SMI South Central (Smoke Management Instructions) South Central Oregon Smoke Management Instructions

[ODF Smoke Management Instructions]

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

ISSUED: Wednesday, April 15, 2009       2:35 PM      Jim Little

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


Thursday will see a weak upper ridge moving slowly eastward over the region.  A weak Pacific cold front will approach the coast during the day but little moisture will make it east of the Cascades.  Transport winds will be southwesterly early, shifting to northerly later.  Smoke dispersal conditions will be generally fair to good.

    OUTLOOK (FRIDAY - SUNDAY):

The weak front spreads clouds to the area Friday, but likely no rain.  Smoke dispersal conditions will be generally fair to good with transport winds mostly south to south-southwest.  A surface high develops over Washington with a thermal low in northern California on Saturday.  The high shifts to the northern Rockies on Sunday while the thermal low shifts to the Cascades.  Expect east to northeast transport winds Saturday then mostly light and variable Sunday.  Mixing heights will decrease and by Sunday smoke dispersal conditions will be poor.

2.  DISPERSION

THURSDAY

Zone 630 and 632:
Mixing height 4100 - 5000 ft during the morning.  Mixing height rises above 5000 ft during the afternoon then lowers below 1000 ft during the evening.

Transport wind NNE to ENE at 6 - 10 mph during the morning.  Transport wind becomes light and variable and controlled by local terrain during the afternoon then increases to NW to N at 5 - 9 mph during the evening.

Surface wind light and variable and controlled by local terrain during the morning.  Surface wind increases to NW to N at 8 - 12 mph during the afternoon then decreases to WNW to NNW at 4 - 8 mph during the evening.

Zone 633 - 638:
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 NNW to N at 10 - 22 mph during the morning.  Transport wind decreases to NW to N at 9 - 15 mph during the afternoon and evening.

Surface wind NW to NNW at 8 - 14 mph during the morning and afternoon.  Surface wind decreases to W to NW at 4 - 8 mph during the evening.

OUTLOOK:

FRIDAY
Mixing height below 1000 ft early rising to 4000 to 5000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind SSW to WSW at 6 - 10 mph during the morning becoming W to NW at 10 - 20 mph during the afternoon.  Surface wind light and variable during the morning becoming NW to N at 8 - 14 mph during the afternoon.

SATURDAY
Mixing height below 1000 ft early rising to 3500 to 4500 ft by late morning rising above 5000 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.

SUNDAY
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 S at 6 - 12 mph.  Surface wind ESE to SSE at 6 - 12 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 Thursday, April 16, 2009.
    ==================================================================

Zone 630 and 632:
Avoid ignitions within 12 miles to the WNW through E of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 20 miles in all directions of SSRAs.

Zone 633 - 638:
Avoid ignitions within 12 miles to the NW through NNE of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 20 miles in all directions of SSRAs.

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