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

Mon Dec 21 15:08:58 PST 2009

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

ISSUED: Monday, December 21, 2009       2:35 PM      Jim Little

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

An upper level low pressure area will be over southeast Oregon and move southeasterly out of the state during the day.  Expect mostly dry conditions as the low exits to the south.  Mixing heights and good transport winds should provide for fair smoke dispersal conditions.

    OUTLOOK (WEDNESDAY-FRIDAY)

On Wednesday a strong upper ridge with its axis about 300 miles west of the coastline will settle in.  This will give a cool north to north-northwest upper flow pattern to the region.  Subsidence with the ridge will lower mixing heights and smoke dispersal conditions will become poor to unfavorable.  The ridge slowly moves east Thursday and Friday but remains to the west of the state.  This will keep conditions dry and stable through at least Christmas.

2.  DISPERSION

TUESDAY

Zone 630 and 632:
Mixing height 1700 - 2700 ft during the morning.  Afternoon mixing height rises to 2500 - 3500 ft then lowers to 1600 - 2600 ft during the evening.

Transport wind WNW to NW at 8 - 12 mph.

Surface wind W to NNW at 6 - 10 mph throughout the day.

Zone 633 - 638:
Mixing height 1100 - 2100 ft during the morning.  Afternoon mixing height rises to 2500 - 3500 ft then lowers to 1200 - 2200 ft during the evening.

Transport wind WSW to NW at 6 - 10 mph throughout the day.

Surface wind WSW to NW at 5 - 9 mph.

OUTLOOK:

WEDNESDAY
Mixing height below 1000 ft during the morning rising to 1500 to 2500 ft during the afternoon.  Transport wind W to NW at 4 - 8 mph during the morning becoming light and variable during the afternoon.  Surface wind light and variable.

THURSDAY
Mixing height below 1000 ft throughout the day.  Transport wind light and variable.  Surface wind light and variable.

FRIDAY
Mixing height below 1000 ft during the morning rising to 1000 to 2000 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 Tuesday, December 22, 2009.
    ==================================================================

Zone 630 and 632:
Avoid ignitions within 12 miles to the W through NNW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 20 miles to the W through NNW in or near drainages leading to SSRAs.

Zone 633 - 638:
Unfavorable burning situation due to very poor smoke dispersion.  Delay ignitions until 11:00am.  Avoid ignitions within 20 miles to the WSW through N of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 35 miles to the WSW through N in or near drainages leading to SSRAs.  Recommend against burning units that will smolder significantly overnight.  Complete ignitions by 3:00pm.

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