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

Thu Dec 17 14:31:47 PST 2009

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

ISSUED: Thursday, December 17, 2009       2:30 PM      Nick Yonker

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

Upper level ridge is building over the region today as a warm front moves in from the coast.  Expect light amounts of moisture mostly west of the Cascade crest.  Cold front will follow overnight tonight and Friday, but again, moisture amounts will be light.  Front will do little to the upper ridge which will quickly pop up again Friday evening.  Air mass will remain mostly stable, especially south, with fair smoke dispersion.

    OUTLOOK (SATURDAY - MONDAY)

Next warm front will move into the ridge beginning Saturday with light moisture beginning during the day.  Cold front and trough will approach on Sunday increasing the moisture and wind.  The first cold front should move through Sunday night with a second one moving in Monday.  In addition, the upper level trough will move in Monday night.  Air mass will be quite stable Saturday with poor smoke dispersion.  Mixing and dispersion improve Sunday and Monday.

2.  DISPERSION

Zone 601-612 (North Coast Range and Cascades):

MORNING
Mixing height below 2000 ft early rising to 2300 - 3300 ft by late morning.
Transport wind SSW to WSW at 6 - 12 mph.
Surface wind light and variable and controlled by local terrain.

AFTERNOON
Mixing height rising to 4000 - 5000 ft.
Transport wind SW to WNW at 4 - 8 mph.
Surface wind similar to morning.

EVENING
Mixing height 2800 - 3800 ft.
Transport wind becomes light and variable but favors SSW to WSW.
Surface wind similar to afternoon.

Zone 615-620 (South Coast Range):

MORNING
Mixing height below 2000 ft early rising to 2800 - 3800 ft by late morning.
Transport wind SW to W at 6 - 12 mph.
Surface wind light and variable and controlled by local terrain.

AFTERNOON
Mixing height lowering to 1700 - 2700 ft.
Transport wind becomes light and variable and controlled by local terrain.
Surface wind similar to morning.

EVENING
Mixing height 1000 - 1800 ft.
Transport wind similar to afternoon.
Surface wind similar to afternoon.

Zone 616-623 (South Cascades):

MORNING
Mixing height below 2000 ft early rising to 2000 - 3000 ft by late morning.
Transport wind SSW to WSW at 6 - 10 mph.
Surface wind light and variable and controlled by local terrain.

AFTERNOON
Mixing height 2000 - 3000 ft.
Transport wind SW to WNW at 5 - 9 mph.
Surface wind similar to morning.

EVENING
Mixing height 1300 - 2300 ft.
Transport wind becomes light and variable and controlled by local terrain.
Surface wind similar to afternoon.

OUTLOOK:

SATURDAY
Mixing height below 1000 ft early rising to 1000 to 1800 ft by late morning rising to 1500 to 2500 ft during the afternoon.  Transport wind light and variable during the morning becoming SSE to SSW at 6 - 10 mph during the afternoon.  Surface wind light and variable.

SUNDAY
Mixing height 1800 to 2800 ft during the morning rising to 3000 to 4000 ft during the afternoon.  Transport wind S to SSW at 18 - 30 mph.  Surface wind SSE to SSW at 10 - 18 mph.

MONDAY
Mixing height 3000 to 4000 ft during the morning rising to 4200 to 5000 ft during the afternoon.  Transport wind S to SSW at 22 - 40 mph during the morning becoming SW to WSW at 16 - 30 mph during the afternoon.  Surface wind S to SSW at 12 - 24 mph during the morning becoming SW to WSW at 10 - 18 mph during the afternoon.

3.  BURNING INSTRUCTIONS FOR ALL ZONES IN THE WESTERN OREGON AREA
These instructions are valid for burning conducted on Friday, December 18, 2009.
=================================================================

Coast Range

Zone 601 and 612
Units should be 750 tons or less, spaced 8 miles apart, and 10 miles from downwind SSRAs.  North of Tillamook in Zone 601, use standard guidance matrix. (See section 5 below.)

Zone 602 and 603
Units should be 300 tons or less, spaced 8 miles apart, and 10 miles from downwind SSRAs.  North of T3N in Zone 602, use standard guidance matrix. (See section 5 below.)  Units may be 750 tons or less, spaced 8 miles apart, south of the Siuslaw River in Zone 603.

Zone 615 and 616 west of R8W
Units should be 1000 tons or less, spaced 15 miles apart, and 15 miles from downwind SSRAs.  Higher tonnage is possible south of T29S in Zone 616.  Call the forecaster.

Zone 616 east of R9W
Units should be 750 tons or less, spaced 15 miles apart, and 15 miles from downwind SSRAs.  Higher tonnage is possible south of T29S.  Call the forecaster.

Zone 618 and 619
Units should be 1500 tons or less, spaced 15 miles apart, and 15 miles from downwind SSRAs.

Zone 620
Units should be 500 tons or less, spaced 15 miles apart, and 15 miles from downwind SSRAs.

Cascades

All zones except zone 611
Use standard guidance matrix. (See section 5 below.)  Ensure adequate distance from downwind SSRAs for smoke to dissipate.

Zone 611
Units should be 1000 tons or less, spaced 8 miles apart, and 10 miles from downwind SSRAs.

Siskiyous
Units should be 750 tons or less, spaced 15 miles apart, and 15 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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