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

Fri May 14 14:25:08 PDT 2010

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS

SALEM FORESTRY WEATHER CENTER

OREGON DEPARTMENT OF FORESTRY

ISSUED: Friday, May 14, 2010       2:30 PM      Pete Parsons

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

    SATURDAY
A transitory upper-level ridge is forecast to move over Oregon for continued mostly dry and warm weather.  There could be an isolated afternoon shower or thunderstorm over the Cascades with weak westerly flow aloft and continued onshore transport winds.

    OUTLOOK (SUNDAY-TUESDAY)

The flow aloft is forecast to turn southwesterly and increase on Sunday with a better chance of afternoon showers and thunderstorms, mainly over the Cascades.  Afternoon mixing should be good with slightly cooler surface temperatures due to increasing onshore flow.  A weather system is forecast to move into northern California, on Monday, with the flow aloft turning southerly over Oregon.  Moist and unstable air will be transported northward across the entire region for a chance of showers or thunderstorms.  Temperatures will cool to below normal.  A transitory upper-level ridge will bring drying on Tuesday with the flow aloft becoming northwesterly.

2.  DISPERSION

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

MORNING

Mixing height below 1000 ft early rising to 1900 - 2900 ft by late morning.

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

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

AFTERNOON

Mixing height rising to 3500 - 4500 ft.

Transport wind increases to WNW to NNW at 5 - 9 mph.

Surface wind increases to WNW to NNW at 5 - 9 mph.

EVENING

Mixing height 1000 - 2000 ft.

Transport wind similar to afternoon.

Surface wind WNW to NNW at 5 - 9 mph.

Zone 605-611 (North Cascades):

MORNING

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

Transport wind W to NW at 4 - 8 mph.

Surface wind W to NW at 4 - 8 mph.

AFTERNOON

Mixing height rising above 5000 ft.

Transport wind similar to morning.

Surface wind similar to morning.

EVENING

Mixing height 1000 - 2000 ft.

Transport wind similar to afternoon.

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

Zone 615-620 (South Coast Range):

MORNING

Mixing height below 1000 ft early rising to 1500 - 2500 ft by late morning.

Transport wind light and variable but favors WSW to NW 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 3500 - 4500 ft.

Transport wind increases to NW to N at 5 - 9 mph.

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

EVENING

Mixing height 1000 - 2000 ft.

Transport wind NW to NNE at 4 - 8 mph.

Surface wind NNW to NNE at 4 - 8 mph.

Zone 616-623 (South Cascades):

MORNING

Mixing height below 1000 ft early rising to 3300 - 4300 ft by late morning.

Transport wind WSW to WNW at 6 - 10 mph.

Surface wind SW to WNW at 6 - 10 mph.

AFTERNOON

Mixing height rising above 5000 ft.

Transport wind W to NNW at 6 - 12 mph.

Surface wind WNW to NW at 8 - 12 mph.

EVENING

Mixing height 1000 - 2000 ft.

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

Surface wind becomes light and variable but favors WNW to NNW and controlled by local terrain.

OUTLOOK:

SUNDAY

In the north mixing height below 1000 ft early rising to 1800 to 2800 ft by late morning rising to 4000 to 5000 ft during the afternoon.  In the south 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 SSW to WSW at 4 - 8 mph.  Surface wind light and variable during the morning becoming WSW to WNW at 4 - 8 mph during the afternoon.

MONDAY

In the Coast Range mixing height below 1000 ft early rising to 2500 to 3500 ft by late morning lowering below 1000 ft during the afternoon.  In the Cascades mixing height below 1000 ft early rising to 3500 to 4500 ft by late morning lowering below 1000 ft during the afternoon.  Transport wind SE to SSW at 6 - 10 mph during the morning becoming S to SW at 8 - 14 mph during the afternoon.  Surface wind light and variable during the morning becoming SSW to WSW at 5 - 9 mph during the afternoon.

TUESDAY

In the Coast Range mixing height 2500 to 3500 ft during the morning lowering below 1000 ft during the afternoon.  In the Cascades mixing height 3500 to 4500 ft during the morning lowering below 1000 ft during the afternoon.  Transport wind SE to SSW at 6 - 10 mph during the morning becoming WSW to WNW at 8 - 12 mph during the afternoon.  Surface wind SSW to W at 4 - 8 mph during the morning becoming W to NW 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, May 15, 2010.

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Coast Range

Zone 601 and 612

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.

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 the Siuslaw River in Zone 603.  Call the forecaster.

Zone 615

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

Zone 616 west of R8W

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

Zone 616 east of R9W and 620

Units should be 500 tons or less, spaced 8 miles apart, and 10 miles from downwind SSRAs.  Higher tonnage is possible south of T35S in Zone 620.  Call the forecaster.

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.  From T12S through T17S in Zone 608 units should be 1000 tons or less, spaced 5 miles apart.

Zone 610 and 622

Units should be 1000 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.  East of R2W in Zone 622, use standard guidance matrix. (See section 5 below.)

Zone 620

Units should be 500 tons or less, spaced 5 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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