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

Tue Nov 24 14:32:46 PST 2009

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

ISSUED: Tuesday, November 24, 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 level ridge of high pressure still dominates Pacific Northwest weather on Wednesday.  The ridge axis will be on a line from central Nevada, across northeast Oregon and into northern Idaho.  Upper flow will be from the southwest but any rain will be well to the north of Oregon.  Low mixing heights and light winds will prevail.  Recommend against any burning as smoke dispersal conditions will be very poor.

    OUTLOOK (THURSDAY-SATURDAY)

On Thanksgiving Day the upper ridge moves east and an upper trough slowly approaches the Pacific Northwest.  A Pacific cold front will move into western Oregon during the day but not affect northeastern Oregon in any significant way.  Mixing heights will remain quite low for poor smoke dispersal conditions.  Cooler air aloft should improve dispersal conditions Friday.  By Saturday temporary high pressure again takes over for stabilization and deteriorating smoke dispersal conditions.

2.  DISPERSION

WEDNESDAY

Zone 630 and 632:
Mixing height below 1000 ft during the morning.  Afternoon mixing height rising to 1000 - 2000 ft then lowering below 1000 ft during the evening.

Transport wind S to SSW at 19 - 33 mph during the morning.  Transport wind decreases to SSW to SW at 15 - 29 mph during the afternoon and decreases to SSW to SW at 12 - 24 mph during the evening.

Surface wind SSE to SSW at 10 - 16 mph throughout the day.

Zone 633 - 638:
Mixing height below 1000 ft during the morning.  Afternoon mixing height rising to 1000 - 2000 ft then lowering below 1000 ft during the evening.

Transport wind SSE to SSW at 10 - 22 mph throughout the day.

Surface wind SE to S at 8 - 14 mph.

OUTLOOK:

THURSDAY
Mixing height 1200 to 2200 ft throughout the day.  In the west transport wind S to SSW at 16 - 30 mph.  In the east transport wind SSE to SSW at 12 - 22 mph.  Surface wind SSE to SSW at 8 - 14 mph.

FRIDAY
Mixing height 1500 to 2500 ft during the morning rising to 2500 to 3500 ft during the afternoon.  Transport wind W to NW at 6 - 12 mph.  Surface wind WSW to NW at 5 - 9 mph.

SATURDAY
Mixing height below 1000 ft early rising to 1000 to 2000 ft by late morning rising to 3000 to 4000 ft during 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 Wed, November 25, 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 SSE through SW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 35 miles to the SSE through SW in or near drainages leading to SSRAs.  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

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://omls.oregon.gov/pipermail/smi_northeast/attachments/20091124/70ea6bf1/attachment.html>