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

Fri Oct 30 14:23:59 PDT 2009

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

ISSUED: Friday, October 30, 2009       2:30 PM      Nick Yonker

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

Upper level ridge will move off to the east today giving way to a cold front that will move through the region overnight and Saturday morning.  The front will provide a brief burst of rain to most areas, but overall, moisture amounts will be fairly light.  Cooler air follows the front but since the trough is not too deep, snow levels will not get as low as earlier in the week.  Air mass destabilizes tomorrow after the trough passes, providing decent smoke dispersion.

    OUTLOOK (SUNDAY - TUESDAY)

Upper level ridge rebuilds rather quickly on Sunday with the air mass stabilizing.  Upper ridge will remain over the state for the remainder of the period with a front attempting to make it onshore later Monday but falling apart as it does.  Air mass will remain stable and smoke dispersion poor Monday and Tuesday.

2.  DISPERSION

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

MORNING
Mixing height below 3000 ft early rising to 3800 - 4800 ft by late morning.
Transport wind WSW to WNW at 10 - 18 mph.
Surface wind WSW to NW at 6 - 12 mph.

AFTERNOON
Mixing height above 5000 ft.
Transport wind W to NW at 10 - 16 mph.
Surface wind W to NW at 6 - 12 mph.

EVENING
Mixing height remains above 5000 ft.
Transport wind similar to afternoon.
Surface wind W to NW at 4 - 8 mph.

Zone 605-611 (North Cascades):

MORNING
Mixing height below 3000 ft early rising to 3000 - 4000 ft by late morning.
Transport wind SSW to WSW at 10 - 18 mph.
Surface wind SW to WSW at 8 - 14 mph.

AFTERNOON
Mixing height rising above 5000 ft.
Transport wind shifts to W to NW at 10 - 16 mph.
Surface wind shifts to WSW to NW at 6 - 12 mph.

EVENING
Mixing height remains above 5000 ft.
Transport wind WSW to NW at 6 - 12 mph.
Surface wind becomes light and variable but favors SW to NW.

Zone 615-620 (South Coast Range):

MORNING
Mixing height below 2000 ft early rising to 3000 - 4000 ft by late morning.
Transport wind SW to W at 6 - 10 mph.
Surface wind SW to W at 5 - 9 mph.

AFTERNOON
Mixing height rising above 5000 ft.
Transport wind W to NW at 6 - 12 mph.
Surface wind shifts to W to NW at 6 - 10 mph.

EVENING
Mixing height remains above 5000 ft.
Transport wind WNW to NNW at 6 - 10 mph.
Surface wind becomes light and variable but favors W to NW.

Zone 616-623 (South Cascades):

MORNING
Mixing height below 2000 ft early rising to 2200 - 3200 ft by late morning.
Transport wind SSW to WSW at 4 - 8 mph.
Surface wind SSW to WSW at 4 - 8 mph.

AFTERNOON
Mixing height rising above 5000 ft.
Transport wind shifts to WSW to WNW at 6 - 10 mph.
Surface wind shifts to WSW to NW at 6 - 10 mph.

EVENING
Mixing height remains above 5000 ft.
Transport wind W to NW at 5 - 9 mph.
Surface wind W to NW at 4 - 8 mph.

OUTLOOK:

SUNDAY
Mixing height below 1000 ft early rising to 1800 to 2800 ft by late morning rising to 2500 to 3500 ft during the afternoon.  Transport wind NNW to NNE at 4 - 8 mph during the morning becoming N to ENE at 6 - 12 mph during the afternoon.  Surface wind light and variable during the morning becoming NNE to ENE at 6 - 10 mph during the afternoon.

MONDAY
Mixing height below 1000 ft early rising to 1000 to 1700 ft by late morning and through the afternoon.  Transport wind light and variable during the morning becoming WSW to WNW at 6 - 12 mph during the afternoon.  Surface wind light and variable during the morning becoming WSW to WNW at 4 - 8 mph during the afternoon.

TUESDAY
Mixing height below 1000 ft during the morning rising to 1000 to 2000 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.

3.  BURNING INSTRUCTIONS FOR ALL ZONES IN THE WESTERN OREGON AREA
These instructions are valid for burning conducted on Saturday, October 31, 2009.
=================================================================

Coast Range

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

Cascades

Zone 605, 606, 607, 608, 609, 616, 617, 622, and 623
Use standard guidance matrix. (See section 5 below.)  Ensure adequate distance from downwind SSRAs for smoke to dissipate.

Zone 610, 611, and 620
Units should be 1000 tons or less, spaced 5 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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