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, May 3, 2010       2:35 PM      Jim Little

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

A very cool air mass for this time of year will remain over the region.  Temperatures will be about 10 degrees below average.  Moisture will be limited but a few showers are likely with most of those showers being snow.  Cool air aloft will keep the atmosphere unstable for good smoke dispersal conditions.

    OUTLOOK (WEDNESDAY-FRIDAY)

Temperatures begin to recover a bit but below average readings will continue Wednesday.  Widely scattered showers are still likely and smoke dispersal conditions will remain good.  Weak upper level ridging on Thursday will ensure dry weather.  Cool air aloft and daytime surface heating will push daytime mixing heights to above 5000 feet but this will be offset by quite light transport winds that may limit burning in some areas.  Light winds and clearing skies mean nighttime inversions to trap smoke near the ground during the overnight period.  By Friday temperatures should be back to near normal.  A weak disturbance moving through a generally westerly flow aloft may produce a few mountain showers.  Mixing heights remain high for good smoke dispersal conditions.

2.  DISPERSION

TUESDAY

Zone 630 and 632:
Mixing height above 5000 ft throughout the day.  Mixing height lowers to 1800 - 2800 ft during the evening.

Transport wind W to NW at 8 - 14 mph during the morning and afternoon.  Transport wind increases to NNW to NNE at 10 - 18 mph during the evening.

Surface wind W to NW at 8 - 12 mph throughout the morning and afternoon.  Surface wind shifts to NNW to NNE at 8 - 12 mph during the evening.

Zone 633 - 638:
Mixing height 2800 - 3800 ft during the morning.  Mixing height rises above 5000 ft during the afternoon then lowers below 1000 ft during the evening.

Transport wind WSW to WNW at 10 - 16 mph throughout the morning and afternoon.  Transport wind shifts to NNW to NNE at 6 - 10 mph during the evening.

Surface wind WSW to WNW at 9 - 15 mph during the morning and afternoon.  Surface wind becomes light and variable and controlled by local terrain during the evening.

OUTLOOK:

WEDNESDAY
Mixing height 1500 to 2500 ft during the morning rising to 4000 to 5000 ft during the afternoon.  Transport wind NW to NNW at 10 - 16 mph.  Surface wind NW to NNW at 7 - 13 mph.

THURSDAY
Mixing height below 1000 ft early rising to 4500 to 5000 ft by late morning and through the afternoon.  Transport wind light and variable.  Surface wind light and variable.

FRIDAY
Mixing height below 1000 ft early rising to 3000 to 4000 ft by late morning rising to 4500 to 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 Tuesday, May 4, 2010.
    ==================================================================

Zone 630 and 632:
Avoid ignitions within 10 miles to the W through NE of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 15 miles to the W through NE in or near drainages leading to SSRAs.

Zone 633 - 638:
Avoid ignitions within 15 miles to the WSW through NNE of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 30 miles to the WSW through NNE in or near drainages leading to SSRAs.  Watch for shifting transport winds.  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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