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

[ODF Smoke Management Instructions]

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

ISSUED: Tuesday, July 6, 2010       7:30 AM      Jim Little

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

Upper air charts show a strong ridge aloft extending from about 600 miles west of northern California northward into the Yukon.  This gives a dry northerly to northwesterly flow aloft over the region.  At the surface a strong thermal trough extends from the central valley of California into southwest Oregon.  A strong, generally northerly or northeasterly pressure gradient has set up.  Morning soundings from Salem and Eugene show low level inversions.  However with quite warm surface temperatures today any inversion should easily be broken for mixing heights rising to well above 5000 feet in the afternoon.  Winds will be quite brisk today and wind precautions need to be observed.


2.  DISPERSION

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

MORNING
Mixing height 2000 - 3000 ft.
Transport wind NE to ENE at 10 - 22 mph.
Surface wind NE to ENE at 10 - 16 mph.

AFTERNOON
Mixing height rising above 5000 ft.
Transport wind NE to ENE at 14 - 28 mph.
Surface wind similar to morning.

EVENING
Mixing height remains above 5000 ft.
Transport wind NE to ENE at 18 - 30 mph.
Surface wind similar to afternoon.

Zone 605-611 (North Cascades):

MORNING
Mixing height 2000 - 3000 ft.
Transport wind ENE to ESE at 10 - 18 mph.
Surface wind ENE to E at 10 - 16 mph.

AFTERNOON
Mixing height rising above 5000 ft.
Transport wind NE to E at 9 - 15 mph.
Surface wind NE to ENE at 9 - 15 mph.

EVENING
Mixing height 3100 - 4100 ft.
Transport wind ENE to E at 9 - 15 mph.
Surface wind NE to E at 8 - 12 mph.

Zone 615-620 (South Coast Range):

MORNING
Mixing height 2100 - 3100 ft.
Transport wind NE to E at 8 - 14 mph.
Surface wind NE to ENE at 8 - 12 mph.

AFTERNOON
Mixing height rising above 5000 ft.
Transport wind N to NE at 10 - 20 mph.
Surface wind N to NE at 10 - 16 mph.

EVENING
Mixing height 3600 - 4600 ft.
Transport wind NNE to NE at 9 - 15 mph.
Surface wind N to NE at 6 - 10 mph.

Zone 616-623 (South Cascades):

MORNING
Mixing height 2500 - 3500 ft.
Transport wind E to ESE at 13 - 25 mph.
Surface wind E to ESE at 10 - 22 mph.

AFTERNOON
Mixing height rising above 5000 ft.
Transport wind decreases to ENE to ESE at 6 - 10 mph.
Surface wind decreases to ENE to ESE at 5 - 9 mph.

EVENING
Mixing height remains above 5000 ft.
Transport wind similar to afternoon.
Surface wind similar to afternoon.

3.  BURNING INSTRUCTIONS FOR ALL ZONES IN THE WESTERN OREGON AREA
These instructions are valid for burning conducted on Tuesday, July 6, 2010.
=================================================================

Coast Range

All Zones
Use standard guidance matrix. (See section 5 below.)  Ensure adequate distance from downwind SSRAs for smoke to dissipate.


Cascades

Zone 605 and 606
Units should be 500 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.  Higher tonnage is possible south of T20S in Zone 606.  Call the forecaster.

Zone 607, 608, 616, 617, 620, 622, and 623
Units should be 1000 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.

Zone 609 and 610
Units should be 1500 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.

Zone 611
Use standard guidance matrix. (See section 5 below.)


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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