SMI West (Smoke Management Instructions) (no subject)

Thu Dec 2 14:43:16 PST 2010

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS

SALEM FORESTRY WEATHER CENTER

OREGON DEPARTMENT OF FORESTRY

ISSUED: Thursday, December 2, 2010       2:30 PM      Jim Little

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

    FRIDAY

Upper air charts show a deep and compact low developing about 500 miles offshore on Friday.  This will pump up a weak ridge over the Pacific Northwest giving dry weather but a very stable atmosphere.  Atmospheric ventilation conditions will be generally marginal.  Transport winds will have an easterly component, however, allowing for some burn opportunities that don't occur with the prevailing west or southwesterly flow this time of year.

   EXTENDED OUTLOOK (SATURDAY - MONDAY)

The upper low moves to about 600 miles west of San Francisco Saturday and winds aloft back to a more southerly direction.  This brings some light rain northward from California and Nevada.  Amounts will be light and confined mainly to southwestern Oregon. Ventilation conditions remain poor, but again, an easterly component to transport winds may present some burn opportunities. On Sunday the upper low off the California coast weakens, upper flow continues southerly and ventilation conditions remain poor to marginal.  Expect little change for Monday.

2.  DISPERSION

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

MORNING

Mixing height near 1000 ft.

Transport wind ESE to S at 4 - 8 mph.

Surface wind light and variable and controlled by local terrain.

AFTERNOON

Mixing height 1000 - 2000 ft.

Transport wind shifts to NE to E at 8 - 12 mph.

Surface wind similar to morning.

EVENING

Mixing height 1000 - 1900 ft.

Transport wind increases to NE to ENE at 10 - 22 mph.

Surface wind increases to NNE to ENE at 4 - 8 mph.

Zone 605-611 (North Cascades):

MORNING

Mixing height below 1000 ft.

Transport wind light and variable.

Surface wind light and variable and controlled by local terrain.

AFTERNOON

Mixing height rising to 1700 - 2700 ft.

Transport wind increases to ENE to ESE at 5 - 9 mph.

Surface wind increases to ENE to ESE at 4 - 8 mph.

EVENING

Mixing height 1500 - 2500 ft.

Transport wind E to SE at 8 - 14 mph.

Surface wind E to SE at 6 - 10 mph.

Zone 615-620 (South Coast Range):

MORNING

Mixing height 1000 - 1800 ft.

Transport wind light and variable.

Surface wind light and variable and controlled by local terrain.

AFTERNOON

Mixing height 1000 - 1700 ft.

Transport wind NE to E at 6 - 10 mph.

Surface wind similar to morning.

EVENING

Mixing height 1500 - 2500 ft.

Transport wind ENE to ESE at 6 - 10 mph.

Surface wind similar to afternoon.

Zone 616-623 (South Cascades):

MORNING

Mixing height below 1000 ft.

Transport wind light and variable.

Surface wind light and variable and controlled by local terrain.

AFTERNOON

Mixing height 1000 - 2000 ft.

Transport wind similar to morning.

Surface wind similar to morning.

EVENING

Mixing height 1500 - 2500 ft.

Transport wind increases to E to SE at 5 - 9 mph.

Surface wind ENE to ESE at 4 - 8 mph.

OUTLOOK:

SATURDAY

Mixing height below 1000 ft early rising to 1000 to 1600 ft by late morning and through the afternoon.  Transport wind ENE to ESE at 6 - 10 mph.  Surface wind ENE to ESE at 4 - 8 mph during the morning becoming light and variable during the afternoon.

SUNDAY

Mixing height below 1000 ft during the morning rising to 1000 to 2000 ft during the afternoon.  Transport wind ESE to SSE at 5 - 9 mph.  Surface wind light and variable.

MONDAY

Mixing height below 1000 ft during the morning rising to 1600 to 2600 ft during the afternoon.  Transport wind SE to SSW at 6 - 10 mph.  Surface wind light and variable.

3.  BURNING INSTRUCTIONS FOR ALL ZONES IN THE WESTERN OREGON AREA

These instructions are valid for burning conducted on Friday, December 3, 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, 606, 620, and 622

No burning allowed.

Zone 607, 608, 616, 617, and 623

Units should be 500 tons or less, spaced 15 miles apart, and 15 miles from downwind SSRAs.

Zone 609, 610, and 611

Units should be 1000 tons or less, spaced 15 miles apart, and 15 miles from downwind SSRAs.

Siskiyous

Units should be 1000 tons or less, spaced 15 miles apart, and 15 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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