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

Thu May 20 14:20:24 PDT 2010

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS

SALEM FORESTRY WEATHER CENTER

OREGON DEPARTMENT OF FORESTRY

ISSUED: Thursday, May 20, 2010       2:30 PM      Pete Parsons

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

    FRIDAY

A cold upper-level trough will remain over the entire Pacific Northwest.  Another cold front will bring rain to most of western Oregon in the morning, followed by cool showery conditions in the afternoon and evening.  Maximum temperatures will be 10-15 degrees below normal with accumulating snow at elevations above 3000 feet.  High mixing heights will make for good smoke dispersal conditions.

    OUTLOOK (SATURDAY-MONDAY)

The cold upper-level trough remains over Oregon Saturday with numerous showers and snow levels hovering near 3000 feet.  The trough will slowly push east of the region Sunday and Monday with a progressively drier, more stable, and warmer northwesterly flow aloft.  Monday looks mostly dry with only a chance of mainly afternoon mountain showers.  The snow level should lift to around 6000 feet with maximum temperatures recovering to within about 5 degrees of normal. Cool air aloft will maintain high afternoon mixing heights, for good daytime smoke dispersal conditions, with early morning inversions.

2.  DISPERSION

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

MORNING

Mixing height 2400 - 3400 ft.

Transport wind SSE to SSW at 15 - 25 mph.

Surface wind SSW to SW at 9 - 15 mph.

AFTERNOON

Mixing height rising above 5000 ft.

Transport wind shifts to WSW to WNW at 10 - 20 mph.

Surface wind shifts to WSW to NW at 6 - 10 mph.

EVENING

Mixing height 1700 - 2700 ft.

Transport wind similar to afternoon.

Surface wind similar to afternoon.

Zone 605-611 (North Cascades):

MORNING

Mixing height 2100 - 3100 ft.

Transport wind S to SW at 15 - 25 mph.

Surface wind SSW to SW at 8 - 12 mph.

AFTERNOON

Mixing height rising above 5000 ft.

Transport wind SW to WSW at 15 - 25 mph.

Surface wind shifts to WSW to WNW at 9 - 15 mph.

EVENING

Mixing height 1500 - 2500 ft.

Transport wind SW to WSW at 10 - 22 mph.

Surface wind similar to afternoon.

Zone 615-620 (South Coast Range):

MORNING

Mixing height 2700 - 3700 ft.

Transport wind SSW to SW at 15 - 29 mph.

Surface wind SSW to WSW at 10 - 18 mph.

AFTERNOON

Mixing height rising above 5000 ft.

Transport wind shifts to WSW to W at 14 - 28 mph.

Surface wind shifts to WSW to WNW at 9 - 15 mph.

EVENING

Mixing height 2800 - 3800 ft.

Transport wind WSW to W at 10 - 22 mph.

Surface wind WSW to NW at 6 - 10 mph.

Zone 616-623 (South Cascades):

MORNING

Mixing height 2300 - 3300 ft.

Transport wind SW to WSW at 15 - 25 mph.

Surface wind SSW to WSW at 8 - 12 mph.

AFTERNOON

Mixing height rising above 5000 ft.

Transport wind WSW to W at 15 - 25 mph.

Surface wind WSW to WNW at 9 - 15 mph.

EVENING

Mixing height 1900 - 2900 ft.

Transport wind SW to W at 12 - 22 mph.

Surface wind WSW to WNW at 6 - 12 mph.

OUTLOOK:

SATURDAY

Mixing height 2400 to 3400 ft during the morning rising above 5000 ft during the afternoon.  Transport wind SW to WSW at 8 - 12 mph during the morning becoming W to NW at 8 - 12 mph during the afternoon.  Surface wind SW to W at 6 - 10 mph during the morning becoming W to NW at 8 - 12 mph during the afternoon.

SUNDAY

Mixing height below 1000 ft early rising to 2400 to 3400 ft by late morning rising above 5000 ft during the afternoon.  Transport wind WNW to NNW at 8 - 12 mph.  Surface wind NW to N at 4 - 8 mph.

MONDAY

Mixing height below 1000 ft early rising to 3500 to 4500 ft by late morning rising above 5000 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 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 Friday, May 21, 2010.

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Coast Range

Zone 601 and 612

Units should be 1000 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.  Restrict units in or near corridors to 500 tons or less.

Zone 602, 603, and 620

Units should be 500 tons or less, spaced 5 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.  Higher tonnage is possible south of T35S in Zone 620.  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.  Higher tonnage is possible south of T29S.  Call the forecaster.

Zone 616 east of R9W

Units should be 750 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.  Higher tonnage is possible south of T29S.  Call the forecaster.

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.

Cascades

All zones except zone 611

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 1000 tons or less, spaced 5 miles apart.

Zone 611

Units should be 1000 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.

Siskiyous

Units should be 1000 tons or less, spaced 5 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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