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

Sat Nov 7 14:30:34 PST 2009

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

ISSUED: Saturday, November 7, 2009       2:30 PM      Nick Yonker

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

Strong WSW'erly jet stream will remain over the region through tomorrow with ridge not building in as much as earlier expected.  Thus, the northern part of the state will remain cloudy and showery with unstable conditions.  The south half of the state will remain mostly dry with some minor stabilization.  SW'erly flow will be strong enough to maintain mostly good smoke dispersion.

    OUTLOOK (MONDAY - WEDNESDAY)

Next cold front approaches the state Monday with rain beginning along the coast during the later morning and spreading inland through the afternoon.  Air mass will stabilize some ahead of the front but cooler air moving in with and behind the front will lift mixing levels Monday afternoon and evening.  Tuesday will have a break in the weather then the next front moves in Tuesday night to Wednesday morning.  Overall, expect mostly good to excellent mixing and smoke dispersion through the period.

2.  DISPERSION

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

MORNING
Mixing height above 5000 ft.
Transport wind SSW to SW at 15 - 25 mph.
Surface wind S to SW at 9 - 15 mph.

AFTERNOON
Mixing height above 5000 ft.
Transport wind SSW to WSW at 12 - 24 mph.
Surface wind SSW to SW at 8 - 12 mph.

EVENING
Mixing height 3300 - 4300 ft.
Transport wind S to SW at 12 - 24 mph.
Surface wind SSE to SSW at 6 - 12 mph.

Zone 615-620 (South Coast Range):

MORNING
Mixing height below 2000 ft early rising to 2500 - 3500 ft by late morning.
Transport wind S to SW at 10 - 18 mph.
Surface wind S to SW at 8 - 12 mph.

AFTERNOON
Mixing height 3300 - 4300 ft.
Transport wind SSW to WSW at 10 - 20 mph.
Surface wind similar to morning.

EVENING
Mixing height 1500 - 2500 ft.
Transport wind shifts to SSE to SSW at 10 - 18 mph.
Surface wind SSE to SSW at 6 - 10 mph.

Zone 616-623 (South Cascades):

MORNING
Mixing height below 2000 ft early rising to 2500 - 3500 ft by late morning.
Transport wind S to SW at 6 - 12 mph.
Surface wind S to SW at 5 - 9 mph.

AFTERNOON
Mixing height 3500 - 4500 ft.
Transport wind S to SW at 5 - 9 mph.
Surface wind becomes light and variable but favors SSE to SSW.

EVENING
Mixing height 1500 - 2500 ft.
Transport wind shifts to SE to S at 6 - 12 mph.
Surface wind similar to afternoon.

OUTLOOK:

MONDAY
In the north mixing height below 1000 ft early, rising to 3500 to 4500 ft by late morning rising above 5000 ft during the afternoon.  In the south mixing height below 1000 ft early rising to 1700 to 2700 ft by late morning rising to 4000 to 5000 ft during the afternoon.  Transport wind SSE to SSW at 12 - 24 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 S to SSW at 10 - 22 mph during the afternoon.

TUESDAY
Mixing height above 5000 ft throughout the day.  Transport wind S to SW at 10 - 16 mph.  Surface wind SE to SSW at 6 - 12 mph.

WEDNESDAY
Mixing height above 5000 ft throughout the day.  Transport wind SSW to SW at 20 - 35 mph.  Surface wind S to SSW at 10 - 22 mph.

3.  BURNING INSTRUCTIONS FOR ALL ZONES IN THE WESTERN OREGON AREA
These instructions are valid for burning conducted on Sunday, November 8, 2009.
=================================================================

Coast Range

Zone 601, 602, 603, 612, and 618
Use standard guidance matrix. (See section 5 below.)  Avoid burning directly upwind of coastal SSRAs.

Zone 615 and 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 in Zone 616.  Call the forecaster.

Zone 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.  Call the forecaster.

Zone 619 and 620
Units should be 1500 tons or less, spaced 10 miles apart, and 12 miles from downwind SSRAs.  South of T35S in Zone 620 units should be 500 tons or less, spaced 10 miles apart, and 12 miles from downwind SSRAs.

Cascades

All zones except zone 611
Use standard guidance matrix. (See section 5 below.)  Ensure adequate distance from downwind SSRAs for smoke to dissipate.  Avoid ignitions north of T24S in Zone 616.

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

Siskiyous
Units should be 1000 tons or less, spaced 8 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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