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

[ODF Smoke Management Instructions]

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

ISSUED: Monday, May 18, 2009       2:30 PM      Jim Little

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

The upper ridge that provided several days of sunny and warm weather to the Pacific Northwest will have moved to the northern plains states by Tuesday and an upper level low will be moving into British Columbia.  A broad upper level trough will cover Oregon and Washington.  An associated, relatively weak, cold front will move into western Oregon overnight Monday night and early Tuesday.  Rainfall amounts could amount to about three-tenths of an inch in the north and about a tenth of an inch in the south.  Rain will change to showers during the afternoon.  Transport winds will be generally west to northwest and mixing heights high enough to provide for good smoke dispersal conditions in the afternoon.

    OUTLOOK (WEDNESDAY - FRIDAY):

Temporary weak ridging will return to the region Wednesday to begin a period of generally dry weather.  Afternoon mountain showers are a possibility.  Mixing heights will lower somewhat but smoke dispersal conditions will remain good in the Cascades and fair in the coast range and SW Oregon.  By Thursday a thermal trough will develop and move into southwestern Oregon.  This will give northerly transport winds early.  As the trough shifts during the day winds will go onshore and become more northwesterly.  Friday the onshore gradients will continue with only marginal to fair smoke dispersal conditions west of I-5 but continued good conditions in the Cascades.

2.  DISPERSION

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

MORNING
Mixing height above 5000 ft.
Transport wind WSW to WNW at 10 - 20 mph.
Surface wind light and variable and controlled by local terrain.

AFTERNOON
Mixing height above 5000 ft.
Transport wind similar to morning.
Surface wind similar to morning.

EVENING
Mixing height lowers below 1000 ft after sunset.
Transport wind WSW to WNW at 8 - 12 mph.
Surface wind similar to afternoon.

Zone 605-611 (North Cascades):

MORNING
Mixing height above 5000 ft.
Transport wind SW to W at 10 - 16 mph.
Surface wind light and variable and controlled by local terrain.

AFTERNOON
Mixing height above 5000 ft.
Transport wind WSW to W at 10 - 22 mph.
Surface wind increases to W to NW at 8 - 12 mph.

EVENING
Mixing height lowers below 1000 ft after sunset.
Transport wind WSW to WNW at 10 - 16 mph.
Surface wind W to NW at 5 - 9 mph.

Zone 615-620 (South Coast Range):

MORNING
Mixing height above 5000 ft.
Transport wind WSW to NW at 6 - 10 mph.
Surface wind WNW to NNW at 4 - 8 mph.

AFTERNOON
Mixing height above 5000 ft.
Transport wind WNW to NNW at 6 - 10 mph.
Surface wind increases to W to NW at 9 - 15 mph.

EVENING
Mixing height lowers below 1000 ft after sunset.
Transport wind NW to NNE at 6 - 12 mph.
Surface wind W to NW at 6 - 10 mph.

Zone 616-623 (South Cascades):

MORNING
Mixing height above 5000 ft.
Transport wind WSW to NW at 6 - 10 mph.
Surface wind light and variable and controlled by local terrain.

AFTERNOON
Mixing height above 5000 ft.
Transport wind W to NW at 8 - 14 mph.
Surface wind increases to WNW to NNW at 10 - 18 mph.

EVENING
Mixing height lowers below 1000 ft after sunset.
Transport wind WNW to NNW at 9 - 15 mph.
Surface wind WNW to NW at 8 - 12 mph.

OUTLOOK:

WEDNESDAY
In the north mixing height below 1000 ft early rising to 2000 to 3000 ft by late morning rising to 2800 to 3800 ft during the afternoon.  In the south mixing height below 1000 ft early rising to 3300 to 4300 ft by late morning lowering to 2700 to 3700 ft during the afternoon.  Transport wind N to ENE at 4 - 8 mph.  Surface wind WSW to NW at 5 - 9 mph during the morning becoming WNW to NNW at 9 - 15 mph during the afternoon.

THURSDAY
Mixing height below 1000 ft early rising to 2400 to 3400 ft by late morning rising to 3600 to 4600 ft during the afternoon.  Transport wind light and variable during the morning becoming NNW to NNE at 4 - 8 mph during the afternoon.  Surface wind light and variable.

FRIDAY
Mixing height below 1000 ft early rising to 2400 to 3400 ft by late morning rising to 3600 to 4600 ft during the afternoon.  Transport wind light and variable during the morning becoming NNW to NNE at 5 - 9 mph during the afternoon.  Surface wind light and variable during the morning becoming NW to N 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 Tuesday, May 19, 2009.
=================================================================

Coast Range

Zone 601 and 612
Units should be 1000 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.  Restrict units in or near corridors to 500 tons or less.  North of Tillamook in Zone 601, use standard guidance matrix. (See section 5 below.)

Zone 602, 603, and 620
Units should be 500 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.  North of T3N in Zone 602, use standard guidance matrix. (See section 5 below.)  Avoid burning in or near corridors.  Units may be 750 tons or less, spaced 5 miles apart, south of the Siuslaw River in Zone 603.  Higher tonnage is possible south of T35S in Zone 620.  Call the forecaster.

Zone 615
Units should be 1500 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.

Zone 616 west of R8W
Units should be 1200 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.

Zone 616 east of R9W
Units should be 750 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.  Restrict units to 500 tons or less south of T30S.

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

Zone 619
Units should be 2000 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.


Cascades

Zone 605, 606, 607, 608, 609, 616, 617, and 623
Use standard guidance matrix. (See section 5 below.)  Ensure adequate distance from downwind SSRAs for smoke to dissipate.  From T15S through T20S in Zone 608 units should be 1000 tons or less, spaced 5 miles apart.

Zone 610, 611, and 622
Units should be 1000 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.  East of R2W in Zone 622, use standard guidance matrix. (See section 5 below.)

Zone 620
Units should be 500 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.


Siskiyous
Units should be 1500 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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