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

Sat Apr 18 14:31:57 PDT 2009

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

ISSUED: Saturday, April 18, 2009       2:30 PM      Nick Yonker

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

Upper level ridge is building over the state today with just some variable high clouds running through the ridge.  Ridge will continue building in tonight and tomorrow with clouds dissipating.  Expect a sunny and warm day tomorrow.  Air mass will stabilize with only interior locations in southwest Oregon and east of the Cascades breaking the temperature inversion enough to have a brief period of good mixing during maximum heating.  Wind flow will be light, favoring offshore flow during the morning and onshore NW to N flow during the afternoon.  Smoke dispersion will be mostly poor.

    OUTLOOK (MONDAY - WEDNESDAY)

Upper level ridge continues to build over the state through Monday before weakening and shifting eastward on Tuesday.  Expect Monday to be the warmest day of the period with inland lowland locations reaching the upper 70s to upper 80s.  As the ridge shifts eastward on Tuesday, it will open the door to a marine push Tuesday afternoon.  Upper level trough and front move in Wednesday increasing shower activity and bringing considerably cooler air.  Air mass destabilizes Wednesday.  Look for poor to fair smoke dispersion Monday, improving dispersion Tuesday afternoon, then mostly good dispersion Wednesday.

2.  DISPERSION

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

MORNING
Mixing height below 1000 ft early rising to 1000 - 1800 ft by late morning.
Transport wind light and variable but favors N to E and controlled by local terrain.
Surface wind light and variable and controlled by local terrain.

AFTERNOON
Mixing height 1800 - 2800 ft.
Transport wind increases to NW to N at 6 - 10 mph.
Surface wind similar to morning.

EVENING
Mixing height lowers below 1000 ft.
Transport wind NNW to NNE at 6 - 12 mph.
Surface wind similar to afternoon.

Zone 605-611 (North Cascades):

MORNING
Mixing height below 1000 ft early rising to 1200 - 2200 ft by late morning.
Transport wind light and variable but favors N to E and controlled by local terrain.
Surface wind light and variable and controlled by local terrain.

AFTERNOON
Mixing height rising to 3000 - 4000 ft.
Transport wind increases to NW to N at 5 - 9 mph.
Surface wind similar to morning.

EVENING
Mixing height lowers below 1000 ft.
Transport wind NNW to NE at 6 - 12 mph.
Surface wind similar to afternoon.

Zone 615-620 (South Coast Range):

MORNING
Mixing height below 1000 ft early rising to 1000 - 2000 ft by late morning.
Transport wind light and variable but favors N to E and controlled by local terrain.
Surface wind light and variable and controlled by local terrain.

AFTERNOON
Mixing height rising to 2000 - 3000 ft.
Transport wind increases to NW to N at 5 - 9 mph.
Surface wind increases to NW to N at 6 - 12 mph.

EVENING
Mixing height lowers below 1000 ft.
Transport wind NNW to NNE at 8 - 12 mph.
Surface wind NW to N at 4 - 8 mph.

Zone 616-623 (South Cascades):

MORNING
Mixing height below 1000 ft early rising to 1500 - 2500 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 WNW to NNW at 4 - 8 mph.
Surface wind increases to NW to N at 4 - 8 mph.

EVENING
Mixing height lowers below 1000 ft.
Transport wind shifts to NNW to NNE at 6 - 10 mph.
Surface wind becomes light and variable and controlled by local terrain.

OUTLOOK:

MONDAY
Mixing height below 1000 ft early rising to 1000 to 2000 ft by late morning rising to 2800 to 3800 ft during the afternoon.  Transport wind light and variable during the morning becoming NW to NNE at 5 - 9 mph during the afternoon.  Surface wind light and variable during the morning becoming NW to N at 5 - 9 mph during the afternoon.

TUESDAY
Mixing height below 1000 ft early rising to 1800 to 2800 ft by late morning rising to 3300 to 4300 ft during the afternoon.  Transport wind NW to N at 5 - 9 mph.  Surface wind NW to N at 4 - 8 mph.

WEDNESDAY
Mixing height below 1000 ft early rising to 1500 to 2500 ft by late morning rising above 5000 ft during the afternoon.  Transport wind W to NW at 8 - 12 mph.  Surface wind WNW to NNW at 6 - 10 mph.

3.  BURNING INSTRUCTIONS FOR ALL ZONES IN THE WESTERN OREGON AREA
These instructions are valid for burning conducted on Sunday, April 19, 2009.
=================================================================

Coast Range

Zone 601, 612, and 616 east of R9W
Units should be 750 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, 606, and 616.  Avoid burning before noon in Zone 605, 606 and 616.

Zone 610
Units should be 750 tons or less, spaced 10 miles apart, and 12 miles from downwind SSRAs.

Zone 620
Units should be 500 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.  Avoid burning before 11:00 a.m.

Zone 622
Units should be 1000 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.  East of R2W, use standard guidance matrix. (See section 5 below.)  Avoid burning before 11:00 a.m.

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.

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