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

Mon Sep 20 07:24:15 PDT 2010

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

ISSUED: Monday, September 20, 2010       7:30 AM      Jim Little

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

A few scattered showers remain over northern sections this morning as a result of an upper level trough lingering over the Pacific Northwest.  Meanwhile a weak upper level low over British Columbia will sag southward today keeping showers going in the north through the day.  Expect mostly dry weather in southern zones.

2.  DISPERSION

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

MORNING
Mixing height 1700 - 2700 ft.
Transport wind SW to W at 10 - 20 mph.
Surface wind SSW to W at 6 - 12 mph.

AFTERNOON
Mixing height lowers to 1200 - 2200 ft.
Transport wind WSW to WNW at 9 - 15 mph.
Surface wind WSW to NW at 6 - 12 mph.

EVENING
Mixing height lowers below 1000 ft.
Transport wind W to NW at 8 - 12 mph.
Surface wind becomes light and variable and controlled by local terrain.

Zone 605-611 (North Cascades):

MORNING
Mixing height 1800 - 2800 ft.
Transport wind SSW to SW at 9 - 15 mph.
Surface wind SSW to SW at 9 - 15 mph.

AFTERNOON
Mixing height rising to 4100 - 5000 ft.
Transport wind shifts to W to NW at 8 - 14 mph.
Surface wind shifts to W to NW at 9 - 15 mph.

EVENING
Mixing height lowers below 1000 ft.
Transport wind WNW to NNW at 4 - 8 mph.
Surface wind becomes light and variable and controlled by local terrain.

Zone 615-620 (South Coast Range):

MORNING
Mixing height 2400 - 3400 ft.
Transport wind light and variable.
Surface wind light and variable and controlled by local terrain.

AFTERNOON
Mixing height 2200 - 3200 ft.
Transport wind increases to WNW to NNW at 8 - 14 mph.
Surface wind increases to WNW to NNW at 8 - 14 mph.

EVENING
Mixing height lowers below 1000 ft.
Transport wind becomes light and variable.
Surface wind becomes light and variable and controlled by local terrain.

Zone 616-623 (South Cascades):

MORNING
Mixing height 2000 - 3000 ft.
Transport wind light and variable.
Surface wind light and variable and controlled by local terrain.

AFTERNOON
Mixing height rising to 4400 - 5000 ft.
Transport wind increases to WSW to NW at 6 - 10 mph.
Surface wind increases to WSW to NW at 6 - 10 mph.

EVENING
Mixing height 1000 - 1500 ft.
Transport wind WNW to NNW at 6 - 10 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 Monday, September 20, 2010.
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Coast Range

Zone 601, 612, and 616 east of R9W
Units should be 750 tons or less, spaced 15 miles apart, and 15 miles from downwind SSRAs.

Zone 602 and 603
No burning allowed.  Higher tonnage is possible south of the Siuslaw River in Zone 603.  Call the forecaster.

Zone 615 and 616 west of R8W
Units should be 1000 tons or less, spaced 15 miles apart, and 15 miles from downwind SSRAs.

Zone 618 and 619
Units should be 1500 tons or less, spaced 15 miles apart, and 15 miles from downwind SSRAs.

Zone 620
Units should be 500 tons or less, spaced 15 miles apart, and 15 miles from downwind SSRAs.  Higher tonnage is possible south of T35S.  Call the forecaster.

Cascades

Zone 605, 606, 607, 608, 609, 611, 616, 617, 622, and 623
Use standard guidance matrix. (See section 5 below.)  Ensure adequate distance from downwind SSRAs for smoke to dissipate.

Zone 610 and 620
Units should be 1000 tons or less, spaced 8 miles apart, and 10 miles from downwind SSRAs.

Siskiyous
Units should be 1500 tons or less, spaced 8 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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