SMI Northeast (Smoke Management Instructions) Northeast Oregon Smoke Management Instructions

Wed May 27 14:29:31 PDT 2009

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

ISSUED: Wednesday, May 27, 2009       2:35 PM      Jim Little

1.  DISCUSSION AND FORECAST FOR NORTHEAST FORECAST AREA ZONES 630-638

A strong upper ridge sets up over the Great Basin on Thursday.  Clockwise flow around the low gives Oregon a south to southwest flow aloft.  This could bring up some high level moisture from the south for a chance of afternoon or evening mountain thunderstorms.  Transport winds will be mostly north or northwesterly.  Mixing heights remain high for good smoke dispersal conditions.

    OUTLOOK (FRIDAY-SUNDAY)

Temperatures will remain above average across the state through the outlook period.  The upper ridge strengthens Friday.  The chance for afternoon or evening mountain thunderstorms continues.
Mixing heights should be above 5000 feet.  Expect northerly transport winds Friday.  The upper ridge gets flattened by a weather system moving across northern British Columbia.  However, sunny, warm conditions will continue.  Transport winds remain generally west or northwesterly over the weekend.

2.  DISPERSION

THURSDAY

Zone 630 and 632:
Mixing height 2700 - 3700 ft during the morning.  Mixing height rises to above 5000 ft during the afternoon then lowers to 1000 - 1700 ft during the evening.

Transport wind light and variable and controlled by local terrain during the morning.  Transport wind increases to WNW to NNW at 5 - 9 mph during the afternoon then shifts and increases to N to NE at 10 - 20 mph during the evening.

Surface wind light and variable and controlled by local terrain during the morning.  Surface wind increases to NW to N at 8 - 12 mph during the afternoon and evening.

Zone 633 - 638:
Mixing height 2800 - 3800 ft during the morning.  Mixing height rises above 5000 ft during the afternoon then lowers below 1000 ft during the evening.

Transport wind light and variable and controlled by local terrain during the morning.  Transport wind increases to W to NW at 4 - 8 mph during the afternoon then shifts and increases to NNW to NNE at 10 - 22 mph during the evening.

Surface wind light and variable and controlled by local terrain during the morning.  Surface wind increases to NW to N at 6 - 10 mph during the afternoon and evening.

OUTLOOK:

FRIDAY
Mixing height below 1000 ft early rising to 3500 to 4500 ft by late morning rising to 4200 to 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming WSW to WNW at 6 - 12 mph during the afternoon.  Surface wind light and variable during the morning becoming NW to N at 8 - 14 mph during the afternoon.

SATURDAY
Mixing height 2800 to 3800 ft during the morning rising to 4500 to 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming NNW to NNE at 10 - 18 mph during the afternoon.  Surface wind light and variable during the morning becoming NNW to NNE at 10 - 20 mph during the afternoon.

SUNDAY
Mixing height 2800 to 3800 ft during the morning rising to 4500 to 5000 ft during the afternoon.  Transport wind NNW to NNE at 6 - 10 mph during the morning becoming NNW to NNE at 10 - 20 mph during the afternoon.  Surface wind NNW to NNE at 6 - 12 mph during the morning becoming NNW to NNE at 10 - 22 mph during the afternoon.

3.  BURNING INSTRUCTIONS FOR NORTHEAST OREGON ZONES 630-638
    The following considerations should be adhered to in addition to
    the requirements of the Oregon Smoke Management Plan. These
    Instructions are valid for burning conducted on Thursday, May 28, 2009.
    ==================================================================

Zone 630 and 632:
Avoid ignitions within 15 miles to the WNW through NE of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 30 miles in all directions of SSRAs.  Verify transport winds away from SSRAs if burning in any other direction.  Recommend against burning units that will smolder significantly overnight.  Complete ignitions by 4:00pm.

Zone 633 - 638:
Avoid ignitions within 15 miles in all directions of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 30 miles in all directions of SSRAs.  Recommend against burning units that will smolder significantly overnight.  Complete ignitions by 4:00pm.

    =========================================================
4.  SPECIAL NOTE:

    The smoke management forecaster is available at (503)-
    945-7401. Please call this number and not individual's
    numbers to discuss daily burning.  For large burns (over
    2000 tons) or burns extending over a considerable period,
    please request a special forecast.  Avoid calling before
    8 a.m. and between 2 to 3 p.m.

    This 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

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