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

Fri May 7 14:33:32 PDT 2010

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS

SALEM FORESTRY WEATHER CENTER

OREGON DEPARTMENT OF FORESTRY

ISSUED: Friday, May 7, 2010       2:30 PM      Pete Parsons

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

    SATURDAY
Temperatures have moderated back to normal, compared with the unseasonably cold air mass from earlier this week.  Brief morning inversions are likely, but ventilation should be good from the late morning through the afternoon.  The flow aloft will be westerly with a couple of upper-air disturbances possibly triggering a few showers, mainly in the southern zones.  Northwesterly transport winds will increase in the afternoon, as the surface thermal trough shifts from central Oregon into Idaho.

    OUTLOOK (SUNDAY-TUESDAY)
Another upper-level trough will move across southern Oregon and northern California on Sunday.  Scattered showers are likely in the southern zones with a chance of mainly mountain showers in the northern zones.  Mixing should be fair to good from the late morning through the afternoon with west to northwesterly transport winds.  A cold upper-level trough will move over Oregon Monday with showery weather.  Snow levels will drop below 4000 feet.  Showers could linger into Tuesday with a drier northerly flow aloft forecast by Tuesday afternoon.

2.  DISPERSION

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

MORNING

Mixing height below 1000 ft early rising to 3600 - 4600 ft by late morning.

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

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

AFTERNOON

Mixing height above 5000 ft.

Transport wind increases to NW to N at 10 - 16 mph.

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

EVENING

Mixing height 1500 - 2500 ft.

Transport wind similar to afternoon.

Surface wind similar to afternoon.

Zone 605-611 (North Cascades):

MORNING

Mixing height below 1000 ft early rising to 3500 - 4500 ft by late morning.

Transport wind NW to N at 5 - 9 mph.

Surface wind NW to N at 5 - 9 mph.

AFTERNOON

Mixing height rising above 5000 ft.

Transport wind NW to NNW at 8 - 12 mph.

Surface wind NW to NNW at 8 - 12 mph.

EVENING

Mixing height lowers below 2000 ft after sunset.

Transport wind NW to N at 4 - 8 mph.

Surface wind becomes light and variable but favors N to NE and controlled by local terrain.

Zone 615-620 (South Coast Range):

MORNING

Mixing height below 1000 ft early rising to 2000 - 3000 ft by late morning.

Transport wind WNW to NNW at 5 - 9 mph.

Surface wind NW to N at 4 - 8 mph.

AFTERNOON

Mixing height rising above 5000 ft.

Transport wind increases to WNW to NNW at 10 - 16 mph.

Surface wind increases to WNW to NNW at 10 - 16 mph.

EVENING

Mixing height lowers below 2000 ft after sunset.

Transport wind W to NW at 6 - 12 mph.

Surface wind W to NW at 6 - 12 mph.

Zone 616-623 (South Cascades):

MORNING

Mixing height 3500 - 4500 ft.

Transport wind W to NW at 5 - 9 mph.

Surface wind W to NW 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 8 - 12 mph.

EVENING

Mixing height 3200 - 4200 ft.

Transport wind similar to afternoon.

Surface wind NW to N at 6 - 12 mph.

OUTLOOK:

SUNDAY

Mixing height below 1000 ft early rising to 2800 to 3800 ft by late morning rising above 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming W to NW at 10 - 20 mph during the afternoon.  Surface wind light and variable during the morning becoming W to NW at 9 - 15 mph during the afternoon.

MONDAY

Mixing height below 1000 ft early rising to 2000 to 3000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind WSW to NW at 6 - 10 mph during the morning becoming WNW to NW at 8 - 14 mph during the afternoon.  Surface wind W to NW at 6 - 10 mph.

TUESDAY

Mixing height below 1000 ft early rising to 2000 to 3000 ft by late morning rising to 4000 to 5000 ft during the afternoon.  Transport wind NW to NNW at 10 - 16 mph.  Surface wind NW to N at 8 - 12 mph.

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

These instructions are valid for burning conducted on Saturday, May 8, 2010.

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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

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.

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.  East of R2W in Zone 622, use standard guidance matrix. (See section 5 below.)

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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