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

Thu Apr 30 14:29:24 PDT 2009

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

ISSUED: Thursday, April 30, 2009       2:30 PM      Nick Yonker

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

Upper level trough has exited eastward and is giving way to a temporary ridge tonight and Friday.  However, the next upper low and front will move up from the southwest later Friday bringing an increased chance of moisture Friday night.  Air mass will stabilize under the ridge with afternoon heating providing fair to good mixing.  Wind flow will be offshore and favor burning in the Coast Range.

    OUTLOOK (SATURDAY - MONDAY)

Upper level low moves in Saturday and weakens but will still produce some light rain or showers over the region during much of the day.  Sunday will see a lull in the showers, and then another trough and front move in on Monday.  This promises to be a stronger system, bringing fairly breezy conditions as well.  Air mass will be mostly unstable during the afternoon and somewhat stable during the morning.  Expect decent smoke dispersion.

2.  DISPERSION

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

MORNING
Mixing height below 1000 ft early rising to 1000 - 2000 ft by late morning.
Transport wind E to SE at 8 - 12 mph.
Surface wind NE to E at 5 - 9 mph.

AFTERNOON
Mixing height 1800 - 2800 ft.
Transport wind similar to morning.
Surface wind similar to morning.

EVENING
Mixing height 1000 - 1800 ft.
Transport wind similar to afternoon.
Surface wind shifts to NNW to NE at 4 - 8 mph.

Zone 605-611 (North Cascades):

MORNING
Mixing height below 1000 ft early rising to 2500 - 3500 ft by late morning.
Transport wind ESE to SE at 8 - 12 mph.
Surface wind light and variable but favors NE to SE and controlled by local terrain.

AFTERNOON
Mixing height 3000 - 4000 ft.
Transport wind similar to morning.
Surface wind increases to NE to E at 5 - 9 mph.

EVENING
Mixing height 1000 - 2000 ft.
Transport wind similar to afternoon.
Surface wind becomes light and variable but favors NE to SE and controlled by local terrain.

Zone 615-620 (South Coast Range):

MORNING
Mixing height below 1000 ft early rising to 1000 - 1800 ft by late morning.
Transport wind ESE to SSE at 5 - 9 mph.
Surface wind light and variable but favors E to SE and controlled by local terrain.

AFTERNOON
Mixing height rising to 3200 - 4200 ft.
Transport wind ESE to SSE at 9 - 15 mph.
Surface wind increases to ENE to ESE at 4 - 8 mph.

EVENING
Mixing height 1700 - 2700 ft.
Transport wind similar to afternoon.
Surface wind shifts to SE to S at 4 - 8 mph.

Zone 616-623 (South Cascades):

MORNING
Mixing height below 1000 ft early rising to 2500 - 3500 ft by late morning.
Transport wind ESE to S at 6 - 12 mph.
Surface wind light and variable but favors E to SE and controlled by local terrain.

AFTERNOON
Mixing height rising above 5000 ft.
Transport wind similar to morning.
Surface wind similar to morning.

EVENING
Mixing height 2000 - 3000 ft.
Transport wind ESE to SSE at 10 - 16 mph.
Surface wind shifts to SE to S at 4 - 8 mph.

OUTLOOK:

SATURDAY
Mixing height 3300 to 4300 ft during the morning rising above 5000 ft during the afternoon.  Transport wind S to SW at 10 - 18 mph.  Surface wind SSE to SW at 6 - 10 mph during the morning becoming SSW to WSW at 6 - 10 mph during the afternoon.

SUNDAY
Mixing height 3000 to 4000 ft during the morning rising above 5000 ft during the afternoon.  Transport wind SSW to WSW at 8 - 14 mph.  Surface wind SSW to WSW at 5 - 9 mph.

MONDAY
Mixing height 3200 to 4200 ft during the morning rising above 5000 ft during the afternoon.  Transport wind S to SSW at 18 - 32 mph during the morning becoming S to SSW at 22 - 40 mph during the afternoon.  Surface wind SSE to SSW at 10 - 16 mph.

3.  BURNING INSTRUCTIONS FOR ALL ZONES IN THE WESTERN OREGON AREA
These instructions are valid for burning conducted on Friday, May 1, 2009.
=================================================================

Coast Range

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

Cascades

Zone 605 and 606
Units should be 300 tons or less, spaced 10 miles apart, and 12 miles from downwind SSRAs.

Zone 607 and 608
Units should be 750 tons or less, spaced 10 miles apart, and 12 miles from downwind SSRAs.

Zone 609, 610, and 611
Units should be 1000 tons or less, spaced 10 miles apart, and 12 miles from downwind SSRAs.

Zone 616
Units should be 1000 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.

Zone 617, 620, and 622
Units should be 1500 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.

Zone 623
Use standard guidance matrix. (See section 5 below.)

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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