SMI Northeast (Smoke Management Instructions) Northeast Oregon Smoke Management Instructions

Sun Apr 18 14:29:12 PDT 2010

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS
SALEM FORESTRY WEATHER CENTER
OREGON DEPARTMENT OF FORESTRY

ISSUED: Sunday, April 18, 2010       2:35 PM      Jim Little

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

Upper air charts show a major trough in the eastern Pacific on Monday.  Flow aloft over the region is southerly ahead of a slow moving Pacific cold front.  Any rain from this system will hold off until Tuesday.  Mixing heights support good to very good smoke dispersal conditions.

    OUTLOOK (TUESDAY-THURSDAY)

On Tuesday the upper trough slowly moves through the region, eventually splitting with the southern portion becoming a closed upper low over California.  Showers move in during the morning hours and continue throughout the day.  Transport winds will be variable becoming northwesterly during the day.  Expect good smoke dispersal conditions.  On Wednesday the upper low drifts across southern Nevada.  Flow aloft will be light and variable but brisk northwesterly transport winds are likely closer to the ground.  On Thursday weak ridging develops over the eastern Pacific Ocean.  Flow aloft will be from the north or northwest, and while there will still be a few showers around expect a drying trend during the day.  Smoke dispersal conditions should be good.

2.  DISPERSION

MONDAY

Zone 630 and 632:
Mixing height 1900 - 2900 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 8 - 12 mph throughout the morning and afternoon.  Transport wind shifts to N to ENE at 6 - 10 mph during the evening.

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

Zone 633 - 638:
Mixing height 3300 - 4300 ft during the morning.  Mixing height rises to above 5000 ft during the afternoon then lowers to 2800 - 3800 ft during the evening.

Transport wind SE to S at 10 - 20 mph during the morning.  Transport wind decreases to SSE to SSW at 6 - 12 mph during the afternoon and evening.

Surface wind SE to S at 9 - 15 mph during the morning.  Surface wind decreases to SSE to SSW at 6 - 10 mph during the afternoon then shifts to E to SE at 4 - 8 mph during the evening.

OUTLOOK:

TUESDAY
In the west mixing height 2800 to 3800 ft during the morning lowering to 2000 to 3000 ft during the afternoon.  In the east mixing height 3500 to 4500 ft during the morning lowering to 1400 to 2400 ft during the afternoon.  In the west transport wind SSW to SW at 16 - 30 mph during the morning becoming W to NW at 9 - 15 mph during the afternoon.  In the east transport wind SSW to WSW at 9 - 15 mph during the morning becoming WNW to NNW at 8 - 14 mph during the afternoon.  In the west surface wind S to SW at 10 - 20 mph during the morning becoming W to NW at 8 - 12 mph during the afternoon.  In the east surface wind SSW to WSW at 6 - 10 mph during the morning becoming WNW to NNW at 6 - 12 mph during the afternoon.

WEDNESDAY
Mixing height 1600 to 2600 ft during the morning rising to 3500 to 4500 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.

THURSDAY
Mixing height 2200 to 3200 ft during the morning rising to 4000 to 5000 ft during the afternoon.  Transport wind NW to N at 4 - 8 mph.  Surface wind NW to N at 4 - 8 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 Monday, April 19, 2010.
    ==================================================================

Zone 630 and 632:
Avoid ignitions within 15 miles in all directions of SSRAs.  Watch for shifting transport winds.

Zone 633 - 638:
Avoid ignitions within 12 miles to the ESE through SSW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 12 miles to the ESE through W in or near drainages leading to SSRAs.  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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