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

Tue May 18 14:01:50 PDT 2010

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

ISSUED: Tuesday, May 18, 2010       2:30 PM      Jim Little

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

    WEDNESDAY

A deep surface low pressure area will track north-northeastward off the Oregon Coast on Wednesday bringing strong south winds and significant rain to the region.  Rain spreads from west to east beginning in the morning and reaching the Cascade crest by mid-afternoon.  Winds on the coast will peak in the 40 to 60mph range most areas while interior valleys will see peak winds generally on the order of 40mph.  The snow level will drop to 3000-3500 feet overnight Wednesday night.  Mixing heights will be 5000 feet or better for good smoke dispersal conditions.

    OUTLOOK (THURSDAY-SATURDAY)

An upper level trough swings through early in the day Thursday.  Showers then taper off, ending completely in the south.  Cool air aloft will give good mixing heights and good smoke dispersal conditions.  A system much weaker than Wednesday's will move through Friday for periods of rain and weak upper level troughiness continues for scattered showers into the weekend.  Cooler surface temperatures will limit mixing heights somewhat Friday and Saturday.

2.  DISPERSION

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

MORNING
Mixing height above 5000 ft.
Transport wind SE to S at 12 - 24 mph.
Surface wind SE to S at 9 - 15 mph.

AFTERNOON
Mixing height above 5000 ft.
Transport wind SSW at 24 - 42 mph.
Surface wind shifts to SSW to SW and increases to 14 - 28 mph.

EVENING
Mixing height 4400 - 5000 ft.
Transport wind SW at 31 - 51 mph.
Surface wind SW at 20 - 34 mph.

Zone 605-611 (North Cascades):

MORNING
Mixing height above 5000 ft.
Transport wind SSE to SSW at 10 - 18 mph.
Surface wind SSE to SSW at 10 - 18 mph.

AFTERNOON
Mixing height above 5000 ft.
Transport wind shifts to SW to WSW at 13 - 25 mph.
Surface wind shifts to SW to WSW at 13 - 25 mph.

EVENING
Mixing height remains above 5000 ft.
Transport wind SSW at 20 - 36 mph.
Surface wind SSW at 20 - 34 mph.

Zone 615-620 (South Coast Range):

MORNING
Mixing height above 5000 ft.
Transport wind SSW at 22 - 38 mph.
Surface wind SSW to SW at 18 - 30 mph.

AFTERNOON
Mixing height above 5000 ft.
Transport wind SW at 22 - 40 mph.
Surface wind SW at 19 - 33 mph.

EVENING
Mixing height 3700 - 4700 ft.
Transport wind SW at 18 - 32 mph.
Surface wind decreases to SW to WSW at 15 - 25 mph.

Zone 616-623 (South Cascades):

MORNING
Mixing height above 5000 ft.
Transport wind SSE to SSW at 14 - 28 mph.
Surface wind SSE to SSW at 13 - 25 mph.

AFTERNOON
Mixing height above 5000 ft.
Transport wind shifts to SW to WSW at 12 - 24 mph.
Surface wind shifts to SW to WSW at 12 - 24 mph.

EVENING
Mixing height remains above 5000 ft.
Transport wind SSW to WSW at 10 - 20 mph.
Surface wind SSW to WSW at 10 - 20 mph.

OUTLOOK:

THURSDAY
Mixing height 2700 to 3700 ft during the morning rising above 5000 ft during the afternoon.  Transport wind SSW to WSW at 10 - 18 mph.  Surface wind SSW to WSW at 9 - 15 mph.

FRIDAY
Mixing height 1600 to 2600 ft during the morning rising to 3400 to 4400 ft during the afternoon.  Transport wind WSW to WNW at 8 - 12 mph.  Surface wind light and variable.

SATURDAY
Mixing height 1300 to 2300 ft during the morning rising to 2900 to 3900 ft during the afternoon.  Transport wind WSW to WNW at 6 - 10 mph.  Surface wind light and variable.

3.  BURNING INSTRUCTIONS FOR ALL ZONES IN THE WESTERN OREGON AREA
These instructions are valid for burning conducted on Wednesday, May 19, 2010.
=================================================================

Coast Range

Zone 601, 612, 615, and 620
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.)  South of T35S in Zone 620 units should be 500 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.

Zone 602, 603, and 616 east of R9W
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.)  Higher tonnage is possible south of T29S in Zone 616.  Call the forecaster.

Zone 616 west of R8W
Units should be 1200 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.  Higher tonnage is possible south of T29S.  Call the forecaster.

Zone 618
Use standard guidance matrix. (See section 5 below.)

Zone 619
Units should be 2000 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.

Cascades

All zones except zone 611
Use standard guidance matrix. (See section 5 below.)  Ensure adequate distance from downwind SSRAs for smoke to dissipate.  From T18S through T22S in Zone 608 units should be 1000 tons or less, spaced 5 miles apart.

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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