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

Thu May 13 14:33:28 PDT 2010

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS

SALEM FORESTRY WEATHER CENTER

OREGON DEPARTMENT OF FORESTRY

ISSUED: Thursday, May 13, 2010       2:30 PM      Pete Parsons

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

    FRIDAY

A weak upper-level disturbance will slightly flatten the ridge over Oregon with increasing northwesterly flow aloft.  The air mass will destabilize enough for a chance of afternoon and early evening mountain thunderstorms.  The surface thermal trough will begin the day west of the Cascades but shift into central Oregon in the afternoon.  Light north to northwesterly transport winds will increase and turn more onshore in the afternoon with fair to good mixing and warm surface temperatures.

    OUTLOOK (SATURDAY-MONDAY)

A transitory upper-level ridge is forecast to move over Oregon Saturday for continued mostly dry and warm weather.  There could be an isolated afternoon shower or thunderstorm over the Cascades with weak westerly flow aloft and continued onshore transport winds.  The flow aloft is forecast to turn southwesterly and increase on Sunday with a better chance of afternoon showers and thunderstorms, mainly over the Cascades.  Mixing should be good with slightly cooler surface temperatures due to increasing onshore flow.  Showery and much cooler weather is likely on Monday.

2.  DISPERSION

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

MORNING

Mixing height below 500 ft early rising to 2000 - 3000 ft by late morning.

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

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

AFTERNOON

Mixing height rising to 3500 - 4500 ft.

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

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

EVENING

Mixing height lowers below 1000 ft after sunset.

Transport wind similar to afternoon.

Surface wind similar to afternoon.

Zone 605-611 (North Cascades):

MORNING

Mixing height below 500 ft early rising to 2500 - 3500 ft by late morning.

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

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

AFTERNOON

Mixing height rising above 5000 ft.

Transport wind increases to NW to N at 5 - 9 mph.

Surface wind increases to NW to N at 6 - 10 mph.

EVENING

Mixing height lowers below 1500 ft after sunset.

Transport wind WNW to NNW at 4 - 8 mph.

Surface wind WNW to NNW at 4 - 8 mph.

Zone 615-620 (South Coast Range):

MORNING

Mixing height below 500 ft early rising to 2000 - 3000 ft by late morning.

Transport wind NW to NNE at 5 - 9 mph.

Surface wind NW to NNE at 5 - 9 mph.

AFTERNOON

Mixing height rising to 3500 - 4500 ft.

Transport wind increases to NW to NNW at 8 - 14 mph.

Surface wind NW to N at 9 - 15 mph.

EVENING

Mixing height lowers below 1500 ft after sunset.

Transport wind WNW to NNW at 6 - 10 mph.

Surface wind WNW to NNW at 5 - 9 mph.

Zone 616-623 (South Cascades):

MORNING

Mixing height below 500 ft early rising above 5000 ft by late morning.

Transport wind light and variable but favors SW to NW and controlled by local terrain.

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

AFTERNOON

Mixing height above 5000 ft.

Transport wind increases to NW to NNW at 8 - 12 mph.

Surface wind increases to NW to NNW at 8 - 12 mph.

EVENING

Mixing height lowers below 2000 ft after sunset.

Transport wind similar to afternoon.

Surface wind similar to afternoon.

OUTLOOK:

SATURDAY

In the Coast Range mixing height below 1000 ft early rising to 2100 to 3100 ft by late morning rising to 3500 to 4500 ft during the afternoon.  In the Cascades mixing height below 1000 ft early rising to 3800 to 4800 ft by late morning rising above 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming W to NW at 5 - 9 mph during the afternoon.  Surface wind light and variable during the morning becoming W to NNW at 6 - 10 mph during the afternoon.

SUNDAY

Mixing height below 1000 ft early rising to 3500 to 4500 ft by late morning rising to 4200 to 5000 ft during the afternoon.  Transport wind S to SW at 6 - 10 mph during the morning becoming WSW to WNW at 8 - 14 mph during the afternoon.  Surface wind SSE to SSW at 4 - 8 mph during the morning becoming SW to WNW at 6 - 12 mph during the afternoon.

MONDAY

Mixing height below 1000 ft early rising to 2400 to 3400 ft by late morning rising above 5000 ft during the afternoon.  Transport wind S to SSW at 10 - 20 mph.  Surface wind S to SW at 9 - 15 mph during the morning becoming SW to W at 10 - 18 mph during the afternoon.

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

These instructions are valid for burning conducted on Friday, May 14, 2010.

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

Coast Range

Zone 601, 612, and 616 east of R9W

Units should be 750 tons or less, spaced 8 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.  Restrict units to 500 tons or less south of T30S in Zone 616.

Zone 602 and 603

Units should be 300 tons or less, spaced 8 miles apart, and 10 miles from downwind SSRAs.  Avoid burning in or near corridors.  Higher tonnage is possible south of the Siuslaw River in Zone 603.  Call the forecaster.

Zone 615

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

Zone 616 west of R8W

Units should be 1200 tons or less, spaced 8 miles apart, and 10 miles from downwind SSRAs.

Zone 618 and 619

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

Zone 620

Units should be 500 tons or less, spaced 8 miles apart, and 10 miles from downwind SSRAs.  Higher tonnage is possible south of the Rogue River.  Call the forecaster.

Cascades

Zone 605, 606, 607, 608, 609, 611, 616, 617, and 623

Use standard guidance matrix. (See section 5 below.)  Ensure adequate distance from downwind SSRAs for smoke to dissipate.  From T12S through T17S in Zone 608 units should be 1000 tons or less, spaced 5 miles apart.  South of T30S in Zone 616 units should be 500 tons or less, spaced 5 miles apart.

Zone 610

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

Zone 620 and 622

Units should be 500 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.

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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