SMI Northeast (Smoke Management Instructions) Northeast Oregon Smoke Management Instructions

[ODF Smoke Management Instructions]

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS

SALEM FORESTRY WEATHER CENTER

OREGON DEPARTMENT OF FORESTRY



ISSUED: Wednesday, November 10, 2010       2:35 PM      Pete Parsons



***Due to the Veterans Day holiday, there will be no smoke forecaster available on Thursday, November 11th and no forecasts will be issued.  Friday's burning instructions will be issued early Friday morning.



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



THURSDAY



A transitory upper-level ridge of high pressure will slide over the region, around midday, and then advance eastward into Idaho.  That will bring a dry day with at least partly sunny skies.  A weak cold front will move onshore in the late afternoon and evening.  Ahead of the front, southerly transport winds will increase in the afternoon.  Warming aloft will suppress mixing heights with only marginal smoke dispersal conditions.


OUTLOOK (FRIDAY-SUNDAY)


A weak cold front will bring a chance of light showers Thursday night through Friday morning, with snow levels near 4000 feet.  Rainfall totals should be around one-tenth of an inch or less, with an inch or two of snow at the higher elevations.  A flat upper-level ridge, in the eastern Gulf of Alaska, will bring a drying and cool northwesterly flow aloft to the region Friday afternoon.  Transport winds will turn more westerly with improved mixing yielding fair smoke dispersal conditions.  A stabilizing air mass will quickly drop mixing heights in the evening.



A broad upper-level ridge will continue to amplify offshore, Saturday and Sunday, with a strong north-northwesterly flow aloft over Oregon.  Skies should stay mostly cloudy with a chance of light rain or snow showers.  The snow level will slowly rise to above 5000 feet.  Warming aloft will suppress mixing heights with marginal to poor smoke dispersal conditions.



2.  DISPERSION



THURSDAY



Zone 630 and 632:

Mixing height below 500 ft early rising to 1000 - 1700 ft by late morning.  Afternoon mixing height rising to 2000 - 3000 ft and remaining the same through the evening.



Transport wind S to SW at 8 - 12 mph during the morning.  Transport wind increases to SW to WSW at 12 - 22 mph during the afternoon and evening.



Surface wind SSE to SSW at 4 - 8 mph throughout the day.



Zone 633 - 638:

Mixing height below 400 ft early rising to 1000 - 1700 ft by late morning.  Afternoon mixing height rising to 1600 - 2600 ft and remaining the same through the evening.



Transport wind SSE to SW at 4 - 8 mph during the morning.  Transport wind increases to SSE to SSW at 9 - 15 mph during the afternoon and evening.



Surface wind light and variable and controlled by local terrain during the morning.  Surface wind increases to SE to SSW at 4 - 8 mph during the afternoon and evening.



OUTLOOK:



FRIDAY

Mixing height 1700 to 2700 ft during the morning rising to 2600 to 3600 ft during the afternoon.  Transport wind W to NW at 8 - 14 mph during the morning becoming NW to N at 6 - 10 mph during the afternoon.  Surface wind WSW to NW at 4 - 8 mph during the morning becoming NW to N at 4 - 8 mph during the afternoon.



SATURDAY

Mixing height below 1000 ft early rising to 1000 to 2000 ft by late morning rising to 2000 to 3000 ft during the afternoon.  Transport wind light and variable during the morning becoming W to NW at 5 - 9 mph during the afternoon.  Surface wind light and variable during the morning becoming WSW to WNW at 4 - 8 mph during the afternoon.



SUNDAY

Mixing height below 1000 ft during the morning rising to 2000 to 3000 ft during the afternoon.  Transport wind light and variable during the morning becoming NW to N at 8 - 12 mph during the afternoon.  Surface wind light and variable during the morning becoming NW to N 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 Thursday, November 11, 2010.

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



Zone 630 and 632:

Delay ignitions until 9 a.m.  Avoid ignitions within 15 miles to the S through WSW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 30 miles to the S through NW in or near drainages leading to SSRAs.  Recommend against burning units that will smolder significantly overnight.



Zone 633 - 638:

Delay ignitions until 9 a.m.  Avoid ignitions within 15 miles to the SSE through WSW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 15 miles to the SSE through NW in or near drainages leading to SSRAs.  Verify transport winds away from SSRAs if burning in any other direction.



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

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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