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

Thu Jun 17 14:15:44 PDT 2010

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS

SALEM FORESTRY WEATHER CENTER

OREGON DEPARTMENT OF FORESTRY

ISSUED: Thursday, June 17, 2010       2:30 PM      Pete Parsons

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

    FRIDAY

A cool upper-level trough will remain over Washington and Oregon.  Another disturbance will rotate into the trough, from off the southern British Columbia coastline, and take up residence just off the northern Oregon coast.  That will maintain a cool and moist southwesterly flow aloft over Oregon with onshore flow in the transport layer, especially across the northern zones.

Morning marine low clouds should be prevalent west of the Cascade crest, especially across the northern and central zones, with partial afternoon clearing.  However, daytime heating will combine with cool air aloft and the approaching weather disturbance to destabilize the atmosphere and increase the chance of showers.  There is even a chance of late afternoon and evening thundershowers, mainly near the Cascades.  Temperatures will remain well below normal with moderately high afternoon mixing heights.

    OUTLOOK (SATURDAY-MONDAY)

An upper-level disturbance will move onshore and over western Oregon Saturday with showers or areas of rain likely and well below normal temperatures.  The disturbance will move over eastern Oregon Sunday with the shower threat decreasing.  Considerable marine low clouds, west of the Cascade crest, should partially clear Sunday afternoon, but high temperatures will be remain well below normal with strong onshore flow at the transport level.  The onshore flow will turn more northerly Monday, as a transitory upper-level ridge moves over Oregon.  That will promote more afternoon clearing with temperatures recovering to only slightly below normal.  Moderate to high afternoon mixing heights are expected during the outlook period.

2.  DISPERSION

Zone 601-612 (North Coast Range and Cascades):

MORNING

Mixing height below 1500 ft early rising to 2500 - 3500 ft by late morning.

Transport wind NW to NNE at 6 - 10 mph.

Surface wind NW to N at 4 - 8 mph.

AFTERNOON

Mixing height rising to 4000 - 5000 ft.

Transport wind NW to NNW at 9 - 15 mph.

Surface wind increases to WNW to NW at 10 - 18 mph.

EVENING

Mixing height 2000 - 3000 ft.

Transport wind similar to afternoon.

Surface wind WNW to NNW at 8 - 12 mph.

Zone 615-620 (South Coast Range):

MORNING

Mixing height below 1500 ft early rising to 2500 - 3500 ft by late morning.

Transport wind NNW to NNE at 9 - 15 mph.

Surface wind NNW to NNE at 8 - 12 mph.

AFTERNOON

Mixing height rising to 4000 - 5000 ft.

Transport wind NW to N at 10 - 18 mph.

Surface wind NW to NNW at 10 - 18 mph.

EVENING

Mixing height 2000 - 3000 ft.

Transport wind NNW to NNE at 10 - 20 mph.

Surface wind NW to N at 8 - 14 mph.

Zone 616-623 (South Cascades):

MORNING

Mixing height below 1500 ft early rising to 3000 - 4000 ft by late morning.

Transport wind NNW to NNE at 4 - 8 mph.

Surface wind NW to NNE at 4 - 8 mph.

AFTERNOON

Mixing height 4000 - 5000 ft.

Transport wind NW to N at 8 - 12 mph.

Surface wind NW to NNW at 8 - 12 mph.

EVENING

Mixing height 2000 - 3000 ft.

Transport wind similar to afternoon.

Surface wind similar to afternoon.

OUTLOOK:

SATURDAY

Mixing height 1700 to 2700 ft during the morning rising to 3900 to 4900 ft during the afternoon.  Transport wind W to NNW at 5 - 9 mph.  Surface wind light and variable during the morning becoming WNW to NNW at 8 - 12 mph during the afternoon.

SUNDAY

Mixing height below 1000 ft early rising to 2400 to 3400 ft by late morning rising to 3900 to 4900 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 8 - 12 mph during the afternoon.

MONDAY

Mixing height below 1000 ft early rising to 2400 to 3400 ft by late morning rising to 4200 to 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming NNW to N at 8 - 12 mph during the afternoon.  Surface wind light and variable during the morning becoming NW to N at 8 - 12 mph during the afternoon.

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

These instructions are valid for burning conducted on Friday, June 18, 2010.

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

Coast Range

Zone 601, 612, and 616 east of R9W

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.  Higher tonnage is possible south of Waldport in Zone 612.  Call the forecaster.  Restrict units to 500 tons or less south of T30S in Zone 616.

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 T17S in Zone 603.  Call the forecaster.

Zone 615

Units should be 2000 tons or less, spaced 8 miles apart, and 10 miles from downwind SSRAs.

Zone 616 west of R8W

Units should be 1200 tons or less, spaced 8 miles apart, and 10 miles from downwind SSRAs.

Zone 618 and 619

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

Zone 620

Units should be 500 tons or less, spaced 8 miles apart, and 10 miles from downwind SSRAs.  Higher tonnage is possible south of the Rogue River.  Call the forecaster.

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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