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 19, 2011       2:35 PM      Pete Parsons



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


FRIDAY

The strong upper-level trough that brought unseasonably cool and damp conditions earlier this week dropped well southeast of Oregon on Thursday and will rotate northeastward, across the Northern Rockies and into the Northern Plains States, on Friday. Meanwhile, a weak ridge of high pressure is forecast to move onshore Friday morning and slowly drift eastward, to near to Idaho border, by evening.

Skies should be partly cloudy with just a risk of a mountain shower east.   Maximum temperatures should recover to near normal, which will make for good afternoon mixing.  Transport winds will be north-northwesterly.

OUTLOOK (SATURDAY-MONDAY)

On Saturday a weak upper-level trough is forecast to come onshore, along with a surface cold front.  The weakening cold front is forecast to bring increasing clouds and a chance of showers in the afternoon, with west to northwesterly transport winds.  Since the cooler air will not arrive until late in the day, maximum temperatures should be able to climb to near normal.  Expect good daytime mixing.

A moderately strong upper-level trough is forecast to bring mostly cloudy skies and a chance of showers Sunday and Monday.  Temperatures will cool to about 5 degrees below average.  Daytime mixing should be fair to good with northwesterly transport winds turning more north-northwesterly by Monday.


2.  DISPERSION



FRIDAY

Mixing height below 500 ft early rising to 3000 - 4000 ft by late morning.  Afternoon mixing height rises above 5000 ft then lowers to 2000 - 3000 ft during the evening.



Transport wind NNW to NNE at 6 - 10 mph.



Surface wind NNW to NNE at 4 - 8 mph.



OUTLOOK:



SATURDAY

Mixing height below 1000 ft early rising to 3800 to 4800 ft by late morning rising above 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming WNW to NNW at 6 - 10 mph during the afternoon.  Surface wind light and variable during the morning becoming NW to N at 6 - 10 mph during the afternoon.



SUNDAY

Mixing height below 1000 ft early rising to 3000 to 4000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind W to NW at 6 - 10 mph during the morning becoming NW to NNW at 9 - 15 mph during the afternoon.  Surface wind W to NW at 4 - 8 mph during the morning becoming WNW to NNW at 8 - 12 mph during the afternoon.



MONDAY

Mixing height below 1000 ft early rising to 3000 to 4000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind NNW to NNE at 8 - 12 mph.  Surface wind NW to N at 6 - 10 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 20, 2011.

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



Avoid ignitions within 12 miles to the NW through NNE of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 20 miles to the NW through NNE 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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