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: Thursday, December 10, 2009       2:40 PM      Nick Yonker

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

Cold, northerly flow aloft is gradually slipping to the east as a minor trough and front move up from the southwest.  The trough and front moving in will end the arctic air mass of the past week and usher in more maritime air.  Expect moisture to slowly move up from the south tomorrow bringing a chance of snow by Friday afternoon.  Air mass will remain stable with cold air remaining trapped under the warmer air moving in aloft.  Wind flow will start picking up from the south helping to improve smoke dispersion.

    OUTLOOK (SATURDAY - MONDAY):

The trough and front move in early Saturday beginning the warming and destabilization process of the air mass.  Expect mostly snow or a snow/rain mix below 5000 ft Saturday afternoon.  By Sunday the air mass should be mostly scoured with mixing heights rising to 5000 ft in the afternoon.  Cooler air will move in aloft bringing the snow level down to the valley floors.  An upper ridge will move in on Monday but air mass will remain mostly unstable.

2.  DISPERSION

FRIDAY

Mixing height below 2000 ft through the morning rising to 1800 - 2500 ft during the afternoon rising to 3500 - 4500 ft during the evening.

Transport wind SSW to SW at 10 - 18 mph during the morning.  Transport wind increases to SSW to SW at 15 - 25 mph during the afternoon and increases to SSW to WSW at 18 - 32 mph during the evening.

Surface wind S to SW at 5 - 9 mph.


OUTLOOK:

SATURDAY
Mixing height 3000 - 4000 ft during the morning rising to 3700 - 4700 ft during the afternoon.  Transport wind SSW to SW at 18 - 30 mph during the morning becoming S to SSW at 12 - 24 mph during the afternoon.  Surface wind S to SW at 8 - 14 mph.

SUNDAY
Mixing height 2200 - 3200 ft during the morning rising to 4500 - 5000 ft during the afternoon.  Transport wind WSW to WNW at 9 - 15 mph.  Surface wind SW to WNW at 5 - 9 mph.

MONDAY
Mixing height 4000 - 5000 ft during the morning and through the afternoon.  Transport wind S to SW at 6 - 10 mph.  Surface wind light and variable during the morning becoming S to SW at 4 - 8 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 Friday, December 11, 2009.
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Delay ignitions until 10 a.m.  Avoid ignitions within 15 miles to the SSW through WSW 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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