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: Tuesday, April 27, 2010       2:40 PM      Jim Little

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

    WEDNESDAY

A cold upper-level trough will move over Oregon with west-southwesterly flow aloft.  Snow levels will drop to between 3500 and 4000 feet with frequent showers.  Surface temperatures will be well below normal.  The air mass will be quite unstable, and maximum mixing heights will go above 5000 feet for good smoke dispersal conditions.

    OUTLOOK (THURSDAY-SATURDAY)

The strong upper-level trough will slowly progress eastward with the flow aloft becoming northwesterly.  The air mass will remain unstable enough for daytime heating to enhance the shower activity Thursday afternoon.  The air aloft may warm enough to shut down the shower activity Friday and Saturday, with the upper-level winds turning northerly.  Snow levels will start out near 4000 feet on Thursday...rising to between 4000 and 5000 feet Friday and above 5000 feet on Saturday.  Maximum mixing heights should reach 5000 feet plus throughout the outlook period for good smoke dispersal conditions.

2.  DISPERSION

WEDNESDAY
Mixing height 2800 - 3800 ft during the morning.  Mixing height rises to above 5000 ft during the afternoon then lowers to 2500 - 3500 ft during the evening.

Transport wind SW to W at 10 - 20 mph during the morning.  Transport wind shifts to WNW to NW at 10 - 22 mph during the afternoon and evening.

Surface wind SW to W at 9 - 15 mph during the morning.  Surface wind shifts to W to NW at 10 - 18 mph during the afternoon and evening.

OUTLOOK:

THURSDAY
Mixing height 3900 - 4900 ft during the morning rising above 5000 ft during the afternoon.  Transport wind W to NW at 16 - 26 mph.  Surface wind W to NW at 10 - 16 mph during the morning becoming NW to NNW at 10 - 22 mph during the afternoon.

FRIDAY
Mixing height 3200 - 4200 ft during the morning rising above 5000 ft during the afternoon.  Transport wind WNW to NNW at 9 - 15 mph.  Surface wind NW to N at 6 - 10 mph.

SATURDAY
Mixing height below 1000 ft early rising to 4500 - 5000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind NNW to NNE at 9 - 15 mph.  Surface wind NNW to NNE at 6 - 10 mph.

3.  BURNING INSTRUCTIONS FOR ZONES 624 AND 625 INCLUDING THE WALKER
    RANGE PORTION OF ZONE 624
This instruction is valid for burning conducted on Wednesday, April 28, 2010.
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Avoid ignitions within 12 miles to the SW through NW of SSRAs.  Watch for shifting transport winds.  No additional restrictions necessary.

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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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