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, May 25, 2010       2:35 PM      Jim Little

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

    WEDNESDAY

An upper level low, elongated NW to SE on an axis from about 600 miles west of Astoria to just off the northern California coast is the main weather feature for Wednesday.  Moisture will rotate into the Pacific Northwest on the counter-clockwise flow around that low for scattered showers.  Cool air aloft and daytime heating will help to destabilize the atmosphere in the afternoon for an increased chance of showers with the possibility of thunderstorms but also providing for high mixing heights and good smoke dispersal conditions.

    OUTLOOK (THURSDAY-SATURDAY)

The upper low moves to a position just off the northern California coast.  Weather Thursday should be a near repeat of Wednesday.  Cool air aloft should help provide good smoke dispersal conditions.  By Friday the upper low moves into Nevada.  Counter-clockwise flow around that low means a more northerly wind pattern aloft over the region.  This is a drier pattern, but again, shower can't be ruled out.  Finally on Saturday the upper low is out of the picture, surface high pressure noses into Oregon from the southwest and dry weather is likely.  Friday and Saturday will see a continuation of high daytime mixing heights and good smoke dispersal conditions.

2.  DISPERSION

WEDNESDAY
Mixing height 2500 - 3500 ft during the morning.  Mixing height rises above 5000 ft during the afternoon then lowers below 1000 ft during the evening.

Transport wind S to SW at 6 - 10 mph during the morning.  Transport wind becomes light and variable and controlled by local terrain during the afternoon and evening.

Surface wind S to SW at 5 - 9 mph during the morning.  Surface wind becomes light and variable and controlled by local terrain during the afternoon and evening.

OUTLOOK:

THURSDAY
Mixing height below 1000 ft early rising to 2500 to 3500 ft by late morning rising above 5000 ft during the afternoon.  Transport wind NW to N at 6 - 10 mph during the morning becoming W to NW at 8 - 14 mph during the afternoon.  Surface wind NW to N at 4 - 8 mph during the morning becoming WSW to NW at 5 - 9 mph during the afternoon.

FRIDAY
Mixing height below 1000 ft early rising to 3000 to 4000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.

SATURDAY
Mixing height 2000 to 3000 ft during the morning rising above 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming NW to N at 5 - 9 mph during the afternoon.  Surface wind light and variable during the morning becoming NW to N at 4 - 8 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 Wednesday, May 26, 2010.
    ==================================================================

Avoid ignitions within 15 miles in all directions of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 30 miles in all directions of SSRAs.  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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