport wind similar to afternoon.
Surface wind similar to afternoon.

Zone 615-620 (South Coast Range):

MORNING
Mixing height 2700 - 3700 ft.
Transport wind light and variable and controlled by local terrain.
Surface wind light and variable and controlled by local terrain.

AFTERNOON
Mixing height 3000 - 4000 ft.
Transport wind increases to NW to N at 9 - 15 mph.
Surface wind increases to NW to N at 9 - 15 mph.

EVENING
Mixing height 1700 - 2700 ft.
Transport wind similar to afternoon.
Surface wind similar to afternoon.

Zone 616-623 (South Cascades):

MORNING
Mixing height 2200 - 3200 ft.
Transport wind NW to N at 8 - 14 mph.
Surface wind NW to N at 8 - 14 mph.

AFTERNOON
Mixing height 2500 - 3500 ft.
Transport wind NNW to NNE at 9 - 15 mph.
Surface wind NNW to NNE at 9 - 15 mph.

EVENING
Mixing height 2000 - 3000 ft.
Transport wind N to NE at 6 - 12 mph.
Surface wind N to NE at 5 - 9 mph.

OUTLOOK:

WEDNESDAY
In the north mixing height below 1000 ft early rising to 1600 to 2600 ft by late morning rising to 3200 to 4200 ft during the afternoon.  In the south mixing height below 1000 ft early rising to 3500 to 4500 ft by late morning and through the afternoon.  Transport wind light and variable during the morning becoming NW to N at 8 - 12 mph during the afternoon.  Surface wind light and variable during the morning becoming NW to N at 8 - 12 mph during the afternoon.

THURSDAY
In the Coast Range mixing height below 1000 ft early rising to 2000 to 3000 ft by late morning lowering below 1000 ft during the afternoon.  In the Cascades mixing height below 1000 ft early rising to 4200 to 5000 ft by late morning lowering below 1000 ft during the afternoon.  Transport wind ENE to ESE at 4 - 8 mph during the morning becoming NNW to NNE at 4 - 8 mph during the afternoon.  Surface wind light and variable.

FRIDAY
In the Coast Range mixing height below 1000 ft early rising to 1800 to 2800 ft by late morning lowering below 1000 ft during the afternoon.  In the Cascades mixing height below 1000 ft early rising to 3000 to 4000 ft by late morning lowering below 1000 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, May 11, 2010.
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Coast Range

Zone 601 and 612
Units should be 750 tons or less, spaced 8 miles apart, and 10 miles from downwind SSRAs.  Restrict units in or near corridors to 500 tons or less.  Higher tonnage is possible south of Waldport in Zone 612.  Call the forecaster.

Zone 602 and 603
Units should be 300 tons or less, spaced 8 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 2000 tons or less, spaced 10 miles apart, and 12 miles from downwind SSRAs.

Zone 616 west of R8W
Units should be 1200 tons or less, spaced 10 miles apart, and 12 miles from downwind SSRAs.

Zone 616 east of R9W
Units should be 750 tons or less, spaced 10 miles apart, and 12 miles from downwind SSRAs.  Restrict units to 500 tons or less south of T30S.

Zone 618 and 619
Use standard guidance matrix. (See section 5 below.)

Zone 620
No burning allowed.  Some burning allowed south of the Rogue River.  Call the forecaster.

Cascades

Zone 605, 606, 607, 608, 609, and 611
Use standard guidance matrix. (See section 5 below.)  Ensure adequate distance from downwind SSRAs for smoke to dissipate.  From T12S through T17S in Zone 608 units should be 1000 tons or less, spaced 8 miles apart.

Zone 610
Units should be 1000 tons or less, spaced 8 miles apart, and 10 miles from downwind SSRAs.

Zone 616 and 623
Units should be 750 tons or less, spaced 10 miles apart, and 12 miles from downwind SSRAs.  South of T30S in Zone 616 units should be 500 tons or less, spaced 10 miles apart.  South of T36S in Zone 623, use standard guidance matrix. (See section 5 below.)

Zone 617
Units should be 1500 tons or less, spaced 10 miles apart, and 12 miles from downwind SSRAs.  South of T30S units should be 500 tons or less, spaced 10 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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