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

Thu Apr 22 14:36:21 PDT 2010

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

ISSUED: Thursday, April 22, 2010       2:30 PM      Nick Yonker

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

Flat upper level ridge builds over the state tonight and Friday bringing dry and fairly stable conditions tomorrow.  Ridge will shift eastward Friday afternoon, giving way to a disturbance moving in Friday night.  Expect increasing clouds through the day with a chance of some light moisture Friday evening, mainly over the north half of the state.  Smoke dispersion will be poor during the morning becoming fair during the afternoon as the disturbance increases the winds from the SW.

    OUTLOOK (SATURDAY - MONDAY)

Upper level trough follows Friday night's front bringing considerably cooler and unstable conditions Saturday.  Upper level ridge builds back into the state Saturday night and Sunday, stabilizing the air mass again.  Ridge moves off to the east Monday as the next trough and front approach.  Moisture from this next front will move in Monday night.  Expect good smoke dispersion Saturday, poor to fair dispersion Sunday, and then improving dispersion Monday.

2.  DISPERSION

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

MORNING
Mixing height below 1000 ft early rising to 2300 - 3300 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 2500 - 3500 ft.
Transport wind increases to SW to W at 10 - 20 mph.
Surface wind increases to WSW to WNW at 9 - 15 mph.

EVENING
Mixing height 2300 - 3300 ft.
Transport wind increases to WSW to W at 18 - 30 mph.
Surface wind WSW to WNW at 10 - 20 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 and controlled by local terrain.
Surface wind light and variable and controlled by local terrain.

AFTERNOON
Mixing height rising to 3500 - 4500 ft.
Transport wind increases to SW to W at 10 - 16 mph.
Surface wind increases to SW to WNW at 6 - 12 mph.

EVENING
Mixing height 2500 - 3500 ft.
Transport wind increases to WSW to W at 15 - 25 mph.
Surface wind WSW to WNW at 9 - 15 mph.

Zone 615-620 (South Coast Range):

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

AFTERNOON
Mixing height 3000 - 4000 ft.
Transport wind increases to SW to W at 10 - 16 mph.
Surface wind increases to WSW to WNW at 8 - 14 mph.

EVENING
Mixing height 1700 - 2700 ft.
Transport wind WSW to W at 12 - 24 mph.
Surface wind similar to afternoon.

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 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 W to NW at 8 - 12 mph.

EVENING
Mixing height lowers below 2000 ft after sunset.
Transport wind similar to afternoon.
Surface wind WSW to WNW at 5 - 9 mph.

OUTLOOK:

SATURDAY
Mixing height 4200 to 5000 ft during the morning rising above 5000 ft during the afternoon.  Transport wind W to NW at 10 - 20 mph.  Surface wind WSW to WNW at 8 - 12 mph.

SUNDAY
Mixing height below 1000 ft early rising to 1500 to 2500 ft by late morning rising to 3500 to 4500 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.

MONDAY
Mixing height below 1000 ft early rising to 1500 to 2500 ft by late morning rising to 3000 to 4000 ft during the afternoon.  Transport wind SSE to S at 12 - 24 mph.  Surface wind SE to S at 8 - 12 mph.

3.  BURNING INSTRUCTIONS FOR ALL ZONES IN THE WESTERN OREGON AREA
These instructions are valid for burning conducted on Friday, April 23, 2010.
=================================================================

Coast Range

Zone 601 and 612
Units should be 750 tons or less, spaced 10 miles apart, and 12 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 300 tons or less, spaced 10 miles apart, and 12 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 500 tons or less, spaced 10 miles apart, south of the Siuslaw River in Zone 603.

Zone 615 and 616 west of R8W
Units should be 1000 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 616 east of R9W
Units should be 500 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
Units should be 2000 tons or less, spaced 10 miles apart, and 12 miles from downwind SSRAs.

Zone 619
Units should be 1500 tons or less, spaced 10 miles apart, and 12 miles from downwind SSRAs.

Zone 620
No burning allowed.  Some burning allowed south of T35S.  Call the forecaster.

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 8 miles apart.

Zone 610 and 611
Units should be 1000 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.

Nick Yonker
Meteorology Manager
Oregon Department of Forestry
503-945-7451

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