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

ODF Smoke Management Instructions smi_northeast at listsmart.osl.state.or.us
Tue May 5 14:49:37 PDT 2009


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

ISSUED: Tuesday, May 5, 2009       2:35 PM      Jim Little

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

The main jet stream and storm track remain aimed at the Pacific Northwest on Wednesday.  A surge of moisture from the west-southwest will reach the Oregon coast early in the day and then  spread across the Cascades for periods of light rain.  Mixing heights will be 5000 feet or above during the afternoon for good to excellent smoke dispersal conditions.  Transport winds will be generally southerly early then more southwesterly during the day.

    OUTLOOK (THURSDAY-SATURDAY):

Surface high pressure off the California coast builds northward slowly on Thursday cutting off showers in southern sections.  Mixing heights remain high transport winds will be generally southwesterly through northwesterly.  By Friday the surface high noses into the Pacific Northwest for dry weather.  A thermal trough develops in California and transport winds develop an easterly component.  While weak ridging aloft develops Friday and Saturday there will still be a fairly strong west-to-east flow aloft with minor imbedded impulses.  At this point it looks like dry weather for Saturday, however.  Mixing heights Friday and Saturday will lower somewhat but still be high enough during the afternoons for fair to good smoke dispersal.

2.  DISPERSION

WEDNESDAY

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 SW to WSW at 9 - 15 mph during the morning.  Transport wind increases to WSW to W at 14 - 28 mph during the afternoon then decreases to WSW to WNW at 9 - 15 mph during the evening.

Surface wind S to SW at 8 - 12 mph during the morning.  Surface wind shifts to WNW to NNW at 10 - 16 mph during the afternoon and evening.

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

Transport wind SSW to SW at 8 - 12 mph during the morning.  Transport wind increases to SW to W at 10 - 20 mph during the afternoon then decreases to SW to W at 4 - 8 mph during the evening.

Surface wind SE to S at 5 - 9 mph during the morning.  Surface wind shifts to N to NE at 8 - 12 mph during the afternoon and evening.

OUTLOOK:

THURSDAY
Mixing height 3300 to 4300 ft during the morning rising above 5000 ft during the afternoon.  Transport wind W to NW at 9 - 15 mph during the morning becoming W to NW at 12 - 22 mph during the afternoon.  Surface wind WSW to WNW at 6 - 12 mph during the morning becoming NW to NNW at 12 - 24 mph during the afternoon.

FRIDAY
Mixing height 3000 to 4000 ft during the morning rising above 5000 ft during the afternoon.  Transport wind NNW to NE at 5 - 9 mph during the morning becoming light and variable during the afternoon.  Surface wind NNW to NE at 5 - 9 mph.

SATURDAY
Mixing height 3000 to 4000 ft during the morning rising above 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming NNW to NNE at 5 - 9 mph during the afternoon.  Surface wind light and variable during the morning becoming NNW to NNE 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 Wednesday, May 6, 2009.
    ==================================================================

Zone 630 and 632:
Avoid ignitions within 12 miles to the SW through WNW of SSRAs.  No additional restrictions necessary.  Complete ignitions by 4pm

Zone 633 - 638:
Avoid ignitions within 12 miles to the SSW through W of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 12 miles to the SSW through NW in or near drainages leading to SSRAs.  No additional restrictions necessary.  Complete ignitions by 4pm

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