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

Fri May 8 14:31:49 PDT 2009

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

ISSUED: Friday, May 8, 2009       2:30 PM      Nick Yonker

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

Upper level ridge will continue to build over the state today and through the weekend bringing warmer and drier conditions.  Air mass will stabilize during the night and morning hours but daytime heating in the interior will bring a period of good mixing.  Wind flow will remain generally light northerly.  Expect mostly fair smoke dispersion.

    OUTLOOK (SUNDAY - TUESDAY)

Ridge reaches its peak over the state on Sunday bringing the warmest temperatures.  However, marine air will move in during the afternoon as a trough and minor front move in on Monday.  Front will bring some light rain to mainly the northern part of the state with a few lingering showers early Tuesday as the trough passes to the east.  Air mass will be stable Sunday morning then destabilize during the day.  Air mass will remain mostly unstable Monday and Tuesday under the influence of the trough pattern and brisk westerly flow.

2.  DISPERSION

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

MORNING
Mixing height 1700 - 2700 ft.
Transport wind NNW to NNE at 6 - 12 mph.
Surface wind NW to NNE at 5 - 9 mph.

AFTERNOON
Mixing height rising to 2800 - 3800 ft.
Transport wind similar to morning.
Surface wind similar to morning.

EVENING
Mixing height lowers below 2000 ft after sunset.
Transport wind NNW to NNE at 9 - 15 mph.
Surface wind similar to afternoon.

Zone 605-611 (North Cascades):

MORNING
Mixing height 2800 - 3800 ft.
Transport wind NNW to NNE at 4 - 8 mph.
Surface wind light and variable but favors NNW to NNE and controlled by local terrain.

AFTERNOON
Mixing height rising to 4000 - 5000 ft.
Transport wind similar to morning.
Surface wind increases to NNW to NNE at 5 - 9 mph.

EVENING
Mixing height lowers below 2000 ft after sunset.
Transport wind NNW to NNE at 8 - 12 mph.
Surface wind similar to afternoon.

Zone 615-620 (South Coast Range):

MORNING
Mixing height below 1000 ft early rising to 2200 - 3200 ft by late morning.
Transport wind NNW to NNE at 6 - 10 mph.
Surface wind NW to NNE at 5 - 9 mph.

AFTERNOON
Mixing height 3000 - 4000 ft.
Transport wind similar to morning.
Surface wind NW to N at 8 - 12 mph.

EVENING
Mixing height lowers below 2000 ft after sunset.
Transport wind similar to afternoon.
Surface wind similar to afternoon.

Zone 616-623 (South Cascades):

MORNING
Mixing height below 1000 ft early rising to 3500 - 4500 ft by late morning.
Transport wind light and variable but favors NNW to NNE.
Surface wind light and variable but favors NNW to NNE and controlled by local terrain.

AFTERNOON
Mixing height above 5000 ft.
Transport wind increases to NW to NNE at 5 - 9 mph.
Surface wind increases to NW to N at 5 - 9 mph.

EVENING
Mixing height lowers below 2000 ft after sunset.
Transport wind similar to afternoon.
Surface wind similar to afternoon.

OUTLOOK:

SUNDAY
Mixing height below 1000 ft early rising to 2000 to 3000 ft by late morning rising to 3000 to 4000 ft during the afternoon.  Transport wind light and variable during the morning becoming SW to WNW at 6 - 10 mph during the afternoon.  Surface wind light and variable during the morning becoming WSW to WNW at 6 - 10 mph during the afternoon.

MONDAY
Mixing height 3000 to 4000 ft during the morning rising above 5000 ft during the afternoon.  Transport wind WSW to WNW at 10 - 18 mph.  Surface wind WSW to WNW at 8 - 12 mph.

TUESDAY
Mixing height 4200 to 5000 ft during the morning rising above 5000 ft during the afternoon.  Transport wind SW to W at 10 - 18 mph during the morning becoming W to NW at 8 - 12 mph during the afternoon.  Surface wind SW to W at 8 - 12 mph during the morning becoming W to NW at 6 - 10 mph during the afternoon.

3.  BURNING INSTRUCTIONS FOR ALL ZONES IN THE WESTERN OREGON AREA
These instructions are valid for burning conducted on Saturday, May 9, 2009.
=================================================================

Coast Range

Zone 601 and 612
Units should be 1500 tons or less, spaced 10 miles apart, and 12 miles from downwind SSRAs.  Higher tonnage is possible south of Waldport in Zone 612.  Call the forecaster.

Zone 602 and 603
Units should be 500 tons or less, spaced 10 miles apart, and 12 miles from downwind SSRAs.  Avoid ignitions north of Forest Grove/Hillsboro or Sheridan/Willamina in Zone 602.  Higher tonnage is possible south of T17S in Zone 603.  Call the forecaster.

Zone 615
Units should be 2000 tons or less, spaced 10 miles apart, and 12 miles from downwind SSRAs.

Zone 616 west of R8W
Units should be 1200 tons or less, spaced 10 miles apart, and 12 miles from downwind SSRAs.

Zone 616 east of R9W
Units should be 750 tons or less, spaced 10 miles apart, and 12 miles from downwind SSRAs.  Restrict units to 500 tons or less south of T30S.

Zone 618 and 619
Use standard guidance matrix. (See section 5 below.)

Zone 620
No burning allowed.  Some burning allowed south of the Rogue River.  Call the forecaster.

Cascades

Zone 605, 606, and 610
Units should be 1000 tons or less, spaced 8 miles apart, and 10 miles from downwind SSRAs.  Verify transport winds away from SSRA if burning within 10 miles of the SSRA in Zone 605 and 606.  Higher tonnage is possible south of T20S in Zone 606.  Call the forecaster.

Zone 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.  South of T30S in Zone 616 units should be 500 tons or less, spaced 5 miles apart.  South of T30S in Zone 617 units should be 750 tons or less, spaced 5 miles apart.

Zone 620 and 622
Units should be 500 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.

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/20090508/33cd6658/attachment.html>