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

Sat Apr 24 14:24:15 PDT 2010

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

ISSUED: Saturday, April 24, 2010       2:30 PM      Nick Yonker

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

Upper level trough will move by to the east tonight and give way to a ridge on Sunday.  Surface high pressure will build in as well and calm the winds overnight.  Air mass stabilizes as warming air moves in aloft.  Expect mostly sunny skies and warm temperatures during the afternoon after a chilly morning.  With weak wind flow and a stabilizing air mass, smoke dispersion will be mostly poor to fair.

    OUTLOOK (MONDAY - WEDNESDAY)

Upper level ridge slips by to the east early Monday as the next frontal system and major upper level trough move into the state.  Cold front will bring rain into the state beginning Monday morning and spread inland through the afternoon.  Wind flow will increase markedly from the south, bringing greatly improved smoke dispersion.  Front will move through Monday evening as a cold, upper level trough settles over the state Tuesday and Wednesday.  Expect plenty of showers and possible thundershowers under the chilly air mass.  Air mass destabilizes Monday and remains unstable through the remainder of the period, providing good to excellent smoke dispersion.

2.  DISPERSION

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

MORNING
Mixing height below 1000 ft early rising to 1700 - 2700 ft by late morning.
Transport wind ENE to ESE at 4 - 8 mph.
Surface wind light and variable but favors NE to SE and controlled by local terrain.

AFTERNOON
Mixing height rising to 3000 - 4000 ft.
Transport wind becomes light and variable but favors E to S.
Surface wind similar to morning.

EVENING
Mixing height lowers below 1000 ft.
Transport wind increases to SSE to SSW at 5 - 9 mph.
Surface wind similar to afternoon.

Zone 605-611 (North Cascades):

MORNING
Mixing height below 1000 ft early rising to 2500 - 3500 ft by late morning.
Transport wind light and variable.
Surface wind light and variable but favors NNE to E and controlled by local terrain.

AFTERNOON
Mixing height 3500 - 4500 ft.
Transport wind similar to morning.
Surface wind similar to morning.

EVENING
Mixing height lowers below 1000 ft.
Transport wind increases to SSE to SSW at 4 - 8 mph.
Surface wind similar to afternoon.

Zone 615-620 (South Coast Range):

MORNING
Mixing height below 1000 ft early rising to 2200 - 3200 ft by late morning.
Transport wind light and variable.
Surface wind light and variable but favors E to S and controlled by local terrain.

AFTERNOON
Mixing height 3000 - 4000 ft.
Transport wind shifts to SSE to SW at 6 - 10 mph.
Surface wind increases to WSW to WNW at 5 - 9 mph.

EVENING
Mixing height lowers below 1000 ft.
Transport wind similar to afternoon.
Surface wind becomes light and variable but favors E to S and controlled by local terrain.

Zone 616-623 (South Cascades):

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

AFTERNOON
Mixing height rising above 5000 ft.
Transport wind increases to SW to W at 4 - 8 mph.
Surface wind increases to WSW to NW at 4 - 8 mph.

EVENING
Mixing height lowers below 1000 ft.
Transport wind becomes light and variable but favors SE to SW.
Surface wind becomes light and variable and controlled by local terrain.

OUTLOOK:

MONDAY
Mixing height below 1000 ft early rising to 2500 to 3500 ft by late morning rising above 5000 ft during the afternoon.  Transport wind S to SSW at 10 - 22 mph during the morning becoming S to SSW at 20 - 35 mph during the afternoon.  Surface wind SE to SSW at 6 - 12 mph during the morning becoming SSE to SSW at 12 - 22 mph during the afternoon.

TUESDAY
Mixing height 3500 to 4500 ft during the morning rising above 5000 ft during the afternoon.  Transport wind SW to W at 13 - 25 mph.  Surface wind WSW to WNW at 10 - 20 mph.

WEDNESDAY
Mixing height above 5000 ft throughout the day.  Transport wind WSW to WNW at 13 - 25 mph.  Surface wind W to NW at 8 - 12 mph.

3.  BURNING INSTRUCTIONS FOR ALL ZONES IN THE WESTERN OREGON AREA
These instructions are valid for burning conducted on Sunday, April 25, 2010.
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Coast Range

Zone 601, 612, and 616 east of R9W
Units should be 750 tons or less, spaced 10 miles apart, and 12 miles from downwind SSRAs.  Higher tonnage is possible south of T29S in Zone 616.  Call the forecaster.

Zone 602 and 603
Units should be 300 tons or less, spaced 10 miles apart, and 12 miles from downwind SSRAs.

Zone 615 and 620
Units should be 1500 tons or less, spaced 10 miles apart, and 12 miles from downwind SSRAs.

Zone 616 west of R8W
Units should be 1200 tons or less, spaced 10 miles apart, and 12 miles from downwind SSRAs.  Higher tonnage is possible south of T29S.  Call the forecaster.

Zone 618 and 619
Use standard guidance matrix. (See section 5 below.)

Cascades

Zone 605 and 606
Units should be 300 tons or less, spaced 8 miles apart, and 10 miles from downwind SSRAs.

Zone 607, 608, 616, 620, and 622
Units should be 1000 tons or less, spaced 8 miles apart, and 10 miles from downwind SSRAs.

Zone 609, 617, and 623
Use standard guidance matrix. (See section 5 below.)  Ensure adequate distance from downwind SSRAs for smoke to dissipate.

Zone 610 and 611
Units should be 1500 tons or less, spaced 8 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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