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

Thu Jun 18 14:27:40 PDT 2009

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

ISSUED: Thursday, June 18, 2009       2:30 PM      Nick Yonker

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

Upper level trough and minor disturbance are rapidly moving toward the state this afternoon - ahead of schedule.  This disturbance will increase the marine layer overnight and likely bring some light rain to the region beginning tomorrow morning.  Air mass will be mostly unstable, and with decent onshore flow, will make for good to excellent smoke dispersion.

    OUTLOOK (SATURDAY - MONDAY)

The trough from Friday's disturbance will move through early Saturday but will be quickly followed by another disturbance and trough Saturday afternoon.  This trough will bring more showers into the area and even cooler temperatures as the snow level drops to near 6000 ft.  Trough will move by to the east Sunday and Monday with the air mass drying and warming.  Expect good mixing and smoke dispersion through the period.

2.  DISPERSION

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

MORNING
Mixing height 4000 - 5000 ft.
Transport wind SW to W at 8 - 12 mph.
Surface wind SSW to WSW at 8 - 12 mph.

AFTERNOON
Mixing height above 5000 ft.
Transport wind increases to W to NW at 12 - 24 mph.
Surface wind shifts to W to NW at 9 - 15 mph.

EVENING
Mixing height remains above 5000 ft.
Transport wind similar to afternoon.
Surface wind similar to afternoon.

Zone 615-620 (South Coast Range):

MORNING
Mixing height 3700 - 4700 ft.
Transport wind WNW to NW at 8 - 14 mph.
Surface wind NW to NNW at 8 - 14 mph.

AFTERNOON
Mixing height above 5000 ft.
Transport wind WNW to NNW at 10 - 16 mph.
Surface wind similar to morning.

EVENING
Mixing height remains above 5000 ft.
Transport wind similar to afternoon.
Surface wind NW to N at 9 - 15 mph.

Zone 616-623 (South Cascades):

MORNING
Mixing height above 5000 ft.
Transport wind WSW to NW at 5 - 9 mph.
Surface wind WNW to NNW at 4 - 8 mph.

AFTERNOON
Mixing height above 5000 ft.
Transport wind WNW to NW at 8 - 14 mph.
Surface wind increases to WNW to NNW at 9 - 15 mph.

EVENING
Mixing height remains above 5000 ft.
Transport wind similar to afternoon.
Surface wind NW to NNW at 8 - 12 mph.

OUTLOOK:

SATURDAY
Mixing height above 5000 ft throughout the day.  Transport wind WNW to NNW at 5 - 9 mph.  Surface wind light and variable during the morning becoming WNW to NNW at 6 - 12 mph during the afternoon.

SUNDAY
Mixing height above 5000 ft throughout the day.  Transport wind NW to N at 6 - 10 mph.  Surface wind WNW to NNW at 5 - 9 mph.

MONDAY
Mixing height 3200 to 4200 ft during the morning rising above 5000 ft during the afternoon.  Transport wind NNW to NNE at 6 - 12 mph.  Surface wind NNW to NNE at 6 - 10 mph.

3.  BURNING INSTRUCTIONS FOR ALL ZONES IN THE WESTERN OREGON AREA
These instructions are valid for burning conducted on Friday, June 19, 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.

Zone 602, 603, and 620
Units should be 500 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.  Avoid burning in or near corridors.  Higher tonnage is possible south of the Siuslaw River in Zone 603.  Call the forecaster.  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, 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 622
Units should be 1000 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.)

Zone 620
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/20090618/ee7bdea3/attachment.html>