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

Fri May 1 14:30:52 PDT 2009

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

ISSUED: Friday, May 1, 2009       2:30 PM      Nick Yonker

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

Upper level ridge is passing by to the east this afternoon as increasing clouds from a frontal system and trough moving up from the southwest pushes in this evening.  Scattered showers have already started in SW Oregon, but rain will increase this evening and spread northward.  Expect continued showers tomorrow.  Air mass will be somewhat stable during the night and early morning but cooler air moving in aloft, plus increasing southerly flow, will make for good mixing and dispersion on Saturday.

    OUTLOOK (SUNDAY - TUESDAY)

Upper trough continues to move in Sunday with more moisture increasing during the late night to early morning hours Saturday/Sunday.  Rain will continue on and off into Sunday before drying out some later in the day.  Another front will move in later Monday bringing more rain and wind.  Expect continued cool, breezy, and showery conditions into Tuesday.  Air mass will be mostly unstable through the period, and with brisk SW'erly flow, smoke dispersion will remain mostly excellent.

2.  DISPERSION

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

MORNING
Mixing height below 3000 ft early rising above 5000 ft by late morning.
Transport wind S to SSW at 16 - 30 mph.
Surface wind SE to S at 10 - 18 mph.

AFTERNOON
Mixing height above 5000 ft.
Transport wind SSW to SW at 16 - 30 mph.
Surface wind shifts to SSW to SW at 10 - 16 mph.

EVENING
Mixing height remains above 5000 ft.
Transport wind SSW to SW at 12 - 24 mph.
Surface wind S to SW at 6 - 10 mph.

Zone 615-620 (South Coast Range):

MORNING
Mixing height below 3000 ft early rising above 5000 ft by late morning.
Transport wind SSW to SW at 14 - 28 mph.
Surface wind SSE to SSW at 10 - 16 mph.

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

EVENING
Mixing height remains above 5000 ft.
Transport wind S to SW at 10 - 16 mph.
Surface wind SE to SSW at 4 - 8 mph.

Zone 616-623 (South Cascades):

MORNING
Mixing height below 3000 ft early rising above 5000 ft by late morning.
Transport wind S to SW at 9 - 15 mph.
Surface wind SSE to SSW at 4 - 8 mph.

AFTERNOON
Mixing height above 5000 ft.
Transport wind similar to morning.
Surface wind S to SW at 6 - 10 mph.

EVENING
Mixing height 3000 - 4000 ft.
Transport wind SSW to SW at 8 - 12 mph.
Surface wind becomes light and variable but favors S to SW and controlled by local terrain.

OUTLOOK:

SUNDAY
Mixing height 3300 to 4300 ft during the morning rising above 5000 ft during the afternoon.  Transport wind SSW to SW at 9 - 15 mph during the morning becoming SW to WSW at 14 - 28 mph during the afternoon.  Surface wind S to SW at 6 - 10 mph during the morning becoming SW to WSW at 9 - 15 mph during the afternoon.

MONDAY
Mixing height 3200 to 4200 ft during the morning rising above 5000 ft during the afternoon.  Transport wind SSW to SW at 9 - 15 mph during the morning becoming S to SSW at 22 - 40 mph during the afternoon.  Surface wind SSE to SSW at 10 - 16 mph.

TUESDAY
Mixing height above 5000 ft throughout the day.  Transport wind SSW to SW at 22 - 40 mph.  Surface wind SSE to SSW at 10 - 18 mph.

3.  BURNING INSTRUCTIONS FOR ALL ZONES IN THE WESTERN OREGON AREA
These instructions are valid for burning conducted on Saturday, May 2, 2009.
=================================================================

Coast Range

Zone 601, 612, and 616 west of R8W
Units should be 1500 tons or less, spaced 5 miles apart, and 10 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
Units should be 750 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.  North of T3N in Zone 602, use standard guidance matrix. (See section 5 below.)

Zone 615, 618, 619, and 620
Use standard guidance matrix. (See section 5 below.)  Avoid burning directly upwind of the North Bend/Coos Bay SSRA.  South of T35S in Zone 620 units should be 500 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.

Zone 616 east of R9W
Units should be 1000 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.  Higher tonnage is possible south of T29S.  Call the forecaster.

Cascades

All zones except zone 611
Use standard guidance matrix. (See section 5 below.)  Ensure adequate distance from downwind SSRAs for smoke to dissipate.  Verify transport winds away from SSRA if burning within 10 miles of the SSRA in Zone 605 and 606.  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 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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