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 6, 2009       2:35 PM      Nick Yonker

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

Upper level trough in the eastern Pacific is ejecting a frontal system through the region today.  Front will move east of the region tonight with moisture diminishing.  Cooler air moving in aloft will lower the snow level down to 4000 - 5000 ft tomorrow morning.  With the upper trough moving through tomorrow, expect a chance of continued showers.  Showers should end by Thursday evening.  Air mass will continue unstable and smoke dispersion good through tomorrow.

    OUTLOOK (FRIDAY - SUNDAY):

Flat upper level ridge will dry out and stabilize the air mass early Friday.  However, daytime heating should bring mixing levels up into the good category again.  Generally the pattern will remain dry and tranquil through Sunday.  A trough will approach Sunday and bring a marine push Sunday afternoon.  Air mass will maintain a stable morning, unstable afternoon pattern through the period.  Wind flow will remain mainly light, favoring northerly flow Friday and Saturday, then turning onshore on Sunday.  Smoke dispersion will be mostly fair.

2.  DISPERSION

THURSDAY
Mixing height below 3000 ft early rising above 5000 ft by late morning.  Mixing height lowers to 2500 - 3500 ft during the evening.

Transport wind W to NW at 10 - 16 mph during the morning.  Transport wind increases to W to NW at 12 - 24 mph during the afternoon and evening.

Surface wind WNW to NW at 9 - 15 mph during the morning and afternoon.  Surface wind decreases to NW to N at 7 - 13 mph during the evening.

OUTLOOK:

FRIDAY
Mixing height below 1000 ft early rising to 4000 to 5000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable during the morning becoming NW to N at 5 - 9 mph during the afternoon.

SATURDAY
Mixing height below 1000 ft early rising to 3500 to 4500 ft by late morning rising above 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming NW to NNE at 5 - 9 mph during the afternoon.  Surface wind light and variable during the morning becoming NW to NNE at 4 - 8 mph during the afternoon.

SUNDAY
Mixing height below 1000 ft early rising to 3500 to 4500 ft by late morning rising above 5000 ft during the afternoon.  Transport wind SSW to SW at 9 - 15 mph during the morning becoming W to NW at 10 - 22 mph during the afternoon.  Surface wind S to SW at 6 - 10 mph during the morning becoming W to NW at 9 - 15 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 Thursday, May 7, 2009.
    ==================================================================

Avoid ignitions within 10 miles to the WSW through N of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 15 miles in all directions of SSRAs.

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