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 6, 2009       7:45 AM      Jim Little

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

A strong upper level ridge of high pressure lies on an axis from southern Nevada to northern Idaho.  Offshore a deep upper level trough lies about 600 miles west-southwest of San Francisco and an upper trough is just off the British Columbia coast.  At the surface the highest pressures are over western Montana and northern Colorado, while a reflection of the upper level low off the California coastline is located west-southwest of San Francisco.  The net result of this will be a generally southeasterly transport.  Smoke dispersal conditions will be good during the afternoons but collapse due to a nighttime inversion during the evening.

2.  DISPERSION

MONDAY

Zone 630 and 632:
Mixing height 1700 - 2700 ft during the morning.  Mixing height rises above 5000 ft during the afternoon then lowers below 1000 ft during the evening.

Transport wind SE to S at 8 - 14 mph during the morning.  Transport wind decreases to ESE to S at 5 - 9 mph during the afternoon then increases to ESE to SE at 9 - 15 mph during the evening.

Surface wind light and variable and controlled by local terrain during the morning.  Surface wind increases to NNE to ENE at 6 - 10 mph during the afternoon then becomes light and variable during the evening.

Zone 633 - 638:
Mixing height 2400 - 3400 ft during the morning.  Afternoon mixing height rises to 4300 - 5000 ft then lowers below 1000 ft during the evening.

Transport wind SE to S at 9 - 15 mph throughout the day.

Surface wind ESE to SSE at 4 - 8 mph during the morning.  Surface wind shifts to ENE to ESE at 6 - 10 mph during the afternoon then becomes light and variable and controlled by local terrain during the evening.

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, April 6, 2009.
    ==================================================================

Zone 630 and 632:
Avoid ignitions within 15 miles to the E through S of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 30 miles to the E through S 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.

Zone 633 - 638:
Avoid ignitions within 15 miles to the SE through SSW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 30 miles to the ESE through SSW in or near drainages leading to SSRAs.  Recommend against burning units that will smolder significantly overnight.

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