SMI West (Smoke Management Instructions) (no subject)

Mon Apr 25 13:35:22 PDT 2011

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS

SALEM FORESTRY WEATHER CENTER

OREGON DEPARTMENT OF FORESTRY

ISSUED: Monday, April 25, 2011       2:30 PM      Jim Little

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

    TUESDAY

Upper troughiness slowly gives way to weak ridging aloft during the day on Tuesday.  Only limited moisture is available but I can't rule out the possibility of some light rain during the day.  Transport winds will be mostly southwesterly but not as brisk as on Monday.  Smoke dispersal conditions will be generally fair except good for the South Coast Range.

    OUTLOOK (WEDNESDAY - FRIDAY)

The weak ridging moves east during the day on Wednesday as an upper low moves across the southern Gulf of Alaska toward Vancouver Island.  An associated cold front moves into northwest Oregon late in the day.  Mixing heights will be up from Tuesday but transport winds will be fairly light and generally from the south southwest.

The upper low drifts across southern British Columbia on Thursday and another surge of moisture moves in for renewed precipitation.  Much cooler aloft will push mixing heights to above 5000 feet and brisk southwesterly transport winds will be the rule.  This should give good smoke dispersal conditions.  On Friday post frontal showers continue with transport winds becoming westerly and diminishing.  Upper level ridging is beginning to build and shift over the area from the west and should lead to dry weather for the weekend.  Mixing heights max out at 5000 feet or above and westerly transport winds indicate good smoke dispersal conditions for Friday.

2.  DISPERSION

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

MORNING

Mixing height 1800 - 2800 ft.

Transport wind SW to WSW at 10 - 22 mph.

Surface wind SSW to WSW at 8 - 14 mph.

AFTERNOON

Mixing height rising to 3300 - 4300 ft.

Transport wind decreases to SW to W at 8 - 12 mph.

Surface wind SW to W at 6 - 10 mph.

EVENING

Mixing height lowers below 1000 ft.

Transport wind similar to afternoon.

Surface wind becomes light and variable and controlled by local terrain.

Zone 605-611 (North Cascades):

MORNING

Mixing height 2500 - 3500 ft.

Transport wind SSW to SW at 9 - 15 mph.

Surface wind SSW to SW at 9 - 15 mph.

AFTERNOON

Mixing height 2500 - 3500 ft.

Transport wind S to SW at 6 - 12 mph.

Surface wind S to SW at 6 - 12 mph.

EVENING

Mixing height lowers below 1000 ft.

Transport wind SSW to WSW at 4 - 8 mph.

Surface wind becomes light and variable and controlled by local terrain.

Zone 615-620 (South Coast Range):

MORNING

Mixing height 2900 - 3900 ft.

Transport wind SW to WNW at 4 - 8 mph.

Surface wind SW to WNW at 4 - 8 mph.

AFTERNOON

Mixing height rising to 4300 - 5000 ft.

Transport wind shifts to WNW to NNW at 8 - 12 mph.

Surface wind shifts to WNW to NNW at 8 - 12 mph.

EVENING

Mixing height 1000 - 2000 ft.

Transport wind WNW to NNW at 5 - 9 mph.

Surface wind WNW to NNW at 4 - 8 mph.

Zone 616-623 (South Cascades):

MORNING

Mixing height 2300 - 3300 ft.

Transport wind light and variable.

Surface wind light and variable and controlled by local terrain.

AFTERNOON

Mixing height rising to 3500 - 4500 ft.

Transport wind increases to WNW to NNW at 4 - 8 mph.

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

EVENING

Mixing height lowers below 1000 ft.

Transport wind becomes light and variable.

Surface wind becomes light and variable and controlled by local terrain.

OUTLOOK:

WEDNESDAY

Mixing height 2200 to 3200 ft during the morning rising to 3400 to 4400 ft during the afternoon.  Transport wind SSW to WSW at 10 - 16 mph.  Surface wind SSW to WSW at 8 - 12 mph.

THURSDAY

Mixing height below 1000 ft early rising to 2000 to 3000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind SSW to WSW at 4 - 8 mph.  Surface wind SSW to WSW at 4 - 8 mph.

FRIDAY

Mixing height below 1000 ft early rising to 2000 to 3000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind SW to WSW at 8 - 12 mph during the morning becoming WSW to NW at 6 - 12 mph during the afternoon.  Surface wind SW to W at 4 - 8 mph.

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

These instructions are valid for burning conducted on Tuesday, April 26, 2011.

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

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

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

Units should be 2000 tons or less, spaced 8 miles apart, and 10 miles from downwind SSRAs.

Zone 619

Units should be 1500 tons or less, spaced 8 miles apart, and 10 miles from downwind SSRAs.

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.  South of T30S in Zone 616 units should be 500 tons or less, spaced 8 miles apart.

Zone 611

Units should be 750 tons or less, spaced 10 miles apart, and 12 miles from downwind SSRAs.

Zone 620 and 622

Units should be 500 tons or less, spaced 8 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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