SMI West (Smoke Management Instructions) (no subject)

Tue Apr 19 14:15:49 PDT 2011

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS

SALEM FORESTRY WEATHER CENTER

OREGON DEPARTMENT OF FORESTRY

ISSUED: Tuesday, April 19, 2011       2:30 PM      Jim Little

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

    WEDNESDAY

Upper level charts show a broad trough over the eastern Pacific and the western US for Wednesday.  An upper level jet cuts across the coastline into central California.  This leaves Oregon on the cool side of the jet stream and air mass temperatures will remain well below average for this time of year.  There will be only limited moisture available but showers are likely, especially south.  The cold air aloft will help push mixing heights to high values and smoke dispersal conditions should be good.

    OUTLOOK (THURSDAY - SATURDAY)

On Thursday an upper disturbance swings down from the northwest and phases with a disturbance moving westward across the Pacific to carve out a fairly sharp trough over the eastern Pacific and western US.  This should bring rain or snow to most areas.  The snow level will be down to about 2000 feet in the north and 3000 feet in the south.  Smoke dispersal conditions will remain good.

The upper disturbances move east on Friday allowing weak ridging over the region.  Weather should be dry.  Mixing heights will be suppressed slightly but smoke dispersal conditions remain fair to good.  Low level flow will be offshore - northeast winds in the north, southeast winds in the south. The ridge moves east Saturday and a Pacific front moves in from the west.  Rain reaches the coastline early in the day and spreads east with rainfall amounts ranging to above a half an inch.  Expect fair to good smoke dispersal conditions Saturday.

2.  DISPERSION

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

MORNING

Mixing height 1700 - 2700 ft.

Transport wind NNW to NE at 4 - 8 mph.

Surface wind light and variable and controlled by local terrain.

AFTERNOON

Mixing height rising above 5000 ft.

Transport wind increases to NW to NNW at 10 - 22 mph.

Surface wind increases to NW to NNW at 9 - 15 mph.

EVENING

Mixing height 3300 - 4300 ft.

Transport wind NW to NNW at 13 - 25 mph.

Surface wind similar to afternoon.

Zone 605-611 (North Cascades):

MORNING

Mixing height 1600 - 2600 ft.

Transport wind light and variable.

Surface wind light and variable and controlled by local terrain.

AFTERNOON

Mixing height rising above 5000 ft.

Transport wind increases to WSW to NW at 4 - 8 mph.

Surface wind increases to WSW to NW at 4 - 8 mph.

EVENING

Mixing height 1500 - 2500 ft.

Transport wind similar to afternoon.

Surface wind similar to afternoon.

Zone 615-620 (South Coast Range):

MORNING

Mixing height 1700 - 2700 ft.

Transport wind WNW to NNW at 4 - 8 mph.

Surface wind NW to N at 5 - 9 mph.

AFTERNOON

Mixing height rising above 5000 ft.

Transport wind WNW to NNW at 8 - 12 mph.

Surface wind WNW to NNW at 6 - 12 mph.

EVENING

Mixing height 3000 - 4000 ft.

Transport wind NW to N at 5 - 9 mph.

Surface wind NW to N at 4 - 8 mph.

Zone 616-623 (South Cascades):

MORNING

Mixing height 3800 - 4800 ft.

Transport wind SW to W at 8 - 12 mph.

Surface wind SW to W at 8 - 14 mph.

AFTERNOON

Mixing height above 5000 ft.

Transport wind SSW to WSW at 4 - 8 mph.

Surface wind SSW to WSW 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:

THURSDAY

In the Coast Range mixing height 3300 to 4300 ft throughout the day.  In the Cascades mixing height 1600 to 2600 ft during the morning rising to 4200 to 5000 ft during the afternoon.  Transport wind WNW to NNW at 6 - 10 mph.  Surface wind WNW to NNW at 4 - 8 mph during the morning becoming NW to NNW at 9 - 15 mph during the afternoon.

FRIDAY

In the Coast Range mixing height below 1000 ft early rising to 3300 to 4300 ft by late morning and through the afternoon.  In the Cascades mixing height below 1000 ft early rising to 1600 to 2600 ft by late morning rising to 4200 to 5000 ft during the afternoon.  Transport wind E to SE at 4 - 8 mph during the morning becoming light and variable during the afternoon.  Surface wind E to SE at 4 - 8 mph during the morning becoming light and variable during the afternoon.

SATURDAY

Mixing height below 1000 ft during the morning rising to 3900 to 4900 ft during the afternoon.  Transport wind SE to SSW at 6 - 12 mph during the morning becoming SSW to SW at 8 - 14 mph during the afternoon.  Surface wind light and variable during the morning becoming SSE to SW at 4 - 8 mph during the afternoon.

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

These instructions are valid for burning conducted on Wednesday, April 20, 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.  Higher tonnage is possible south of Waldport in Zone 612.  Call the forecaster.

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 T17S 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

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 5 miles apart.

Zone 610 and 611

Units should be 1000 tons or less, spaced 5 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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