SMI West (Smoke Management Instructions) (no subject)

Tue Apr 26 14:02:49 PDT 2011

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS

SALEM FORESTRY WEATHER CENTER

OREGON DEPARTMENT OF FORESTRY

ISSUED: Tuesday, April 26, 2011       2:30 PM      Jim Little

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

WEDNESDAY

A weak upper level ridge drifts east out of the state during the day as an upper level low moves toward Vancouver Island.  Low level flow will be onshore to keep skies cloudy, but rain will hold off until late in the day when a weak cold front brings rain to northwest Oregon.  Mixing heights will be high for good smoke dispersal conditions.  Transport winds will be southwesterly except becoming westerly in the afternoon in the southern Cascades.

    OUTLOOK (THURSDAY - SATURDAY)

The upper level low moves eastward across southern British Columbia with a trailing trough moving across Oregon on Thursday.  It will be a wet day.  Rainfall amounts of one-half inch are likely.  Transport winds shift to northwesterly and cool air aloft with the trough will keep mixing heights high for good smoke dispersal conditions.

The upper trough slips east and a ridge of high pressure develops in the eastern Pacific and the Gulf of Alaska on Friday.  This will shift winds aloft to north northwesterly over the region.  In the transport region winds will be mostly northwesterly except northerly in the south. Minor impulses in the upper flow will keep showers going.  Mixing heights will be high enough to provide fair to good smoke dispersal conditions.

By Saturday a surface high noses into western Oregon and a surface thermal trough builds in northern California.  Expect cloudy skies with a chance of drizzle in the north in the morning but otherwise dry weather.  Burn locations that benefit from northerly components to transport winds should be considered for Saturday.

2.  DISPERSION

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

MORNING

Mixing height 4000 - 5000 ft.

Transport wind SSW to WSW at 10 - 16 mph.

Surface wind SSW to SW at 8 - 14 mph.

AFTERNOON

Mixing height above 5000 ft.

Transport wind increases to SW to W at 14 - 28 mph.

Surface wind SW to W at 10 - 20 mph.

EVENING

Mixing height 2000 - 3000 ft.

Transport wind WSW to W at 13 - 25 mph.

Surface wind WSW to WNW at 9 - 15 mph.

Zone 605-611 (North Cascades):

MORNING

Mixing height 2600 - 3600 ft.

Transport wind SSW to WSW at 8 - 14 mph.

Surface wind SSW to WSW at 8 - 14 mph.

AFTERNOON

Mixing height rising to 3800 - 4800 ft.

Transport wind WSW to WNW at 10 - 16 mph.

Surface wind WSW to WNW at 9 - 15 mph.

EVENING

Mixing height 2800 - 3800 ft.

Transport wind similar to afternoon.

Surface wind similar to afternoon.

Zone 615-620 (South Coast Range):

MORNING

Mixing height 4400 - 5000 ft.

Transport wind SW to WNW at 5 - 9 mph.

Surface wind SW to WNW at 5 - 9 mph.

AFTERNOON

Mixing height above 5000 ft.

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

Surface wind increases to WSW to WNW at 10 - 18 mph.

EVENING

Mixing height 2500 - 3500 ft.

Transport wind SW to W at 9 - 15 mph.

Surface wind SW to WNW at 6 - 12 mph.

Zone 616-623 (South Cascades):

MORNING

Mixing height 1800 - 2800 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 WSW to WNW at 8 - 12 mph.

Surface wind WSW to WNW at 8 - 12 mph.

EVENING

Mixing height 1100 - 2100 ft.

Transport wind W to NW at 6 - 12 mph.

Surface wind W to NW at 6 - 10 mph.

OUTLOOK:

THURSDAY

In the north mixing height 2300 to 3300 ft during the morning rising above 5000 ft during the afternoon.  In the south mixing height 1700 to 2700 ft during the morning rising above 5000 ft during the afternoon.  Transport wind SSW to WSW at 6 - 10 mph during the morning becoming WSW to WNW at 8 - 12 mph during the afternoon.  Surface wind SSW to WSW at 5 - 9 mph during the morning becoming WSW to WNW at 6 - 12 mph during the afternoon.

FRIDAY

Mixing height below 1000 ft early rising to 2000 to 3000 ft by late morning rising to 3800 to 4800 ft during the afternoon.  Transport wind WNW to NNW at 5 - 9 mph.  Surface wind light and variable.

SATURDAY

Mixing height below 1000 ft early rising to 2500 to 3500 ft by late morning rising to 3500 to 4500 ft during the afternoon.  Transport wind NNW to NNE at 4 - 8 mph.  Surface wind light and variable.

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

These instructions are valid for burning conducted on Wednesday, April 27, 2011.

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

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.  North of Tillamook in Zone 601, use standard guidance matrix. (See section 5 below.)

Zone 602, 603, and 620

Units should be 500 tons or less, spaced 5 miles apart, and 10 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 750 tons or less, spaced 5 miles apart, south of the Siuslaw River in Zone 603.

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.  Higher tonnage is possible south of T29S.  Call the forecaster.

Zone 616 east of R9W

Units should be 750 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.  Higher tonnage is possible south of T29S.  Call the forecaster.

Zone 618

Use standard guidance matrix. (See section 5 below.)

Zone 619

Units should be 2000 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.

Cascades

All zones except Zone 610 and 611

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.

Zone 610 and 611

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

Siskiyous

Units should be 1000 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.

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

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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