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: Saturday, April 18, 2009       2:40 PM      Nick Yonker

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

Upper level ridge is building over the state today with just some variable high clouds running through the ridge.  Ridge will continue building in tonight and tomorrow with clouds dissipating.  Expect a sunny and warm day tomorrow.  Air mass will stabilize with only a brief period of good mixing during maximum heating.  Wind flow will be light and shifting, leading to mostly poor smoke dispersion.

    OUTLOOK (MONDAY - WEDNESDAY):

Upper level ridge continues to build over the state through Monday before weakening and shifting eastward on Tuesday.  Expect Monday to be the warmest day of the period with lowland locations reaching into the upper 70s.  As the ridge shifts eastward on Tuesday, it will open the door for a marine push later Tuesday and Wednesday.  Upper level trough and front move in Wednesday increasing the chance of showers or thundershowers.  Air mass destabilizes Wednesday.  Look for poor to fair smoke dispersion Monday and Tuesday with improving dispersion Wednesday.

2.  DISPERSION

SUNDAY
Mixing height below 1000 ft early rising to 1500 - 2500 ft by late morning.  Afternoon mixing height rises above 5000 ft then lowers below 1000 ft during the evening.

Transport wind ESE to SSE at 6 - 10 mph during the morning.  Transport wind becomes light and variable and controlled by local terrain during the afternoon then increases to NNE to ENE at 5 - 9 mph during the evening.

Surface wind light and variable and controlled by local terrain.

OUTLOOK:

MONDAY
Mixing height below 1000 ft early rising to 2300 - 3300 ft by late morning rising above 5000 ft during the afternoon.  Transport wind ESE to S at 4 - 8 mph during the morning becoming WSW to WNW at 5 - 9 mph during the afternoon.  Surface wind light and variable during the morning becoming SW to W at 5 - 9 mph during the afternoon.

TUESDAY
Mixing height below 1000 ft early rising to 2000 - 3000 ft by late morning rising to 3500 - 4500 ft during the afternoon.  Transport wind SSW to WSW at 5 - 9 mph during the morning becoming W to NW at 6 - 10 mph during the afternoon.  Surface wind light and variable during the morning becoming WSW to NW at 6 - 10 mph during the afternoon.

WEDNESDAY
Mixing height below 1000 ft early rising to 2000 - 3000 ft by late morning rising to 4000 - 5000 ft during the afternoon.  Transport wind SW to WNW at 6 - 10 mph during the morning becoming WSW to WNW at 10 - 20 mph during the afternoon.  Surface wind SW to W at 5 - 9 mph during the morning becoming WSW to WNW at 9 - 15 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 Sunday, April 19, 2009.
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Avoid ignitions within 15 miles in all directions of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 30 miles in all directions of 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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