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

Thu Jun 25 14:28:54 PDT 2009

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

ISSUED: Thursday, June 25, 2009       2:30 PM      Nick Yonker

****Due to the lack of burning this will be the last forecast and instruction for the spring burning season.  In addition, the smoke management office will switch from 7-day-a-week operations to Monday through Friday, 0630 - 1700.  If you plan to burn while we're not writing forecasts and instructions, please call us at 503-945-7401 to coordinate.  We will resume regular written forecasts in the fall when burning increases again.****

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

Upper level trough will move through overnight bringing continued cloud cover and a chance of some light showers west of the Cascades.  Upper level ridge will start building into the state on Friday with clouds dissipating and giving way to afternoon sunshine.  Air mass will generally remain unstable except for some night and early morning stability.  Wind flow will be mostly NW to N as surface high pressure builds in.  Wind speeds will be mostly light and lead to fair to good smoke dispersion.

    OUTLOOK (SATURDAY - MONDAY)

Upper ridge continues building in over the state early Saturday before shifting eastward by the next trough in the eastern Pacific.  Saturday will be the warmest day of the period with inland locations getting into the 80s and 90s.  Next trough will probably initiate a late Saturday marine push and bring low clouds into the inland valleys on Sunday.  The trough will remain over the state through Monday keeping low clouds over the region during the night and morning hours but breaking up some during the day.  Smoke dispersion will be fair on Saturday, and then improve Sunday and Monday.

2.  DISPERSION

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

MORNING
Mixing height below 2000 ft early rising to 3000 - 4000 ft by late morning.
Transport wind NW to N at 6 - 12 mph.
Surface wind NW to N at 6 - 10 mph.

AFTERNOON
Mixing height 3000 - 4000 ft.
Transport wind NW to NNW at 9 - 15 mph.
Surface wind WNW to NNW at 6 - 10 mph.

EVENING
Mixing height 1500 - 2500 ft.
Transport wind similar to afternoon.
Surface wind similar to afternoon.

Zone 605-611 (North Cascades):

MORNING
Mixing height below 2000 ft early rising to 2500 - 3500 ft by late morning.
Transport wind NW to N at 6 - 10 mph.
Surface wind NW to NNE at 5 - 9 mph.

AFTERNOON
Mixing height rising to 4300 - 5000 ft.
Transport wind similar to morning.
Surface wind NW to N at 8 - 12 mph.

EVENING
Mixing height 3500 - 4500 ft.
Transport wind similar to afternoon.
Surface wind similar to afternoon.

Zone 615-620 (South Coast Range):

MORNING
Mixing height below 2000 ft early rising to 2500 - 3500 ft by late morning.
Transport wind NNW to NE at 6 - 10 mph.
Surface wind NW to N at 6 - 12 mph.

AFTERNOON
Mixing height 2800 - 3800 ft.
Transport wind NNW to NNE at 9 - 15 mph.
Surface wind NW to N at 10 - 18 mph.

EVENING
Mixing height 1500 - 2500 ft.
Transport wind similar to afternoon.
Surface wind similar to afternoon.

Zone 616-623 (South Cascades):

MORNING
Mixing height below 2000 ft early rising to 3200 - 4200 ft by late morning.
Transport wind light and variable but favors NW to N.
Surface wind light and variable but favors WNW to NNW.

AFTERNOON
Mixing height rising above 5000 ft.
Transport wind increases to NW to N at 8 - 12 mph.
Surface wind increases to NW to NNW at 8 - 12 mph.

EVENING
Mixing height 3500 - 4500 ft.
Transport wind NNW to NNE at 8 - 12 mph.
Surface wind NW to N at 8 - 14 mph.

OUTLOOK:

SATURDAY
In the Coast Range mixing height below 1000 ft early, rising to 1000 to 1800 ft by late morning rising to 2000 to 3000 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 NNE to ENE at 5 - 9 mph during the morning becoming NNW to NNE at 8 - 12 mph during the afternoon.  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 2200 to 3200 ft by late morning rising to 3000 to 4000 ft during the afternoon.  Transport wind NW to NNW at 8 - 12 mph.  Surface wind light and variable during the morning becoming NW to N at 8 - 14 mph during the afternoon.

MONDAY
Mixing height below 1000 ft early rising to 2200 to 3200 ft by late morning rising to 4200 to 5000 ft during the afternoon.  Transport wind N to NE at 9 - 15 mph.  Surface wind NNW to NNE at 8 - 12 mph.

3.  BURNING INSTRUCTIONS FOR ALL ZONES IN THE WESTERN OREGON AREA
These instructions are valid for burning conducted on Friday, June 26, 2009.
=================================================================

Coast Range

Zone 601, 612, and 616 east of R9W
Units should be 750 tons or less, spaced 10 miles apart, and 12 miles from downwind SSRAs.  Restrict units in or near corridors to 500 tons or less.  Higher tonnage is possible south of Waldport in Zone 612.  Call the forecaster.  Restrict units to 500 tons or less south of T30S in Zone 616.

Zone 602 and 603
Units should be 300 tons or less, spaced 10 miles apart, and 12 miles from downwind SSRAs.  Avoid burning in or near corridors.  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 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, 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.  South of T30S in Zone 617 units should be 750 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.

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/20090625/ca7773aa/attachment.html>