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, May 26, 2010       2:35 PM      Pete Parsons



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


    THURSDAY

A strong upper-level trough will remain over the region with the center of circulation just off the northern California coastline.  That will maintain a moist and unstable southerly flow aloft over Oregon with numerous showers.  Cool air aloft should allow for high mixing heights and good smoke dispersal conditions but may also lead to afternoon and evening thunderstorm development.  Maximum temperatures will remain well below normal.  The snow level will hover around 6000 feet.

    OUTLOOK (FRIDAY-SUNDAY)

The upper-level trough axis is forecast to move over northeastern Oregon Friday morning, before shifting into Idaho Friday evening.  That will maintain considerable shower activity with increasing northwesterly winds ushering drier air, from west to east, across the region during the afternoon and evening.  Maximum temperatures will remain well below normal with the snow level staying near 6000 feet.  Cool air aloft will maintain good daytime smoke dispersal conditions.  A transitory and weak upper-level ridge is forecast to bring mostly dry weather to northeastern Oregon Saturday and Sunday.  Clearing skies will make for chilly overnight periods with inversions forming.  Daytime smoke dispersal conditions will be fair to good with maximum temperatures recovering close to normal by Sunday.


2.  DISPERSION



THURSDAY



Zone 630 and 632:

Mixing height below 1000 ft early rising to 2500 - 3500 ft by late morning.  Afternoon mixing height rises to 4000 - 5000 ft then lowers to 1000 - 2000 ft during the evening.



Transport wind S to SW at 6 - 10 mph during the morning.  Transport wind shifts to WSW to WNW at 4 - 8 mph during the afternoon and evening.



Surface wind light and variable and controlled by local terrain during the morning.  Surface wind increases to WSW to WNW at 4 - 8 mph during the afternoon then becomes light and variable during the evening.



Zone 633 - 638:

Mixing height below 1000 ft early rising to 2500 - 3500 ft by late morning.  Afternoon mixing height rises to 3500 - 4500 ft then lowers below 1000 ft during the evening.



Transport wind WSW to WNW at 8 - 12 mph during the morning.  Transport wind becomes light and variable and controlled by local terrain during the afternoon and evening.



Surface wind light and variable and controlled by local terrain.



OUTLOOK:



FRIDAY

Mixing height below 1000 ft early rising to 3200 to 4200 ft by late morning rising above 5000 ft during the afternoon.  Transport wind WSW to WNW at 8 - 12 mph during the morning becoming WNW to NW at 13 - 25 mph during the afternoon.  Surface wind WSW to NW at 5 - 9 mph during the morning becoming NW to NNW at 10 - 22 mph during the afternoon.



SATURDAY

Mixing height 2000 to 3000 ft during the morning rising above 5000 ft during the afternoon.  Transport wind W to NW at 5 - 9 mph during the morning becoming NW to NNE at 6 - 10 mph during the afternoon.  Surface wind light and variable during the morning becoming NNW to NNE at 4 - 8 mph during the afternoon.



SUNDAY

Mixing height below 1000 ft early rising to 3500 to 4500 ft by late morning rising above 5000 ft during the afternoon.  Transport wind light and variable.  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 Thursday, May 27, 2010.

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



Zone 630 and 632:

Avoid ignitions within 15 miles to the S through NNW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 30 miles to the S through NNW in or near drainages leading to SSRAs.  Verify transport winds away from SSRAs if burning in any other direction.  Watch for shifting transport winds.  Recommend against burning units that will smolder significantly overnight.  Complete ignitions by 5 p.m.



Zone 633 - 638:

Avoid ignitions within 15 miles in all directions of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 30 miles in all directions of SSRAs.  Recommend against burning units that will smolder significantly overnight.  Complete ignitions by 5 p.m.



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

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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