SMI West (Smoke Management Instructions) (no subject)

Mon Oct 11 14:13:29 PDT 2010

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS

SALEM FORESTRY WEATHER CENTER

OREGON DEPARTMENT OF FORESTRY

ISSUED: Monday, October 11, 2010       2:30 PM      Jim Little

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

    TUESDAY
A broad ridge in the upper atmosphere covers the region on Tuesday.  This ridge extends from a high centered just off the northern California coast.  A surface thermal trough extends northward from California.  Initially this will be offshore but should shift inland during the afternoon hours.  The pattern suggests a very light east to northeast transport wind.  Warm air and subsidence aloft will put a lid on mixing heights and smoke dispersal conditions will be poor to marginal many areas.
    EXTENDED OUTLOOK (WEDNESDAY - FRIDAY)
The upper ridge drifts east and by Wednesday its axis will lie on a line from Nevada to Alberta.  Low level flow will remain offshore but very light.  Smoke dispersal conditions will range from poor in the northwest to fair in the southern Cascades.  By Thursday the upper ridge moves east and an upper trough in the Gulf of Alaska turns flow aloft to southwesterly.  A weak front approaches the northwest coast late and may provide some light rain in northwestern Oregon and the north Cascades Thursday night.  Mixing heights should improve most areas.  Friday the remains of the front are through, transport winds turn northerly and transport winds turn northerly.

2.  DISPERSION

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

MORNING

Mixing height 1000 - 2000 ft.

Transport wind light and variable.

Surface wind light and variable and controlled by local terrain.

AFTERNOON

Mixing height 1400 - 2400 ft.

Transport wind increases to NE to ENE at 5-8 mph.

Surface wind similar to morning.

EVENING

Mixing height 1000 - 1700 ft.

Transport wind increases to NE to ENE at 6 - 12 mph.

Surface wind similar to afternoon.

Zone 605-611 (North Cascades):

MORNING

Mixing height 1200 - 2200 ft.

Transport wind light and variable.

Surface wind light and variable and controlled by local terrain.

AFTERNOON

Mixing height 1700 - 2700 ft.

Transport wind similar to morning.

Surface wind increases to N to NE at 5 - 9 mph.

EVENING

Mixing height 1000 - 1500 ft.

Transport wind increases to N to E at 4 - 8 mph.

Surface wind becomes light and variable and controlled by local terrain.

Zone 615-620 (South Coast Range):

MORNING

Mixing height 1000 - 2000 ft.

Transport wind light and variable.

Surface wind NE to E at 4 - 8 mph.

AFTERNOON

Mixing height 1300 - 2300 ft.

Transport wind NNE to ENE at 4 - 8 mph.

Surface wind NNE to ENE at 4 - 8 mph.

EVENING

Mixing height lowers below 1000 ft.

Transport wind NE to E at 8 - 12 mph.

Surface wind becomes light and variable and controlled by local terrain.

Zone 616-623 (South Cascades):

MORNING

Mixing height 1300 - 2300 ft.

Transport wind light and variable.

Surface wind light and variable and controlled by local terrain.

AFTERNOON

Mixing height rising to 2700 - 3700 ft.

Transport wind similar to morning.

Surface wind similar to morning.

EVENING

Mixing height lowers below 1000 ft.

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

Surface wind similar to afternoon.

OUTLOOK:

WEDNESDAY

Mixing height below 1000 ft early rising to 1000 to 1800 ft by late morning rising to 1900 to 2900 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.

THURSDAY

Mixing height below 1000 ft during the morning rising to 2900 to 3900 ft during the afternoon.  Transport wind S to SW at 5 - 9 mph during the morning becoming light and variable during the afternoon.  Surface wind light and variable.

FRIDAY

Mixing height below 1000 ft early rising to 1100 to 2100 ft by late morning rising to 3200 to 4200 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable during the morning becoming NW to N at 9 - 15 mph during the afternoon.

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

These instructions are valid for burning conducted on Tuesday, October 12, 2010.

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Coast Range

Zone 601 and 612

Units should be 750 tons or less, spaced 15 miles apart, and 15 miles from downwind SSRAs.

Zone 602 and 603

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

Zone 615, 616, 618, 619, and 620

Use standard guidance matrix. (See section 5 below.)  Avoid burning directly upwind of the North Bend/Coos Bay SSRA.

Cascades

Zone 605 and 606

No burning allowed.

Zone 607, 608, 610, and 611

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

Zone 609, 617, and 623

Use standard guidance matrix. (See section 5 below.)  Ensure adequate distance from downwind SSRAs for smoke to dissipate.  South of T30S in Zone 617 units should be 500 tons or less, spaced 10 miles apart.

Zone 616

Units should be 750 tons or less, spaced 10 miles apart, and 12 miles from downwind SSRAs.

Zone 620 and 622

No burning allowed.

Siskiyous

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

==============================================================

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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