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: Wednesday, May 19, 2010       2:35 PM      Jim Little

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

A complex upper low pressure area continues in the Gulf of Alaska.  A portion deepens and upper flow backs gradually from westerly to southwesterly by late in the day.  Transport winds will be generally southwesterly shifting to northwesterly during the day.  With continued cool air aloft (freezing level down to 5000 feet above sea level), mixing heights should be quite high for good smoke dispersal conditions.

    OUTLOOK (FRIDAY-SUNDAY)

The upper level low moves to off the Washington coast on Friday supporting another weak Pacific front.  This will move into western Oregon early in the day then spread to north-central and north-east Oregon during the day.  On Saturday the upper level low drifts eastward with enough moisture to continue for scattered showers.  By Sunday, as the upper low moves east of the area, upper level flow becomes dry northerly and the showers end for a generally dry day.  Transport winds will be mostly light and variable.  Mixing heights should be high enough throughout the outlook period for fair to good smoke dispersal conditions.

2.  DISPERSION

THURSDAY

Zone 630 and 632:
Mixing height 2800 - 3800 ft during the morning.  Mixing height rises to above 5000 ft during the afternoon then lowers to 2000 - 3000 ft during the evening.

Transport wind SW to W at 8 - 14 mph during the morning.  Transport wind decreases to W to NW at 5 - 9 mph during the afternoon then becomes light and variable and controlled by local terrain during the evening.

Surface wind SW to W at 8 - 12 mph during the morning.  Surface wind decreases to W to NW at 4 - 8 mph during the afternoon then becomes light and variable and controlled by local terrain during the evening.

Zone 633 - 638:
Mixing height 4400 - 5000 ft during the morning.  Mixing height rises above 5000 ft during the afternoon then lowers below 1000 ft during the evening.

Transport wind WSW to WNW at 8 - 14 mph during the morning and afternoon.  Transport wind becomes light and variable and controlled by local terrain during the evening.

Surface wind WSW to WNW at 8 - 14 mph during the morning and afternoon.  Surface wind becomes light and variable and controlled by local terrain during the evening.

OUTLOOK:

FRIDAY
Mixing height below 1000 ft early rising to 2100 to 3100 ft by late morning rising to 4000 to 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming WNW to NNW at 8 - 14 mph during the afternoon.  Surface wind light and variable during the morning becoming WNW to NNW at 6 - 12 mph during the afternoon.

SATURDAY
Mixing height 2800 to 3800 ft during the morning rising to 4500 to 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming WNW to NNW at 4 - 8 mph during the afternoon.  Surface wind light and variable.

SUNDAY
Mixing height 2000 to 3000 ft during the morning rising to 4000 to 5000 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 Thursday, May 20, 2010.
    ==================================================================

Zone 630 and 632:
Avoid ignitions within 12 miles to the SW through NNE of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 20 miles to the SW through NNE in or near drainages leading to SSRAs.  Verify transport winds away from SSRAs if burning in any other direction.

Zone 633 - 638:
Avoid ignitions within 12 miles to the WSW through NW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 20 miles in all directions of SSRAs.  Complete ignitions by 4:00pm.

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