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

Sat May 9 14:36:05 PDT 2009

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

ISSUED: Saturday, May 9, 2009       2:35 PM      Nick Yonker

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

Upper level ridge is building over the state today and will be at its peak Sunday morning.  Then it gets shoved eastward by a trough and minor frontal system.  This will set off a marine push over the region Sunday afternoon to evening.  Air mass will be stable during the morning then destabilize well during afternoon heating.  Wind flow will be fairly light during the morning, and then increase from the SW during the afternoon and evening.  Smoke dispersion will improve throughout the day.

    OUTLOOK (MONDAY - WEDNESDAY):

Ridge gives way to an upper trough and front Monday morning.  Most of the moisture will be wrung out west of the Cascades so this front will be mainly dry.  The upper trough will move by to the east Tuesday.  Temperatures will be cool with brisk westerly flow.  Air mass will destabilize quickly Monday and remain unstable through Tuesday.  Weak ridging moves in Wednesday but will be overridden by the next front during the late afternoon and evening.  Expect mostly good to excellent smoke dispersion through the period.

2.  DISPERSION

SUNDAY

Zone 630 and 632:
Mixing height below 1000 ft early rising to 3500 - 4500 ft by late morning.  Afternoon mixing height rises above 5000 ft then lowers to 1000 - 2000 ft during the evening.

Transport wind SSE to SSW at 8 - 12 mph during the morning.  Transport wind shifts to SW to WSW and increases to 10 - 18 mph during the afternoon then increases to SW to WSW at 12 - 24 mph during the evening.

Surface wind light and variable and controlled by local terrain during the morning.  Surface wind increases to SW to W at 6 - 10 mph during the afternoon and evening.

Zone 633 - 638:
Mixing height below 1000 ft early rising to 3500 - 4500 ft by late morning.  Afternoon mixing height rises above 5000 ft then lowers to 1000 - 2000 ft during the evening.

Transport wind SSE to SSW at 4 - 8 mph during the morning.  Transport wind increases to SSE to SSW at 10 - 18 mph during the afternoon and evening.

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

OUTLOOK:

MONDAY
Mixing height below 1000 ft early rising above 5000 ft by late morning and through the afternoon.  Transport wind SW to W at 10 - 20 mph.  Surface wind SW to WNW at 7 - 13 mph during the morning becoming WNW to NW at 12 - 22 mph during the afternoon.

TUESDAY
Mixing height 3800 to 4800 ft during the morning rising above 5000 ft during the afternoon.  Transport wind WSW to WNW at 15 - 30 mph.  Surface wind WSW to WNW at 10 - 20 mph during the morning becoming WNW to NW at 12 - 24 mph during the afternoon.

WEDNESDAY
Mixing height 2500 to 3500 ft during the morning rising to 4000 to 5000 ft during the afternoon.  Transport wind SSE to SSW at 10 - 20 mph during the morning becoming SW to WSW at 12 - 22 mph during the afternoon.  Surface wind SSE to SSW at 6 - 10 mph during the morning becoming WSW to WNW at 10 - 16 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 Sunday, May 10, 2009.
    ==================================================================

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

Zone 633 - 638:
Avoid ignitions within 12 miles to the SSE through SW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 20 miles to the SSE through WNW in or near drainages leading to SSRAs.  Verify transport winds away from SSRAs if burning in any other direction.

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