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: Wednesday, November 4, 2009       2:35 PM      Jim Little

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

A very deep upper level low will sit in the northern Gulf of Alaska on Thursday.  This will support a very deep surface low in the same location.  The surface low to the north will give the Pacific Northwest a strong south-to-north pressure gradient for strong south winds through much of Oregon.  A Pacific cold front crosses the Cascades and brings rain to the region overnight Thursday and into Friday.  High mixing heights and good southerly flow will make for good smoke dispersal conditions.

    OUTLOOK (FRIDAY-SUNDAY)

The upper low remains in the northern Gulf of Alaska and a strong upper level jet (120mph) swings around the bottom of the low and into the Pacific Northwest.  Several weather systems will impact the area during the outlook period but none of them appear particularly strong.  Expect showers each day.  Mixing heights will stay high and winds will stay brisk for good smoke dispersal conditions.


2.  DISPERSION

THURSDAY

Zone 630 and 632:
Mixing height 1900 - 2900 ft during the morning.  Mixing height rises to above 5000 ft during the afternoon then lowers to 3300 - 4300 ft during the evening.

Transport wind SSW to SW at 21 - 37 mph during the morning.  Transport wind increases to SSW to SW at 25 - 45 mph during the afternoon and evening.

Surface wind SSW to SW at 12 - 24 mph during the morning.  Surface wind increases to SSW to SW at 15 - 29 mph during the afternoon and evening.

Zone 633 - 638:
Mixing height near or above 5000 ft throughout the day.

Transport wind SSW to SW at 15 - 25 mph during the morning.  Transport wind increases to SSW to SW at 19 - 33 mph during the afternoon and evening.

Surface wind SSW to SW at 10 - 20 mph during the morning.  Surface wind increases to SSW to SW at 13 - 25 mph during the afternoon and evening.

OUTLOOK:

FRIDAY
In the west mixing height above 5000 ft throughout the day.  In the east mixing height 3600 to 4600 ft during the morning rising above 5000 ft during the afternoon.  In the west transport wind SW to WSW at 22 - 40 mph during the morning becoming WSW to W at 16 - 30 mph during the afternoon.  In the east transport wind SW to WSW at 18 - 32 mph during the morning becoming SW to W at 10 - 20 mph during the afternoon.  Surface wind SW to WSW at 15 - 25 mph during the morning becoming SW to W at 10 - 18 mph during the afternoon.

SATURDAY
Mixing height below 1000 ft early rising to 3000 to 4000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind SW to W at 5 - 9 mph.  Surface wind light and variable.

SUNDAY
Mixing height below 1000 ft early rising to 2500 to 3500 ft by late morning rising above 5000 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 Thursday, November 5, 2009.
    ==================================================================

Zone 630 and 632:
Avoid ignitions within 12 miles to the SSW through SW 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 10 miles to the SSW through SW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 10 miles to the SSW through WSW in or near drainages leading to SSRAs.  Care needed in selecting units as smoke will likely fumigate along the ground in wind prone areas.  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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