SMI West (Smoke Management Instructions) Western Oregon Smoke Management Instructions

Fri Jun 25 14:26:21 PDT 2010

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS

SALEM FORESTRY WEATHER CENTER

OREGON DEPARTMENT OF FORESTRY

ISSUED: Friday, June 25, 2010       2:30 PM      Pete Parsons

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

    SATURDAY

A flat upper-level ridge will move over Oregon and may produce areas of offshore flow in the morning, mainly south.  That could allow for late-morning burning, in southern coast range zones, before the sea-breeze turns the flow back onshore in the afternoon.  Morning clouds will break up more quickly than on Friday with temperatures recovering to near normal north and slightly above normal south.  Daytime smoke dispersal conditions should be fair in the western zones and fair to good in the eastern zones.

     OUTLOOK (SUNDAY-TUESDAY)

The flat upper-level ridge is forecast to get forced east of the state Sunday by a strengthening southwesterly flow aloft.  A weak surface thermal trough will also shift east of the Cascades by late in the day, which will increase the onshore flow across western Oregon.  The marine layer is forecast to deepen Monday and Tuesday with more extensive morning clouds and possible areas of drizzle. No significant precipitation is expected during the outlook period, but there is a slight chance of showers on Tuesday, mainly over higher terrain.  Temperatures will likely cool from just above normal Sunday to below normal by Tuesday. Mixing heights will be suppressed by the cool marine layer, especially in the mornings, but afternoon smoke dispersion should be fair to good during the outlook period.

2.  DISPERSION

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

MORNING

Mixing height below 500 ft early rising to 1800 - 2800 ft by late morning.

Transport wind light and variable but favors W to N and controlled by local terrain.

Surface wind light and variable but favors W to N and controlled by local terrain.

AFTERNOON

Mixing height rising to 3000 - 4000 ft.

Transport wind increases to NW to N at 6 - 12 mph.

Surface wind increases to NW to N at 6 - 10 mph.

EVENING

Mixing height 1000 - 1700 ft.

Transport wind similar to afternoon.

Surface wind WNW to NNW at 4 - 8 mph.

Zone 605-611 (North Cascades):

MORNING

Mixing height below 500 ft early rising to 2000 - 3000 ft by late morning.

Transport wind light and variable but favors W to N and controlled by local terrain.

Surface wind light and variable but favors W to N and controlled by local terrain.

AFTERNOON

Mixing height rising to 4000 - 5000 ft.

Transport wind increases to NW to NNE at 6 - 10 mph.

Surface wind increases to NW to NNE at 6 - 10 mph.

EVENING

Mixing height 1300 - 2300 ft.

Transport wind NNW to NNE at 4 - 8 mph.

Surface wind NNW to NNE at 4 - 8 mph.

Zone 615-620 (South Coast Range):

MORNING

Mixing height below 500 ft early rising to 1800 - 2800 ft by late morning.

Transport wind N to NE at 5 - 9 mph.

Surface wind light and variable but favors NW to NE and controlled by local terrain.

AFTERNOON

Mixing height rising to 3000 - 4000 ft.

Transport wind increases to NW to N at 8 - 14 mph.

Surface wind increases to NNW to NNE at 8 - 14 mph.

EVENING

Mixing height 1000 - 2000 ft.

Transport wind NW to NNE at 5 - 9 mph.

Surface wind NW to N at 5 - 9 mph.

Zone 616-623 (South Cascades):

MORNING

Mixing height below 500 ft early rising to 3000 - 4000 ft by late morning.

Transport wind light and variable but favors NW to NE and controlled by local terrain.

Surface wind light and variable but favors NW to NE and controlled by local terrain.

AFTERNOON

Mixing height 4000 - 5000 ft.

Transport wind increases to NW to N at 6 - 12 mph.

Surface wind increases to NW to N at 6 - 12 mph.

EVENING

Mixing height 1500 - 2500 ft.

Transport wind NNW to NNE at 6 - 10 mph.

Surface wind NNW to NNE at 6 - 10 mph.

OUTLOOK:

SUNDAY

Mixing height below 1000 ft early rising to 2500 to 3500 ft by late morning rising to 3500 to 4500 ft during the afternoon.  Transport wind light and variable during the morning becoming WNW to NNW at 6 - 12 mph during the afternoon.  Surface wind light and variable during the morning becoming WNW to NNW at 6 - 10 mph during the afternoon.

MONDAY

Mixing height below 1000 ft early rising to 2500 to 3500 ft by late morning rising to 3800 to 4800 ft during the afternoon.  Transport wind NW to N at 4 - 8 mph.  Surface wind light and variable during the morning becoming WNW to NNW at 6 - 12 mph during the afternoon.

TUESDAY

Mixing height below 1000 ft early rising to 2800 to 3800 ft by late morning rising to 4000 to 5000 ft during the afternoon.  Transport wind NW to N at 5 - 9 mph.  Surface wind light and variable during the morning becoming NW to N at 6 - 10 mph during the afternoon.

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

These instructions are valid for burning conducted on Saturday, June 26, 2010.

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

Coast Range

***Complete ignitions by noon in Zone 615 and 616.***

Zone 601, 612, and 616 east of R9W

Units should be 750 tons or less, spaced 10 miles apart, and 12 miles from downwind SSRAs.  Restrict units in or near corridors to 500 tons or less.  Restrict units to 500 tons or less south of T30S in Zone 616.

Zone 602, 603, and 620

No burning allowed.  Avoid burning in or near corridors.  Some burning allowed south of the Rogue River in Zone 620.  Call the forecaster.

Zone 615

Units should be 2000 tons or less, spaced 10 miles apart, and 12 miles from downwind SSRAs.

Zone 616 west of R8W

Units should be 1500 tons or less, spaced 10 miles apart, and 12 miles from downwind SSRAs.

Zone 618 and 619

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

Cascades

Zone 605, 606, 607, 608, 609, 611, 616, 617, and 623

Use standard guidance matrix. (See section 5 below.)  Ensure adequate distance from downwind SSRAs for smoke to dissipate.  Verify transport winds away from SSRA if burning within 10 miles of the SSRA in Zone 605 and 606.  South of T30S in Zone 616 units should be 500 tons or less, spaced 8 miles apart.  South of T30S in Zone 617 units should be 750 tons or less, spaced 8 miles apart.

Zone 610

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

Zone 620 and 622

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

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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