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

Sat May 9 14:35:48 PDT 2009

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

ISSUED: Saturday, May 9, 2009       2:30 PM      Nick Yonker

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

Upper level ridge is building over the state today and will be at its peak Sunday morning.  Then it gets shoved eastward by a trough and minor frontal system.  This will set off a marine push over the region Sunday afternoon.  Air mass will be stable during the morning then destabilize fairly well over the interior of the region under decent afternoon heating.  Wind flow will be light and variable during the morning, and then increase from the S to SW during the afternoon.  Smoke dispersion will be poor during the morning, and then improve during the afternoon.

    OUTLOOK (MONDAY - WEDNESDAY)

Ridge gives way to an upper trough and front late Sunday into early Monday.  Most of the moisture will be confined to the northern half of the state.  The upper trough will move by to the east Tuesday with any residual showers decreasing.  Temperatures will be cool with brisk westerly flow.  Air mass will destabilize quickly Monday and remain unstable through Tuesday.  Weak ridging moves in Wednesday but will be overridden by the next front during the afternoon.  Expect more rain and wind.  Expect mostly good to excellent smoke dispersion through the period.

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 light and variable but favors SE to S.
Surface wind light and variable and controlled by local terrain.

AFTERNOON
Mixing height 1800 - 2800 ft.
Transport wind increases to S to SW at 6 - 10 mph.
Surface wind increases to SSW to WSW at 6 - 10 mph.

EVENING
Mixing height lowers below 1000 ft after sunset.
Transport wind increases to SSW to SW at 10 - 22 mph.
Surface wind SSE to SSW at 8 - 14 mph.

Zone 605-611 (North Cascades):

MORNING
Mixing height below 1000 ft early rising to 2000 - 3000 ft by late morning.
Transport wind light and variable but favors SE to S.
Surface wind light and variable and controlled by local terrain.

AFTERNOON
Mixing height rising to 3200 - 4200 ft.
Transport wind increases to SSW to WSW at 6 - 12 mph.
Surface wind similar to morning.

EVENING
Mixing height lowers below 1000 ft after sunset.
Transport wind SSW to WSW at 10 - 18 mph.
Surface wind increases to S to SW at 6 - 10 mph.

Zone 615-620 (South Coast Range):

MORNING
Mixing height below 1000 ft early rising to 1000 - 1800 ft by late morning.
Transport wind light and variable and controlled by local terrain.
Surface wind light and variable and controlled by local terrain.

AFTERNOON
Mixing height rising to 2500 - 3500 ft.
Transport wind increases to SW to W at 8 - 14 mph.
Surface wind increases to SW to W at 6 - 10 mph.

EVENING
Mixing height lowers below 1000 ft after sunset.
Transport wind increases to SW to W at 12 - 22 mph.
Surface wind SSW to WSW at 9 - 15 mph.

Zone 616-623 (South Cascades):

MORNING
Mixing height below 1000 ft early rising to 2300 - 3300 ft by late morning.
Transport wind light and variable but favors SE to SW and controlled by local terrain.
Surface wind light and variable and controlled by local terrain.

AFTERNOON
Mixing height rising above 5000 ft.
Transport wind increases to WSW to WNW at 8 - 14 mph.
Surface wind increases to WSW to WNW at 6 - 12 mph.

EVENING
Mixing height lowers below 1000 ft after sunset.
Transport wind SW to W at 8 - 14 mph.
Surface wind increases to SSW to WSW at 6 - 10 mph.

OUTLOOK:

MONDAY
Mixing height 3500 to 4500 ft during the morning rising above 5000 ft during the afternoon.  In the north transport wind SW to WSW at 18 - 30 mph during the morning becoming SW to W at 12 - 24 mph during the afternoon.  In the south transport wind WSW to WNW at 10 - 18 mph.  Surface wind SSW to WSW at 8 - 14 mph during the morning becoming WSW to WNW at 9 - 15 mph during the afternoon.

TUESDAY
Mixing height 4200 to 5000 ft during the morning rising above 5000 ft during the afternoon.  Transport wind SW to W at 10 - 16 mph during the morning becoming W to NW at 8 - 12 mph during the afternoon.  Surface wind SW to W at 8 - 12 mph during the morning becoming W to NW at 6 - 10 mph during the afternoon.

WEDNESDAY
Mixing height 2500 to 3500 ft during the morning rising above 5000 ft during the afternoon.  Transport wind S to SSW at 12 - 24 mph during the morning becoming SSW to SW at 20 - 35 mph during the afternoon.  Surface wind SSE to SSW at 6 - 12 mph during the morning becoming S to SSW at 10 - 20 mph during the afternoon.

3.  BURNING INSTRUCTIONS FOR ALL ZONES IN THE WESTERN OREGON AREA
These instructions are valid for burning conducted on Sunday, May 10, 2009.
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Coast Range

Zone 601, 612, 615, 616 west of and R8W
Units should be 750 tons or less, spaced 15 miles apart, and 15 miles from downwind SSRAs.  North of Tillamook in Zone 601, use standard guidance matrix. (See section 5 below.)  Higher tonnage is possible south of T29S in Zone 616.  Call the forecaster.

Zone 602 and 603
No burning allowed.  North of T3N in Zone 602, use standard guidance matrix. (See section 5 below.)  Units may be 500 tons or less, spaced 15 miles apart, south of the Siuslaw River in Zone 603.

Zone 616 east of R9W
Units should be 500 tons or less, spaced 15 miles apart, and 15 miles from downwind SSRAs.  Higher tonnage is possible south of T29S.  Call the forecaster.

Zone 618, 619, and 620
Units should be 1000 tons or less, spaced 15 miles apart, and 15 miles from downwind SSRAs.  No burning allowed south of T35S in Zone 620.

Cascades

All zones except zone 611
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 750 tons or less, spaced 10 miles apart.
        Avoid ignitions before 11 a.m. in Zone 605, 606, and 616.

Zone 611
Units should be 750 tons or less, spaced 10 miles apart, and 12 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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