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

Fri Apr 17 14:31:26 PDT 2009

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

ISSUED: Friday, April 17, 2009       2:30 PM      Nick Yonker

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

Weak cold front and upper trough have passed to the east of the region today.  Now, the upper ridge will start building in over the weekend providing the warmest temperatures of the year.  Skies will be mostly clear.  Air mass will stabilize as temperatures warm aloft.  In addition, wind flow will become quite light and variable, leading to poor smoke dispersion.

    OUTLOOK (SUNDAY - TUESDAY)

Upper level ridge will remain firmly entrenched over the region through the period with only slight weakening on Tuesday.  Expect continued sunny skies and warm temperatures.  Mixing will remain mostly poor except for brief afternoon instability.  Also, wind flow will remain light, leading to mostly poor smoke dispersion.

2.  DISPERSION

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

MORNING
Mixing height below 1000 ft early rising to 1000 - 1800 ft by late morning.
Transport wind ENE to ESE at 5 - 9 mph.
Surface wind light and variable and controlled by local terrain.

AFTERNOON
Mixing height rising to 2000 - 3000 ft.
Transport wind becomes light and variable and controlled by local terrain.
Surface wind similar to morning.

EVENING
Mixing height lowers below 1000 ft.
Transport wind similar to afternoon.
Surface wind similar to afternoon.

Zone 605-611 (North Cascades):

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

AFTERNOON
Mixing height 3000 - 4000 ft.
Transport wind becomes light and variable and controlled by local terrain.
Surface wind similar to morning.

EVENING
Mixing height lowers below 1000 ft.
Transport wind similar to afternoon.
Surface wind similar to afternoon.

Zone 615-620 (South Coast Range):

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

AFTERNOON
Mixing height rising to 2300 - 3300 ft.
Transport wind shifts to W to NNW at 5 - 9 mph.
Surface wind increases to W to NW at 6 - 10 mph.

EVENING
Mixing height lowers below 1000 ft.
Transport wind NW to N at 5 - 9 mph.
Surface wind becomes light and variable and controlled by local terrain.

Zone 616-623 (South Cascades):

MORNING
Mixing height below 1000 ft early rising to 2000 - 3000 ft by late morning.
Transport wind light and variable and controlled by local terrain.
Surface wind light and variable and controlled by local terrain.

AFTERNOON
Mixing height rising above 5000 ft.
Transport wind increases to W to NW at 4 - 8 mph.
Surface wind increases to WNW to NNW at 4 - 8 mph.

EVENING
Mixing height lowers below 1000 ft.
Transport wind shifts to NW to NNE at 6 - 10 mph.
Surface wind becomes light and variable and controlled by local terrain.

OUTLOOK:

SUNDAY
Mixing height below 1000 ft early rising to 1800 to 2800 ft by late morning rising to 2800 to 3800 ft during the afternoon.  Transport wind light and variable during the morning becoming NW to N at 4 - 8 mph during the afternoon.  Surface wind light and variable during the morning becoming NW to N at 4 - 8 mph during the afternoon.

MONDAY
Mixing height below 1000 ft early rising to 1800 to 2800 ft by late morning rising to 3500 to 4500 ft during the afternoon.  Transport wind WNW to NNW at 4 - 8 mph.  Surface wind WNW to NNW at 4 - 8 mph.

TUESDAY
Mixing height below 1000 ft early rising to 1800 to 2800 ft by late morning rising to 3300 to 4300 ft during the afternoon.  Transport wind WNW to NNW at 6 - 10 mph.  Surface wind NW to N at 6 - 10 mph.

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

Coast Range

Zone 601, 612, and 616 east of R9W
Units should be 500 tons or less, spaced 15 miles apart, and 15 miles from downwind SSRAs.

Zone 602, 603, and 620
No burning allowed.  Some burning allowed south of T35S in Zone 620.  Call the forecaster.

Zone 615 and 616 west of R8W
Units should be 750 tons or less, spaced 15 miles apart, and 15 miles from downwind SSRAs.

Zone 618 and 619
Units should be 1000 tons or less, spaced 15 miles apart, and 15 miles from downwind SSRAs.

Cascades

Zone 605 and 606
Units should be 300 tons or less, spaced 10 miles apart, and 12 miles from downwind SSRAs.

Zone 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 750 tons or less, spaced 10 miles apart.

Zone 610 and 611
Units should be 1000 tons or less, spaced 10 miles apart, and 12 miles from downwind SSRAs.

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

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

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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