SMI West (Smoke Management Instructions) (no subject)

Tue Dec 7 13:55:37 PST 2010

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS

SALEM FORESTRY WEATHER CENTER

OREGON DEPARTMENT OF FORESTRY

ISSUED: Tuesday, December 7, 2010       2:30 PM      Jim Little

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

A low pressure area aloft will be centered about 400 miles west of the northern tip of Vancouver Island on Wednesday.  Upper level flow will be generally southwesterly across the region.  A cold front very early in the day will leave between a quarter and a half of an inch of rain on the ground, but as the front pushes east only scattered showers are likely in the cool unstable air mass behind the front.  The instability should give mostly fair smoke dispersal conditions to the area, and transport winds winds will be mostly south-southwesterly.

    EXTENDED OUTLOOK (THURSDAY - SATURDAY)
On Thursday upper flow veers to more westerly.  The air mass will slowly stabilize during the outlook period leading to deteriorating ventilation conditions.  Expect a few showers Thursday and still generally fair smoke dispersal conditions.  For Friday just scattered showers and marginal to fair ventilation.  Winds will start out westerly and become south to southwesterly during the day.  An approaching warm front Saturday will bring rain, but the warm air streaming in aloft with this system will accelerate the stabilization of the atmosphere and maximum mixing heights will be quite low and ventilation poor.

2.  DISPERSION

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

MORNING

Mixing height 3500 - 4500 ft.

Transport wind SSW to SW at 15 - 29 mph.

Surface wind S to SW at 10 - 16 mph.

AFTERNOON

Mixing height 3900 - 4900 ft.

Transport wind SSW to SW at 18 - 30 mph.

Surface wind SSW to SW at 10 - 18 mph.

EVENING

Mixing height 2900 - 3900 ft.

Transport wind similar to afternoon.

Surface wind similar to afternoon.

Zone 605-611 (North Cascades):

MORNING

Mixing height 3000 - 4000 ft.

Transport wind S to SW at 13 - 25 mph.

Surface wind S to SW at 12 - 24 mph.

AFTERNOON

Mixing height 3500 - 4500 ft.

Transport wind SSW to WSW at 10 - 18 mph.

Surface wind decreases to SSW to WSW at 9 - 15 mph.

EVENING

Mixing height 2600 - 3600 ft.

Transport wind SSW to SW at 10 - 20 mph.

Surface wind SSW to SW at 10 - 16 mph.

Zone 615-620 (South Coast Range):

MORNING

Mixing height 3000 - 4000 ft.

Transport wind SSW to SW at 12 - 24 mph.

Surface wind S to SW at 10 - 20 mph.

AFTERNOON

Mixing height 3800 - 4800 ft.

Transport wind SSW to SW at 12 - 22 mph.

Surface wind SSW to WSW at 10 - 16 mph.

EVENING

Mixing height 2800 - 3800 ft.

Transport wind similar to afternoon.

Surface wind SSW to SW at 8 - 12 mph.

Zone 616-623 (South Cascades):

MORNING

Mixing height 2300 - 3300 ft.

Transport wind SSE to SSW at 8 - 12 mph.

Surface wind SE to SSW at 6 - 12 mph.

AFTERNOON

Mixing height 2300 - 3300 ft.

Transport wind shifts to SSW to WSW at 8 - 14 mph.

Surface wind shifts to SSW to WSW at 6 - 12 mph.

EVENING

Mixing height 2900 - 3900 ft.

Transport wind similar to afternoon.

Surface wind similar to afternoon.

OUTLOOK:

THURSDAY

Mixing height 2600 to 3600 ft throughout the day.  Transport wind SSW to SW at 12 - 22 mph.  Surface wind SSW to SW at 9 - 15 mph.

FRIDAY

Mixing height below 1000 ft early rising to 1500 to 2500 ft by late morning rising to 2600 to 3600 ft during the afternoon.  Transport wind WSW to WNW at 8 - 12 mph during the morning becoming SW to W at 6 - 10 mph during the afternoon.  Surface wind SW to W at 4 - 8 mph.

SATURDAY

Mixing height below 1000 ft early rising to 1000 to 1700 ft by late morning and through the afternoon.  Transport wind S to SSW at 10 - 16 mph during the morning becoming SSW to SW at 12 - 24 mph during the afternoon.  Surface wind E to SSE at 4 - 8 mph during the morning becoming SE to SSW at 4 - 8 mph during the afternoon.

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

These instructions are valid for burning conducted on Wednesday, December 8, 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, and 619

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

Zone 620

Units should be 1500 tons or less, spaced 8 miles apart, and 10 miles from downwind SSRAs.  South of T35S units should be 500 tons or less, spaced 8 miles apart, and 10 miles from downwind SSRAs.

Cascades

All zones except zone 611

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

Zone 611

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

Siskiyous

Units should be 750 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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