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, October 25, 2010       2:35 PM      Jim Little



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

    TUESDAY
The main jet stream is to the south of the region on Monday, cutting across the coastline near San Francisco.  Skies will be mostly cloudy with a chance of a scattered shower or two although most areas should remain dry.  Blustery west-southwest winds will continue.  Mixing heights will climb to 5000 feet or above during the afternoon for good smoke dispersal conditions.
    EXTENDED OUTLOOK (WEDNESDAY - FRIDAY)
A developing upper level low offshore helps build high pressure aloft over the Pacific Northwest.  Subsidence and warming aloft will limit maximum mixing heights somewhat.  Weather should be dry Wednesday and smoke dispersal conditions should be generally fair.  On Thursday the offshore low moves to within about 250 miles of the northern California coast.  Upper level flow backs to southwesterly over the region and warm air aloft should hold maximum mixing heights to near 3000 feet or so but southerly transport winds should help ventilation.  On Friday the upper low slides into California.  Expect a chance of light rain, light southwest transport winds and improving mixing heights.





2.  DISPERSION



TUESDAY



Zone 630 and 632:

Mixing height 3100 - 4100 ft during the morning.  Mixing height rises to above 5000 ft during the afternoon then lowers to 1700 - 2700 ft during the evening.



Transport wind W to NW at 13 - 25 mph.



Surface wind W to NW at 10 - 20 mph during the morning and afternoon.  Surface wind decreases to WSW to WNW at 6 - 12 mph during the evening.



Zone 633 - 638:

Mixing height 3100 - 4100 ft during the morning.  Mixing height rises to above 5000 ft during the afternoon then lowers to 2700 - 3700 ft during the evening.



Transport wind WSW to WNW at 12 - 24 mph throughout the day.



Surface wind WSW to WNW at 10 - 18 mph.



OUTLOOK:



WEDNESDAY

Mixing height below 1000 ft early rising to 1400 to 2400 ft by late morning rising to 3700 to 4700 ft during the afternoon.  Transport wind S to SW at 8 - 14 mph during the morning becoming S to SSW at 18 - 32 mph during the afternoon.  Surface wind SSE to SSW at 6 - 10 mph during the morning becoming SSE to S at 10 - 22 mph during the afternoon.



THURSDAY

Mixing height below 1000 ft early rising to 1000 to 2000 ft by late morning rising to 2500 to 3500 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.



FRIDAY

Mixing height below 1000 ft early rising to 2000 to 3000 ft by late morning rising to 4500 to 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming SSW to WSW at 4 - 8 mph during the afternoon.  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, October 26, 2010.

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



Zone 630 and 632:

Avoid ignitions within 12 miles to the WSW through NW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 20 miles to the S through NW in or near drainages leading to SSRAs.



Zone 633 - 638:

Avoid ignitions within 12 miles to the WSW through WNW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 20 miles to the SSW through WNW in or near drainages leading to 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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