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: Tuesday, October 13, 2009       2:35 PM      Jim Little

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

During the day on Wednesday an upper level low consolidates west of southern British Columbia.  Post frontal showers continue through the day.  Mixing heights should be generally favorable for good smoke dispersal.  Transport winds will be generally southwesterly.


    OUTLOOK (THURSDAY-SATURDAY)

The upper low weakens and moves northwest slightly allowing higher pressure to build aloft.  The ridge axis will be over eastern Oregon/eastern Washington.  This will give mostly dry weather to the region.  Mixing heights should still be high enough for fair to good smoke dispersal conditions on Thursday.  The ridge axis shifts slightly east on Friday but dry weather will continue.  By Saturday the remains of a weak front will move through giving a chance of light rain.

2.  DISPERSION

WEDNESDAY

Zone 630 and 632:
Mixing height above 5000 ft throughout the day.  Mixing height lowers to 3900 - 4900 ft during the evening.

Transport wind SSW to SW at 22 - 40 mph during the morning.  Transport wind decreases to WSW to W at 10 - 22 mph during the afternoon and decreases to WSW to WNW at 8 - 14 mph during the evening.

Surface wind SSW to SW at 15 - 29 mph during the morning.  Surface wind decreases to SW to W at 8 - 14 mph during the afternoon then becomes light and variable and controlled by local terrain during the evening.

Zone 633 - 638:
Mixing height 3900 - 4900 ft during the morning.  Mixing height rises above 5000 ft during the afternoon then lowers below 1000 ft during the evening.

Transport wind SSW to SW at 15 - 25 mph during the morning.  Transport wind decreases to SW to W at 9 - 15 mph during the afternoon and decreases to W to NW at 4 - 8 mph during the evening.

Surface wind S to SW at 10 - 20 mph during the morning.  Surface wind shifts to SW to WNW and decreases to 6 - 10 mph during the afternoon then becomes light and variable and controlled by local terrain during the evening.

OUTLOOK:

THURSDAY
In the west mixing height 1700 to 2700 ft during the morning rising above 5000 ft during the afternoon.  In the east mixing height 2300 to 3300 ft during the morning rising to 3400 to 4400 ft during the afternoon.  In the west transport wind SSW to SW at 10 - 20 mph during the morning becoming SSW to SW at 8 - 12 mph during the afternoon.  In the east transport wind SSW to WSW at 6 - 10 mph during the morning becoming light and variable during the afternoon.  Surface wind S to SW at 6 - 10 mph during the morning becoming light and variable during the afternoon.

FRIDAY
Mixing height below 1000 ft early rising to 2000 to 3000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.

SATURDAY
Mixing height below 1000 ft early rising to 1500 to 2500 ft by late morning rising to 3500 to 4500 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 Wednesday, October 14, 2009.
    ==================================================================

Zone 630 and 632:
Avoid ignitions within 10 miles to the SSW through WNW of SSRAs.  Care needed in selecting units as smoke will likely fumigate along the ground in wind prone areas.  No additional restrictions necessary.

Zone 633 - 638:
Avoid ignitions within 12 miles to the S 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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