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: Monday, October 12, 2009       2:35 PM      Jim Little

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

A complex upper air situation in progress during the day on Tuesday.  An upper level low will retrograde westward across central British Columbia and a second upper level low will move toward Oregon over the ocean from the southwest.  The two systems will combine for southwesterly flow aloft and a Pacific cold front will spread rain into the region.  Amounts will be significant, greatest since last spring most areas, however the heaviest rains will actually move into northern California.

    OUTLOOK (WEDNESDAY-FRIDAY)

Expect post-frontal showers on Wednesday.  Snow levels should be 7000 feet or above.  Mixing heights should be quite high for good smoke dispersal conditions.  On Thursday a front moves mainly into northwest Oregon and western Washington.  Some light rain should make it east of the Cascades.  By Friday dry weather will return to the area.  Mixing heights should be high enough to allow for fair to good smoke dispersal conditions.

2.  DISPERSION

TUESDAY

Zone 630 and 632:
Mixing height above 5000 ft throughout the day.

Transport wind SSE to SSW at 25 - 45 mph.

Surface wind SSE to SSW at 18 - 30 mph throughout the day.

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

Transport wind SSE to S at 14 - 28 mph during the morning.  Transport wind increases to SE to S at 22 - 38 mph during the afternoon and evening.

Surface wind SSE to S at 12 - 22 mph during the morning.  Surface wind increases to SE to S at 15 - 29 mph during the afternoon and evening.

OUTLOOK:

WEDNESDAY
In the west mixing height 4300 to 5000 ft during the morning rising above 5000 ft during the afternoon.  In the east mixing height 3300 to 4300 ft during the morning rising above 5000 ft during the afternoon.  In the west transport wind SSW to SW at 20 - 34 mph during the morning becoming SW to W at 12 - 22 mph during the afternoon.  In the east transport wind SSW to SW at 16 - 26 mph during the morning becoming SW to WSW at 8 - 14 mph during the afternoon.  Surface wind SSW to SW at 12 - 22 mph during the morning becoming SW to W at 6 - 12 mph during the afternoon.

THURSDAY
Mixing height below 1000 ft early rising to 3000 to 4000 ft by late morning and through the afternoon.  Transport wind light and variable.  Surface wind light and variable.

FRIDAY
Mixing height below 1000 ft early rising to 2000 to 3000 ft by late morning rising to 4000 to 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 Tuesday, October 13, 2009.
    ==================================================================

Zone 630 and 632:
Avoid ignitions within 10 miles to the SSE through SSW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 10 miles to the SSE through SW 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.

Zone 633 - 638:
Avoid ignitions within 10 miles to the SSE through S of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 10 miles to the SSE through SW 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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