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

Sat May 1 14:30:18 PDT 2010

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS

SALEM FORESTRY WEATHER CENTER

OREGON DEPARTMENT OF FORESTRY

ISSUED: Saturday, May 1, 2010       2:30 PM      Pete Parsons

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

    SUNDAY

An offshore upper-level ridge will build closer to the coastline with the strong northwesterly flow aloft temporarily weakening.  A warm front will increase the clouds across the region during the day with a little rain possible in the north. Smoke dispersion should remain fair to good with onshore flow.  Snow levels will rise above 6000 feet.  Surface temperatures should recover close to normal.

    OUTLOOK (MONDAY-WEDNESDAY)

A strong cold front is forecast to bring more rain and mountain snow Monday, with snow levels dropping to 3000 feet north and 4000 feet south Monday afternoon.  Tuesday looks very cool and unstable with numerous showers and a good chance of afternoon thunderstorms.  Shower activity will decrease Wednesday, as the air mass slowly begins to warm.  Daytime smoke dispersal should be good.  Cold nighttime temperatures could make for low early morning mixing heights, especially on Wednesday.  Temperatures will be unseasonably cool with strong onshore flow.  The snow level could drop to below 2000 feet on Tuesday.

2.  DISPERSION

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

MORNING

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

Transport wind SSW to WSW at 4 - 8 mph.

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

AFTERNOON

Mixing height rising to 3000 - 4000 ft.

Transport wind increases to SW to WSW at 15 - 25 mph.

Surface wind increases to SSW to WSW at 10 - 16 mph.

EVENING

Mixing height 3500 - 4500 ft.

Transport wind SW at 18 - 32 mph.

Surface wind SSW to SW at 9 - 15 mph.

Zone 605-611 (North Cascades):

MORNING

Mixing height 2000 - 3000 ft.

Transport wind SSW to WSW at 4 - 8 mph.

Surface wind SSW to WSW at 5 - 9 mph.

AFTERNOON

Mixing height rising above 5000 ft.

Transport wind increases to SSW to WSW at 12 - 22 mph.

Surface wind SSW to WSW at 9 - 15 mph.

EVENING

Mixing height 3500 - 4500 ft.

Transport wind SSW to SW at 15 - 25 mph.

Surface wind SSW to SW at 10 - 16 mph.

Zone 615-620 (South Coast Range):

MORNING

Mixing height below 1000 ft early rising to 3000 - 4000 ft by late morning.

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

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

AFTERNOON

Mixing height 3000 - 4000 ft.

Transport wind increases to WNW to NW at 8 - 12 mph.

Surface wind increases to WNW to NNW at 6 - 10 mph.

EVENING

Mixing height lowers below 1000 ft.

Transport wind W to NW at 5 - 9 mph.

Surface wind similar to afternoon.

Zone 616-623 (South Cascades):

MORNING

Mixing height 2500 - 3500 ft.

Transport wind NW to N at 8 - 12 mph.

Surface wind NW to N at 5 - 9 mph.

AFTERNOON

Mixing height rising above 5000 ft.

Transport wind NW to NNW at 8 - 12 mph.

Surface wind WNW to NNW at 6 - 10 mph.

EVENING

Mixing height lowers below 1000 ft.

Transport wind W to NW at 4 - 8 mph.

Surface wind W to NW at 4 - 8 mph.

OUTLOOK:

MONDAY

Mixing height 3000 to 4000 ft during the morning rising above 5000 ft during the afternoon.  Transport wind SW to WSW at 14 - 28 mph during the morning becoming WNW to NW at 13 - 25 mph during the afternoon.  Surface wind SW to W at 10 - 18 mph during the morning becoming WNW to NNW at 10 - 18 mph during the afternoon.

TUESDAY

Mixing height 2300 to 3300 ft during the morning rising above 5000 ft during the afternoon.  Transport wind W to NW at 10 - 18 mph during the morning becoming WNW to NNW at 13 - 25 mph during the afternoon.  Surface wind WNW to NNW at 9 - 15 mph.

WEDNESDAY

Mixing height below 1000 ft early rising to 2300 to 3300 ft by late morning rising above 5000 ft during the afternoon.  Transport wind WNW to NNW at 8 - 14 mph.  Surface wind NW to N at 6 - 10 mph.

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

These instructions are valid for burning conducted on Sunday, May 2, 2010.

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

Coast Range

Zone 601 and 612

Units should be 750 tons or less, spaced 10 miles apart, and 12 miles from downwind SSRAs.  Restrict units in or near corridors to 500 tons or less.  North of Tillamook in Zone 601, use standard guidance matrix. (See section 5 below.)

Zone 602 and 603

Units should be 300 tons or less, spaced 10 miles apart, and 12 miles from downwind SSRAs.  North of T3N in Zone 602, use standard guidance matrix. (See section 5 below.)  Avoid burning in or near corridors.  Units may be 500 tons or less, spaced 10 miles apart, south of the Siuslaw River in Zone 603.

Zone 615 and 616 west of R8W

Units should be 1000 tons or less, spaced 10 miles apart, and 12 miles from downwind SSRAs.

Zone 616 east of R9W

Units should be 500 tons or less, spaced 10 miles apart, and 12 miles from downwind SSRAs.

Zone 618

Units should be 2000 tons or less, spaced 10 miles apart, and 12 miles from downwind SSRAs.

Zone 619

Units should be 1500 tons or less, spaced 10 miles apart, and 12 miles from downwind SSRAs.

Zone 620

No burning allowed.  Some burning allowed south of T35S.  Call the forecaster.

Cascades

Zone 605, 606, 607, 608, 609, 610, 616, 617, and 623

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.  South of T30S in Zone 616 units should be 500 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.

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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