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

Sat Oct 31 14:27:31 PDT 2009

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

ISSUED: Saturday, October 31, 2009       2:30 PM      Nick Yonker

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

Cold front moved by to the east this morning and will give way to a fairly flat upper level ridge tomorrow.  Air mass will slowly stabilize overnight as skies clear.  Some patchy fog is likely in the inland valleys Sunday morning.  Surface high pressure will build to the north and turn wind flow offshore.  This should make for some decent burn opportunities in the Coast Range.  Smoke dispersion, however, will be mostly poor to fair.

    OUTLOOK (MONDAY - WEDNESDAY)

Upper ridge will remain in place Monday and Tuesday keeping the air mass stable and smoke dispersion poor.  Expect some morning fog in the valleys with clearing skies during the afternoon.  A minor front will bring increasing clouds and a chance of rain to mainly the northern part of the region Wednesday afternoon.  Air mass will remain stable but increasing SW'erly flow will improve smoke dispersion then.

2.  DISPERSION

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

MORNING
Mixing height below 1000 ft early rising to 1500 - 2500 ft by late morning.
Transport wind N to NE at 5 - 9 mph.
Surface wind light and variable but favors N to E and controlled by local terrain.

AFTERNOON
Mixing height 2500 - 3500 ft.
Transport wind NNE to ENE at 8 - 12 mph.
Surface wind increases to NNE to ENE at 6 - 12 mph.

EVENING
Mixing height lowers below 1000 ft.
Transport wind similar to afternoon.
Surface wind NNE to ENE at 4 - 8 mph.

Zone 605-611 (North Cascades):

MORNING
Mixing height below 1000 ft early rising to 2000 - 3000 ft by late morning.
Transport wind N to NE at 4 - 8 mph.
Surface wind light and variable but favors N to E and controlled by local terrain.

AFTERNOON
Mixing height 2800 - 3800 ft.
Transport wind N to NE at 8 - 14 mph.
Surface wind increases to N to NE at 8 - 12 mph.

EVENING
Mixing height lowers below 1000 ft.
Transport wind shifts to NE to E at 6 - 12 mph.
Surface wind shifts to NE to E at 4 - 8 mph.

Zone 615-620 (South Coast Range):

MORNING
Mixing height below 1000 ft early rising to 1300 - 2300 ft by late morning.
Transport wind NNE to ENE at 6 - 12 mph.
Surface wind NE to E at 6 - 10 mph.

AFTERNOON
Mixing height 2000 - 3000 ft.
Transport wind NE to ENE at 10 - 16 mph.
Surface wind NE to ENE at 8 - 14 mph.

EVENING
Mixing height lowers below 1000 ft.
Transport wind NNE to ENE at 8 - 12 mph.
Surface wind NNE to ENE at 5 - 9 mph.

Zone 616-623 (South Cascades):

MORNING
Mixing height below 1000 ft early rising to 1000 - 2000 ft by late morning.
Transport wind light and variable but favors NE to E.
Surface wind light and variable but favors N to E and controlled by local terrain.

AFTERNOON
Mixing height 1700 - 2700 ft.
Transport wind increases to NE to E at 4 - 8 mph.
Surface wind similar to morning.

EVENING
Mixing height lowers below 1000 ft.
Transport wind becomes light and variable but favors NE to E.
Surface wind similar to afternoon.

OUTLOOK:

MONDAY
Mixing height below 1000 ft early rising to 1000 to 2000 ft by late morning rising to 1700 to 2700 ft during the afternoon.  Transport wind light and variable during the morning becoming WNW to NNW at 4 - 8 mph during the afternoon.  Surface wind light and variable.

TUESDAY
Mixing height below 1000 ft early rising to 1000 to 1700 ft by late morning and through the afternoon.  Transport wind light and variable during the morning becoming NW to N at 6 - 10 mph during the afternoon.  Surface wind light and variable during the morning becoming NNW to NNE at 5 - 9 mph during the afternoon.

WEDNESDAY
Mixing height below 1000 ft early rising to 1000 to 1700 ft by late morning rising to 1500 to 2500 ft during the afternoon.  Transport wind W to NW at 4 - 8 mph during the morning becoming SW to W at 10 - 16 mph during the afternoon.  Surface wind light and variable during the morning becoming S to SW at 4 - 8 mph during the afternoon.

3.  BURNING INSTRUCTIONS FOR ALL ZONES IN THE WESTERN OREGON AREA
These instructions are valid for burning conducted on Sunday, November 1, 2009.
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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 and 606
Units should be 300 tons or less, spaced 10 miles apart, and 12 miles from downwind SSRAs.  Higher tonnage is possible south of T20S in Zone 606.  Call the forecaster.

Zone 607 and 608
Units should be 1500 tons or less, spaced 10 miles apart, and 12 miles from downwind SSRAs.

Zone 609, 610, and 611
Use standard guidance matrix. (See section 5 below.)  Ensure adequate distance from downwind SSRAs for smoke to dissipate.

Zone 616, 617, 620, 622, and 623
Units should be 500 tons or less, spaced 15 miles apart, and 15 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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