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

ODF Smoke Management Instructions smi_south_central at listsmart.osl.state.or.us
Thu Apr 23 14:28:49 PDT 2009


SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS

SALEM FORESTRY WEATHER CENTER

OREGON DEPARTMENT OF FORESTRY



ISSUED: Thursday, April 23, 2009       2:40 PM      Jim Trost



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



Upper trough drifting to the south of the area this afternoon and evening will likely be too weak to bring more than the slightest chance of a few showers.  Clouds decrease overnight and Friday will be mostly sunny and mild.  A ridge is building over the eastern Pacific but it remain far enough west to little impact on mixing.  Mixing height rises to 5000 ft or more during the afternoon.  Transport flow generally northerly with a slight tendency to northeast.  Smoke dispersion should be good through the day, worsening overnight as a nighttime inversion develops.



    OUTLOOK (SATURDAY - MONDAY):



Upper level ridge stationary to the west with northerly flow keeping temperatures fairly cool.  A couple of minor disturbances drop south from Canada but these should be too weak to cause anything more than a few cloudy periods.  Mixing remains good aided by the destabilizing effects of the disturbances.  However, nighttime cooling will result in poor mixing during the night and early morning.  Low-level wind flow mostly northerly tending more northeasterly on Monday.



2.  DISPERSION



FRIDAY

Mixing height above 5000 ft through the afternoon, then lowers to 2500 - 3500 ft during the evening.



Transport wind NNE to ENE at 8 - 12 mph during the morning, and N to NE at 10 - 18 mph in the afternoon and evening.



Surface wind NNW to NNE at 4 - 8 mph during the morning, and WNW to NNW at 8 - 12 mph during the afternoon and evening.



OUTLOOK:



SATURDAY

Mixing height below 1000 ft early, rising to 3700 - 4700 ft by late morning, and above 5000 ft in the afternoon.  Transport wind NW to N at 6 - 12 mph during the morning, becoming WNW to NW at 15 - 29 mph during the afternoon.  Surface wind light and variable, becoming WNW to NW at 12 - 24 mph in the afternoon.



SUNDAY

Mixing height 3200 - 4200 ft during the morning and above 5000 ft in the afternoon.  Transport wind NNW to NNE at 5 - 9 mph.  Surface wind NW to N at 4 - 8 mph.



MONDAY

Mixing height below 1000 ft early, 3300 - 4300 ft in the late morning and above 5000 ft during the afternoon.  Transport wind N to NE at 6 - 12 mph.  Surface wind NNE to ENE at 4 - 8 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 24, 2009.

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



Delay ignitions until 9:00 AM.  Avoid ignitions within 10 miles to the NNW through ENE of SSRAs.  For units that will smolder through the night, avoid burning within at least 18 miles to the NNW through ENE 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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