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

Sun Apr 19 14:13:18 PDT 2009

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

ISSUED: Sunday, April 19, 2009       2:35 PM      Jim Little

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

A broad upper level ridge will continue over the Pacific Northwest Monday.  A weak thermal trough will settle in east of the Cascades.  Surface high pressure will be centered offshore. Mixing heights should be high enough for fair to good smoke dispersal conditions, with some areas having excellent smoke dispersal conditions in Zones 630 and 632.

    OUTLOOK (TUESDAY - THURSDAY)

The upper ridge flattens in response to an upper level low moving across the northern Gulf of Alaska on Tuesday.  Pressure gradients will be quite flat.  Transport winds will be become northwest during the day.  By Wednesday an upper level trough will be approaching, temperatures aloft will be cooling and the atmosphere will be destabilizing for better smoke dispersal condition.  Transport winds will remain generally northwesterly. The trough will still be to the northwest on Thursday with more cooling aloft for better smoke dispersal conditions and transport winds will shift to south to southwesterly.

2.  DISPERSION

MONDAY

Zone 630 and 632:
Mixing height 1800 - 2800 ft during the morning.  Mixing height rises above 5000 ft during the afternoon then lowers below 1000 ft during the evening.

Transport wind light and variable and controlled by local terrain during the morning.  Transport wind increases to WNW to NNW at 4 - 8 mph during the afternoon then shifts and increases to N to NE at 9 - 15 mph during the evening.

Surface wind light and variable and controlled by local terrain during the morning.  Surface wind increases to NNW to NNE at 6 - 10 mph during the afternoon then shifts to WNW to NNW at 4 - 8 mph during the evening.

Zone 633 - 638:
Mixing height 2100 - 3100 ft during the morning.  Afternoon mixing height rises to 2900 - 3900 ft then lowers below 1000 ft during the evening.

Transport wind SE to SSW at 4 - 8 mph throughout the morning and afternoon.  Transport wind shifts to E to SE at 8 - 12 mph during the evening.

Surface wind light and variable and controlled by local terrain during the morning.  Surface wind increases to N to ENE at 4 - 8 mph during the afternoon then becomes light and variable during the evening.

OUTLOOK:

TUESDAY
Mixing height below 1000 ft early rising to 3000 to 4000 ft by late morning rising to 4300 to 5000 ft during the afternoon.  Transport wind SSE to SSW at 6 - 10 mph during the morning becoming W to NW at 8 - 14 mph during the afternoon.  Surface wind light and variable during the morning becoming NNW to NNE at 8 - 14 mph during the afternoon.

WEDNESDAY
Mixing height below 1000 ft early rising to 2000 to 3000 ft by late morning rising to 3500 to 4500 ft during the afternoon.  Transport wind SSW to WSW at 5 - 9 mph during the morning becoming W to NW at 8 - 12 mph during the afternoon.  Surface wind light and variable during the morning becoming WSW to NW at 6 - 10 mph during the afternoon.

THURSDAY
Mixing height below 1000 ft early rising to 3400 to 4400 ft by late morning rising to 4500 to 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming SW to W at 6 - 10 mph during the afternoon.  Surface wind light and variable during the morning becoming SW to W at 5 - 9 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 Monday, April 20, 2009.
    ==================================================================

Zone 630 and 632:
Avoid ignitions within 15 miles in all directions of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 30 miles in all directions of SSRAs.  Recommend against burning units that will smolder significantly overnight.

Zone 633 - 638:
Avoid ignitions within 15 miles to the E through SW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 30 miles to the E through SW in or near drainages leading to SSRAs.  Verify transport winds away from SSRAs if burning in any other direction.  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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