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

Thu Oct 7 15:04:20 PDT 2010

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS

SALEM FORESTRY WEATHER CENTER

OREGON DEPARTMENT OF FORESTRY

ISSUED: Thursday, October 7, 2010       2:30 PM      Pete Parsons

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

FRIDAY

A blocking pattern in the upper-level flow will break down, as the trough over Nevada gets ejected eastward to over the northern Rockies.  That will increase the westerly flow aloft and open the door for a series of Pacific storms to come onshore.  The first front will spread clouds across much of western Oregon with a chance of light rain along the coast and northern inland locations...mainly in the morning.  Increasing South-southwesterly transport winds will improve ventilation conditions, in the afternoon, ahead of a stronger front forecast to come onshore Friday night.

OUTLOOK (SATURDAY-MONDAY)

Two cold fronts will bring widespread rain to the region Saturday and again on Sunday.  Brisk south-southwesterly transport winds, on Saturday, will veer to more westerly on Sunday, behind the second cold front.  The flow aloft will dry out and turn northwesterly on Monday.  Transport winds will turn northerly, with some offshore flow likely across the southern zones.

2.  DISPERSION

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

MORNING

Mixing height below 1500 ft early rising to 2000 - 3000 ft by late morning.

Transport wind SSE to SSW at 9 - 15 mph.

Surface wind SE to SSW at 4 - 8 mph.

AFTERNOON

Mixing height 3000 - 4000 ft.

Transport wind similar to morning.

Surface wind similar to morning.

EVENING

Mixing height 1500 - 2500 ft.

Transport wind increases to S to SSW at 12 - 24 mph.

Surface wind similar to afternoon.

Zone 605-611 (North Cascades):

MORNING

Mixing height below 1500 ft early rising to 2000 - 3000 ft by late morning.

Transport wind SSE to SSW at 6 - 10 mph.

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

AFTERNOON

Mixing height rising to 3300 - 4300 ft.

Transport wind S to SW at 5 - 9 mph.

Surface wind similar to morning.

EVENING

Mixing height 1000 - 2000 ft.

Transport wind similar to afternoon.

Surface wind similar to afternoon.

Zone 615-620 (South Coast Range):

MORNING

Mixing height below 1500 ft early rising to 2000 - 3000 ft by late morning.

Transport wind SSE to SSW at 8 - 12 mph.

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

AFTERNOON

Mixing height rising to 3300 - 4300 ft.

Transport wind similar to morning.

Surface wind increases to SSE to SSW at 4 - 8 mph.

EVENING

Mixing height 1500 - 2500 ft.

Transport wind similar to afternoon.

Surface wind similar to afternoon.

Zone 616-623 (South Cascades):

MORNING

Mixing height below 1500 ft early rising to 2500 - 3500 ft by late morning.

Transport wind SSE to SSW at 8 - 12 mph.

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

AFTERNOON

Mixing height rising to 4300 - 5000 ft.

Transport wind S to SW at 5 - 9 mph.

Surface wind similar to morning.

EVENING

Mixing height 1000 - 1500 ft.

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

Surface wind similar to afternoon.

OUTLOOK:

SATURDAY

Mixing height 1800 to 2800 ft during the morning rising to 2900 to 3900 ft during the afternoon.  Transport wind S to SSW at 10 - 22 mph.  Surface wind SSE to SSW at 5 - 9 mph.

SUNDAY

Mixing height 1500 to 2500 ft during the morning rising to 3200 to 4200 ft during the afternoon.  Transport wind SW to WSW at 13 - 25 mph during the morning becoming WSW to W at 12 - 24 mph during the afternoon.  Surface wind SSW to WSW at 8 - 12 mph during the morning becoming WSW to WNW at 8 - 12 mph during the afternoon.

MONDAY

Mixing height below 1000 ft early rising to 1500 to 2500 ft by late morning rising to 2600 to 3600 ft during the afternoon.  Transport wind N to NE at 4 - 8 mph.  Surface wind light and variable during the morning becoming NNW to NE 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 Friday, October 8, 2010.

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Coast Range

Zone 601 and 612

Units should be 1000 tons or less, spaced 10 miles apart, and 12 miles from downwind SSRAs.  North of Tillamook in Zone 601, use standard guidance matrix. (See section 5 below.)

Zone 602 and 603

Units should be 500 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.)  Units may be 750 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 1500 tons or less, spaced 10 miles apart, and 12 miles from downwind SSRAs.  Higher tonnage is possible south of T29S in Zone 616.  Call the forecaster.

Zone 616 east of R9W

Units should be 750 tons or less, spaced 10 miles apart, and 12 miles from downwind SSRAs.  Higher tonnage is possible south of T29S.  Call the forecaster.

Zone 618, 619, and 620

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

Cascades

All zones except zone 611

Use standard guidance matrix. (See section 5 below.)  Ensure adequate distance from downwind SSRAs for smoke to dissipate.  Verify transport winds away from SSRA if burning within 10 miles of the SSRA in Zone 605 and 606.  Avoid ignitions north of T24S in Zone 616.

Zone 611

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

Siskiyous

Units should be 1000 tons or less, spaced 8 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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