SMI West (Smoke Management Instructions) (no subject)

Tue Sep 28 14:13:50 PDT 2010

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS

SALEM FORESTRY WEATHER CENTER

OREGON DEPARTMENT OF FORESTRY

ISSUED: Tuesday, September 28, 2010       2:30 PM      Jim Little

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

WEDNESDAY
In the upper atmosphere a ridge covers the Pacific Northwest for Wednesday.  The ridge is centered to the south with a generally west to east flow aloft over the region.  Warm air aloft with this ridge will produce very stable conditions and mixing heights will be quite low.  South Coast Range zones and the north Cascades will have only marginal smoke dispersal conditions.  Winds will be generally NNE to E across the area.
    EXTENDED OUTLOOK (THURSDAY - SATURDAY)
An upper level disturbance moves SW to NE offshore toward southwestern British Columbia on Thursday.  A surface thermal trough will extend from central California into SW Oregon.  Low mixing heights will continue and winds will be generally NE for northern zones and SE for southern zones.  On Friday the upper ridge retreats slightly eastward and the thermal trough shifts eastward as well.  This should allow onshore flow in low levels.  Mixing heights remain suppressed.  Winds will be generally southwesterly except light and variable in the south.  The upper ridge flattens Saturday but mixing heights remain suppressed with potentially poor smoke dispersal conditions for the north Coast Range and marginal conditions in the north Cascades.  The south Coast Range and the southern Cascades will see some improvement.

2.  DISPERSION

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

MORNING

Mixing height 1000 - 2000 ft.

Transport wind NNE to ENE at 4 - 8 mph.

Surface wind NNE to ENE at 4 - 8 mph.

AFTERNOON

Mixing height rising to 2500 - 3500 ft.

Transport wind NNW to NE at 6 - 12 mph.

Surface wind NNW to NE at 6 - 10 mph.

EVENING

Mixing height 1400 - 2400 ft.

Transport wind N to NE at 10 - 18 mph.

Surface wind NNW to NNE at 4 - 8 mph.

Zone 605-611 (North Cascades):

MORNING

Mixing height 1500 - 2500 ft.

Transport wind light and variable.

Surface wind light and variable and controlled by local terrain.

AFTERNOON

Mixing height 2400 - 3400 ft.

Transport wind increases to NNW to NE at 6 - 12 mph.

Surface wind increases to NNW to NE at 6 - 12 mph.

EVENING

Mixing height 1000 - 1600 ft.

Transport wind NNE to ENE at 6 - 12 mph.

Surface wind NNE to ENE at 4 - 8 mph.

Zone 615-620 (South Coast Range):

MORNING

Mixing height 1200 - 2200 ft.

Transport wind NE to E at 5 - 9 mph.

Surface wind NE to E at 5 - 9 mph.

AFTERNOON

Mixing height 1800 - 2800 ft.

Transport wind shifts to NNW to NNE at 8 - 14 mph.

Surface wind shifts to NNW to NNE at 8 - 12 mph.

EVENING

Mixing height lowers below 1000 ft.

Transport wind NNW to NNE at 4 - 8 mph.

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

Zone 616-623 (South Cascades):

MORNING

Mixing height 1800 - 2800 ft.

Transport wind light and variable.

Surface wind light and variable and controlled by local terrain.

AFTERNOON

Mixing height rising to 3200 - 4200 ft.

Transport wind increases to NW to N at 8 - 12 mph.

Surface wind increases to NW to N at 6 - 12 mph.

EVENING

Mixing height lowers below 1000 ft.

Transport wind shifts to N to NE at 5 - 9 mph.

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

OUTLOOK:

THURSDAY

Mixing height below 1000 ft early rising to 1600 to 2600 ft by late morning rising to 2400 to 3400 ft during the afternoon.  In the Coast Range transport wind NE to ENE at 8 - 12 mph during the morning becoming NNW to NE at 6 - 12 mph during the afternoon.  In the Cascades transport wind light and variable during the morning becoming NW to N at 4 - 8 mph during the afternoon.  Surface wind light and variable during the morning becoming NW to NNE at 5 - 9 mph during the afternoon.

FRIDAY

Mixing height below 1000 ft early rising to 1100 to 2100 ft by late morning rising to 2400 to 3400 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable during the morning becoming SSW to WSW at 4 - 8 mph during the afternoon.

SATURDAY

Mixing height below 1000 ft early rising to 1400 to 2400 ft by late morning rising to 2600 to 3600 ft during the afternoon.  Transport wind N to NE at 4 - 8 mph.  Surface wind light and variable during the morning becoming N to NE at 4 - 8 mph during the afternoon.

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

These instructions are valid for burning conducted on Wednesday, September 29, 2010.

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

Coast Range

Zone 601, 612, 615, 616 west of R8W, 618, and 619

Use standard guidance matrix. (See section 5 below.)  Avoid burning directly upwind of coastal SSRAs.

Zone 602 and 603

Units should be 1000 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 616 east of R9W and 620

Units should be 1000 tons or less, spaced 15 miles apart, and 15 miles from downwind SSRAs.  Higher tonnage is possible south of the Rogue River in Zone 620.  Call the forecaster.

Cascades

Zone 605 and 606

Units should be 500 tons or less, spaced 15 miles apart, and 15 miles from downwind SSRAs.  Verify transport winds away from SSRA if burning within 10 miles of the SSRA.  Higher tonnage is possible south of T20S in Zone 606.  Call the forecaster.

Zone 607 and 608

Units should be 1000 tons or less, spaced 15 miles apart, and 15 miles from downwind SSRAs.

Zone 609, 610, 611, 616, 617, and 623

Use standard guidance matrix. (See section 5 below.)  Ensure adequate distance from downwind SSRAs for smoke to dissipate.  South of T30S in Zone 617 units should be 500 tons or less, spaced 10 miles apart.

Zone 620 and 622

No burning allowed.

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/20100928/aa95c2d5/attachment.html>