SMI South Central (Smoke Management Instructions) South Central Oregon Smoke Management Instructions

Tue Apr 27 15:51:45 PDT 2010

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

ISSUED: Tuesday, April 27, 2010       2:30 PM      Jim Little

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

    WEDNESDAY

A cold upper-level trough will move over Oregon with west-southwesterly flow aloft.  Snow levels will drop to around 3000 feet with frequent showers.  Surface temperatures will be well below normal.  The air mass will be quite unstable, and maximum mixing heights will go above 5000 feet for good smoke dispersal conditions.

    OUTLOOK (THURSDAY-SATURDAY)

The strong upper-level trough will slowly progress eastward with the flow aloft becoming northwesterly.  The air mass will remain unstable enough for daytime heating to trigger mainly afternoon and evening showers Thursday and Friday.  There may be enough warming aloft to shut down the shower activity on Saturday.  Snow levels will start out near 3500 feet on Thursday...rising to between 4000 and 5000 feet Friday and above 5000 feet on Saturday.  Maximum mixing heights should reach 5000 feet plus throughout the outlook period for good smoke dispersal conditions.

2.  DISPERSION

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

MORNING
Mixing height 2000 - 3000 ft.
Transport wind SW to W at 9 - 15 mph.
Surface wind SW to W at 6 - 10 mph.

AFTERNOON
Mixing height rising above 5000 ft.
Transport wind increases to WSW to W at 12 - 24 mph.
Surface wind WSW to WNW at 10 - 16 mph.

EVENING
Mixing height 2100 - 3100 ft.
Transport wind WSW to WNW at 10 - 18 mph.
Surface wind SW to WNW at 6 - 12 mph.

Zone 605-611 (North Cascades):

MORNING
Mixing height 2200 - 3200 ft.
Transport wind SSW to SW at 12 - 24 mph.
Surface wind SSW to SW at 8 - 14 mph.

AFTERNOON
Mixing height rising above 5000 ft.
Transport wind SW to W at 10 - 20 mph.
Surface wind SW to W at 8 - 14 mph.

EVENING
Mixing height 2300 - 3300 ft.
Transport wind SW to W at 8 - 14 mph.
Surface wind similar to afternoon.

Zone 615-620 (South Coast Range):

MORNING
Mixing height 1800 - 2800 ft.
Transport wind WSW to WNW at 9 - 15 mph.
Surface wind WSW to WNW at 8 - 12 mph.

AFTERNOON
Mixing height rising above 5000 ft.
Transport wind similar to morning.
Surface wind WSW to WNW at 8 - 12 mph.

EVENING
Mixing height 2800 - 3800 ft.
Transport wind similar to afternoon.
Surface wind WSW to WNW at 5 - 9 mph.

Zone 616-623 (South Cascades):

MORNING
Mixing height 1400 - 2400 ft.
Transport wind SW to WSW at 9 - 15 mph.
Surface wind SSW to W at 4 - 8 mph.

AFTERNOON
Mixing height rising above 5000 ft.
Transport wind WSW to WNW at 9 - 15 mph.
Surface wind WSW to WNW at 6 - 10 mph.

EVENING
Mixing height 1700 - 2700 ft.
Transport wind similar to afternoon.
Surface wind similar to afternoon.

OUTLOOK:

THURSDAY
Mixing height 2500 to 3500 ft during the morning rising above 5000 ft during the afternoon.  Transport wind WSW to WNW at 9 - 15 mph.  Surface wind WSW to WNW at 6 - 12 mph during the morning becoming W to NW at 10 - 18 mph during the afternoon.

FRIDAY
Mixing height 2000 to 3000 ft during the morning rising above 5000 ft during the afternoon.  Transport wind WSW to WNW at 8 - 14 mph during the morning becoming WNW to NNW at 10 - 18 mph during the afternoon.  Surface wind WSW to WNW at 4 - 8 mph.

SATURDAY
Mixing height below 1000 ft early rising to 2400 to 3400 ft by late morning rising to 4100 to 5000 ft during the afternoon.  Transport wind NW to NNW at 10 - 18 mph.  Surface wind NW to N at 6 - 10 mph.

3.  BURNING INSTRUCTIONS FOR ALL ZONES IN THE WESTERN OREGON AREA
These instructions are valid for burning conducted on Wednesday, April 28, 2010.
=================================================================

Coast Range

Zone 601 and 612
Units should be 1000 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.  Restrict units in or near corridors to 500 tons or less.  North of Tillamook in Zone 601, use standard guidance matrix. (See section 5 below.)

Zone 602, 603, and 620
Units should be 500 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.)  Avoid burning in or near corridors.  Units may be 750 tons or less, spaced 5 miles apart, south of the Siuslaw River in Zone 603.  Higher tonnage is possible south of T35S in Zone 620.  Call the forecaster.

Zone 615
Units should be 1500 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.

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 616 east of R9W
Units should be 750 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 610 and 611
Use standard guidance matrix. (See section 5 below.)  Ensure adequate distance from downwind SSRAs for smoke to dissipate.  From T15S through T20S in Zone 608 units should be 1000 tons or less, spaced 5 miles apart.

Zone 610 and 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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