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

Wed Sep 15 14:49:19 PDT 2010

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS

SALEM FORESTRY WEATHER CENTER

OREGON DEPARTMENT OF FORESTRY

ISSUED: Wednesday, September 15, 2010       2:30 PM      Pete Parsons

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

    THURSDAY

A weakening cold front will give way to a transitory upper-level ridge of high pressure with a warm southwesterly flow aloft.  Areas of morning rain, mainly north, will taper off in the afternoon.  Skies should stay mostly cloudy, but temperatures will remain near normal.

     OUTLOOK (FRIDAY-SUNDAY)

Southwesterly flow aloft will increase Friday with another cold front forecast to move onshore in the afternoon. Widespread rain is expected across western Oregon Friday night and Saturday with an upper-level trough maintaining mostly cloudy skies and some showers on Sunday.  Temperatures will cool to below normal over the weekend.

2.  DISPERSION

Zone 601, 602, 603, 612 and 615-620 (North and South Coast Range):

MORNING

Mixing height below 500 ft early rising to 1500 - 2500 ft by late morning.

Transport wind SE to SSW at 5 - 9 mph.

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

AFTERNOON

Mixing height rising to 2700 - 3700 ft.

Transport wind shifts to SSW to WSW at 8 - 12 mph.

Surface wind increases to SW to W at 4 - 8 mph.

EVENING

Mixing height lowers below 1000 ft.

Transport wind becomes light and variable but favors SE to SW and controlled by local terrain.

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

Zone 605-611 (North Cascades):

MORNING

Mixing height below 500 ft early rising to 2000 - 3000 ft by late morning.

Transport wind SSE to SSW at 4 - 8 mph.

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

AFTERNOON

Mixing height rising to 3700 - 4700 ft.

Transport wind shifts to SW to W at 4 - 8 mph.

Surface wind increases to WSW to WNW at 4 - 8 mph.

EVENING

Mixing height lowers below 1000 ft.

Transport wind becomes light and variable but favors S and controlled by local terrain.

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

Zone 616-623 (South Cascades):

MORNING

Mixing height below 500 ft early rising to 2500 - 3500 ft by late morning.

Transport wind SSE to SSW at 4 - 8 mph.

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

AFTERNOON

Mixing height rising above 5000 ft.

Transport wind shifts to SW to W at 4 - 8 mph.

Surface wind increases to WSW to WNW at 4 - 8 mph.

EVENING

Mixing height lowers below 1000 ft.

Transport wind becomes light and variable but favors S and controlled by local terrain.

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

OUTLOOK:

FRIDAY

In the north mixing height below 1000 ft early rising to 1900 to 2900 ft by late morning rising to 3000 to 4000 ft during the afternoon.  In the south mixing height below 1000 ft early rising to 2700 to 3700 ft by late morning and through the afternoon.  Transport wind light and variable during the morning becoming SSW to WSW at 8 - 14 mph during the afternoon.  Surface wind light and variable during the morning becoming SW to W at 5 - 9 mph during the afternoon.

SATURDAY

Mixing height below 1000 ft early rising to 1900 to 2900 ft by late morning rising to 2900 to 3900 ft during the afternoon.  Transport wind SE to SSW at 4 - 8 mph during the morning becoming S to SW at 6 - 10 mph during the afternoon.  Surface wind light and variable.

SUNDAY

Mixing height below 1000 ft early rising to 2000 to 3000 ft by late morning rising to 4000 to 5000 ft during the afternoon.  Transport wind SSE to SSW at 4 - 8 mph during the morning becoming S to SW at 4 - 8 mph during the afternoon.  Surface wind light and variable.

3.  BURNING INSTRUCTIONS FOR ALL ZONES IN THE WESTERN OREGON AREA

These instructions are valid for burning conducted on Thursday, September 16, 2010.

=================================================================

Coast Range

Zone 601 and 612

Units should be 1000 tons or less, spaced 10 miles apart, and 12 miles from downwind SSRAs.  North of Tillamook in Zone 601, use standard guidance matrix. (See section 5 below.)

Zone 602 and 603

Units should be 500 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.)  Units may be 750 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 1500 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 618, 619, and 620

Use standard guidance matrix. (See section 5 below.)  Ensure adequate distance from downwind SSRAs for smoke to dissipate.

Cascades

All zones except zone 611

Use standard guidance matrix. (See section 5 below.)  Ensure adequate distance from downwind SSRAs for smoke to dissipate.

Zone 611

Units should be 1000 tons or less, spaced 8 miles apart, and 10 miles from downwind SSRAs.

Siskiyous

Use standard guidance matrix. (See section 5 below.)  Ensure adequate distance from downwind SSRAs for smoke to dissipate.

==============================================================

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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