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, October 26, 2009       2:35 PM      Jim Little

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

The wet Pacific cold front that brought considerable rain to the region Monday will be well to the east and dissipating.  The cool upper trough supporting that system will move to the northern Rockies leaving a cool northerly flow aloft over Oregon.  This will keep the atmosphere destabilized with mixing heights above 5000 feet most areas.  Winds will remain brisk for favorable smoke dispersal conditions most areas.  Expect scattered showers (snow above about 2500 feet) during the day, gradually dissipating by late afternoon.

    OUTLOOK (WEDNESDAY-FRIDAY)

An upper level ridge builds in the eastern Pacific and moves over the region on Wednesday.  Weather will be dry, however the ridge will progress to the east and allow another Pacific warm front to approach the coast Wednesday evening.  Precipitation will reach northeastern Oregon during the afternoon Thursday.  Friday will see showers with another Pacific front due in on Saturday.  Mixing heights should remain fairly high for good smoke dispersal conditions through the outlook period.


2.  DISPERSION

TUESDAY

Zone 630 and 632:
Mixing height 2800 - 3800 ft during the morning.  Mixing height rises above 5000 ft during the afternoon and evening.

Transport wind NW to NNW at 18 - 30 mph.

Surface wind WNW to NNW at 12 - 22 mph throughout the day.

Zone 633 - 638:
Mixing height 2700 - 3700 ft during the morning.  Mixing height rises to above 5000 ft during the afternoon then lowers to 3500 - 4500 ft during the evening.

Transport wind WNW to NW at 12 - 22 mph throughout the day.

Surface wind WNW to NW at 10 - 18 mph.

OUTLOOK:

WEDNESDAY
In the west mixing height 1400 to 2400 ft during the morning rising to 3500 to 4500 ft during the afternoon.  In the east mixing height 2200 to 3200 ft during the morning rising to 3500 to 4500 ft during the afternoon.  Transport wind NW to N at 9 - 15 mph.  Surface wind NW to N at 6 - 12 mph.

THURSDAY
Mixing height below 1000 ft early rising to 1000 to 2000 ft by late morning rising to 3500 to 4500 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.

FRIDAY
Mixing height 2800 to 3800 ft during the morning rising to 4500 to 5000 ft during the afternoon.  Transport wind WSW to NW at 5 - 9 mph during the morning becoming light and variable 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 Tuesday, October 27, 2009.
    ==================================================================

Zone 630 and 632:
Avoid ignitions within 10 miles to the NW through NNW of SSRAs.  Care needed in selecting units as smoke will likely fumigate along the ground in wind prone areas.  No additional restrictions necessary.

Zone 633 - 638:
Avoid ignitions within 10 miles to the WNW through N of SSRAs.  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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