SMI West (Smoke Management Instructions) Smoke Management Instructions

Wed Apr 28 14:30:06 PDT 2010

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS

SALEM FORESTRY WEATHER CENTER

OREGON DEPARTMENT OF FORESTRY

ISSUED: Wednesday, April 28, 2010       2:30 PM      Pete Parsons

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

    THURSDAY

A cold upper-level trough will shift eastward, to over the northern Rockies, with a northwesterly flow aloft over Oregon.  Snow levels will start out near 2500 feet in the morning and rise to around 3000 feet in the afternoon.  The air mass will still be somewhat unstable with daytime heating increasing shower activity in the afternoon.  Precipitation will be enhanced on western slopes of mountain ranges. Maximum mixing heights will rise above 5000 feet for good to excellent smoke dispersal conditions. Surface temperatures will remain well below normal.

    OUTLOOK (FRIDAY-SUNDAY)

The strong upper-level trough will continue to shift eastward with the flow aloft over Oregon becoming progressively drier and more northerly.  The air mass will remain unstable enough for daytime heating to trigger scattered afternoon and evening showers on Friday with good to excellent smoke dispersion.  Skies will begin clearing Saturday and Sunday with only a slight chance of afternoon showers...mainly over the northern mountains.  Smoke dispersion should be fair to good on Saturday and fair on Sunday.  The snow level will rise from 3000 feet on Friday to 6500 feet by Sunday, with surface temperatures recovering to near normal by Sunday.

2.  DISPERSION

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

MORNING

Mixing height 2800 - 3800 ft.

Transport wind WNW to NW at 12 - 24 mph.

Surface wind W to NW at 10 - 18 mph.

AFTERNOON

Mixing height rising above 5000 ft.

Transport wind similar to morning.

Surface wind similar to morning.

EVENING

Mixing height 2400 - 3400 ft.

Transport wind similar to afternoon.

Surface wind WNW to NW at 9 - 15 mph.

Zone 605-611 (North Cascades):

MORNING

Mixing height 2500 - 3500 ft.

Transport wind SW to W at 8 - 12 mph.

Surface wind WSW to WNW at 8 - 12 mph.

AFTERNOON

Mixing height rising above 5000 ft.

Transport wind W to NW at 10 - 20 mph.

Surface wind W to NW at 9 - 15 mph.

EVENING

Mixing height 2200 - 3200 ft.

Transport wind similar to afternoon.

Surface wind similar to afternoon.

Zone 615-620 (South Coast Range):

MORNING

Mixing height 2800 - 3800 ft.

Transport wind WNW to NW at 8 - 12 mph.

Surface wind W to NNW at 6 - 12 mph.

AFTERNOON

Mixing height rising above 5000 ft.

Transport wind WNW to NNW at 10 - 20 mph.

Surface wind WNW to NNW at 10 - 16 mph.

EVENING

Mixing height 2100 - 3100 ft.

Transport wind WNW to NNW at 9 - 15 mph.

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

Zone 616-623 (South Cascades):

MORNING

Mixing height 2300 - 3300 ft.

Transport wind WSW to WNW at 6 - 10 mph.

Surface wind WSW to NW at 6 - 10 mph.

AFTERNOON

Mixing height rising above 5000 ft.

Transport wind increases to WNW to NW at 10 - 20 mph.

Surface wind WNW to NW at 10 - 16 mph.

EVENING

Mixing height 2000 - 3000 ft.

Transport wind similar to afternoon.

Surface wind W to NW at 8 - 12 mph.

OUTLOOK:

FRIDAY

Mixing height 2400 to 3400 ft during the morning rising above 5000 ft during the afternoon.  Transport wind WNW to NNW at 9 - 15 mph.  Surface wind W to NNW at 4 - 8 mph during the morning becoming NW to NNW at 10 - 18 mph during the afternoon.

SATURDAY

Mixing height below 1000 ft early rising to 2500 to 3500 ft by late morning rising to 3900 to 4900 ft during the afternoon.  Transport wind NNW to N at 8 - 12 mph.  Surface wind NW to N at 6 - 10 mph.

SUNDAY

Mixing height below 1000 ft early rising to 2800 to 3800 ft by late morning rising to 3800 to 4800 ft during the afternoon.  Transport wind NW to N at 10 - 18 mph.  Surface wind NW to NNE at 5 - 9 mph.

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

These instructions are valid for burning conducted on Thursday, April 29, 2010.

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

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.

Zone 616 east of R9W

Units should be 750 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.  Restrict units to 500 tons or less south of T30S.

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 5 miles apart.

Zone 610, 611, 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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