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

[ODF Smoke Management Instructions]

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

ISSUED: Friday, May 29, 2009       2:40 PM      Nick Yonker

****Due to minimal burning and the region going into fire season, this will be the last written forecast and instruction for the spring burning season.  Please let us know if you continue to need written forecasts.  Otherwise, we're available from 7 a.m. to 5 p.m. at 503-945-7401 to provide verbal instructions to any of your burning needs.****

1.  DISCUSSION AND FORECAST FOR SOUTH CENTRAL OREGON ZONES 624 AND 625

Upper level ridge will remain in place through Saturday with the axis of the ridge near the Oregon/Idaho border.  Expect continued summer-like weather.  Air mass will remain stable except for brief afternoon instability inland due to daytime heating.  Like the last couple of days, thunderstorm buildups will continue in the afternoon to evening.  Wind flow will remain weak and favor generally a NW flow.  Smoke dispersion will remain poor to fair.

    OUTLOOK (SUNDAY - TUESDAY):

Upper level ridge starts weakening on Sunday as a trough moves down from the north and an upper low approaches from the southwest.  However, expect continued warm and dry conditions.  Thundershower threat will continue but diminish somewhat.  Eventually the upper level low in the eastern Pacific and to the southwest of the state will move close enough to bring increased clouds and maybe some moisture over the region on Tuesday.  Wind flow will remain light and mostly northerly Sunday and Monday.  As the low approaches Tuesday, wind flow appears it will turn lightly offshore.  Smoke dispersion will remain poor to fair.

2.  DISPERSION

SATURDAY
Mixing height below 1000 ft early rising to 3200 - 4200 ft by late morning.  Afternoon mixing height rises above 5000 ft then lowers below 1000 ft during the evening.

Transport wind light and variable and controlled by local terrain during the morning.  Transport wind increases to WNW to NNW at 9 - 15 mph during the afternoon and evening.

Surface wind light and variable and controlled by local terrain during the morning.  Surface wind increases to WSW to WNW at 8 - 12 mph during the afternoon and evening.

OUTLOOK:

SUNDAY
Mixing height below 1000 ft early rising to 3200 - 4200 ft by late morning rising above 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming NW to N at 8 - 12 mph during the afternoon.  Surface wind light and variable during the morning becoming W to NW at 6 - 12 mph during the afternoon.

MONDAY
Mixing height below 1000 ft early rising to 3500 - 4500 ft by late morning rising above 5000 ft during the afternoon.  Transport wind N to NE at 5 - 9 mph.  Surface wind light and variable during the morning becoming NW to N at 6 - 10 mph during the afternoon.

TUESDAY
Mixing height below 1000 ft early rising to 3000 - 4000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind NE to E at 8 - 12 mph during the morning becoming NNW to NNE at 6 - 10 mph during the afternoon.  Surface wind light and variable during the morning becoming NW to NNE at 5 - 9 mph during the afternoon.

3.  BURNING INSTRUCTIONS FOR ZONES 624 AND 625 INCLUDING THE WALKER
    RANGE PORTION OF ZONE 624
This instruction is valid for burning conducted on Saturday, May 30, 2009.
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Avoid ignitions within 15 miles to the WNW through E of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 30 miles to the WNW through E in or near drainages leading to SSRAs.  Recommend against burning units that will smolder significantly overnight.

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4.  SPECIAL NOTE:

    The smoke management forecaster is available at (503)
    945-7401.  The smoke management forecaster is available
    to discuss specific burns.  The duty forecaster phone
    number is (503) 945-7401. Please call this number and
    not individual's numbers to discuss daily burning. Please
    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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