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

Thu May 27 14:44:11 PDT 2010

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS

SALEM FORESTRY WEATHER CENTER

OREGON DEPARTMENT OF FORESTRY

ISSUED: Thursday, May 27, 2010       2:30 PM      Pete Parsons

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

    FRIDAY

An upper-level trough axis is forecast to shift over western Oregon in the pre-dawn hours and east of the Cascades by midday.  The flow aloft will switch from southeasterly, ahead of the trough axis, to northwesterly in its wake.  Ample moisture will continue to circulate into the northern zones to produce showers or areas of rain.  Meanwhile, showers will taper off across the southern zones with some afternoon clearing.  Maximum temperatures will remain well below normal with the snow level staying near 5000 feet.  Cool air aloft will maintain good daytime smoke dispersal conditions.

    OUTLOOK (SATURDAY-MONDAY)

A transitory and weak upper-level ridge is forecast to bring a drying northwesterly flow aloft on Saturday.  Northern zones may still pick up a little early morning rain with dry conditions prevailing across all zones by the afternoon.  Temperatures will recover close to normal in the southern zones but stay well below normal in the north.  Clearing skies will lead to cold overnight temperatures Saturday night with inversions trapping residual smoke near the ground.  Most of Sunday will remain dry with some sunshine and fair to good daytime smoke dispersal conditions.  Temperatures will rebound to near normal across the northern zones and to slightly above normal in the south.  Clouds and rain will spread from northwest to southeast across the region late Sunday and early Monday.  Monday will likely be mostly cloudy and cooler with some light rain in the north and a chance of showers south.

2.  DISPERSION

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

MORNING

Mixing height below 1500 ft early rising to 3200 - 4200 ft by late morning.

Transport wind WSW to WNW at 10 - 20 mph.

Surface wind WSW to WNW at 9 - 15 mph.

AFTERNOON

Mixing height 3500 - 4500 ft.

Transport wind W to WNW at 13 - 25 mph.

Surface wind W to NW at 9 - 15 mph.

EVENING

Mixing height 2000 - 3000 ft.

Transport wind similar to afternoon.

Surface wind WSW to WNW at 8 - 12 mph.

Zone 615-620 (South Coast Range):

MORNING

Mixing height below 1500 ft early rising to 3300 - 4300 ft by late morning.

Transport wind NW to N at 6 - 10 mph.

Surface wind NNW to NNE at 6 - 10 mph.

AFTERNOON

Mixing height 4000 - 5000 ft.

Transport wind NW to NNW at 10 - 16 mph.

Surface wind NW to N at 10 - 16 mph.

EVENING

Mixing height 1500 - 2500 ft.

Transport wind NNW to NNE at 10 - 18 mph.

Surface wind NNW to NNE at 9 - 15 mph.

Zone 616-623 (South Cascades):

MORNING

Mixing height below 1500 ft early rising to 3300 - 4300 ft by late morning.

Transport wind WNW to NNW at 8 - 12 mph.

Surface wind WNW to NNW at 8 - 12 mph.

AFTERNOON

Mixing height rising above 5000 ft.

Transport wind NW to NNW at 10 - 16 mph.

Surface wind NW to N at 10 - 16 mph.

EVENING

Mixing height 1500 - 2500 ft.

Transport wind NW to N at 9 - 15 mph.

Surface wind NNW to NNE at 8 - 12 mph.

OUTLOOK:

SATURDAY

In the north mixing height below 1000 ft early rising to 2200 to 3200 ft by late morning rising to 4000 to 5000 ft during the afternoon.  In the south mixing height below 1000 ft early rising to 3000 to 4000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind NW to N at 5 - 9 mph.  Surface wind light and variable during the morning becoming NW to NNE at 6 - 12 mph during the afternoon.

SUNDAY

Mixing height below 1000 ft early rising to 3200 to 4200 ft by late morning rising to 4100 to 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming SW to WNW at 6 - 10 mph during the afternoon.  Surface wind light and variable during the morning becoming WSW to WNW at 5 - 9 mph during the afternoon.

MONDAY

Mixing height below 1000 ft early rising to 3200 to 4200 ft by late morning rising above 5000 ft during the afternoon.  Transport wind SSW to SW at 9 - 15 mph.  Surface wind SSW to W at 6 - 10 mph.

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

These instructions are valid for burning conducted on Friday, May 28, 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.

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, 616, 617, and 623

Use standard guidance matrix. (See section 5 below.)  Ensure adequate distance from downwind SSRAs for smoke to dissipate.  From T15S through T20S in Zone 608 units should be 1000 tons or less, spaced 8 miles apart.  South of T30S in Zone 616 units should be 500 tons or less, spaced 5 miles apart.

Zone 610 and 611

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 5 miles apart, and 10 miles from downwind SSRAs.  East of R2W in Zone 622, use standard guidance matrix. (See section 5 below.)

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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