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, April 28, 2009       2:35 PM      Jim Little

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

The upper low that brought clouds, rain and cool temperatures to the Pacific Northwest will track west to east across the state on Wednesday.  This will keep showers going thought the area.  The cool air aloft with this system will keep mixing heights high and smoke dispersal conditions should be good to excellent. Transport winds will generally be northwesterly through westerly.

    OUTLOOK (THURSDAY - SATURDAY):

On Thursday the upper low slowly pulls out to the east allowing weak ridging to build.  Mixing heights should remain high for good to excellent smoke dispersal conditions.  Expect a generally northerly or northwesterly flow across the region.  On Friday a Pacific system approaches Oregon from the southwest.  Computer models differ on the initial intensity of this system as it moves in.  Right now it looks like precipitation will spread across the southern Cascades during the day and work its way northeast.  Precipitation continues Saturday with warm over-running ahead of a Pacific cold front that moves into western Oregon.  Smoke dispersal conditions should be favorable throughout the outlook period, but winds will be light and variable and conditions likely wet.

2.  DISPERSION

WEDNESDAY

Zone 630 and 632:
Mixing height above 5000 ft throughout the day.  Mixing height lowers to 2200 - 3200 ft during the evening.

Transport wind light and variable and controlled by local terrain during the morning.  Transport wind increases to NNW to NNE 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 NW to NNE at 6 - 12 mph during the afternoon and evening.

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

Transport wind NW to N at 6 - 10 mph during the morning.  Transport wind increases to NNW to N at 10 - 22 mph during the afternoon and evening.

Surface wind NW to N at 4 - 8 mph during the morning.  Surface wind increases to NW to NNW at 8 - 12 mph during the afternoon and evening.

OUTLOOK:

THURSDAY
Mixing height 3900 to 4900 ft during the morning rising above 5000 ft during the afternoon.  In the west transport wind NNW to NNE at 4 - 8 mph during the morning becoming NNE to ENE at 5 - 9 mph during the afternoon.  In the east transport wind NW to N at 10 - 16 mph.  Surface wind light and variable during the morning becoming NNW to NNE at 8 - 12 mph during the afternoon.

FRIDAY
Mixing height 3200 to 4200 ft during the morning rising above 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming ENE to ESE at 4 - 8 mph during the afternoon.  Surface wind light and variable during the morning becoming NE to ESE at 5 - 9 mph during the afternoon.

SATURDAY
Mixing height below 1000 ft early rising to 4500 to 5000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind ESE to SSE at 5 - 9 mph.  Surface wind ESE to SSE at 6 - 10 mph.

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, April 29, 2009.
    ==================================================================

Zone 630 and 632:
Avoid ignitions within 10 miles to the WNW through NNE of SSRAs.  No additional restrictions necessary.

Zone 633 - 638:
Avoid ignitions within 10 miles to the NW 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


-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://omls.oregon.gov/pipermail/smi_northeast/attachments/20090428/26f68bd2/attachment.html>