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: Thursday, May 5, 2011       2:35 PM      Pete Parsons



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


FRIDAY


A strengthening westerly jet stream will push another weather system onshore late in the day.  Clouds will be increasing, along with a chance of light showers, mainly over higher terrain.  Temperatures should be near normal with westerly transport winds and fair afternoon mixing.


OUTLOOK (SATURDAY-MONDAY)

As an impressive upper-level trough comes onshore, expect mostly cloudy skies Saturday with rain and snow showers likely by the afternoon.  The snow level will start out near 7000 feet and drop to 5-6000 feet late.  High temperatures will hold near normal.  Afternoon mixing should be good with westerly transport winds.



By Sunday, another unseasonably cold upper-level trough will make camp over the Pacific Northwest.  Rain and snow showers will be numerous with widespread precipitation totals over .10 inches and some areas picking up over .25 inches. The snow level will drop to 4-5000 feet. Surface temperatures will be around 10 degrees below normal, but cooling aloft should maintain good afternoon mixing.  Transport winds will veer to mostly northwesterly.



On Monday, the upper-level trough is forecast to drop southeastward, to over Nevada, with a drier northerly flow aloft developing over Oregon.  Skies will begin to clear, with brisk northerly transport winds.  Cool surface temperatures and some warming aloft will suppress mixing heights slightly with fair smoke dispersion.



2.  DISPERSION



FRIDAY

Mixing height below 1000 ft early rising to 3000 - 4000 ft by late morning.  Afternoon mixing height 3400 - 4400 ft lowering to 1500 - 2500 ft during the evening.



Transport wind WSW to WNW at 9 - 15 mph during the morning and afternoon.  Transport wind decreases to WSW to WNW at 6 - 10 mph during the evening.



Surface wind SW to WNW at 5 - 9 mph.



OUTLOOK:



SATURDAY

Mixing height 2200 to 3200 ft during the morning rising above 5000 ft during the afternoon.  Transport wind WSW to WNW at 7 - 13 mph.  Surface wind light and variable during the morning becoming WSW to NW at 6 - 10 mph during the afternoon.



SUNDAY

Mixing height 2200 to 3200 ft during the morning rising above 5000 ft during the afternoon.  Transport wind W to NW at 9 - 15 mph during the morning becoming NW to NNW at 12 - 22 mph during the afternoon.  Surface wind W to NW at 6 - 10 mph during the morning becoming WNW to NNW at 10 - 20 mph during the afternoon.



MONDAY

Mixing height below 1000 ft early rising to 2300 to 3300 ft by late morning rising to 3300 to 4300 ft during the afternoon.  Transport wind NNW to N at 12 - 24 mph during the morning becoming NNW to NNE at 16 - 30 mph during the afternoon.  Surface wind NW to NNW at 10 - 20 mph.



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 Friday, May 6, 2011.

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



Avoid ignitions within 15 miles to the SW through WNW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 30 miles to the SW through WNW in or near drainages leading to SSRAs.



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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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