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

Wed Apr 8 14:38:10 PDT 2009

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

ISSUED: Wednesday, April 8, 2009       2:30 PM      Nick Yonker

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

Upper level low is moving off to the east today after providing moisture to mainly the southern part of the state.  The next upper trough and cold front will move in tomorrow morning bringing more moisture.  Cold front will pass through between the early afternoon and evening.  Air mass will remain unstable and smoke dispersion decent under light to moderate wind flow.

    OUTLOOK (FRIDAY - SUNDAY)

Upper level trough moves through Friday as it dives to the south into California.  Expect some lingering showers in the cool, unstable air mass.  Snow level will be around 3500 - 4000 ft.  Minor ridge builds in Saturday but will not warm the air mass too much.  Skies will remain mostly cloudy.  Next stronger front and trough arrive Sunday bringing a good dose of moisture and wind.  Mixing and smoke dispersion will remain good to excellent through the period.

2.  DISPERSION

Zone 601-612 (North Coast Range and Cascades):

MORNING
Mixing height above 5000 ft.
Transport wind S to SW at 10 - 20 mph.
Surface wind SSE to SSW at 5 - 9 mph.

AFTERNOON
Mixing height above 5000 ft.
Transport wind SSW to SW at 9 - 15 mph.
Surface wind S to SW at 4 - 8 mph.

EVENING
Mixing height remains above 5000 ft.
Transport wind SSW to WSW at 6 - 10 mph.
Surface wind becomes light and variable but favors S to SW.

Zone 615-623 (South Coast Range and Cascades):

MORNING
Mixing height above 5000 ft.
Transport wind SSW to WSW at 10 - 16 mph.
Surface wind S to SW at 5 - 9 mph.

AFTERNOON
Mixing height above 5000 ft.
Transport wind SW to W at 8 - 14 mph.
Surface wind shifts to SW to WNW at 4 - 8 mph.

EVENING
Mixing height remains above 5000 ft.
Transport wind WSW to WNW at 6 - 10 mph.
Surface wind becomes light and variable but favors SW to W.

OUTLOOK:

FRIDAY
Mixing height above 5000 ft throughout the day.  Transport wind light and variable during the morning becoming W to NW at 6 - 10 mph during the afternoon.  Surface wind light and variable during the morning becoming W to NW at 6 - 10 mph during the afternoon.

SATURDAY
Mixing height above 5000 ft throughout the day.  Transport wind SSW to WSW at 10 - 16 mph.  Surface wind S to SW at 8 - 12 mph.

SUNDAY
Mixing height 2800 to 3800 ft during the morning rising above 5000 ft during the afternoon.  Transport wind SW to WSW at 25 - 45 mph during the morning becoming WSW to W at 15 - 30 mph during the afternoon.  Surface wind S to SSW at 10 - 22 mph during the morning becoming SW to W at 10 - 20 mph during the afternoon.

3.  BURNING INSTRUCTIONS FOR ALL ZONES IN THE WESTERN OREGON AREA
These instructions are valid for burning conducted on Thursday, April 9, 2009.
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Coast Range

Zone 601, 612, and 615
Units should be 1500 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.  North of Tillamook in Zone 601, use standard guidance matrix. (See section 5 below.)

Zone 602, 603, and 616 east of R9W
Units should be 750 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.  North of T3N in Zone 602, use standard guidance matrix. (See section 5 below.)  Higher tonnage is possible south of T29S in Zone 616.  Call the forecaster.

Zone 616 west of R8W
Units should be 1200 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.  Higher tonnage is possible south of T29S.  Call the forecaster.

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

Zone 619
Units should be 2000 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.

Zone 620
Units should be 500 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.  Higher tonnage is possible south of T35S.  Call the forecaster.

Cascades

Zone 605, 606, 607, 608, 609, 610, 616, 617, 622, and 623
Use standard guidance matrix. (See section 5 below.)  Ensure adequate distance from downwind SSRAs for smoke to dissipate.  From T18S through T22S in Zone 608 units should be 1000 tons or less, spaced 5 miles apart.

Zone 611 and 620
Units should be 1000 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.

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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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