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

Wed Jun 17 14:25:43 PDT 2009

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

ISSUED: Wednesday, June 17, 2009       2:30 PM      Nick Yonker

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

Flat upper level ridge will build over the state tonight following this morning's weak disturbance.  Expect continued morning low clouds with a little more clearing and warming during the afternoon.  Air mass will be mostly unstable except for brief early morning stability.  Wind flow will remain light and onshore, providing fair to good smoke dispersion.

    OUTLOOK (FRIDAY - SUNDAY)

Next trough and disturbance moves in early Friday bringing increased clouds and a chance of some light showers.  A stronger trough moves in Saturday bringing even cooler air along with scattered showers.  Trough will slowly move by to the east Sunday.  Expect cool, moist, and unstable conditions but rainfall will be fairly limited.  Smoke dispersion will be good to excellent.

2.  DISPERSION

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

MORNING
Mixing height below 3000 ft early rising to 4200 - 5000 ft by late morning.
Transport wind light and variable but favors SW to NW and controlled by local terrain.
Surface wind light and variable but favors SW to NW and controlled by local terrain.

AFTERNOON
Mixing height above 5000 ft.
Transport wind increases to W to NW at 6 - 12 mph.
Surface wind increases to W to NW at 5 - 9 mph.

EVENING
Mixing height lowers below 3000 ft after sunset.
Transport wind W to NNW at 6 - 10 mph.
Surface wind similar to afternoon.

Zone 605-611 (North Cascades):

MORNING
Mixing height below 3000 ft early rising above 5000 ft by late morning.
Transport wind light and variable but favors SW to NW and controlled by local terrain.
Surface wind light and variable but favors SW to NW and controlled by local terrain.

AFTERNOON
Mixing height above 5000 ft.
Transport wind increases to W to NW at 8 - 12 mph.
Surface wind increases to WNW to NNW at 6 - 10 mph.

EVENING
Mixing height lowers below 3000 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 2500 - 3500 ft by late morning.
Transport wind light and variable but favors WNW to NNW.
Surface wind light and variable but favors W to NW and controlled by local terrain.

AFTERNOON
Mixing height rising to 3500 - 4500 ft.
Transport wind increases to WNW to NNW at 6 - 10 mph.
Surface wind increases to WNW to NNW at 6 - 12 mph.

EVENING
Mixing height lowers below 3000 ft after sunset.
Transport wind WNW to NNW at 6 - 10 mph.
Surface wind NW to N at 6 - 10 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 W to NW.
Surface wind light and variable but favors W to NW and controlled by local terrain.

AFTERNOON
Mixing height rising above 5000 ft.
Transport wind increases to W to NW at 5 - 9 mph.
Surface wind increases to WNW to NNW at 6 - 12 mph.

EVENING
Mixing height lowers below 3000 ft after sunset.
Transport wind WNW to NNW at 8 - 12 mph.
Surface wind NW to N at 6 - 12 mph.

OUTLOOK:

FRIDAY
In the Coast Range mixing height below 1000 ft early, rising to 2200 to 3200 ft by late morning rising above 5000 ft during the afternoon.  In the Cascades mixing height below 1000 ft early, rising to 4000 to 5000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind NW to N at 4 - 8 mph.  Surface wind light and variable during the morning becoming WNW to NNW at 8 - 14 mph during the afternoon.

SATURDAY
Mixing height above 5000 ft throughout the day.  Transport wind WNW to NNW at 6 - 10 mph.  Surface wind WNW to NNW at 4 - 8 mph.

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.

3.  BURNING INSTRUCTIONS FOR ALL ZONES IN THE WESTERN OREGON AREA
These instructions are valid for burning conducted on Thursday, June 18, 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 and 603
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.

Zone 615
Units should be 1200 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 616 east of R9W and 620
Units should be 500 tons or less, spaced 8 miles apart, and 10 miles from downwind SSRAs.  Higher tonnage is possible south of T35S in Zone 620.  Call the forecaster.

Zone 618
Units should be 2000 tons or less, spaced 8 miles apart, and 10 miles from downwind SSRAs.

Zone 619
Units should be 1500 tons or less, spaced 8 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
Units should be 1500 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.

==============================================================
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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