SMI West (Smoke Management Instructions) (no subject)

Tue Oct 26 14:29:24 PDT 2010

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS

SALEM FORESTRY WEATHER CENTER

OREGON DEPARTMENT OF FORESTRY

ISSUED: Tuesday, October 26, 2010       2:30 PM      Jim Little

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

    WEDNESDAY

A ridge of high pressure in the upper atmosphere covers the Pacific Northwest on Wednesday but an upper level low is also intensifying about 450 miles west of Brookings.  Skies will be partly cloudy but increase during the afternoon.  Transport winds will be generally offshore from the southeast or east.  Mixing heights will be somewhat suppressed during the day.  Rain will reach the southwest coast by evening and spread north and east overnight.

    EXTENDED OUTLOOK (THURSDAY - SATURDAY)

The upper level low moves to about 400 miles west of San Francisco on Thursday.  Upper flow over Oregon backs to southwesterly.  Rain falls throughout the day most areas but amounts will be around a third of an inch.  Freezing levels push to around 8-9000 feet.  Southerly through easterly transport winds will be the rule.  On Friday the upper level low drops southward to off the southern California coast.  Very limited moisture remains over the Pacific Northwest for mostly dry conditions.  Smoke dispersal conditions remain marginal but the easterly or offshore component continues at low levels to present burn opportunities not normally available with the prevailing southwesterlys this time of year.  On Saturday the upper low opens up and moves northeast as a weak upper level trough.  Smoke dispersal conditions will improve and transport winds will shift to southerly.

2.  DISPERSION

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

MORNING

Mixing height 1100 - 2100 ft.

Transport wind ENE to E at 10 - 18 mph.

Surface wind NE to E at 8 - 12 mph.

AFTERNOON

Mixing height 1700 - 2700 ft.

Transport wind E to ESE at 10 - 16 mph.

Surface wind ENE to ESE at 4 - 8 mph.

EVENING

Mixing height 1300 - 2300 ft.

Transport wind ESE to SE at 8 - 12 mph.

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

Zone 605-611 (North Cascades):

MORNING

Mixing height 1000 - 2000 ft.

Transport wind E to ESE at 4 - 8 mph.

Surface wind ENE to ESE at 5 - 9 mph.

AFTERNOON

Mixing height rising to 3000 - 4000 ft.

Transport wind ESE to S at 6 - 10 mph.

Surface wind ESE to SSE 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 2100 - 3100 ft.

Transport wind ESE to SSE at 9 - 15 mph.

Surface wind ESE to SSE at 8 - 14 mph.

AFTERNOON

Mixing height 2600 - 3600 ft.

Transport wind decreases to SE to S at 4 - 8 mph.

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

EVENING

Mixing height 2300 - 3300 ft.

Transport wind ESE to SSE at 8 - 14 mph.

Surface wind increases to ESE to SSE at 5 - 9 mph.

Zone 616-623 (South Cascades):

MORNING

Mixing height 1700 - 2700 ft.

Transport wind ESE to SE at 12 - 24 mph.

Surface wind ESE to SSE at 10 - 20 mph.

AFTERNOON

Mixing height 2500 - 3500 ft.

Transport wind ESE to SSE at 10 - 18 mph.

Surface wind ESE to SSE at 8 - 12 mph.

EVENING

Mixing height 2000 - 3000 ft.

Transport wind ESE to SSE at 10 - 22 mph.

Surface wind similar to afternoon.

OUTLOOK:

THURSDAY

In the north mixing height 1400 to 2400 ft throughout the day.  In the south mixing height 2300 to 3300 ft throughout the day.  Transport wind ESE to SSE at 9 - 15 mph.  Surface wind ESE to SSE at 6 - 12 mph.

FRIDAY

Mixing height below 1000 ft early rising to 1000 to 2000 ft by late morning rising to 1600 to 2600 ft during the afternoon.  Transport wind ESE to SSE at 4 - 8 mph.  Surface wind light and variable.

SATURDAY

Mixing height below 1000 ft early rising to 1000 to 2000 ft by late morning rising to 3100 to 4100 ft during the afternoon.  Transport wind light and variable during the morning becoming SE to SSW at 6 - 12 mph during the afternoon.  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, October 27, 2010.

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Coast Range

All Zones

Use standard guidance matrix. (See section 5 below.)  Ensure adequate distance from downwind SSRAs for smoke to dissipate.

Cascades

Zone 605 and 606

Units should be 300 tons or less, spaced 10 miles apart, and 12 miles from downwind SSRAs.

Zone 607, 608, 616, and 617

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

Zone 609, 620, and 623

Use standard guidance matrix. (See section 5 below.)  Ensure adequate distance from downwind SSRAs for smoke to dissipate.

Zone 610, 611, and 622

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

Siskiyous

Units should be 750 tons or less, spaced 10 miles apart, and 12 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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