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 4, 2010       2:35 PM      Jim Little

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

An upper level disturbance in the west-northwesterly flow aloft develops into a closed low over Washington by morning.  This will produce areas of light rain throughout the region.  Once again snow is possible as low as 1500 feet ASL.  Mixing heights should be above 5000 feet for good smoke dispersal conditions with a generally northwesterly transport wind.

    OUTLOOK (THURSDAY-SATURDAY)

The upper low moves east and weak ridging aloft develops over the area by Thursday.  The showers will end.  Maximum mixing heights will remain high but very light transport winds might limit burn opportunities.  Friday and Saturday will see light westerly flow aloft with dry conditions.  Winds will be generally southeasterly Friday.  By Saturday transport winds will be picking up from the northwest and maximum mixing height will remain high.  Clearing skies and nighttime inversions will hold any residual smoke close to the ground during the overnight period.

2.  DISPERSION

WEDNESDAY

Zone 630 and 632:
Mixing height 2600 - 3600 ft during the morning.  Mixing height rises to above 5000 ft during the afternoon then lowers to 2100 - 3100 ft during the evening.

Transport wind NW to NNW at 10 - 16 mph during the morning.  Transport wind increases to WNW to NW at 12 - 22 mph during the afternoon and evening.

Surface wind NW to NNW at 8 - 14 mph throughout the day.

Zone 633 - 638:
Mixing height 1400 - 2400 ft during the morning.  Mixing height rises to above 5000 ft during the afternoon then lowers to 1700 - 2700 ft during the evening.

Transport wind NW to NNW at 10 - 16 mph throughout the day.

Surface wind NW to NNW at 8 - 14 mph.

OUTLOOK:

THURSDAY
Mixing height 2400 to 3400 ft during the morning rising above 5000 ft during the afternoon.  Transport wind WNW to NNW at 8 - 12 mph.  Surface wind WNW to NNW at 6 - 10 mph.

FRIDAY
Mixing height 2800 to 3800 ft during the morning rising above 5000 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.

SATURDAY
Mixing height 2800 to 3800 ft during the morning rising above 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming WNW to NNW at 5 - 9 mph during the afternoon.  Surface wind light and variable during the morning becoming NW to N at 4 - 8 mph during the afternoon.

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 5, 2010.
    ==================================================================

Zone 630 and 632:
Avoid ignitions within 12 miles to the WNW through N of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 20 miles to the WNW through N in or near drainages leading to SSRAs.

Zone 633 - 638:
Avoid ignitions within 12 miles to the WNW through NNW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 12 miles to the W through NNW in or near drainages leading to 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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