SMI South Central (Smoke Management Instructions) (no subject)

[ODF Smoke Management Instructions]

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS

SALEM FORESTRY WEATHER CENTER

OREGON DEPARTMENT OF FORESTRY



ISSUED: Wednesday, April 27, 2011       2:40 PM      Jim Little



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

    THURSDAY
An upper level trough on a northeast to southwest axis moves across the region on Thursday.  Weather conditions should be mostly dry but there is still a chance of a few light showers.  Smoke dispersal conditions will be good most areas and transport winds will be generally west-southwesterly.
    EXTENDED OUTLOOK (FRIDAY - SUNDAY)
The upper trough moves east early and a ridge of high pressure is building to the west of Oregon on Friday, although the axis of that ridge will be several hundred miles to the west of the coastline.  South-central Oregon can expect generally dry weather and good smoke dispersal conditions most areas. Transport winds will mostly be from the northwest.
Saturday the ridge builds and its axis moves to about 300 miles west of the coast.  Weather turns dry.  Maximum mixing heights remain high for good smoke dispersal conditions and transport winds will be northwesterly, decreasing during the day.
A broad ridge in the upper atmosphere moves over the region on Sunday for fair weather.  Smoke dispersal conditions should be fair to good and transport winds will be mostly south-southeasterly.

2.  DISPERSION



THURSDAY

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



Transport wind WSW to W at 10 - 22 mph.



Surface wind WSW to WNW at 10 - 16 mph.



OUTLOOK:



FRIDAY

Mixing height above 5000 ft throughout the day.  Transport wind WNW to NW at 14 - 24 mph.  Surface wind W to NW at 10 - 16 mph during the morning becoming NW to NNW at 10 - 22 mph during the afternoon.



SATURDAY

Mixing height below 1000 ft early rising to 2000 - 3000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.



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 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 Thursday, April 28, 2011.

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Avoid ignitions within 10 miles to the SW through WNW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 10 miles to the SW through NW in or near drainages leading to SSRAs.  No additional restrictions necessary.



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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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