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

Wed Jun 23 14:27:38 PDT 2010

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

ISSUED: Wednesday, June 23, 2010       2:30 PM      Nick Yonker

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

Weak troughing will reside over the region tomorrow maintaining some marine clouds over the coastal regions, and inland over mainly the northern part of the state.  Air mass will be somewhat stable during the morning, then destabilize during the afternoon.  Expect mostly seasonal temperatures.  Smoke dispersion will be fair to good.

    OUTLOOK (FRIDAY - SUNDAY)

Upper level trough will remain over the region through Friday with a weak disturbance moving through the flow.  Expect mainly just a thickening of the marine layer.  Little to no moisture is likely.  Upper level ridge will then move in Saturday and may give a brief period of offshore flow Saturday morning, mainly south.  Ridge moves by to the east Sunday with a slow increase in onshore flow.  Air mass will remain generally dry and stable over the weekend.  Smoke dispersion should be mostly good Friday, then worsen Saturday and Sunday.

2.  DISPERSION

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

MORNING
Mixing height below 2000 ft early rising to 2200 - 3200 ft by late morning.
Transport wind W to NW at 4 - 8 mph.
Surface wind light and variable but favors W to NW.

AFTERNOON
Mixing height rising to 3500 - 4500 ft.
Transport wind W to NW at 8 - 12 mph.
Surface wind increases to WNW to NNW at 5 - 9 mph.

EVENING
Mixing height lowers below 2000 ft after sunset.
Transport wind WSW to NW at 6 - 12 mph.
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 WSW to NW at 4 - 8 mph.
Surface wind light and variable but favors W to NW.

AFTERNOON
Mixing height rising above 5000 ft.
Transport wind W to NW at 8 - 12 mph.
Surface wind increases to W to NNW at 5 - 9 mph.

EVENING
Mixing height lowers below 2000 ft after sunset.
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 2000 - 3000 ft by late morning.
Transport wind NNW to NNE at 4 - 8 mph.
Surface wind light and variable but favors NW to NNE and controlled by local terrain.

AFTERNOON
Mixing height rising to 3500 - 4500 ft.
Transport wind NW to N at 8 - 12 mph.
Surface wind increases to NW to N at 8 - 12 mph.

EVENING
Mixing height lowers below 2000 ft after sunset.
Transport wind similar to afternoon.
Surface wind WNW to NNW at 5 - 9 mph.

Zone 616-623 (South Cascades):

MORNING
Mixing height below 2000 ft early rising to 3500 - 4500 ft by late morning.
Transport wind light and variable but favors NW to N.
Surface wind light and variable but favors NW to N.

AFTERNOON
Mixing height rising above 5000 ft.
Transport wind increases to NW to N at 6 - 10 mph.
Surface wind increases to WNW to NNW at 4 - 8 mph.

EVENING
Mixing height lowers below 2000 ft after sunset.
Transport wind WNW to NNW at 5 - 9 mph.
Surface wind similar to afternoon.

OUTLOOK:

FRIDAY
Mixing height 2500 to 3500 ft during the morning rising above 5000 ft during the afternoon.  Transport wind W to NW at 6 - 12 mph.  Surface wind W to NNW at 5 - 9 mph.

SATURDAY
Mixing height below 1000 ft early rising to 2500 to 3500 ft by late morning rising to 3500 to 4500 ft during the afternoon.  Transport wind NNW to NNE at 6 - 12 mph.  Surface wind light and variable during the morning becoming NW to N at 6 - 10 mph during the afternoon.

SUNDAY
Mixing height below 1000 ft early rising to 2500 to 3500 ft by late morning rising to 3300 to 4300 ft during the afternoon.  Transport wind WNW to NNW at 4 - 8 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 Thursday, June 24, 2010.
=================================================================

Coast Range

Zone 601, 612, and 616 east of R9W
Units should be 750 tons or less, spaced 8 miles apart, and 10 miles from downwind SSRAs.  Restrict units in or near corridors to 500 tons or less.  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 8 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.

Zone 615
Units should be 1500 tons or less, spaced 8 miles apart, and 10 miles from downwind SSRAs.

Zone 616 west of R8W
Units should be 1000 tons or less, spaced 8 miles apart, and 10 miles from downwind SSRAs.

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

Zone 620
Units should be 500 tons or less, spaced 8 miles apart, and 10 miles from downwind SSRAs.  Higher tonnage is possible 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.  From T12S through T17S in Zone 608 units should be 1000 tons or less, spaced 5 miles apart.  South of T30S in Zone 616 units should be 500 tons or less, spaced 5 miles apart.

Zone 610
Units should be 1000 tons or less, spaced 5 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.  East of R2W in Zone 622, use standard guidance matrix. (See section 5 below.)

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.

Nick Yonker
Meteorology Manager
Oregon Department of Forestry
503-945-7451

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