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

Fri Apr 24 14:27:58 PDT 2009

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

ISSUED: Friday, April 24, 2009       2:30 PM      Nick Yonker

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

Cool, NW'erly flow aloft will remain over the region through this weekend.  A minor disturbance will move through the flow but expect mostly just clouds with a chance of some scattered showers.  Air mass will remain mostly unstable and wind flow mainly NW'erly.  Expect continued good smoke dispersion.

    OUTLOOK (SUNDAY - TUESDAY)

Upper level flow turns more northerly aloft through the period.  An upper low will drop southward on Monday and increase the chance of showers mainly on Tuesday.  Air mass will remain mostly unstable during the day with minor stability at night.  Wind flow will turn a little more northerly.

2.  DISPERSION

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

MORNING
Mixing height below 3000 ft early rising above 5000 ft by late morning.
Transport wind W to NW at 10 - 22 mph.
Surface wind WSW to WNW at 8 - 14 mph.

AFTERNOON
Mixing height above 5000 ft.
Transport wind similar to morning.
Surface wind W to NW at 8 - 14 mph.

EVENING
Mixing height remains above 5000 ft.
Transport wind decreases to WNW to NNW at 9 - 15 mph.
Surface wind WNW to NNW at 5 - 9 mph.

Zone 615-620 (South Coast Range):

MORNING
Mixing height below 3000 ft early rising to 4100 - 5000 ft by late morning.
Transport wind NW to NNW at 9 - 15 mph.
Surface wind WNW to NNW at 6 - 10 mph.

AFTERNOON
Mixing height above 5000 ft.
Transport wind similar to morning.
Surface wind NW to NNW at 9 - 15 mph.

EVENING
Mixing height remains above 5000 ft.
Transport wind similar to afternoon.
Surface wind NW to NNE at 6 - 12 mph.

Zone 616-623 (South Cascades):

MORNING
Mixing height below 3000 ft early rising to 3700 - 4700 ft by late morning.
Transport wind W to NW at 6 - 10 mph.
Surface wind WNW to NNW at 5 - 9 mph.

AFTERNOON
Mixing height above 5000 ft.
Transport wind WNW to NNW at 10 - 16 mph.
Surface wind WNW to NNW at 8 - 14 mph.

EVENING
Mixing height remains above 5000 ft.
Transport wind similar to afternoon.
Surface wind NW to N at 6 - 12 mph.

OUTLOOK:

SUNDAY
Mixing height 3000 to 4000 ft during the morning rising above 5000 ft during the afternoon.  Transport wind NNW to NNE at 5 - 9 mph.  Surface wind light and variable during the morning becoming NW to N at 6 - 12 mph during the afternoon.

MONDAY
Mixing height below 1000 ft early rising to 4000 to 5000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind N to NE at 9 - 15 mph.  Surface wind light and variable during the morning becoming NNW to NNE at 8 - 12 mph during the afternoon.

TUESDAY
Mixing height below 1000 ft early rising above 5000 ft by late morning and through the afternoon.  Transport wind NW to N at 6 - 12 mph.  Surface wind NW to N at 4 - 8 mph.

3.  BURNING INSTRUCTIONS FOR ALL ZONES IN THE WESTERN OREGON AREA
These instructions are valid for burning conducted on Saturday, April 25, 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 300 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 and 619
Use standard guidance matrix. (See section 5 below.)

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 300 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/20090424/838a0a28/attachment.html>