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: Sunday, May 1, 2011       2:35 PM      Jim Little



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


    MONDAY

A fairly active cold front reaches the coastline early Monday morning slowly spreading rain eastward across Oregon.  Rain reaches central Oregon mid day and northeast Oregon by late afternoon.  Transport winds will be generally south-southwesterly until the rain arrives when they will shirt to westerly.  Expect good smoke dispersal conditions with maximum mixing heights at 5000 feet or better.

    EXTENDED OUTLOOK (TUESDAY - THURSDAY)

The upper trough associated with Monday's front moves east Tuesday and higher pressure builds offshore.  Look for dry weather and generally northwesterly transport winds. With afternoon mixing heights topping out above 5000 feet smoke dispersal conditions should be good.

The upper ridge axis moves directly over western Oregon Wednesday morning.  For most of northeast Oregon maximum mixing heights will none-the-less remain high and smoke dispersal conditions good.  Expect mostly northwesterly transport winds.

By Thursday a weak upper trough moves over the region as the upper ridge moves east.  Cooler air aloft ensures high maximum mixing heights for good smoke dispersal conditions.  Transport winds will be generally west-southwest to west-northwest.



2.  DISPERSION



MONDAY



Zone 630 and 632:

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



Transport wind SSW to SW at 12 - 24 mph during the morning.  Transport wind shifts to WNW to NW at 14 - 28 mph during the afternoon and evening.



Surface wind SSW to SW at 10 - 18 mph during the morning.  Surface wind shifts to WNW to NW at 12 - 22 mph during the afternoon then decreases to WNW to NNW at 9 - 15 mph during the evening.



Zone 633 - 638:

Mixing height 3700 - 4700 ft during the morning.  Mixing height rises to above 5000 ft during the afternoon then lowers to 1100 - 2100 ft during the evening.



Transport wind SSE to S at 13 - 25 mph during the morning.  Transport wind decreases to S to SW at 8 - 12 mph during the afternoon then shifts to W to NW at 8 - 12 mph during the evening.



Surface wind SE to S at 10 - 20 mph during the morning.  Surface wind shifts to WSW to WNW and decreases to 4 - 8 mph during the afternoon and evening.



OUTLOOK:



TUESDAY

Mixing height 2600 to 3600 ft during the morning rising above 5000 ft during the afternoon.  Transport wind W to NW at 8 - 14 mph.  Surface wind W to NW at 6 - 10 mph.



WEDNESDAY

Mixing height below 1000 ft early rising to 3000 to 4000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming NW to N at 4 - 8 mph during the afternoon.  Surface wind light and variable during the morning becoming WNW to NNW at 4 - 8 mph during the afternoon.



THURSDAY

Mixing height below 1000 ft early rising to 1000 to 2000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming W to NW at 4 - 8 mph during the afternoon.  Surface wind light and variable during the morning becoming W to NW 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 Monday, May 2, 2011.

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



Zone 630 and 632:

Avoid ignitions within 12 miles to the SSW through NW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 20 miles to the SSW through NW in or near drainages leading to SSRAs.  Care needed in selecting units as smoke will likely fumigate along the ground in wind prone areas.  Watch for shifting transport winds.



Zone 633 - 638:

Avoid ignitions within 12 miles to the SE through NW of SSRAs.  Watch for shifting transport winds.  No additional restrictions necessary.  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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