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

Wed Oct 20 14:25:29 PDT 2010

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS

SALEM FORESTRY WEATHER CENTER

OREGON DEPARTMENT OF FORESTRY

ISSUED: Wednesday, October 20, 2010       2:30 PM      Pete Parsons

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

THURSDAY

The strong upper-level ridge that has been over the region for the past few days will shift eastward to over the northern Rockies.  The first in a series of weather systems is forecast to bring a chance of light rain to the coastline in the afternoon and over much of western Oregon in the evening.  Increasing south to southwesterly transport winds and higher mixing heights will combine to improve smoke dispersal conditions to fair.

OUTLOOK (FRIDAY-SUNDAY)

West-southwesterly flow aloft will maintain considerable clouds across the region, but rainfall will likely be spotty and light.  Further cooling aloft will continue to lift mixing heights with fair to good afternoon smoke dispersal conditions.  Another weather system is forecast to spread mostly light rain across western Oregon Friday night and Saturday.  Daytime smoke dispersion will remain fair to good.  A strong and moisture-laden cold front is forecast to bring more significant rain to all of western Oregon Sunday, along with brisk southwesterly to westerly transport winds.

2.  DISPERSION

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

MORNING

Mixing height below 1000 ft early rising to 1700 - 2700 ft by late morning.

Transport wind S to SW at 4 - 8 mph.

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

AFTERNOON

Mixing height 2300 - 3300 ft.

Transport wind increases to SSW to WSW at 9 - 15 mph.

Surface wind increases to SSW to WSW at 4 - 8 mph.

EVENING

Mixing height 1500 - 2500 ft.

Transport wind similar to afternoon.

Surface wind S to SW at 4 - 8 mph.

Zone 605-611 (North Cascades):

MORNING

Mixing height below 1000 ft early rising to 1900 - 2900 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 W and controlled by local terrain.

AFTERNOON

Mixing height 2300 - 3300 ft.

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

Surface wind similar to morning.

EVENING

Mixing height 1000 - 2000 ft.

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

Surface wind similar to afternoon.

Zone 615-620 (South Coast Range):

MORNING

Mixing height below 1000 ft early rising to 2000 - 3000 ft by late morning.

Transport wind S to SW at 6 - 10 mph.

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

AFTERNOON

Mixing height rising to 3300 - 4300 ft.

Transport wind increases to SSW to SW at 10 - 20 mph.

Surface wind increases to SSW to WSW at 4 - 8 mph.

EVENING

Mixing height 2000 - 3000 ft.

Transport wind similar to afternoon.

Surface wind SSE to SW at 5 - 9 mph.

Zone 616-623 (South Cascades):

MORNING

Mixing height below 1000 ft early rising to 2500 - 3500 ft by late morning.

Transport wind SSE to SW at 5 - 9 mph.

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

AFTERNOON

Mixing height rising to 3700 - 4700 ft.

Transport wind SSW to WSW at 8 - 12 mph.

Surface wind increases to SSW to WSW at 4 - 8 mph.

EVENING

Mixing height 1000 - 2000 ft.

Transport wind SW to W at 4 - 8 mph.

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

OUTLOOK:

FRIDAY

Mixing height 1900 to 2900 ft during the morning rising to 4000 to 5000 ft during the afternoon.  Transport wind S to SSW at 9 - 15 mph.  Surface wind SE to S at 4 - 8 mph during the morning becoming SSW to WSW at 4 - 8 mph during the afternoon.

SATURDAY

Mixing height 2000 to 3000 ft during the morning rising to 3600 to 4600 ft during the afternoon.  Transport wind SSW to SW at 10 - 16 mph.  Surface wind light and variable.

SUNDAY

Mixing height 2900 to 3900 ft during the morning rising above 5000 ft during the afternoon.  Transport wind SW to WSW at 25 - 45 mph during the morning becoming WSW to W at 23 - 41 mph during the afternoon.  Surface wind SSW to WSW at 9 - 15 mph during the morning becoming SW to W at 9 - 15 mph during the afternoon.

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

These instructions are valid for burning conducted on Thursday, October 21, 2010.

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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 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 15 miles apart, and 15 miles from downwind SSRAs.

Siskiyous

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

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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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