SMI West (Smoke Management Instructions) (no subject)

Mon Dec 6 14:20:03 PST 2010

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS

SALEM FORESTRY WEATHER CENTER

OREGON DEPARTMENT OF FORESTRY

ISSUED: Monday, December 6, 2010       2:30 PM      Jim Little

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

    TUESDAY

Upper air charts show a deep low pressure circulation centered about 750 miles west of Oregon on Tuesday.  An upper ridge lies along a line from Nevada through northern Idaho.  A Pacific frontal system will rotate around the offshore low.  Light rain from a weak warm front will move south to north early in the day but precipitation amounts will be light.  A trailing cold front will push into coastal areas late Tuesday then inland overnight for more significant precipitation.  Transport winds will be a brisk south to south-southeast and ventilation conditions should be generally fair.

    EXTENDED OUTLOOK (WEDNESDAY - FRIDAY)

The upper low rotates into the northern Gulf of Alaska on Wednesday and flow over the region veers to more southwesterly. Mixing heights generally improve slightly for fair to good smoke dispersal conditions most areas. On Thursday warmer air aloft stabilizes the atmosphere and ventilation conditions deteriorate to marginal to fair.  Expect little change for Friday although mixing heights may be slightly better than on Thursday.

2.  DISPERSION

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

MORNING

Mixing height 3500 - 4500 ft.

Transport wind SE to S at 12 - 22 mph.

Surface wind light and variable and controlled by local terrain.

AFTERNOON

Mixing height 3500 - 4500 ft.

Transport wind S at 18 - 32 mph.

Surface wind increases to SSE to SSW at 8 - 14 mph.

EVENING

Mixing height 3500 - 4500 ft.

Transport wind SSE to S at 16 - 30 mph.

Surface wind ESE to SSE at 8 - 12 mph.

Zone 605-611 (North Cascades):

MORNING

Mixing height 2500 - 3500 ft.

Transport wind ESE to SSE at 9 - 15 mph.

Surface wind E to SSE at 6 - 12 mph.

AFTERNOON

Mixing height 2800 - 3800 ft.

Transport wind shifts to SSW to WSW at 6 - 10 mph.

Surface wind shifts to SSW to WSW at 4 - 8 mph.

EVENING

Mixing height 2500 - 3500 ft.

Transport wind shifts to SE to S at 10 - 16 mph.

Surface wind shifts to ESE to SSE at 8 - 14 mph.

Zone 615-620 (South Coast Range):

MORNING

Mixing height 4000 - 5000 ft.

Transport wind SE to S at 10 - 20 mph.

Surface wind SE to S at 8 - 14 mph.

AFTERNOON

Mixing height 4000 - 5000 ft.

Transport wind SSW at 20 - 36 mph.

Surface wind increases to S to SSW at 14 - 28 mph.

EVENING

Mixing height 4000 - 5000 ft.

Transport wind S at 18 - 32 mph.

Surface wind S to SSW at 12 - 24 mph.

Zone 616-623 (South Cascades):

MORNING

Mixing height 2500 - 3500 ft.

Transport wind ESE to SE at 10 - 22 mph.

Surface wind ESE to SE at 9 - 15 mph.

AFTERNOON

Mixing height 2800 - 3800 ft.

Transport wind SE to SSW at 10 - 18 mph.

Surface wind SE to S at 8 - 12 mph.

EVENING

Mixing height 2500 - 3500 ft.

Transport wind SSE to S at 12 - 24 mph.

Surface wind SE to S at 10 - 18 mph.

OUTLOOK:

WEDNESDAY

Mixing height 3500 to 4500 ft throughout the day.  Transport wind S to SSW at 15 - 25 mph during the morning becoming SSW to SW at 10 - 20 mph during the afternoon.  Surface wind S to SW at 10 - 20 mph.

THURSDAY

Mixing height 3500 to 4500 ft during the morning lowering to 2100 to 3100 ft during the afternoon.  Transport wind SSW to SW at 10 - 18 mph.  Surface wind SE to S at 4 - 8 mph.

FRIDAY

Mixing height 1200 to 2200 ft during the morning rising to 2400 to 3400 ft during the afternoon.  Transport wind SW to W at 8 - 12 mph.  Surface wind SSW to WSW at 4 - 8 mph.

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

These instructions are valid for burning conducted on Tuesday, December 7, 2010.

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

Coast Range

Zone 601 and 612

Units should be 1000 tons or less, spaced 8 miles apart, and 10 miles from downwind SSRAs.  North of Tillamook in Zone 601, use standard guidance matrix. (See section 5 below.)

Zone 602 and 603

Units should be 500 tons or less, spaced 8 miles apart, and 10 miles from downwind SSRAs.  North of T3N in Zone 602, use standard guidance matrix. (See section 5 below.)  Units may be 750 tons or less, spaced 8 miles apart, south of the Siuslaw River in Zone 603.

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, 606, 607, 608, 609, 610, and 623

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

Zone 611 and 616

Units should be 750 tons or less, spaced 10 miles apart, and 12 miles from downwind SSRAs.  In zone 616 avoid ignitions north of T24S.  South of T29S higher tonnage is possible.  Call the forecaster.

Zone 617, 620, and 622

Units should be 1000 tons or less, spaced 10 miles apart, and 12 miles from downwind SSRAs.

Siskiyous

Units should be 750 tons or less, spaced 10 miles apart, and 12 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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