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

[ODF Smoke Management Instructions]

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

ISSUED: Tuesday, May 26, 2009       2:35 PM      Jim Little

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

The jet stream shifts northward on Wednesday as high pressure builds aloft.  Dry weather will prevail across the entire Pacific Northwest.  Temperatures should be up about five degrees from Tuesday.  Mixing heights will be high and smoke dispersal conditions will be good to excellent, but nighttime inversions will hold residual smoke close to the ground.

    OUTLOOK (THURSDAY-SATURDAY)

The upper level high pressure area continues to build.  The high center will be over the Great Basin and clockwise flow around the high could bring some moisture north for the possibility of afternoon or early evening thunderstorms Thursday and Friday, mainly over mountainous areas.  Mixing heights will remain favorable for good smoke dispersal conditions. A weather system moving across British Columbia flattens the ridge Friday and turns upper flow more southwesterly with lessons the chance for thunderstorms.

2.  DISPERSION

WEDNESDAY
Mixing height 3400 - 4400 ft during the morning.  Afternoon mixing height rises to 4600 - 5000 ft 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 NW to N at 5 - 9 mph during the afternoon 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 8 - 13 mph during the afternoon and evening.

OUTLOOK:

THURSDAY
Mixing height below 1000 ft early rising to 3400 to 4400 ft by late morning rising above 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming W to NW at 4 - 8 mph during the afternoon.  Surface wind light and variable during the morning becoming NW to NNE at 6 - 12 mph during the afternoon.

FRIDAY
Mixing height 2600 to 3600 ft during the morning rising above 5000 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.

SATURDAY
Mixing height below 1000 ft early rising to 4500 to 5000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming NW to N at 4 - 8 mph during the afternoon.  Surface wind light and variable.

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 Wednesday, May 27, 2009.
    ==================================================================

Avoid ignitions within 15 miles to the W 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.

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