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: Sunday, May 31, 2009       2:35 PM      Jim Little

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

An upper level ridge centered over the northern Great Basin will keep conditions warm into the first part of next week.  Southerly flow will continue to produce enough moisture for the threat of afternoon and evening thunderstorms mainly over the Cascades.  Nighttime inversions will hold smoke close to the ground overnight and into the morning hours.  During the afternoon mixing heights will improve smoke dispersal conditions to good most areas.

    OUTLOOK (TUESDAY - THURSDAY):

The upper level ridge slips slowly eastward and an upper level low moves slightly closer to the California coastline on Monday.  Upper flow will continue to bring moisture northward for the threat of afternoon and evening thunderstorms.  The upper low remains off the California coast through the outlook period.  Afternoon instability will help smoke dispersion, but the window for acceptable smoke dispersal conditions remains narrow with marginal conditions evenings and mornings.

2.  DISPERSION

MONDAY

Zone 630 and 632:
Mixing height 3900 - 4900 ft during the morning.  Afternoon mixing height lowers to 3100 - 4100 ft then lowers below 1000 ft during the evening.

Transport wind NNE to ENE at 4 - 8 mph during the morning.  Transport wind increases to NNE to ENE at 12 - 24 mph during the afternoon and increases to NNE to ENE at 15 - 29 mph during the evening.

Surface wind light and variable and controlled by local terrain during the morning.  Surface wind increases to NNW to NNE at 9 - 15 mph during the afternoon and evening.

Zone 633 - 638:
Mixing height 3500 - 4500 ft during the morning.  Mixing height rises above 5000 ft during the afternoon then lowers below 1000 ft during the evening.

Transport wind N to ENE at 4 - 8 mph during the morning.  Transport wind increases to N to NE at 10 - 20 mph during the afternoon and evening.

Surface wind NW to N at 4 - 8 mph during the morning.  Surface wind increases to NW to N at 10 - 18 mph during the afternoon and evening.

OUTLOOK:

TUESDAY
Mixing height below 1000 ft early rising above 5000 ft by late morning and through the afternoon.  Transport wind light and variable during the morning becoming NNW to N at 10 - 16 mph during the afternoon.  Surface wind WSW to WNW at 5 - 7 mph during the morning becoming NW to N at 6 - 12 mph during the afternoon.

WEDNESDAY
Mixing height 2600 to 3600 ft during the morning rising above 5000 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.

THURSDAY
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.

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 Monday, June 1, 2009.
    ==================================================================

Zone 630 and 632:
Avoid ignitions within 15 miles to the NNE through ENE of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 30 miles to the NW through ENE in or near drainages leading to SSRAs.  Verify transport winds away from SSRAs if burning in any other direction.  Recommend against burning units that will smolder significantly overnight.  Complete ignitions by 4:00pm.

Zone 633 - 638:
Avoid ignitions within 15 miles to the N through NE of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 30 miles to the NNW through NE in or near drainages leading to SSRAs.  Verify transport winds away from SSRAs if burning in any other direction.  Recommend against burning units that will smolder significantly overnight.  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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