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

ODF Smoke Management Instructions smi_northeast at listsmart.osl.state.or.us
Thu Dec 10 14:18:23 PST 2009


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

ISSUED: Thursday, December 10, 2009       2:35 PM      Nick Yonker

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

Cold, northerly flow aloft is gradually slipping to the east as a minor trough and front move up from the southwest.  The trough and front moving in will end the arctic air mass of the past week and usher in more maritime air.  Expect moisture to slowly move up from the south tomorrow bringing a chance of snow or freezing rain Friday night.  Air mass will remain stable with cold air remaining trapped under the warmer air moving in aloft.  Wind flow will start picking up from the south helping to slowly improve smoke dispersion.

    OUTLOOK (SATURDAY - MONDAY):

The trough and front move in early Saturday beginning the warming and destabilization process of the air mass.  Expect mostly rain below 4000 ft except in the northeast corner of the state where snow will continue at most elevations throughout the day.  By Sunday the air mass should be mostly scoured with mixing heights rising to 5000 ft in the afternoon.  Cooler air will move in aloft bringing the snow level down to 2000 - 3000 ft.  An upper ridge will move in on Monday but air mass will remain mostly unstable.

2.  DISPERSION

FRIDAY
Mixing height below 1000 ft during the morning.  Afternoon mixing height rising to 1000 - 1600 ft then rising to 1500 - 2500 ft during the evening.

Transport wind S to SSW at 10 - 18 mph.

Surface wind SSE to SSW at 7 - 12 mph.

OUTLOOK:

SATURDAY
Mixing height 2500 to 3500 ft throughout the day.  Transport wind SSW to SW at 12 - 24 mph.  Surface wind SSE to SW at 7 - 13 mph.

SUNDAY
Mixing height 2200 to 3200 ft during the morning rising to 4500 to 5000 ft during the afternoon.  Transport wind WSW to WNW at 9 - 15 mph.  Surface wind light and variable during the morning becoming WSW to WNW at 8 - 12 mph during the afternoon.

MONDAY
Mixing height 4500 to 5000 ft throughout the day.  Transport wind SSW to WSW at 8 - 12 mph.  Surface wind light and variable during the morning becoming S to SW at 4 - 8 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 Friday, December 11, 2009.
    ==================================================================

Delay ignitions until 10 a.m.  Avoid ignitions within 15 miles to the SSE through SW of SSRAs.

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