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: Sunday, June 13, 2010       2:40 PM      Jim Little

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

    MONDAY

The upper ridge that brought sunshine to much of Oregon over the weekend moves east on Monday.  Upper flow becomes southwesterly.  Moisture will be limited but expect partly cloudy skies and there is a slight chance of evening thunderstorms.  Cooling aloft will keep afternoon mixing heights quite high for good smoke dispersal conditions.  Transport winds will be generally north or northwesterly.

    OUTLOOK (TUESDAY-THURSDAY)

An upper level low drops down the British Columbia coastline and across northwest Washington during the day Tuesday.  This will increase the southwesterly flow aloft.  Widely scattered afternoon showers are again likely.  High mixing heights will give good smoke dispersal conditions.  The upper level low covers the entire Pacific Northwest by Wednesday, increasing southwesterly flow aloft.  A few afternoon showers or thunderstorms is again a possibility.  Fair to good smoke dispersal conditions.  Thursday will still see an upper level trough over the region, but more sunshine should drive afternoon mixing heights higher for good smoke dispersal conditions.

2.  DISPERSION

MONDAY
Mixing height above 5000 ft throughout the day.  Mixing height lowers to 3700 - 4700 ft during the evening.

Transport wind SSW to SW at 10 - 20 mph during the morning.  Transport wind shifts to WSW to WNW at 12 - 24 mph during the afternoon and evening.

Surface wind SSW to SW at 9 - 15 mph during the morning.  Surface wind shifts to WSW to WNW at 10 - 18 mph during the afternoon then decreases to WSW to NW at 6 - 12 mph during the evening.

OUTLOOK:

TUESDAY
Mixing height below 1000 ft early rising to 1600 - 2600 ft by late morning rising above 5000 ft during the afternoon.  Transport wind N to NE at 4 - 8 mph during the morning becoming W to NW at 8 - 12 mph during the afternoon.  Surface wind light and variable during the morning becoming W to NW at 6 - 10 mph during the afternoon.

WEDNESDAY
Mixing height 3200 - 4200 ft during the morning rising above 5000 ft during the afternoon.  Transport wind WNW to NW at 10 - 16 mph.  Surface wind W to NW at 6 - 10 mph.

THURSDAY
Mixing height below 1000 ft early rising to 4500 - 5000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind SE to SSW at 6 - 12 mph.  Surface wind light and variable.

3.  BURNING INSTRUCTIONS FOR ZONES 624 AND 625 INCLUDING THE WALKER
    RANGE PORTION OF ZONE 624
This instruction is valid for burning conducted on Monday, June 14, 2010.
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Avoid ignitions within 10 miles to the SSW through NW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 15 miles in all directions of SSRAs.  Watch for shifting transport winds.

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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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