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

Sun May 23 13:56:33 PDT 2010

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS
SALEM FORESTRY WEATHER CENTER
OREGON DEPARTMENT OF FORESTRY

ISSUED: Sunday, May 23, 2010       2:30 PM      Jim Little

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

    MONDAY

Weak upper level ridging ahead of an upper low west of the Queen Charlotte Islands will be the main weather feature of the day.  Low level flow will be onshore for partly cloudy skies, but generally dry weather.  Maximum mixing heights should be above 5000 feet for good smoke dispersal conditions.

    OUTLOOK (TUESDAY-THURSDAY)

A short wave rotates around the upper level low pushing a weak front into the region for renewed precipitation on Tuesday. Expect fair to good smoke dispersal conditions.  On Wednesday the upper low elongates north to south with a moist southerly flow increasing over the region.  This will keep showers going into Thursday.  On Thursday the upper low drops southward to off the Oregon coast.  Expect fair to good smoke dispersal conditions throughout the outlook period.

2.  DISPERSION

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

MORNING
Mixing height 4400 - 5000 ft.
Transport wind S to SW at 6 - 12 mph.
Surface wind S to SW at 6 - 10 mph.

AFTERNOON
Mixing height above 5000 ft.
Transport wind increases to SW to W at 10 - 20 mph.
Surface wind shifts to SW to W at 10 - 16 mph.

EVENING
Mixing height 2100 - 3100 ft.
Transport wind SSW to WSW at 10 - 16 mph.
Surface wind SSW to WSW at 6 - 10 mph.

Zone 605-611 (North Cascades):

MORNING
Mixing height above 5000 ft.
Transport wind SW to W at 4 - 8 mph.
Surface wind SW to W at 5 - 9 mph.

AFTERNOON
Mixing height above 5000 ft.
Transport wind WSW to WNW at 5 - 9 mph.
Surface wind WSW to WNW at 6 - 10 mph.

EVENING
Mixing height 1900 - 2900 ft.
Transport wind WSW to NW at 6 - 12 mph.
Surface wind similar to afternoon.

Zone 615-620 (South Coast Range):

MORNING
Mixing height above 5000 ft.
Transport wind SSW to W at 6 - 12 mph.
Surface wind SSW to WSW at 6 - 12 mph.

AFTERNOON
Mixing height above 5000 ft.
Transport wind increases to SSW to WSW at 12 - 22 mph.
Surface wind SSW to WSW at 10 - 18 mph.

EVENING
Mixing height 2800 - 3800 ft.
Transport wind SSW to SW at 10 - 22 mph.
Surface wind S to SW at 10 - 16 mph.

Zone 616-623 (South Cascades):

MORNING
Mixing height 3600 - 4600 ft.
Transport wind SSW to WSW at 5 - 9 mph.
Surface wind SSW to WSW at 6 - 10 mph.

AFTERNOON
Mixing height above 5000 ft.
Transport wind WSW to WNW at 8 - 14 mph.
Surface wind WSW to WNW at 8 - 14 mph.

EVENING
Mixing height 1600 - 2600 ft.
Transport wind WSW to NW at 6 - 12 mph.
Surface wind WSW to NW at 5 - 9 mph.

OUTLOOK:

TUESDAY
Mixing height 2100 to 3100 ft during the morning rising to 3900 to 4900 ft during the afternoon.  Transport wind SSE to SSW at 5 - 9 mph.  Surface wind light and variable.

WEDNESDAY
Mixing height 2100 to 3100 ft during the morning rising to 4000 to 5000 ft during the afternoon.  Transport wind SSE to SSW at 4 - 8 mph.  Surface wind light and variable.

THURSDAY
Mixing height 2000 to 3000 ft during the morning rising above 5000 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.

3.  BURNING INSTRUCTIONS FOR ALL ZONES IN THE WESTERN OREGON AREA
These instructions are valid for burning conducted on Monday, May 24, 2010.
=================================================================

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.  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 5 miles apart, and 10 miles from downwind SSRAs.  North of T3N in Zone 602, use standard guidance matrix. (See section 5 below.)  Avoid burning in or near corridors.  Units may be 750 tons or less, spaced 5 miles apart, south of the Siuslaw River in Zone 603.

Zone 615 and 620
Units should be 1500 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.  South of T35S in Zone 620 units should be 500 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.  Higher tonnage is possible south of T29S.  Call the forecaster.

Zone 616 east of R9W
Units should be 750 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.  Higher tonnage is possible south of T29S.  Call the forecaster.

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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