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 11, 2010       2:35 PM      Jim Little

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

    WEDNESDAY

An upper level ridge slowly moves eastward across the region. By late afternoon the axis of this ridge extends from eastern British Columbia to southwestern Oregon.  Expect dry northerly upper level flow on the east side of that ridge.  Warm daytime temperatures should push daytime mixing heights quite high for good smoke dispersal conditions.  Clearing skies at night will allow surface based inversions to form and trap any residual smoke near the surface overnight and into early morning hours.

    OUTLOOK (THURSDAY-FRIDAY)

The upper ridge weakens on Thursday with a light, generally westerly, flow aloft throughout the outlook period.  Periodic minor impulses ripple across the region in the westerlies aloft but should do little to affect sensible weather.  Weather will remain dry.  Skies will be generally sunny.  Mixing heights fairly high for generally good smoke dispersal conditions.  Clearing skies at night will allow surface based inversions to form and trap any residual smoke near the surface overnight and into early morning hours.

2.  DISPERSION

WEDNESDAY
Mixing height 3600 - 4600 ft during the morning.  Mixing height rises above 5000 ft during the afternoon then lowers to 1600 - 2600 ft during the evening.

Transport wind NNW to NNE at 7 - 13 mph.

Surface wind NNW to NNE at 7 - 13 mph during the morning and afternoon.  Surface wind decreases to N to NE at 5 - 9 mph during the evening.

OUTLOOK:

THURSDAY
Mixing height below 1000 ft early rising above 5000 ft by late morning and through the afternoon.  Transport wind light and variable.  Surface wind light and variable.

FRIDAY
Mixing height below 1000 ft early rising above 5000 ft by late morning and through the afternoon.  Transport wind light and variable.  Surface wind light and variable.

SATURDAY
Mixing height below 1000 ft early rising above 5000 ft by late morning and through the afternoon.  Transport wind light and variable.  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 12, 2010.
    ==================================================================

Avoid ignitions within 10 miles to the NNW through NE of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 15 miles to the NNW through E in or near drainages leading to SSRAs.

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