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

ODF Smoke Management Instructions smi_northeast at listsmart.osl.state.or.us
Mon Nov 23 14:28:47 PST 2009


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

ISSUED: Monday, November 23, 2009       2:35 PM      Jim Little

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

      ** Unfavorable burning situation due to very poor smoke dispersion. **

An upper ridge of high pressure remains over the region on Tuesday producing stagnant conditions with light winds and low mixing heights.  Smoke dispersal conditions will be poor and recommend against burning Tuesday and Wednesday.  Mixing heights will generally be in the 1000-1500 foot range.  While light, transport winds will have a southerly tendency.

    OUTLOOK (WEDNESDAY-FRIDAY)

On Wednesday the upper ridge axis shifts east but the ridge itself still dominates Pacific Northwest weather.  Low mixing heights and light winds continue.  By Thanksgiving Day the ridge will be off to the east and an upper level trough will approach.  A weakening Pacific cold front will spread rain into western Oregon late in the day.  Smoke dispersal conditions will improve, especially in the south.  Friday looks showery with another weak Pacific cold front late in day.  Expect fair to good smoke dispersal conditions.


2.  DISPERSION

TUESDAY

Zone 630 and 632:
Mixing height below 1000 ft during the morning.  Afternoon mixing height rising to 1000 - 1700 ft then lowering below 1000 ft during the evening.

Transport wind S to SW at 8 - 14 mph.

Surface wind SSE to SSW at 5 - 9 mph throughout the day.

Zone 633 - 638:
Mixing height below 1000 ft during the morning.  Afternoon mixing height rising to 1000 - 1700 ft then lowering below 1000 ft during the evening.

Transport wind SSW to SW at 8 - 14 mph during the morning.  Transport wind decreases to SE to SSW at 5 - 9 mph during the afternoon and evening.

Surface wind SSE to SW at 5 - 9 mph during the morning.  Surface wind becomes light and variable and controlled by local terrain during the afternoon then increases to SE to S at 5 - 9 mph during the evening.

OUTLOOK:

WEDNESDAY
Mixing height 1000 to 1700 ft throughout the day.  Transport wind S to SW at 9 - 15 mph during the morning becoming S to SSW at 12 - 24 mph during the afternoon.  Surface wind SSE to SSW at 6 - 10 mph.

THURSDAY
Mixing height below 1000 ft during the morning rising to 1500 to 2500 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.

FRIDAY
Mixing height 3200 to 4200 ft during the morning rising to 4400 to 5000 ft during the afternoon.  Transport wind W to NW at 6 - 12 mph.  Surface wind WSW to NW at 5 - 9 mph.

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 Tuesday, November 24, 2009.
    ==================================================================

Zone 630 and 632:
Unfavorable burning situation due to very poor smoke dispersion.  Delay ignitions until 10:00am.  Avoid ignitions within 20 miles to the S through SW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 35 miles to the S through SW in or near drainages leading to SSRAs.  Recommend against burning units that will smolder significantly overnight.  Complete ignitions by 3:00pm.

Zone 633 - 638:
Unfavorable burning situation due to very poor smoke dispersion.  Delay ignitions until 10:00am.  Avoid ignitions within 20 miles to the SE through WSW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 35 miles to the SE through WSW in or near drainages leading to 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 3:00pm.

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