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: Monday, May 17, 2010       2:40 PM      Jim Little

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

    TUESDAY

Weather maps show a large upper level low in the Gulf of Alaska with counter-clockwise flow around the low giving southerly winds aloft to the region.  There will be enough moisture in this circulation for scattered showers, but afternoon sunbreaks should warm surface temperatures enough to push mixing heights to 5000 feet or above.  Transport winds will be generally west-southwesterly.

    OUTLOOK (WEDNESDAY-FRIDAY)

A vigorous upper level disturbance rotates around the Gulf of Alaska low.  This generates a strong surface low that moves northward off the coastline during the day. Rain from this system crosses the Cascades during the afternoon.  Thus expect dry weather early then significant (for this time of year) rainfall in the afternoon and evening. By Thursday the Gulf low splits and a portion moves to off Vancouver Island.  This will continue to rotate enough moisture into the area for scattered showers through Friday.  Maximum mixing heights should be 5000 feet or above through the outlook period.

2.  DISPERSION

TUESDAY
Mixing height 2600 - 3600 ft during the morning.  Mixing height rises to above 5000 ft during the afternoon then lowers to 4000 - 5000 ft during the evening.

Transport wind SW to W at 10 - 22 mph.

Surface wind SW to W at 10 - 18 mph.

OUTLOOK:

WEDNESDAY
Mixing height below 1000 ft early rising to 3700 - 4700 ft by late morning rising above 5000 ft during the afternoon.  Transport wind SSW to SW at 10 - 22 mph during the morning becoming SW to WSW at 21 - 37 mph during the afternoon.  Surface wind S to SW at 9 - 15 mph during the morning becoming SSW to WSW at 14 - 28 mph during the afternoon.

THURSDAY
Mixing height 3800 - 4800 ft during the morning rising above 5000 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.

FRIDAY
Mixing height 3200 - 4200 ft during the morning rising above 5000 ft during the afternoon.  Transport wind light and variable.  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 Tuesday, May 18, 2010.
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Avoid ignitions within 10 miles to the SW through NW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 15 miles to the SSW through NW in or near drainages leading to SSRAs.

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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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