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: Tuesday, June 22, 2010       2:40 PM      Jim Little

*** Last Forecast/Instructions of 2010 Spring Burning Season ***

It appears that prescribed burning is over for the summer as many areas have declared fire season in effect.  Thus, unless we hear differently, this will be the last forecast for this region for the spring burning season.  If you need specific advice regarding prescribed burning and smoke management during the summer please call the Smoke Management Forecaster Line at 503-945-4701.  Daily forecasts and instructions will resume late summer or early fall depending on weather conditions.


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

    WEDNESDAY

An upper level trough deepens and moves toward the Pacific Northwest on Wednesday.  The trough axis remains offshore for southwesterly flow aloft.  Moisture will be limited but there is a possibility of showers or thunderstorms during the afternoon.  It should be warm enough to push afternoon mixing heights to above 5000 feet for good smoke dispersal conditions.

    OUTLOOK (THURSDAY-SATURDAY)

Thursday sees a westerly flow aloft with embedded disturbances moving with the flow.  Again, very limited moisture so rain is not expected.  Mixing heights should push high enough for good smoke dispersal conditions.  A broad trough aloft sets up for Friday.  Look for dry weather, partly cloudy skies, and good smoke dispersal conditions.  Saturday it's back to a  westerly pattern aloft with weak embedded disturbances but not much moisture.  High afternoon mixing heights will again be the rule on Saturday.


2.  DISPERSION

WEDNESDAY
Mixing height above 5000 ft throughout the day.  Mixing height lowers to 2100 - 3100 ft during the evening.

Transport wind light and variable and controlled by local terrain during the morning.  Transport wind increases to W to NW at 6 - 10 mph during the afternoon then shifts and increases to NNW to N at 13 - 25 mph during the evening.

Surface wind NW to N at 4 - 8 mph during the morning.  Surface wind shifts to W to NW and increases to 8 - 12 mph during the afternoon and evening.

OUTLOOK:

THURSDAY
Mixing height below 1000 ft early rising above 5000 ft by late morning and through the afternoon.  Transport wind NE to E at 6 - 10 mph during the morning becoming N to NE at 4 - 8 mph during the afternoon.  Surface wind S to SW at 6 - 12 mph during the morning becoming SW to WSW at 10 - 22 mph during the afternoon.

FRIDAY
Mixing height 2600 - 3600 ft during the morning rising above 5000 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.

SATURDAY
Mixing height below 1000 ft early rising to 4000 - 5000 ft by late 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 Wednesday, June 23, 2010.
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Avoid ignitions within 10 miles to the WSW through NNE of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 15 miles in all directions of 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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