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

Tue Apr 27 15:48:51 PDT 2010

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

ISSUED: Tuesday, April 27, 2010       2:35 PM      Jim Little

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

    WEDNESDAY

A cold upper-level trough will move over Oregon with west-southwesterly flow aloft.  Snow levels will drop to around 4000 feet with frequent showers.  Surface temperatures will be well below normal.  The air mass will be quite unstable, and maximum mixing heights will go above 5000 feet for good smoke dispersal conditions.

    OUTLOOK (THURSDAY-SATURDAY)

The strong upper-level trough will slowly progress eastward with the flow aloft becoming northwesterly.  The air mass will remain unstable enough for daytime heating to enhance the shower activity in the afternoons and evenings Thursday and Friday.  The air aloft may warm enough by Saturday to shut down the shower activity.  Snow levels will start out near 4000 feet on Thursday...rising to between 4000 and 5000 feet Friday and above 5000 feet on Saturday.  Maximum mixing heights should reach 5000 feet plus throughout the outlook period for good smoke dispersal conditions.

2.  DISPERSION

WEDNESDAY

Zone 630 and 632:
Mixing height above 5000 ft throughout the day.  Mixing height lowers to 2400 - 3400 ft during the evening.

Transport wind WSW to WNW at 8 - 14 mph during the morning.  Transport wind increases to WNW to NW at 14 - 28 mph during the afternoon and evening.

Surface wind WSW to WNW at 6 - 12 mph during the morning.  Surface wind increases to WNW to NW at 10 - 18 mph during the afternoon and evening.

Zone 633 - 638:
Mixing height above 5000 ft throughout the day.  Mixing height lowers to 2300 - 3300 ft during the evening.

Transport wind WSW to WNW at 10 - 16 mph throughout the day.

Surface wind SW to W at 8 - 14 mph.

OUTLOOK:

THURSDAY
Mixing height 3500 to 4500 ft during the morning rising above 5000 ft during the afternoon.  Transport wind W to NW at 16 - 30 mph during the morning becoming WNW to NW at 20 - 36 mph during the afternoon.  Surface wind W to NW at 10 - 22 mph during the morning becoming WNW to NW at 14 - 28 mph during the afternoon.

FRIDAY
Mixing height 3200 to 4200 ft during the morning rising above 5000 ft during the afternoon.  Transport wind NW to NNW at 15 - 25 mph during the morning becoming NW to N at 10 - 20 mph during the afternoon.  Surface wind NW to NNW at 9 - 15 mph.

SATURDAY
Mixing height 2600 to 3600 ft during the morning rising above 5000 ft during the afternoon.  Transport wind NW to N at 9 - 15 mph.  Surface wind NW to N at 6 - 10 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 Wednesday, April 28, 2010.
    ==================================================================

Zone 630 and 632:
Avoid ignitions within 10 miles to the WSW through NW of SSRAs.  No additional restrictions necessary.

Zone 633 - 638:
Avoid ignitions within 10 miles to the SW through NW of 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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