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, May 23, 2010       2:35 PM      Jim Little

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

   THURSDAY

Weak upper level ridging ahead of an upper low west of the Queen Charlotte Islands will be the main weather feature of the day.  There will be some lingering showers in extreme northeast Oregon otherwise dry weather.  Temperatures should remain mild but below average for the time of year.  Nighttime inversions will keep smoke from smoldering fires close to the ground during the overnight period.  Mixing heights will be quite high during the afternoons, but transport winds will be generally light north-northeasterly.

    OUTLOOK (FRIDAY-SUNDAY)

The ridge strengthens early Tuesday then pushes east by mid day.  Weather will stay dry.  Nighttime inversions continue but daytime mixing heights should be above 5000 feet with a south or south-southeast transport wind for good smoke dispersal conditions.  On Wednesday the upper low elongates north to south with a moist southerly flow increasing over the region.  This will keep showers going into Thursday.  On Thursday the upper low drops southward to off the Oregon coast.  Expect fair to good smoke dispersal conditions throughout the outlook period.

2.  DISPERSION

MONDAY

Zone 630 and 632:
Mixing height above 5000 ft during the morning and afternoon.  Mixing height lowers below 1000 ft during the evening.

Transport wind light and variable and controlled by local terrain.

Surface wind light and variable and controlled by local terrain.

Zone 633 - 638:
Mixing height above 5000 ft during the morning and afternoon.  Mixing height lowers below 1000 ft during the evening.

Transport wind WNW to NNW at 4 - 8 mph during the morning.  Transport wind becomes light and variable and controlled by local terrain during the afternoon and evening.

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

OUTLOOK:

TUESDAY
Mixing height below 1000 ft early rising to 3600 to 4600 ft by late morning rising above 5000 ft during the afternoon.  Transport wind SE to S at 10 - 20 mph.  Surface wind SE to S at 6 - 12 mph during the morning becoming SSE to SW at 4 - 8 mph during the afternoon.

WEDNESDAY
Mixing height 3000 to 4000 ft during the morning rising to 4000 to 5000 ft during the afternoon.  Transport wind SSE to SSW at 8 - 12 mph during the morning becoming SSE to SSW at 10 - 20 mph during the afternoon.  Surface wind SSE to SSW at 6 - 10 mph.

THURSDAY
Mixing height 1500 to 2500 ft during the 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 Monday, May 24, 2010.
    ==================================================================

Zone 630 and 632:
Avoid ignitions within 12 miles in all directions of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 20 miles in all directions of SSRAs.  Complete ignitions by 4:00pm.

Zone 633 - 638:
Avoid ignitions within 12 miles in all directions of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 20 miles in all directions of SSRAs.  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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