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

[ODF Smoke Management Instructions]

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

ISSUED: Sunday, May 9, 2010       2:35 PM      Jim Little

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

MONDAY

An upper level low moves into SW Oregon/Northern California during the day.  This will produce showers throughout the region with heaviest amounts in southern zones.  The air mass will be cool and snow is possible above 4500 feet ASL.  Mixing heights will be fairly high for fair to good smoke dispersal conditions.

    OUTLOOK (TUESDAY-THURSDAY)

High pressure aloft develops offshore with the upper low tracking across Nevada and Utah on Tuesday.  Showers should decrease rapidly during the day.  By Wednesday a thermal trough is well established in central California for a generally northerly transport wind. Also by Wednesday the upper ridge moves over the area and will dominate area weather for Wednesday and Thursday with dry weather likely. Sunshine and daytime heating will help keep maximum mixing heights high throughout the outlook period but the clear skies will aid radiational cooling for nighttime inversions and very low mixing conditions during the overnight period.


2.  DISPERSION

MONDAY
Mixing height 1000 - 2000 ft during the morning.  Afternoon mixing height rises to 3500 - 4500 ft then lowers to 1700 - 2700 ft during the evening.

Transport wind light and variable and controlled by local terrain during the morning.  Transport wind increases to NW to N at 6 - 10 mph during the afternoon and increases to NW to N at 8 - 16 mph during the evening.

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

OUTLOOK:

TUESDAY
In the west mixing height 2100 to 3100 ft during the morning rising above 5000 ft during the afternoon.  In the east mixing height 1400 to 2400 ft during the morning rising above 5000 ft during the afternoon.  In the west transport wind NW to NNW at 12 - 24 mph.  In the east transport wind NW to N at 8 - 14 mph during the morning becoming NNW to N at 10 - 22 mph during the afternoon.  Surface wind NW to N at 8 - 14 mph during the morning becoming NNW to N at 10 - 22 mph during the afternoon.

WEDNESDAY
Mixing height below 1000 ft early rising to 4000 to 5000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind NNW to NNE at 6 - 10 mph.  Surface wind light and variable during the morning becoming N to NE at 4 - 8 mph during the afternoon.

THURSDAY
Mixing height below 1000 ft early rising to 4500 to 5000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind E to SE at 4 - 8 mph.  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 Monday, May 10, 2010.
    ==================================================================

Avoid ignitions within 12 miles to the WSW through N 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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