SMI West (Smoke Management Instructions) (no subject)

Wed Apr 27 14:08:23 PDT 2011

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS

SALEM FORESTRY WEATHER CENTER

OREGON DEPARTMENT OF FORESTRY

ISSUED: Wednesday, April 27, 2011       2:30 PM      Jim Little

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

    THURSDAY
An upper level trough on a northeast to southwest axis moves across the region on Thursday.  Models show another band of moisture extending north-northeast to south-southwest moving across the region.  It will bring rain (or snow to higher elevations) by late morning to northern sections and the precipitation will spread southward into southern zones by afternoon.  Snow levels will be around 2000 feet in the north and 3000 feet in the south.  Smoke dispersal conditions will be fair or fair to good most areas and transport winds will be generally southwest.
    EXTENDED OUTLOOK (FRIDAY - SUNDAY)
The upper trough moves east early and a ridge of high pressure is building to the west of Oregon on Friday, although the axis of that ridge will be several hundred miles to the west of the coastline.  Western Oregon can expect drying but showers are still possible during the day.  The freezing level will begin to rise in the north.  Mixing heights should allow for fair to good smoke dispersal conditions most areas and transport winds will vary from northwest to southwest.
Saturday the ridge builds and its axis moves to about 300 miles west of the coast.  Weather turns dry but transport winds go light, generally northwest in the north with northerly transports in the south. Look for fair to good smoke dispersal conditions except just marginal conditions over the southern Cascades.
A broad ridge in the upper atmosphere moves over the region on Sunday for fair weather.  A thermal trough builds over California and low level flow goes light offshore.  Smoke dispersal conditions should generally be fair.

2.  DISPERSION

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

MORNING

Mixing height 1100 - 2100 ft.

Transport wind SW to W at 8 - 12 mph.

Surface wind SW to W at 5 - 9 mph.

AFTERNOON

Mixing height rising to 4000 - 5000 ft.

Transport wind WSW to NW at 6 - 10 mph.

Surface wind W to NW at 8 - 14 mph.

EVENING

Mixing height 2100 - 3100 ft.

Transport wind similar to afternoon.

Surface wind WSW to WNW at 6 - 12 mph.

Zone 605-611 (North Cascades):

MORNING

Mixing height 1100 - 2100 ft.

Transport wind SSW to SW at 8 - 12 mph.

Surface wind SSW to WSW at 6 - 12 mph.

AFTERNOON

Mixing height rising to 3000 - 4000 ft.

Transport wind SW to W at 5 - 9 mph.

Surface wind SW to W at 6 - 10 mph.

EVENING

Mixing height 2500 - 3500 ft.

Transport wind SSW to WSW at 6 - 12 mph.

Surface wind SSW to WSW at 6 - 10 mph.

Zone 615-620 (South Coast Range):

MORNING

Mixing height 3100 - 4100 ft.

Transport wind WSW to WNW at 10 - 18 mph.

Surface wind WSW to WNW at 10 - 16 mph.

AFTERNOON

Mixing height rising above 5000 ft.

Transport wind decreases to WSW to NW at 6 - 10 mph.

Surface wind WSW to NW at 6 - 10 mph.

EVENING

Mixing height 2800 - 3800 ft.

Transport wind W to NW at 6 - 10 mph.

Surface wind similar to afternoon.

Zone 616-623 (South Cascades):

MORNING

Mixing height 1900 - 2900 ft.

Transport wind SSW to W at 6 - 12 mph.

Surface wind SSW to W at 6 - 12 mph.

AFTERNOON

Mixing height rising to 3500 - 4500 ft.

Transport wind shifts to W to NW at 8 - 12 mph.

Surface wind shifts to W to NW at 8 - 12 mph.

EVENING

Mixing height 2100 - 3100 ft.

Transport wind WNW to NNW at 6 - 10 mph.

Surface wind WNW to NNW at 5 - 9 mph.

OUTLOOK:

FRIDAY

Mixing height 1900 to 2900 ft during the morning rising to 3200 to 4200 ft during the afternoon.  Transport wind WSW to WNW at 8 - 14 mph during the morning becoming WNW to NNW at 10 - 16 mph during the afternoon.  Surface wind SW to WNW at 6 - 12 mph during the morning becoming WNW to NNW at 8 - 14 mph during the afternoon.

SATURDAY

Mixing height below 1000 ft early rising to 2500 to 3500 ft by late morning rising to 3300 to 4300 ft during the afternoon.  Transport wind NNW to NNE at 4 - 8 mph.  Surface wind light and variable.

SUNDAY

Mixing height below 1000 ft early rising to 2500 to 3500 ft by late morning and through the afternoon.  Transport wind E to SSE at 4 - 8 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 Thursday, April 28, 2011.

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

Coast Range

Zone 601 and 612

Units should be 750 tons or less, spaced 8 miles apart, and 10 miles from downwind SSRAs.  Restrict units in or near corridors to 500 tons or less.

Zone 602 and 603

Units should be 300 tons or less, spaced 8 miles apart, and 10 miles from downwind SSRAs.  Avoid burning in or near corridors.  Higher tonnage is possible south of the Siuslaw River in Zone 603.  Call the forecaster.

Zone 615

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

Zone 616 west of R8W

Units should be 1200 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.

Zone 616 east of R9W

Units should be 750 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.  Restrict units to 500 tons or less south of T30S.

Zone 618

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

Zone 619

Units should be 2000 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.

Zone 620

Units should be 500 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.

Cascades

Zone 605, 606, 607, 608, 609, 610, 616, 617, and 623

Use standard guidance matrix. (See section 5 below.)  Ensure adequate distance from downwind SSRAs for smoke to dissipate.  From T18S through T22S in Zone 608 units should be 750 tons or less, spaced 10 miles apart.

Zone 611

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

Zone 620

Units should be 500 tons or less, spaced 8 miles apart, and 10 miles from downwind SSRAs.

Zone 622

Units should be 1000 tons or less, spaced 8 miles apart, and 10 miles from downwind SSRAs.  East of R2W, use standard guidance matrix. (See section 5 below.)

Siskiyous

Units should be 1500 tons or less, spaced 8 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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