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

Thu May 28 14:29:20 PDT 2009

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

ISSUED: Thursday, May 28, 2009       2:30 PM      Nick Yonker

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

Upper level ridge will remain over the region through tomorrow with the axis near the Oregon/Idaho border.  Expect continued sunny skies and warm temperatures.  Some convective buildups will form over the Cascades, giving a chance of some late afternoon to evening thundershowers there.  Air mass will remain mostly stable with afternoon heating providing a brief period of good mixing over inland locations.  Wind flow will remain light and favor a generally northerly direction.  Smoke dispersion will be poor to fair.

    OUTLOOK (SATURDAY - MONDAY)

Upper level ridge remains over the region and to the east through the weekend, gradually weakening and allowing an upper low to approach for Monday.  Expect continued sunny skies and warm temperatures with a chance of afternoon to evening thundershowers over the Cascades.  Air mass will continue stable during the night and morning hours with some instability during the afternoon.  Wind flow will also remain light leaving the region under poor to fair smoke dispersion.

2.  DISPERSION

Zone 601, 602, 603, 612 and 615-620 (North and South Coast Range):

MORNING
Mixing height below 1000 ft early rising to 1000 - 2000 ft by late morning.
Transport wind NW to NNE at 6 - 10 mph.
Surface wind NW to N at 4 - 8 mph.

AFTERNOON
Mixing height rising to 2000 - 3000 ft.
Transport wind NW to N at 9 - 15 mph.
Surface wind NW to NNW at 8 - 12 mph.

EVENING
Mixing height lowers below 1500 ft after sunset.
Transport wind similar to afternoon.
Surface wind WNW to NNW at 6 - 12 mph.

Zone 605-611 (North Cascades):

MORNING
Mixing height below 1000 ft early rising to 1700 - 2700 ft by late morning.
Transport wind light and variable but favors NW to NNE and controlled by local terrain.
Surface wind light and variable but favors NW to NNE and controlled by local terrain.

AFTERNOON
Mixing height rising to 3500 - 4500 ft.
Transport wind increases to NW to N at 8 - 12 mph.
Surface wind increases to NW to NNE at 6 - 12 mph.

EVENING
Mixing height 3000 - 4000 ft.
Transport wind similar to afternoon.
Surface wind similar to afternoon.

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 NW to N at 6 - 12 mph.
Surface wind increases to WNW to NNW at 6 - 10 mph.

EVENING
Mixing height 3000 - 4000 ft.
Transport wind NW to N at 6 - 10 mph.
Surface wind similar to afternoon.

OUTLOOK:

SATURDAY
In the Coast Range mixing height below 1000 ft early, rising to 1000 to 2000 ft by late morning rising to 1500 to 2500 ft during the afternoon.  In the Cascades mixing height below 1000 ft early, rising to 2000 to 3000 ft by late morning rising to 4000 to 5000 ft during the afternoon.  Transport wind NNW to NNE at 4 - 8 mph.  Surface wind light and variable during the morning becoming NW to N at 8 - 12 mph during the afternoon.

SUNDAY
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 WNW to NNW at 5 - 9 mph during the afternoon.  Surface wind light and variable during the morning becoming WNW to NNW at 4 - 8 mph during the afternoon.

MONDAY
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 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 Friday, May 29, 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.  Higher tonnage is possible south of Waldport in Zone 612.  Call the forecaster.

Zone 602, 603, and 620
No burning allowed.  Some burning is possible south of T17S in Zone 603.  Call the forecaster.  Some burning allowed south of the Rogue River in Zone 620.  Call the forecaster.

Zone 615
Units should be 1500 tons or less, spaced 15 miles apart, and 15 miles from downwind SSRAs.

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

Cascades

Zone 605, 606, 607, 608, 609, 611, 616, 617, and 623
Use standard guidance matrix. (See section 5 below.)  Ensure adequate distance from downwind SSRAs for smoke to dissipate.  Verify transport winds away from SSRA if burning within 10 miles of the SSRA in Zone 605 and 606.  South of T30S in Zone 616 units should be 500 tons or less, spaced 5 miles apart.

Zone 610
Units should be 1000 tons or less, spaced 8 miles apart, and 10 miles from downwind SSRAs.

Zone 620 and 622
Units should be 500 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.)

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.

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://omls.oregon.gov/pipermail/smi_west/attachments/20090528/aefabf38/attachment.html>