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

Mon May 11 15:02:20 PDT 2009

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

ISSUED: Monday, May 11, 2009       2:30 PM      Jim Little

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

A fairly deep upper low for this time of year will move west to east across Washington on Tuesday.  The associated cool upper trough sweeps across Oregon during the day.  This will produce showers, mainly in northern sections.  Low level flow will be west to northwest.  The cool air aloft will keep mixing heights high for good to excellent smoke dispersal conditions.

    OUTLOOK (WEDNESDAY-FRIDAY):

The area will see weak ridging early then a weak upper trough will move through overnight Wednesday.  While the upper trough is weak at there will be plenty of moisture available for a good wetting rain.  Rain will spread into western Oregon during the afternoon Wednesday.  Transport winds will be southeast to south in the north and south-southwest to west in the south.  Mixing heights will remain favorable for good smoke dispersal.  The trough pushes east on Thursday and higher pressure begins to build.  Showers will end.  By Friday ridging aloft will give dry weather to the region.  Mixing heights will deteriorate Friday but still high enough for fair to good smoke dispersal conditions.

2.  DISPERSION

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

MORNING
Mixing height above 5000 ft.
Transport wind SW to W at 12 - 24 mph.
Surface wind SSW to WSW at 9 - 15 mph.

AFTERNOON
Mixing height above 5000 ft.
Transport wind WSW to WNW at 10 - 18 mph.
Surface wind SW to WNW at 6 - 12 mph.

EVENING
Mixing height 1800 - 2800 ft.
Transport wind SW to W at 8 - 12 mph.
Surface wind becomes light and variable and controlled by local terrain.

Zone 605-611 (North Cascades):

MORNING
Mixing height above 5000 ft.
Transport wind WSW to W at 14 - 28 mph.
Surface wind SW to W at 8 - 12 mph.

AFTERNOON
Mixing height above 5000 ft.
Transport wind WSW to W at 12 - 22 mph.
Surface wind W to NW at 9 - 15 mph.

EVENING
Mixing height 2900 - 3900 ft.
Transport wind WSW to WNW at 9 - 15 mph.
Surface wind WNW to NNW at 5 - 9 mph.

Zone 615-620 (South Coast Range):

MORNING
Mixing height above 5000 ft.
Transport wind WSW to WNW at 6 - 12 mph.
Surface wind W to NW at 5 - 9 mph.

AFTERNOON
Mixing height above 5000 ft.
Transport wind W to NW at 5 - 9 mph.
Surface wind WNW to NNW at 6 - 10 mph.

EVENING
Mixing height remains above 5000 ft.
Transport wind becomes light and variable and controlled by local terrain.
Surface wind NW to N at 5 - 9 mph.

Zone 616-623 (South Cascades):

MORNING
Mixing height above 5000 ft.
Transport wind WSW to WNW at 9 - 15 mph.
Surface wind WNW to NW at 9 - 15 mph.

AFTERNOON
Mixing height above 5000 ft.
Transport wind W to NW at 8 - 14 mph.
Surface wind similar to morning.

EVENING
Mixing height remains above 5000 ft.
Transport wind W to NNW at 6 - 10 mph.
Surface wind NW to N at 6 - 10 mph.

OUTLOOK:

WEDNESDAY
In the north mixing height below 1000 ft early rising to 1300 to 2300 ft by late morning rising to 4300 to 5000 ft during the afternoon.  In the south 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 SSE to SSW at 6 - 10 mph during the morning becoming SSW to SW at 15 - 25 mph during the afternoon.  Surface wind light and variable during the morning becoming SSW to WSW at 8 - 14 mph during the afternoon.

THURSDAY
Mixing height below 1000 ft early rising to 1800 to 2800 ft by late morning rising to 4000 to 5000 ft during the afternoon.  Transport wind SW to WSW at 10 - 18 mph.  Surface wind SW to WSW at 10 - 16 mph.

FRIDAY
Mixing height below 1000 ft early rising to 1500 to 2500 ft by late morning rising to 3000 to 4000 ft during the afternoon.  Transport wind light and variable during the morning becoming NW to N at 6 - 12 mph during the afternoon.  Surface wind light and variable during the morning becoming NW to N at 6 - 12 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 12, 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, 622, 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 620
Units should be 1000 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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