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, April 7, 2009       2:35 PM      Nick Yonker

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

Complex weather pattern is over the region today with an upper level low to the south and a ridge to the north.  The low will spin up some light moisture into southern Oregon tonight with a chance of some light showers overnight and Wednesday.  The upper level ridge to the north will gradually slip to the east and give way to an incoming trough later Wednesday.  Expect cooler conditions as offshore flow turns to onshore later this afternoon and evening.  Onshore flow will get firmly established over the region Wednesday.  Cooling air mass aloft will destabilize the air mass and make for better smoke dispersion conditions.

OUTLOOK (THURSDAY - SATURDAY):

Upper level trough in the eastern Pacific will gradually move in and bring a cold front to the region on Thursday.  Upper level trough moves through Friday bringing scattered showers and continued cool, unstable conditions.  A minor ridge moves in on Saturday bringing mostly dry weather but remaining cool and unstable.  Smoke dispersion will remain good to excellent through the period.

2.  DISPERSION

WEDNESDAY
Mixing height below 1000 ft early rising to 3500 - 4500 ft by late morning.  Afternoon mixing height rises above 5000 ft then lowers to 2200 - 3200 ft during the evening.

Transport wind WNW to NW at 12 - 24 mph.

Surface wind WNW to NNW at 9 - 15 mph during the morning and afternoon.  Surface wind decreases to WNW to NNW at 6 - 10 mph during the evening.

OUTLOOK:

THURSDAY
Mixing height below 1000 ft early rising above 5000 ft by late morning and through the afternoon.  Transport wind S to SW at 6 - 10 mph.  Surface wind light and variable during the morning becoming SSW to WSW at 4 - 8 mph during the afternoon.

FRIDAY
Mixing height 3800 to 4800 ft during the morning rising above 5000 ft during the afternoon.  Transport wind WNW to NNW at 10 - 18 mph.  Surface wind WNW to NW at 8 - 14 mph.

SATURDAY
Mixing height below 1000 ft early rising to 4000 to 5000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind SW to W at 10 - 20 mph.  Surface wind SW to W at 6 - 10 mph.

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, April 8, 2009.
    ==================================================================

Avoid ignitions within 12 miles to the W through NW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 20 miles to the SW through NW in or near drainages leading to 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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