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

Sun May 9 14:53:45 PDT 2010

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

ISSUED: Sunday, May 9, 2010       2:30 PM      Jim Little

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

    MONDAY

An upper level low moves into SW Oregon/Northern California during the day.  This will produce showers throughout the region with heaviest amounts in southern zones.  The air mass will be cool and snow is possible above 2500 feet in the north and 3500 feet in the south.  Subsidence on the northwest side of the low will suppress afternoon mixing heights in the north.

    OUTLOOK (TUESDAY-THURSDAY)

High pressure aloft develops offshore with the upper low tracking across Nevada and Utah on Tuesday.  Showers should decrease rapidly during the day.  A surface high noses into Oregon late in the day.  By Wednesday a thermal trough is well established in central California for a generally northerly transport wind.  Mixing heights will be down a bit Tuesday and Wednesday most areas but smoke dispersal conditions should remain at least fair most areas.  The remains of a weak Pacific front move through the area Friday which will turn flow more onshore and improve mixing heights.

2.  DISPERSION

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

MORNING
Mixing height 1600 - 2600 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 NW to NNE at 6 - 10 mph.
Surface wind increases to NW to NNE at 5 - 9 mph.

EVENING
Mixing height 1800 - 2800 ft.
Transport wind NW to NNW at 10 - 16 mph.
Surface wind WNW to NNW at 6 - 10 mph.

Zone 605-611 (North Cascades):

MORNING
Mixing height 1700 - 2700 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 NW to N at 4 - 8 mph.
Surface wind increases to NW to N at 5 - 9 mph.

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

Zone 615-620 (South Coast Range):

MORNING
Mixing height 3500 - 4500 ft.
Transport wind light and variable.
Surface wind light and variable and controlled by local terrain.

AFTERNOON
Mixing height rising above 5000 ft.
Transport wind increases to SSW to WSW at 8 - 12 mph.
Surface wind increases to SSW to WSW at 6 - 10 mph.

EVENING
Mixing height 1600 - 2600 ft.
Transport wind shifts to NW to N at 8 - 12 mph.
Surface wind shifts to NW to N at 5 - 9 mph.

Zone 616-623 (South Cascades):

MORNING
Mixing height 1000 - 1600 ft.
Transport wind light and variable.
Surface wind light and variable and controlled by local terrain.

AFTERNOON
Mixing height rising above 5000 ft.
Transport wind increases to SSW to WSW at 8 - 12 mph.
Surface wind increases to SSW to WSW at 6 - 10 mph.

EVENING
Mixing height 1200 - 2200 ft.
Transport wind shifts to WNW to NNW at 6 - 10 mph.
Surface wind shifts to WNW to NNW at 4 - 8 mph.

OUTLOOK:

TUESDAY
Mixing height 1900 to 2900 ft during the morning rising to 3100 to 4100 ft during the afternoon.  Transport wind WNW to NNW at 6 - 10 mph.  Surface wind light and variable during the morning becoming NW to N at 8 - 12 mph during the afternoon.

WEDNESDAY
Mixing height below 1000 ft early rising to 2500 to 3500 ft by late morning rising to 4100 to 5000 ft during the afternoon.  Transport wind N to NE at 5 - 9 mph.  Surface wind light and variable.

THURSDAY
Mixing height below 1000 ft early rising to 2500 to 3500 ft by late morning rising above 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming NW to NNE at 4 - 8 mph during the afternoon.  Surface wind light and variable.

3.  BURNING INSTRUCTIONS FOR ALL ZONES IN THE WESTERN OREGON AREA
These instructions are valid for burning conducted on Monday, May 10, 2010.
=================================================================

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 T17S in Zone 603.  Call the forecaster.

Zone 615, 618, 619, and 620
Use standard guidance matrix. (See section 5 below.)  Avoid burning directly upwind of the North Bend/Coos Bay SSRA.  South of T35S in Zone 620 units should be 500 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.

Zone 616 west of R8W
Units should be 1500 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.  Higher tonnage is possible south of T29S.  Call the forecaster.

Zone 616 east of R9W
Units should be 1000 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.  Higher tonnage is possible south of T29S.  Call the forecaster.

Cascades

All zones except zone 610
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.  Avoid ignitions north of T24S in Zone 616.

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

Siskiyous
Units should be 1000 tons or less, spaced 5 miles apart, and 10 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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