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 18, 2010       2:35 PM      Jim Little

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

    WEDNESDAY

A deep surface low pressure area will track north-northeastward off the Oregon Coast on Wednesday.  Southerly flow ahead of this system will push freezing levels to above 10,000 feet and keep temperatures quite warm.  Rain from a Pacific cold associated with the northward-tracking low crosses the Cascades and spreads across the region during the evening hours.

    OUTLOOK (THURSDAY-SATURDAY)

An upper level trough swings through early in the day Thursday.  Temperatures will be much cooler.  Showers will be on the decrease.  Mixing heights will be quite high for good smoke dispersal conditions.  Clearing skies overnight will mean low level inversions many areas Friday morning.  But daytime heating should help mixing heights recover to near 4000 feet by afternoon for fair to good smoke dispersal conditions.  A weak upper level trough will bring scattered showers to the region Saturday.

2.  DISPERSION

WEDNESDAY

Zone 630 and 632:
Mixing height below 500 ft early rising above 5000 ft by late morning.  Mixing height lowers to 4000 - 5000 ft during the evening.

Transport wind SSE to SSW at 15 - 29 mph during the morning.  Transport wind shifts to SSW to WSW and increases to 22 - 40 mph during the afternoon and evening.

Surface wind SSE to SSW at 12 - 24 mph during the morning.  Surface wind shifts to SSW to WSW at 15 - 25 mph during the afternoon and evening.

Zone 633 - 638:
Mixing height below 500 ft early rising above 5000 ft by late morning.

Transport wind SSE to SSW at 10 - 18 mph during the morning.  Transport increases to S to SSW at 14 - 28 mph during the afternoon then shifts to SW to WSW and decreases to 10 - 16 mph during the evening.

Surface wind SSE to SSW at 9 - 15 mph during the morning.  Surface increases to S to SSW at 12 - 22 mph during the afternoon then shifts to SSW to W and decreases to 6 - 10 mph during the evening.

OUTLOOK:

THURSDAY
In the west mixing height 3900 to 4900 ft during the morning rising above 5000 ft during the afternoon.  In the east mixing height 2700 to 3700 ft during the morning rising above 5000 ft during the afternoon.  Transport wind WSW to WNW at 10 - 22 mph during the morning becoming WSW to WNW at 6 - 10 mph during the afternoon.  Surface wind WSW to WNW at 8 - 14 mph.

FRIDAY
Mixing height 2500 to 3500 ft during the morning rising to 3500 to 4500 ft during the afternoon.  Transport wind light and variable during the morning becoming W to NW at 5 - 9 mph during the afternoon.  Surface wind light and variable during the morning becoming W to NW at 4 - 8 mph during the afternoon.

SATURDAY
Mixing height 3500 to 4500 ft during the morning rising to 4500 to 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming W to NW at 5 - 9 mph during the afternoon.  Surface wind light and variable during the morning becoming W to NW 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 19, 2010.
    ==================================================================

Zone 630 and 632:
Avoid ignitions within 10 miles to the S through SW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 10 miles to the S through W in or near drainages leading to SSRAs.  Care needed in selecting units as smoke will likely fumigate along the ground in wind prone areas.  No additional restrictions necessary.

Zone 633 - 638:
Avoid ignitions within 10 miles to the SSE through WSW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 10 miles to the SSE through WNW in or near drainages leading to SSRAs.  Care needed in selecting units as smoke will likely fumigate along the ground in wind prone areas.  No additional restrictions necessary.

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