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

Thu Apr 16 14:26:29 PDT 2009

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

ISSUED: Thursday, April 16, 2009       2:30 PM      Nick Yonker

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

Minor upper level ridge is shifting to the east this afternoon and making way for a weak front to move into the state tonight and early tomorrow.  Moisture will move onto the coast tonight and spread inland overnight.  Moisture will be mostly light.  Front will move to the east tomorrow late morning to afternoon.  Air mass will destabilize as cooler air moves in aloft.  Other than brief morning stability, mixing should be mostly good, as well as smoke dispersion.

    OUTLOOK (SATURDAY - MONDAY)

Following Friday's front and minor trough, the upper level ridge will build in strongly over the weekend.  Expect considerable warming through the period.  Air mass stabilizes during the night and early morning hours but daytime heating will provide decent mixing during the afternoon over inland locations.  Wind flow will be mostly light offshore, then turn onshore Monday as the ridge drifts eastward and allows the next front to approach.

2.  DISPERSION

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

MORNING
Mixing height below 3000 ft early rising to 3500 - 4500 ft by late morning.
Transport wind SW to W at 8 - 12 mph.
Surface wind SSW to WSW at 5 - 9 mph.

AFTERNOON
Mixing height above 5000 ft.
Transport wind WSW to WNW at 8 - 12 mph.
Surface wind shifts to WSW to NW at 5 - 9 mph.

EVENING
Mixing height lowers below 2000 ft after sunset.
Transport wind W to NW at 4 - 8 mph.
Surface wind becomes light and variable and controlled by local terrain.

Zone 605-611 (North Cascades):

MORNING
Mixing height below 3000 ft early rising above 5000 ft by late morning.
Transport wind SW to W at 8 - 12 mph.
Surface wind light and variable and controlled by local terrain.

AFTERNOON
Mixing height above 5000 ft.
Transport wind WSW to WNW at 8 - 12 mph.
Surface wind increases to WSW to NW at 4 - 8 mph.

EVENING
Mixing height lowers below 2000 ft after sunset.
Transport wind W to NW at 5 - 9 mph.
Surface wind becomes light and variable and controlled by local terrain.

Zone 615-620 (South Coast Range):

MORNING
Mixing height below 2000 ft early rising to 4000 - 5000 ft by late morning.
Transport wind W to NW at 8 - 12 mph.
Surface wind light and variable but favors SW to NW and controlled by local terrain.

AFTERNOON
Mixing height above 5000 ft.
Transport wind NW to N at 5 - 9 mph.
Surface wind increases to WNW to NNW at 6 - 10 mph.

EVENING
Mixing height lowers below 3000 ft after sunset.
Transport wind NNW to NNE at 5 - 9 mph.
Surface wind becomes light and variable but favors SW to NW and controlled by local terrain.

Zone 616-623 (South Cascades):

MORNING
Mixing height below 2000 ft early rising above 5000 ft by late morning.
Transport wind WSW to NW at 6 - 10 mph.
Surface wind light and variable but favors SW to NW and controlled by local terrain.

AFTERNOON
Mixing height above 5000 ft.
Transport wind W to NW at 5 - 9 mph.
Surface wind increases to WNW to NNW at 4 - 8 mph.

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

OUTLOOK:

SATURDAY
In the Coast Range mixing height below 1000 ft early, rising to 1000 to 2000 ft by late morning and through the afternoon.  In the Cascades mixing height below 1000 ft early rising to 2200 to 3200 ft by late morning rising to 3500 to 4500 ft during the afternoon.  Transport wind ENE to ESE at 4 - 8 mph during the morning becoming NW to N at 4 - 8 mph during the afternoon.  Surface wind light and variable during the morning becoming NW to N at 4 - 8 mph during the afternoon.

SUNDAY
Mixing height below 1000 ft early rising to 1800 to 2800 ft by late morning rising to 3200 to 4200 ft during the afternoon.  Transport wind light and variable during the morning becoming NNW to NNE at 6 - 10 mph during the afternoon.  Surface wind NNW to NE at 4 - 8 mph.

MONDAY
Mixing height below 1000 ft early rising to 1800 to 2800 ft by late morning rising to 3500 to 4500 ft during the afternoon.  Transport wind W to NW at 6 - 12 mph.  Surface wind WNW to NNW at 4 - 8 mph.

3.  BURNING INSTRUCTIONS FOR ALL ZONES IN THE WESTERN OREGON AREA
These instructions are valid for burning conducted on Friday, April 17, 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, 603, and 620
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.  Higher tonnage is possible south of T35S in Zone 620.  Call the forecaster.

Zone 615
Units should be 1500 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.

Zone 616 west of R8W
Units should be 1200 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.

Zone 616 east of R9W
Units should be 750 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.  Restrict units to 500 tons or less south of T30S.

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

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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