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, May 12, 2009       2:35 PM      Jim Little

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

The upper trough that brought showers to northeast Oregon moves east on Wednesday and weak high pressure aloft will begin to build cutting off any showers.  A Pacific front moving into western Oregon later Wednesday will spread moisture across the Cascades overnight Wednesday.  Mixing heights should remain favorable for good smoke dispersal conditions and transport winds should be generally southerly.

    OUTLOOK (THURSDAY-SATURDAY):

High pressure aloft builds on Thursday.  Showers are sill possible early in the day but should end as the air mass stabilizes.  Mixing heights should remain favorable for good smoke dispersal however and transport winds will be generally southerly early, becoming westerly later in the day.  Expect continued high pressure aloft on Friday and Saturday for dry weather.  Nighttime inversions will trap residual smoke near the ground but daytime heating should push mixing heights 5000 feet for good smoke dispersal conditions.  Transport winds late in the week will be northwesterly then light and variable.

2.  DISPERSION

WEDNESDAY

Zone 630 and 632:
Mixing height 3700 - 4700 ft during the morning.  Mixing height rises above 5000 ft during the afternoon then lowers below 1000 ft during the evening.

Transport wind SSE to SSW at 10 - 18 mph during the morning.  Transport wind shifts to SSW to SW and increases to 12 - 24 mph during the afternoon then decreases to SSW to SW at 10 - 18 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 4 - 8 mph during the afternoon and evening.

Zone 633 - 638:
Mixing height above 5000 ft during the morning and afternoon.  Mixing height lowers below 1000 ft during the evening.

Transport wind SE to SSW at 10 - 18 mph during the morning.  Transport wind increases to S to SSW at 13 - 25 mph during the afternoon then decreases to SSE to SSW at 10 - 18 mph during the evening.

Surface wind light and variable and controlled by local terrain.

OUTLOOK:

THURSDAY
Mixing height 3300 to 4300 ft during the morning rising above 5000 ft during the afternoon.  In the west transport wind SW to W at 15 - 29 mph.  In the east transport wind SW to W at 10 - 22 mph during the morning becoming W to WNW at 15 - 29 mph during the afternoon.  Surface wind SSW to W at 6 - 10 mph during the morning becoming NW to NNW at 10 - 22 mph during the afternoon.

FRIDAY
Mixing height 3500 to 4500 ft during the morning rising above 5000 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable during the morning becoming NNE to ENE at 4 - 8 mph during the afternoon.

SATURDAY
Mixing height 2800 to 3800 ft during the morning rising above 5000 ft during the afternoon.  Transport wind NE to E at 4 - 8 mph.  Surface wind light and variable during the morning becoming N to NE at 5 - 9 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 Wednesday, May 13, 2009.
    ==================================================================

Zone 630 and 632:
Avoid ignitions within 12 miles to the SE through WSW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 12 miles to the SE through W in or near drainages leading to SSRAs.  Watch for shifting transport winds.  No additional restrictions necessary.  Complete ignitions by 4pm

Zone 633 - 638:
Avoid ignitions within 12 miles to the SE through SW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 12 miles to the SE through W in or near drainages leading to SSRAs.  No additional restrictions necessary.  Complete ignitions by 4pm

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