SMI South Central (Smoke Management Instructions) South Central Smoke Management Instructions

ODF Smoke Management Instructions smi_south_central at listsmart.osl.state.or.us
Thu Apr 9 14:31:08 PDT 2009


SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS
SALEM FORESTRY WEATHER CENTER
OREGON DEPARTMENT OF FORESTRY

ISSUED: Thursday, April 9, 2009       2:40 PM      Nick Yonker

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

Upper level trough will approach tonight and stretch to the south keeping the air mass cool and unstable.  Expect a few lingering showers but mainly over the mountains.  Otherwise look for partly to mostly cloudy skies.  Wind flow will be light onshore but with good mixing, smoke dispersion should be mostly good.

    OUTLOOK (SATURDAY - MONDAY):

Upper level trough weakens and moves to the east Saturday allowing for a minor upper level ridge to build in.  Air mass will warm and dry some.  Next front and trough move in on Easter and promise to bring plenty of moisture to most locations.  Expect fairly breezy conditions as well with this rather strong late season front.  Front moves by to the east later Sunday with the upper trough following on Monday.  Snow level will lower from 6000 - 7000 ft Sunday to the valley floors Monday morning.  Air mass will remain mostly unstable through the period and smoke dispersion good to excellent.

2.  DISPERSION

FRIDAY
Mixing height below 3000 ft early rising above 5000 ft by late morning.

Transport wind light and variable and controlled by local terrain during the morning.  Transport wind increases to W to NW at 6 - 12 mph during the afternoon and evening.

Surface wind light and variable and controlled by local terrain during the morning.  Surface wind increases to W to NW at 6 - 10 mph during the afternoon and evening.

OUTLOOK:

SATURDAY
Mixing height below 1000 ft early rising to 2500 - 3500 ft by late morning rising above 5000 ft during the afternoon.  Transport wind WSW to WNW at 4 - 8 mph during the morning becoming WSW to WNW at 10 - 18 mph during the afternoon.  Surface wind light and variable during the morning becoming WSW to WNW at 8 - 12 mph during the afternoon.

SUNDAY
Mixing height below 1000 ft early rising to 2000 - 3000 ft by late morning rising to 4000 - 5000 ft during the afternoon.  Transport wind S to SW at 12 - 24 mph during the morning becoming SW to WSW at 15 - 25 mph during the afternoon.  Surface wind S to SW at 10 - 16 mph.

MONDAY
Mixing height 4500 - 5000 ft during the morning and through the afternoon.  Transport wind W to WNW at 12 - 24 mph.  Surface wind WSW to WNW at 9 - 15 mph.

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, April 10, 2009.
==================================================================

Avoid ignitions within 10 miles to the W through N of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 15 miles to the W through N in or near drainages leading to SSRAs.

==============================================================
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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