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: Sunday, April 25, 2010       2:35 PM      Jim Little

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

    MONDAY

The upper ridge that brought sunshine to much of the state Sunday moves east and an upper trough rotates into the Pacific Northwest during the day.  A surface cold front reaches the coastline during the day.  Expect one more dry day before precipitation moves in on Tuesday.  Models show strong southeasterly to southerly transport winds and high mixing heights for good smoke dispersal conditions.

    OUTLOOK (TUESDAY-THURSDAY)

The upper trough continues on an axis from south of Kodiak, Alaska to northwestern Nevada on Tuesday.  There will be showers during the day. Maximum mixing heights remain generally above 5000 feet for good smoke dispersal conditions. By Wednesday the upper trough splits and a portion moves east.  Minor ridging develops aloft, but not enough to end the showers.  Maximum mixing heights again climb to over 5000 feet for continued good smoke dispersal conditions.  Thursday sees southwesterly flow aloft. A minor disturbance embedded in that flow moves toward the Pacific Northwest but won't reach the area until Thursday.  Look for showers Thursday then a renewed surge of moisture on Friday.  Thursday and Friday maximum mixing heights will be above 5000 feet.

2.  DISPERSION

MONDAY

Zone 630 and 632:
Mixing height above 5000 ft throughout the day.

Transport wind S to SSW at 15 - 25 mph during the morning.  Transport wind increases to SSW to SW at 18 - 32 mph during the afternoon and increases to S to SW at 22 - 38 mph during the evening.

Surface wind S to SSW at 10 - 22 mph throughout the day.

Zone 633 - 638:
Mixing height near or above 5000 ft throughout the day.

Transport wind SE to S at 10 - 22 mph during the morning.  Transport wind increases to SSE to SSW at 14 - 28 mph during the afternoon and evening.

Surface wind SE to S at 10 - 20 mph.

OUTLOOK:

TUESDAY
In the west mixing height 2700 to 3700 ft during the morning rising above 5000 ft during the afternoon.  In the east mixing height 3600 to 4600 ft during the morning rising above 5000 ft during the afternoon.  Transport wind SSW to SW at 13 - 25 mph during the morning becoming SW to W at 10 - 20 mph during the afternoon.  Surface wind S to SW at 10 - 16 mph during the morning becoming SW to W at 8 - 14 mph during the afternoon.

WEDNESDAY
Mixing height 2800 to 3800 ft during the morning rising above 5000 ft during the afternoon.  Transport wind SSE to SW at 6 - 10 mph during the morning becoming W to NW at 5 - 9 mph during the afternoon.  Surface wind SSE to SW at 4 - 8 mph during the morning becoming W to NW at 4 - 8 mph during the afternoon.

THURSDAY
Mixing height 3800 to 4800 ft during the morning rising above 5000 ft during the afternoon.  Transport wind SW to WNW at 4 - 8 mph.  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 Monday, April 26, 2010.
    ==================================================================

Zone 630 and 632:
Avoid ignitions within 10 miles to the S through SW of 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 SE through SSW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 10 miles to the SE through SW 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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