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

Fri Sep 24 14:40:09 PDT 2010

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS

SALEM FORESTRY WEATHER CENTER

OREGON DEPARTMENT OF FORESTRY

ISSUED: Friday, September 24, 2010       2:30 PM      Pete Parsons

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

    SATURDAY

Southwesterly flow aloft will begin to increase Saturday, as a broad upper-level ridge shifts east of Oregon.  Mostly sunny skies will give way to increasing high clouds late, especially over western zones.  Increasing transport wind speeds will improve ventilation conditions.

    OUTLOOK (SUNDAY-TUESDAY)

A weak weather system is forecast to bring light rain onshore Sunday morning, mainly north.  Some rain could spread as far south and east as the central Cascades by Sunday afternoon.  Southwestern zones will see some increase in clouds but should stay dry, except for near the coastline.  The upper-level ridge is forecast to rebuild over the region Monday, which will create strong morning inversions with patchy valley fog.  Afternoon sunshine will provide good mixing, but transport winds will be light.  Increasing southwesterly flow aloft is forecast to bring another weak system into western Washington and northwestern Oregon Tuesday.  Increasing transport winds should improve ventilation conditions with only minimal precipitation, mainly north.

2.  DISPERSION

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

MORNING

Mixing height below 500 ft early rising to 1500 - 2500 ft by late morning.

Transport wind SSE to SW at 6 - 10 mph.

Surface wind light and variable but favors S and controlled by local terrain.

AFTERNOON

Mixing height rising to 2700 - 3700 ft.

Transport wind SSW to SW at 9 - 15 mph.

Surface wind increases to S to SW at 4 - 8 mph.

EVENING

Mixing height 1000 - 1800 ft.

Transport wind SSW to WSW at 6 - 10 mph.

Surface wind similar to afternoon.

Zone 605-611 (North Cascades):

MORNING

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

Transport wind SSE to SSW at 4 - 8 mph.

Surface wind light and variable but favors S to SW and controlled by local terrain.

AFTERNOON

Mixing height 3000 - 4000 ft.

Transport wind SSW to SW at 8 - 12 mph.

Surface wind similar to morning.

EVENING

Mixing height 1000 - 2000 ft.

Transport wind SW to W at 4 - 8 mph.

Surface wind similar to afternoon.

Zone 615-620 (South Coast Range):

MORNING

Mixing height below 500 ft early rising to 1500 - 2500 ft by late morning.

Transport wind SSE to SW at 4 - 8 mph.

Surface wind light and variable but favors S to SW and controlled by local terrain.

AFTERNOON

Mixing height rising to 2700 - 3700 ft.

Transport wind S to SW at 6 - 10 mph.

Surface wind similar to morning.

EVENING

Mixing height lowers below 1000 ft.

Transport wind becomes light and variable but favors S to SW and controlled by local terrain.

Surface wind similar to afternoon.

Zone 616-623 (South Cascades):

MORNING

Mixing height below 500 ft early rising to 2200 - 3200 ft by late morning.

Transport wind light and variable but favors S to SW and controlled by local terrain.

Surface wind light and variable but favors S to SW and controlled by local terrain.

AFTERNOON

Mixing height rising to 3500 - 4500 ft.

Transport wind increases to SW to W at 4 - 8 mph.

Surface wind similar to morning.

EVENING

Mixing height 1000 - 1500 ft.

Transport wind becomes light and variable but favors  and controlled by local terrain.

Surface wind similar to afternoon.

OUTLOOK:

SUNDAY

Mixing height below 1000 ft early rising to 2000 to 3000 ft by late morning rising to 2900 to 3900 ft during the afternoon.  Transport wind S to SSW at 8 - 12 mph during the morning becoming SW to W at 6 - 10 mph during the afternoon.  Surface wind SSE to SSW at 4 - 8 mph during the morning becoming SW to W at 4 - 8 mph during the afternoon.

MONDAY

Mixing height below 1000 ft early rising to 1600 to 2600 ft by late morning rising to 3000 to 4000 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.

TUESDAY

Mixing height below 1000 ft early rising to 1800 to 2800 ft by late morning rising to 3600 to 4600 ft during the afternoon.  Transport wind light and variable during the morning becoming WSW to NW at 6 - 10 mph during the afternoon.  Surface wind light and variable during the morning becoming W to NW 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 Saturday and Sunday, September 25 and 26, 2010.

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

For Saturday:

Coast Range

Zone 601 and 612

Units should be 1000 tons or less, spaced 10 miles apart, and 12 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 10 miles apart, and 12 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 10 miles apart, south of the Siuslaw River in Zone 603.

Zone 615 and 616 west of R8W

Units should be 1500 tons or less, spaced 10 miles apart, and 12 miles from downwind SSRAs.  Higher tonnage is possible south of T29S in Zone 616.  Call the forecaster.

Zone 616 east of R9W

Units should be 750 tons or less, spaced 10 miles apart, and 12 miles from downwind SSRAs.  Higher tonnage is possible south of T29S.  Call the forecaster.

Zone 618, 619, and 620

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

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

Siskiyous

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

For Sunday:

Coast Range

Zone 601 and 612

Units should be 1000 tons or less, spaced 15 miles apart, and 15 miles from downwind SSRAs.  North of Tillamook in Zone 601, use standard guidance matrix. (See section 5 below.)

Zone 602 and 603

No burning allowed.  North of T3N in Zone 602, use standard guidance matrix. (See section 5 below.)  Units may be 750 tons or less, spaced 15 miles apart, south of the Siuslaw River in Zone 603.

Zone 615, 616 west of R8W, 619, and 620

Units should be 1500 tons or less, spaced 15 miles apart, and 15 miles from downwind SSRAs.  Higher tonnage is possible south of T29S in Zone 616.  Call the forecaster.  South of T35S in Zone 620 units should be 500 tons or less, spaced 15 miles apart, and 15 miles from downwind SSRAs.

Zone 616 east of R9W

Units should be 750 tons or less, spaced 15 miles apart, and 15 miles from downwind SSRAs.  Higher tonnage is possible south of T29S.  Call the forecaster.

Zone 618

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

Cascades

Zone 605, 606, 607, 608, 609, 610, 617, 620, 622, 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.

Zone 611

Units should be 750 tons or less, spaced 15 miles apart, and 15 miles from downwind SSRAs.

Zone 616

Units should be 500 tons or less, spaced 15 miles apart, and 15 miles from downwind SSRAs.  Avoid ignitions north of T24S.  South of T29S higher tonnage is possible.  Call the forecaster.

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.

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://omls.oregon.gov/pipermail/smi_west/attachments/20100924/5315e352/attachment.html>