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: Monday, May 2, 2011       2:40 PM      Jim Little



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



    TUESDAY



The upper trough that brought rain to portions of Oregon on Monday moves east on Tuesday while an upper level ridge builds to the west.  The air aloft will still be cool enough to allow for high afternoon mixing heights and thus good smoke dispersal conditions.  Transport winds will be generally northwesterly.



    OUTLOOK (WEDNESDAY - FRIDAY)



           -- Dry Weather through the Outlook Period --



The upper ridge begins the day Wednesday along the coastline but by evening has drifted eastward to over eastern Washington and Oregon.  Expect light and shifting transport winds, mostly light southeasterly early then light west southwesterly late.  Maximum mixing heights will remain high for good smoke dispersal conditions.



The upper ridge has shifted to over western Montana by Thursday morning and a weak upper trough moves into Washington.  An associated cold front clips northwest Oregon but for this region expect just middle and high clouds.  Temperatures will range 4-6 degrees above average.  The trough does support some instability for good afternoon mixing heights and good smoke dispersal conditions.  Transport winds will be mostly westerly.



Friday an upper low moves down the southeast Alaska/British Columbia coastline.  Mid-level warming with the southwest flow ahead of the low suppresses mixing heights somewhat but smoke dispersal conditions should remain fair to good for most of the region.  Surface temperatures drop to near or slightly below average and transport winds will be mostly southwesterly.





2.  DISPERSION



TUESDAY

Mixing height 2600 - 3600 ft during the morning.  Mixing height rises above 5000 ft during the afternoon then lowers below 1000 ft during the evening.



Transport wind light and variable and controlled by local terrain during the morning.  Transport wind increases to NW to N at 8 - 12 mph during the afternoon and evening.



Surface wind N to NE at 4 - 8 mph during the morning.  Surface wind increases to NNW to NNE at 8 - 12 mph during the afternoon then decreases to N to NE at 4 - 8 mph during the evening.



OUTLOOK:



WEDNESDAY

Mixing height below 1000 ft early rising to 2400 - 3400 ft by late morning rising above 5000 ft during the afternoon.  Transport wind ENE to ESE at 5 - 9 mph during the morning becoming W to NW at 4 - 8 mph during the afternoon.  Surface wind light and variable during the morning becoming W to NW at 4 - 8 mph during the afternoon.



THURSDAY

Mixing height below 1000 ft early rising to 2900 - 3900 ft by late morning rising above 5000 ft during the afternoon.  Transport wind SW to W at 4 - 8 mph.  Surface wind light and variable.



FRIDAY

Mixing height below 1000 ft early rising to 2500 - 3500 ft by late morning rising to 3500 - 4500 ft during the afternoon.  Transport wind SW to W at 4 - 8 mph.  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 Tuesday, May 3, 2011.

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



Avoid ignitions within 15 miles to the NW through NNE of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 30 miles to the NW through ESE in or near drainages leading to SSRAs.  Recommend against burning units that will smolder significantly overnight.



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

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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