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

Fri Oct 15 14:16:40 PDT 2010

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS

SALEM FORESTRY WEATHER CENTER

OREGON DEPARTMENT OF FORESTRY

ISSUED: Friday, October 15, 2010       2:30 PM      Pete Parsons

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

SATURDAY

The upper-level flow is forecast to turn southwesterly, as a splitting weak trough approaches the coastline.  It will spread some clouds across the region but not likely any precipitation.  Transport winds will be mostly northerly across the northern zones but likely turn onshore across the southern zones.  Partly sunny skies will improve mixing enough for fair afternoon smoke dispersal conditions.

OUTLOOK (SUNDAY-TUESDAY)

An upper-level trough is forecast to split apart, as is moves onshore, with the main portion of it dropping southward, across California and Nevada, Sunday through Tuesday.  An upper-level ridge is forecast to build over Oregon for continued dry conditions.  Warming aloft will combine with October's lowering sun angle to strengthen overnight surface-based inversions.  Afternoon smoke dispersal conditions will deteriorate each day, becoming marginal by Monday and poor on Tuesday.

2.  DISPERSION

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

MORNING

Mixing height below 1000 ft early rising to 1500 - 2500 ft by late morning.

Transport wind light and variable but favors NW to N and controlled by local terrain.

Surface wind light and variable but favors NW to N and controlled by local terrain.

AFTERNOON

Mixing height rising to 3300 - 4300 ft.

Transport wind increases to NW to NNE at 5 - 9 mph.

Surface wind increases to NW to N at 4 - 8 mph.

EVENING

Mixing height 1000 - 2000 ft.

Transport wind similar to afternoon.

Surface wind becomes light and variable but favors NW to N and controlled by local terrain.

Zone 615-620 (South Coast Range):

MORNING

Mixing height below 1000 ft early rising to 1500 - 2500 ft by late morning.

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

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

AFTERNOON

Mixing height rising to 3000 - 4000 ft.

Transport wind increases to NW to NNE at 6 - 10 mph.

Surface wind increases to NW to N at 5 - 9 mph.

EVENING

Mixing height 1000 - 2000 ft.

Transport wind NNW to NE at 4 - 8 mph.

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

Zone 616-623 (South Cascades):

MORNING

Mixing height below 1000 ft early rising to 1500 - 2500 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 4000 - 5000 ft.

Transport wind increases to WNW to NNW at 4 - 8 mph.

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

EVENING

Mixing height 1000 - 1800 ft.

Transport wind becomes light and variable and controlled by local terrain.

Surface wind becomes light and variable and controlled by local terrain.

OUTLOOK:

SUNDAY

Mixing height below 1000 ft early rising to 1400 to 2400 ft by late morning rising to 3000 to 4000 ft during the afternoon.  Transport wind light and variable during the morning becoming N to NE at 5 - 9 mph during the afternoon.  Surface wind light and variable during the morning becoming NNW to NNE at 4 - 8 mph during the afternoon.

MONDAY

Mixing height below 1000 ft early rising to 1200 to 2200 ft by late morning rising to 2300 to 3300 ft during the afternoon.  Transport wind light and variable during the morning becoming N to ENE at 4 - 8 mph during the afternoon.  Surface wind light and variable.

TUESDAY

Mixing height below 1000 ft early rising to 1000 to 1800 ft by late morning rising to 1900 to 2900 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 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.  Higher tonnage is possible south of Waldport in Zone 612.  Call the forecaster.

Zone 602 and 603

Units should be 300 tons or less, spaced 10 miles apart, and 12 miles from downwind SSRAs.  Avoid ignitions north of Forest Grove/Hillsboro or Sheridan/Willamina in Zone 602.  Higher tonnage is possible south of T17S in Zone 603.  Call the forecaster.

Zone 615, 618, and 619

Use standard guidance matrix. (See section 5 below.)  Avoid burning directly upwind of the North Bend/Coos Bay SSRA.

Zone 616 west of R8W

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

Zone 616 east of R9W

Units should be 750 tons or less, spaced 10 miles apart, and 12 miles from downwind SSRAs.

Zone 620

Units should be 500 tons or less, spaced 10 miles apart, and 12 miles from downwind SSRAs.  Higher tonnage is possible south of the Rogue River.  Call the forecaster.

Cascades

Zone 605, 606, 607, 608, 609, 611, 616, 617, and 623

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

Zone 610

Units should be 750 tons or less, spaced 10 miles apart, and 12 miles from downwind SSRAs.

Zone 620 and 622

Units should be 500 tons or less, spaced 8 miles apart, and 10 miles from downwind SSRAs.  East of R2W in Zone 622, use standard guidance matrix. (See section 5 below.)

Siskiyous

Use standard guidance matrix. (See section 5 below.)

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

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.

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://omls.oregon.gov/pipermail/smi_west/attachments/20101015/80173f37/attachment.html>