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

Fri Apr 10 14:32:17 PDT 2009

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

ISSUED: Friday, April 10, 2009       2:30 PM      Nick Yonker

****Smoke management will begin staffing the office 7 days-a-week beginning this Sunday, April 12th.  This will continue until burning declines considerably toward the beginning of summer.  Please call 503-945-7401 if you have questions or waivers to the instructions.****

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

Minor upper level ridge builds into the state early Saturday but will provide little in the way of warming and drying.  In fact, a minor disturbance will ride through the ridge and provide clouds and some sprinkles to the northwest corner of the state.  Residual cool air aloft will maintain good mixing levels.  Onshore flow will continue through the day, and along with good mixing heights, will make for good to excellent smoke dispersion.

    OUTLOOK (SUNDAY - TUESDAY)

Upper ridge moves by to the east Sunday giving way to a decent frontal system and upper level trough.  Overrunning moisture will move onto the coast during the morning and spread inland through the morning through the afternoon.  Expect plenty of moisture, especially over the northwest corner of the state.  Front will move through during the later afternoon and evening with considerably cooler air moving in behind.  Snow level will lower from near 6000 ft early Sunday to 4000 ft late Sunday and down to near 2000 ft Monday.  Upper trough will move through Monday providing cool showers.  Trough moves by to the east Tuesday leaving the region under chilly but drier NW flow.  Smoke dispersion will be mostly good to excellent through the period.

2.  DISPERSION

Zone 601-612 (North Coast Range and Cascades):

MORNING
Mixing height above 5000 ft.
Transport wind SSW to WSW at 10 - 20 mph.
Surface wind SSE to SW at 6 - 12 mph.

AFTERNOON
Mixing height above 5000 ft.
Transport wind SW to WSW at 10 - 20 mph.
Surface wind S to SW at 4 - 8 mph.

EVENING
Mixing height 3200 - 4200 ft.
Transport wind S to SW at 10 - 18 mph.
Surface wind similar to afternoon.

Zone 615-623 (South Coast Range and Cascades):

MORNING
Mixing height above 5000 ft.
Transport wind SW to WSW at 8 - 12 mph.
Surface wind SSW to WSW at 5 - 9 mph.

AFTERNOON
Mixing height above 5000 ft.
Transport wind SW to W at 5 - 9 mph.
Surface wind shifts to WSW to WNW at 4 - 8 mph.

EVENING
Mixing height 2200 - 3200 ft.
Transport wind similar to afternoon.
Surface wind becomes light and variable but favors S to W and controlled by local terrain.

OUTLOOK:

SUNDAY
Mixing height 2000 to 3000 ft during the morning rising above 5000 ft during the afternoon.  Transport wind SSW to SW at 12 - 24 mph during the morning becoming WSW to W at 12 - 24 mph during the afternoon.  Surface wind SSE to SSW at 8 - 12 mph during the morning becoming SW to W at 8 - 12 mph during the afternoon.

MONDAY
Mixing height above 5000 ft throughout the day.  Transport wind WSW to W at 12 - 24 mph during the morning becoming W to NW at 12 - 22 mph during the afternoon.  Surface wind SW to W at 6 - 12 mph during the morning becoming W to NW at 8 - 12 mph during the afternoon.

TUESDAY
Mixing height above 5000 ft throughout the day.  Transport wind NW to N at 8 - 12 mph.  Surface wind NW to N at 6 - 10 mph.

3.  BURNING INSTRUCTIONS FOR ALL ZONES IN THE WESTERN OREGON AREA
These instructions are valid for burning conducted on Saturday, April 11, 2009.
=================================================================

Coast Range

Zone 601 and 612
Units should be 1000 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.  North of Tillamook in Zone 601, use standard guidance matrix. (See section 5 below.)

Zone 602, 603, and 620
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.)  Units may be 750 tons or less, spaced 5 miles apart, south of the Siuslaw River in Zone 603.  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.  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

Zone 605, 606, 607, 608, 609, 610, 616, 617, 622, and 623
Use standard guidance matrix. (See section 5 below.)  Ensure adequate distance from downwind SSRAs for smoke to dissipate.  From T18S through T22S in Zone 608 units should be 1000 tons or less, spaced 5 miles apart.

Zone 611 and 620
Units should be 1000 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.

Siskiyous
Units should be 1500 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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