SMI Northeast (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       2:35 PM      Jim Little



1.  DISCUSSION AND FORECAST FOR NORTHEAST FORECAST AREA ZONES 630-638



    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 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 2-4 degrees above average.  The trough does support some instability for good afternoon mixing heights and good smoke dispersal conditions.  Transport winds will be mostly southwesterly.



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 westerly.



2.  DISPERSION



TUESDAY



Zone 630 and 632:

Mixing height 3900 - 4900 ft during the morning.  Mixing height rises to above 5000 ft during the afternoon then lowers to 1400 - 2400 ft during the evening.



Transport wind WNW to NNW at 6 - 10 mph during the morning.  Transport wind increases to NW to N at 10 - 16 mph during the afternoon and evening.



Surface wind WNW to NNW at 6 - 10 mph during the morning.  Surface wind increases to NW to N at 9 - 15 mph during the afternoon then decreases to NW to NNE at 5 - 9 mph during the evening.

Zone 633 - 638:

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



Transport wind W to NW at 8 - 14 mph throughout the day.



Surface wind W to NW at 8 - 12 mph during the morning and afternoon.  Surface wind becomes light and variable and controlled by local terrain during the evening.



OUTLOOK:



WEDNESDAY

Mixing height below 1000 ft early rising to 2300 to 3300 ft by late morning rising above 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming S to SW at 6 - 10 mph during the afternoon.  Surface wind light and variable during the morning becoming S to SW at 4 - 8 mph during the afternoon.



THURSDAY

Mixing height below 1000 ft early rising to 3800 to 4800 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 to 3500 ft by late morning rising to 3500 to 4500 ft during the afternoon.  Transport wind WSW to WNW at 4 - 8 mph.  Surface wind light and variable.



3.  BURNING INSTRUCTIONS FOR NORTHEAST OREGON ZONES 630-638

    The following considerations should be adhered to in addition to

    the requirements of the Oregon Smoke Management Plan. These

    Instructions are valid for burning conducted on Tuesday, May 3, 2011.

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



Zone 630 and 632:

Avoid ignitions within 12 miles to the WNW through NNE of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 20 miles in all directions of SSRAs.



Zone 633 - 638:

Avoid ignitions within 12 miles to the WSW through NNW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 20 miles in all directions of SSRAs.



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

4.  SPECIAL NOTE:



    The smoke management forecaster is available at (503)-

    945-7401. Please call this number and not individual's

    numbers to discuss daily burning.  For large burns (over

    2000 tons) or burns extending over a considerable period,

    please request a special forecast.  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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