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: Monday, April 26, 2010       2:35 PM      Jim Little

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

    TUESDAY

A deep trough extends from the Gulf of Alaska southeastward to Oregon.  The cold front that moved into western Oregon Monday sweeps across eastern Oregon bringing rain to the region.  The air mass will be quite unstable and maximum mixing heights will go above 5000 feet for good smoke dispersal conditions.

    OUTLOOK (WEDNESDAY-FRIDAY)

Showery weather continues Wednesday across the region. The upper trough weakens but periodic impulses move NNW to SSE across the state to keep showers going into Friday.  Maximum mixing heights should reach 5000 feet plus throughout the outlook period for good smoke dispersal conditions.

2.  DISPERSION

TUESDAY

Zone 630 and 632:
Mixing height 3400 - 4400 ft during the morning.  Mixing height rises to above 5000 ft during the afternoon then lowers to 2700 - 3700 ft during the evening.

Transport wind SSW to SW at 20 - 36 mph during the morning.  Transport wind shifts to WNW to NW and decreases to 18 - 30 mph during the afternoon then decreases to W to WNW at 12 - 22 mph during the evening.

Surface wind SSW to SW at 13 - 25 mph during the morning.  Surface wind shifts to WNW to NW and decreases to 10 - 20 mph during the afternoon then decreases to WSW to NW at 6 - 12 mph during the evening.

Zone 633 - 638:

Transport wind SSW to SW at 13 - 25 mph throughout the morning and afternoon.  Transport wind shifts to W to WNW at 12 - 22 mph during the evening.

Surface wind S to SW at 10 - 20 mph throughout the morning and afternoon.  Surface wind shifts to WSW to WNW at 9 - 15 mph during the evening.


OUTLOOK:

WEDNESDAY
Mixing height 2400 to 3400 ft during the morning rising above 5000 ft during the afternoon.  Transport wind WSW to WNW at 12 - 24 mph.  Surface wind WSW to WNW at 9 - 15 mph.

THURSDAY
Mixing height 2800 to 3800 ft during the morning rising above 5000 ft during the afternoon.  Transport wind SSE to SW at 6 - 10 mph during the morning becoming W to NW at 5 - 9 mph during the afternoon.  Surface wind SSE to SW at 4 - 8 mph during the morning becoming W to NW at 4 - 8 mph during the afternoon.

FRIDAY
Mixing height 3200 to 4200 ft during the morning rising above 5000 ft during the afternoon.  Transport wind SW to WNW at 4 - 8 mph.  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 Tuesday, April 27, 2010.
    ==================================================================

Zone 630 and 632:
Avoid ignitions within 12 miles to the SSW through NW of SSRAs.  Care needed in selecting units as smoke will likely fumigate along the ground in wind prone areas.  Watch for shifting transport winds.  No additional restrictions necessary.

Zone 633 - 638:
Avoid ignitions within 10 miles to the SSE through WNW of SSRAs.  Watch for shifting transport winds.  No additional restrictions necessary.

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