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, April 25, 2011       2:35 PM      Jim Little



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



    TUESDAY



Upper troughiness slowly gives way to weak ridging aloft during the day on Tuesday.  Only limited moisture is available but I can't rule out the possibility of some light rain during the day.  Mixing heights will be at 5000 feet or better during the afternoon for good smoke dispersal conditions while transport winds will be southwesterly most areas.



    OUTLOOK (WEDNESDAY - FRIDAY)



The weak ridging moves east during the day on Wednesday as an upper low moves across the southern Gulf of Alaska toward Vancouver Island.  It will be generally dry except for a chance for some showers in the northeast mountains.  Mixing heights remain high for good smoke dispersal conditions and transport winds should be mostly south to southwest.



The upper low drifts across southern British Columbia on Thursday and another surge of moisture moves in for renewed precipitation.  Much cooler aloft will push mixing heights to above 5000 feet and brisk southwesterly transport winds will be the rule.  This should give continued good smoke dispersal conditions.  On Friday post frontal showers continue with transport winds becoming westerly and diminishing.  Upper level ridging is beginning to build and shift over the area from the west and should lead to dry weather for the weekend.  Mixing heights max out at 5000 feet or above and westerly transport winds indicate good smoke dispersal conditions for Friday.



2.  DISPERSION



TUESDAY



Zone 630 and 632:

Mixing height 2900 - 3900 ft during the morning.  Mixing height rises above 5000 ft during the afternoon then lowers below 1000 ft during the evening.



Transport wind W to NW at 10 - 18 mph during the morning.  Transport wind decreases to WNW to NNW at 6 - 10 mph during the afternoon then becomes light and variable and controlled by local terrain during the evening.



Surface wind W to NW at 8 - 14 mph during the morning.  Surface wind decreases to WNW to NNW at 5 - 9 mph during the afternoon then becomes light and variable and controlled by local terrain during the evening.

Zone 633 - 638:

Mixing height 3200 - 4200 ft during the morning.  Mixing height rises above 5000 ft during the afternoon then lowers below 1000 ft during the evening.



Transport wind WSW to WNW at 10 - 18 mph during the morning.  Transport wind decreases to WSW to WNW at 6 - 12 mph during the afternoon then becomes light and variable and controlled by local terrain during the evening.



Surface wind WSW to WNW at 9 - 15 mph during the morning.  Surface wind decreases to WSW to WNW at 6 - 10 mph during the afternoon then becomes light and variable and controlled by local terrain during the evening.



OUTLOOK:



WEDNESDAY

In the west mixing height 2600 to 3600 ft during the morning rising above 5000 ft during the afternoon.  In the east mixing height 3700 to 4700 ft during the morning rising above 5000 ft during the afternoon.  Transport wind SSE to SSW at 10 - 20 mph during the morning becoming SSW to WSW at 10 - 18 mph during the afternoon.  Surface wind SSE to SSW at 6 - 12 mph during the morning becoming SSW to WSW at 8 - 12 mph during the afternoon.



THURSDAY

Mixing height 2500 to 3500 ft during the morning rising above 5000 ft during the afternoon.  Transport wind WSW to WNW at 4 - 8 mph.  Surface wind WSW to WNW at 4 - 8 mph.



FRIDAY

Mixing height 3400 to 4400 ft during the morning rising above 5000 ft during the afternoon.  Transport wind W to NW at 4 - 8 mph during the morning becoming light and variable during the afternoon.  Surface wind light and variable during the morning becoming WNW to NNW at 4 - 8 mph during the afternoon.



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, April 26, 2011.

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



Zone 630 and 632:

Avoid ignitions within 15 miles to the WSW through NE of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 15 miles in all directions of SSRAs.  Complete ignitions by 4:00pm.



Zone 633 - 638:

Avoid ignitions within 15 miles to the SSW through NW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 15 miles in all directions of SSRAs.  Complete ignitions by 4:00pm.



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



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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