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

[ODF Smoke Management Instructions]

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

ISSUED: Tuesday, July 6, 2010       2:30 PM      Jim Little

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

    WEDNESDAY

Upper air charts show a strong upper ridge offshore again tomorrow with a thermal trough extending from central California into SW Oregon.  Low level flow will continue offshore except for light onshore flow developing at the extreme south coast.  Temperatures in the interior will be from 15 to 20 degrees above average for the time of year...the warmest weather since last summer. Temperatures on the coast will be 10 to 15 degrees above average except temperatures will be near average on the south coast.  Winds will be from the East in the north and from the southeast most southern zones.  Maximum afternoon mixing heights will be well above 5000 feet for generally good smoke dispersal conditions.

    OUTLOOK (THURSDAY-SATURDAY)

The surface thermal trough builds northward then shifts onshore during the day on Thursday. Low level flow will turn onshore most coastal areas except the extreme north.  Temperatures will be near average for the coastal strip except near Astoria where temperatures will again be about 10 degrees above average.  Interior locations will also again be about 15 to 20 degrees above average. With cooler temperatures on the coast but continued warm air aloft, maximum mixing heights will not be as high Thursday.  Elsewhere mixing heights will remain high, but winds will be light and variable in much of the interior for a more difficult burning environment.  The upper ridge flattens Friday and transport winds become more north or northwesterly except for southern zones where light and variable winds will continue.  Temperatures cool to 8 to 14 degrees above average at interior locations.  With warm temperatures aloft the atmosphere will be a little more stable than on Thursday with only marginal smoke dispersal conditions over the south coast range and fair to good conditions other areas.   By Saturday a weak upper trough will reinforce the onshore flow and temperatures will drop a few more degrees although remain 3 to 9 degrees above average for most interior locations.  Smoke dispersal conditions will be fair to good with highest mixing heights over the Cascades, but peaking at only about 3000 feet for the coast range.

2.  DISPERSION

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

MORNING
Mixing height 1800 - 2800 ft.
Transport wind ENE to E at 9 - 15 mph.
Surface wind NE to E at 8 - 12 mph.

AFTERNOON
Mixing height rising above 5000 ft.
Transport wind similar to morning.
Surface wind similar to morning.

EVENING
Mixing height 4300 - 5000 ft.
Transport wind increases to NE to ENE at 15 - 25 mph.
Surface wind NNE to ENE at 6 - 12 mph.

Zone 605-611 (North Cascades):

MORNING
Mixing height 3500 - 4500 ft.
Transport wind E to ESE at 10 - 22 mph.
Surface wind E to ESE at 10 - 18 mph.

AFTERNOON
Mixing height rising above 5000 ft.
Transport wind decreases to E to ESE at 8 - 12 mph.
Surface wind ENE to ESE at 6 - 12 mph.

EVENING
Mixing height remains above 5000 ft.
Transport wind ENE to E at 10 - 18 mph.
Surface wind ENE to E at 8 - 12 mph.

Zone 615-620 (South Coast Range):

MORNING
Mixing height 1500 - 2500 ft.
Transport wind light and variable.
Surface wind light and variable and controlled by local terrain.

AFTERNOON
Mixing height rising above 5000 ft.
Transport wind ESE to SSE at 6 - 10 mph.
Surface wind increases to ESE to SSE at 6 - 10 mph.

EVENING
Mixing height 1000 - 1600 ft.
Transport wind becomes light and variable.
Surface wind becomes light and variable and controlled by local terrain.

Zone 616-623 (South Cascades):

MORNING
Mixing height 3100 - 4100 ft.
Transport wind ESE to SSE at 6 - 12 mph.
Surface wind ESE to SSE at 6 - 12 mph.

AFTERNOON
Mixing height rising above 5000 ft.
Transport wind becomes light and variable.
Surface wind becomes light and variable and controlled by local terrain.

EVENING
Mixing height 2000 - 3000 ft.
Transport wind increases to NW to N at 8 - 14 mph.
Surface wind shifts to NW to N at 5 - 9 mph.

OUTLOOK:

THURSDAY
In the north mixing height below 1000 ft early rising to 1500 to 2500 ft by late morning rising to 4200 to 5000 ft during the afternoon.  In the south mixing height below 1000 ft early rising to 2400 to 3400 ft by late morning rising to 3500 to 4500 ft during the afternoon.  Transport wind light and variable during the morning becoming NW to N at 6 - 10 mph during the afternoon.  Surface wind light and variable during the morning becoming NW to N at 6 - 10 mph during the afternoon.

FRIDAY
In the Coast Range mixing height below 1000 ft early rising to 1600 to 2600 ft by late morning rising to 2000-3000 ft during the afternoon.  In the Cascades mixing height below 1000 ft early rising to 3400 to 4400 ft by late morning rising to 5000 feet during the afternoon.  Transport wind light and variable.  Surface wind light and variable.

SATURDAY
In the north mixing height below 1000 ft early rising to 1300 to 2300 ft by late morning rising to 3500 to 4500 ft during the afternoon.  In the south mixing height below 1000 ft early rising to 2000 to 3000 ft by late morning rising to 3800 to 4800 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 Wednesday, July 7, 2010.
=================================================================

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, 620, and 622
Units should be 500 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.

Zone 607, 608, 616, and 617
Units should be 1000 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.

Zone 609, 610, and 611
Units should be 1500 tons or less, spaced 5 miles apart, and 10 miles from downwind SSRAs.

Zone 623
Use standard guidance matrix. (See section 5 below.)


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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