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

Sat May 30 14:29:21 PDT 2009

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

ISSUED: Saturday, May 30, 2009       2:30 PM      Nick Yonker

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

Upper level ridge will weaken over the next couple of days as an upper low approaches from the southwest and a trough drops down from the north.  Southerly flow aloft will continue the thundershower threat over the Siskiyous, Cascades and to the east.  Air mass will remain stable and smoke dispersion mainly poor due to little wind movement.  Wind flow has turned lightly onshore and this will reduce temperatures a few degrees.  Otherwise expect mostly fair skies.

    OUTLOOK (MONDAY - WEDNESDAY)

Upper level trough moves in closer on Monday and increases the chance of showers or thundershowers over the west side of the Cascades.  This threat will continue and move further north on Tuesday.  Air mass cools and destabilizes.  As the low approaches wind flow becomes more erratic and starts turning offshore.  Upper low will continue spinning around to the south into Wednesday.  However, it appears it will have less of an influence on our weather with showers decreasing.  Air mass will stabilize some.

2.  DISPERSION

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

MORNING
Mixing height below 1000 ft early rising to 1800 - 2800 ft by late morning.
Transport wind light and variable but favors S to W and controlled by local terrain.
Surface wind light and variable but favors S to W and controlled by local terrain.

AFTERNOON
Mixing height 2200 - 3200 ft.
Transport wind increases to SW to WNW at 6 - 10 mph.
Surface wind increases to SSW to W at 4 - 8 mph.

EVENING
Mixing height lowers below 1000 ft after sunset.
Transport wind similar to afternoon.
Surface wind becomes light and variable but favors S to W and controlled by local terrain.

Zone 605-611 (North Cascades):

MORNING
Mixing height below 1000 ft early rising to 2300 - 3300 ft by late morning.
Transport wind light and variable but favors SW to NW and controlled by local terrain.
Surface wind light and variable 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 5 - 9 mph.

EVENING
Mixing height lowers below 1500 ft after sunset.
Transport wind shifts to SW to WNW at 6 - 12 mph.
Surface wind becomes light and variable and controlled by local terrain.

Zone 615-620 (South Coast Range):

MORNING
Mixing height below 1000 ft early rising to 1800 - 2800 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 2700 - 3700 ft.
Transport wind increases to WSW to WNW at 6 - 10 mph.
Surface wind increases to W to NW at 6 - 10 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 1000 ft early rising to 3000 - 4000 ft by late morning.
Transport wind light and variable but favors W to NW 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 6 - 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.

OUTLOOK:

MONDAY
In the north mixing height below 1000 ft early, rising to 2000 to 3000 ft by late morning rising to 2800 to 3800 ft during the afternoon.  In the south mixing height below 1000 ft early rising to 2800 to 3800 ft by late morning and through the afternoon.  Transport wind light and variable during the morning becoming NW to N at 6 - 10 mph during the afternoon.  Surface wind light and variable during the morning becoming NW to N at 5 - 9 mph during the afternoon.

TUESDAY
In the north mixing height below 1000 ft early, rising to 2800 to 3800 ft by late morning rising to 4000 to 5000 ft during the afternoon.  In the south mixing height below 1000 ft early rising to 2800 to 3800 ft by late morning rising to 4200 to 5000 ft during the afternoon.  Transport wind ENE to ESE at 4 - 8 mph during the morning becoming NNW to NNE at 4 - 8 mph during the afternoon.  Surface wind light and variable.

WEDNESDAY
In the north mixing height below 1000 ft early, rising to 1800 to 2800 ft by late morning rising to 2500 to 3500 ft during the afternoon.  In the south mixing height below 1000 ft early rising to 2500 to 3500 ft by late morning rising to 4000 to 5000 ft during the afternoon.  Transport wind ENE to ESE at 4 - 8 mph during the morning becoming WNW to NNW at 4 - 8 mph during the afternoon.  Surface wind light and variable during the morning becoming WNW to NNW at 4 - 8 mph during the afternoon.

3.  BURNING INSTRUCTIONS FOR ALL ZONES IN THE WESTERN OREGON AREA
These instructions are valid for burning conducted on Sunday, May 31, 2009.
=================================================================

Coast Range

Zone 601 and 612
Units should be 500 tons or less, spaced 15 miles apart, and 15 miles from downwind SSRAs.  North of Tillamook in Zone 601, use standard guidance matrix. (See section 5 below.)

Zone 602 and 603
No burning allowed.  North of T3N in Zone 602, use standard guidance matrix. (See section 5 below.)  Avoid burning in or near corridors.  Units may be 500 tons or less, spaced 15 miles apart, south of the Siuslaw River in Zone 603.

Zone 615 and 616 west of R8W
Units should be 1000 tons or less, spaced 10 miles apart, and 12 miles from downwind SSRAs.  Higher tonnage is possible south of T29S in Zone 616.  Call the forecaster.

Zone 616 east of R9W
Units should be 500 tons or less, spaced 10 miles apart, and 12 miles from downwind SSRAs.  Higher tonnage is possible south of T29S.  Call the forecaster.

Zone 618
Units should be 2000 tons or less, spaced 10 miles apart, and 12 miles from downwind SSRAs.

Zone 619
Units should be 1500 tons or less, spaced 10 miles apart, and 12 miles from downwind SSRAs.

Zone 620
No burning allowed.  Some burning allowed south of T35S.  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 750 tons or less, spaced 10 miles apart.

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.

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.)

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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