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

Tue Jun 22 06:38:38 PDT 2010

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

ISSUED: Monday, June 21, 2010       2:30 PM      Jim Little

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

    TUESDAY

A weak upper level ridge slowly moves east over the region during the day on Tuesday. Low level flow will be mostly onshore for clouds on the coast and just partly cloudy skies in the interior.  Coastal temperatures will generally be 3-5 degrees below average while interior locations will see temperatures near to about 5 degrees above average.  Cooler surface temperatures in the coastal zones will hold afternoon mixing heights down a bit while interior locations should see fair smoke dispersal conditions and areas east of I5 will see good conditions.

    OUTLOOK (WEDNESDAY-FRIDAY)

The weak upper ridge moves east and is replaced by southwesterly flow aloft on Wednesday.  Low level flow remains onshore.  Coastal temperatures remain 3-5 degrees below average while interior locations will be near average.  A disturbance in the SW flow aloft may produce afternoon thunderstorms over the Cascades.  Mixing heights will rise high enough to give fair to good smoke dispersal conditions.  Thursday will see a broad trough over the area but moisture will be limited.  Expect mostly cloudy skies most areas.  Smoke dispersal conditions will be fair along the coast and fair to good elsewhere.  On Friday the broad tough moves to the east and a cool northwesterly flow aloft develops.  Temperatures will generally be 5 to 8 degrees below average with smoke dispersal conditions similar to Thursday.

2.  DISPERSION

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

MORNING
Mixing height 1400 - 2400 ft.
Transport wind light and variable.
Surface wind light and variable and controlled by local terrain.

AFTERNOON
Mixing height rising to 3300 - 4300 ft.
Transport wind increases to NW to N at 6 - 12 mph.
Surface wind increases to NW to N at 5 - 9 mph.

EVENING
Mixing height lowers below 1000 ft.
Transport wind NNW to NNE at 6 - 12 mph.
Surface wind becomes light and variable and controlled by local terrain.

Zone 605-611 (North Cascades):

MORNING
Mixing height 2200 - 3200 ft.
Transport wind WNW to NNW at 6 - 10 mph.
Surface wind WNW to NNW at 6 - 10 mph.

AFTERNOON
Mixing height rising to 3700 - 4700 ft.
Transport wind NW to N at 5 - 9 mph.
Surface wind NW to N at 6 - 10 mph.

EVENING
Mixing height 1300 - 2300 ft.
Transport wind N to NE at 4 - 8 mph.
Surface wind becomes light and variable and controlled by local terrain.

Zone 615-620 (South Coast Range):

MORNING
Mixing height 2500 - 3500 ft.
Transport wind N to NE at 5 - 9 mph.
Surface wind NNW to NE at 5 - 9 mph.

AFTERNOON
Mixing height 3500 - 4500 ft.
Transport wind increases to NW to N at 8 - 12 mph.
Surface wind NW to N at 8 - 12 mph.

EVENING
Mixing height 1400 - 2400 ft.
Transport wind becomes light and variable.
Surface wind becomes light and variable and controlled by local terrain.

Zone 616-623 (South Cascades):

MORNING
Mixing height 3500 - 4500 ft.
Transport wind light and variable.
Surface wind WNW to NNW at 4 - 8 mph.

AFTERNOON
Mixing height rising above 5000 ft.
Transport wind increases to NW to N at 6 - 12 mph.
Surface wind NW to N at 8 - 12 mph.

EVENING
Mixing height 2900 - 3900 ft.
Transport wind NNW to NNE at 8 - 12 mph.
Surface wind NNW to NNE at 6 - 12 mph.

OUTLOOK:

WEDNESDAY
In the Coast Range mixing height below 1000 ft early rising to 2300 to 3300 ft by late morning rising to 3500 to 4500 ft during the afternoon.  In the Cascades mixing height below 1000 ft early rising to 1700 to 2700 ft by late morning rising to 4200 to 5000 ft during the afternoon.  Transport wind N to NE at 4 - 8 mph during the morning becoming WNW to NNW at 6 - 12 mph during the afternoon.  Surface wind light and variable during the morning becoming WNW to NNW at 6 - 12 mph during the afternoon.

THURSDAY
In the Coast Range mixing height below 1000 ft early rising to 1500 to 2500 ft by late morning rising to 3200 to 4200 ft during the afternoon.  In the Cascades mixing height below 1000 ft early rising to 3200 to 4200 ft by late morning rising to 4000 to 5000 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.

FRIDAY
In the Coast Range mixing height below 1000 ft early rising to 1900 to 2900 ft by late morning rising to 3200 to 4200 ft during the afternoon.  In the Cascades mixing height below 1000 ft early rising to 2800 to 3800 ft by late morning rising to 4200 to 5000 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, June 22, 2010.
=================================================================

Coast Range

Zone 601 and 612
Units should be 750 tons or less, spaced 10 miles apart, and 12 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 10 miles apart, and 12 miles from downwind SSRAs.  Avoid burning in or near corridors.  Higher tonnage is possible south of T17S in Zone 603.  Call the forecaster.

Zone 615
Units should be 2000 tons or less, spaced 8 miles apart, and 10 miles from downwind SSRAs.

Zone 616 west of R8W
Units should be 1200 tons or less, spaced 8 miles apart, and 10 miles from downwind SSRAs.

Zone 616 east of R9W
Units should be 750 tons or less, spaced 8 miles apart, and 10 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
Units should be 500 tons or less, spaced 8 miles apart, and 10 miles from downwind SSRAs.  Higher tonnage is possible south of the Rogue River.  Call the forecaster.

Cascades

Zone 605, 606, 607, 608, 609, 611, 616, 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.  South of T30S in Zone 616 units should be 500 tons or less, spaced 5 miles apart.  South of T30S in Zone 617 units should be 750 tons or less, spaced 5 miles apart.

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

Zone 620 and 622
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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