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 27, 2010       2:35 PM      Pete Parsons



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


    FRIDAY

The offshore upper-level trough, responsible for the cool and damp weather this week, is forecast to finally move over northeastern Oregon by Friday afternoon.  That will maintain considerable shower activity across the region with well below normal temperatures and a 5-6000 foot snow level.  Increasing northwesterly winds will begin to usher drier air, from west to east, across the region late in the day.  Cool air aloft will maintain good daytime smoke dispersal conditions.

    OUTLOOK (SATURDAY-MONDAY)

The trough axis is forecast to shift eastward, to over Idaho, by Saturday morning, with the flow aloft turning northwesterly and beginning to stabilize and dry the air mass.  Some showers will likely linger into Saturday afternoon, mainly over the eastern mountains, with temperatures remaining well below normal.  Clearing skies will make for a cold Saturday night with low-level temperature inversions trapping residual smoke near the surface.  A weak and transitory upper-level ridge will bring partly cloudy to mostly sunny conditions by Sunday afternoon.  Maximum temperatures will recover close to normal with fair to good afternoon smoke dispersal conditions.  The flow aloft will turn southwesterly Monday with fair to good smoke dispersal conditions but also increasing clouds and a chance of showers.


2.  DISPERSION



FRIDAY



Zone 630 and 632:

Mixing height below 1500 ft early rising to 3500 - 4500 ft by late morning.  Afternoon mixing height rises above 5000 ft then lowers to 2500 - 3500 ft during the evening.



Transport wind WNW to NNW at 10 - 18 mph during the morning.  Transport wind increases to NW to NNW at 18 - 30 mph during the afternoon then decreases to WNW to NW at 13 - 25 mph during the evening.



Surface wind NW to NNW at 8 - 14 mph during the morning.  Surface wind increases to NW to NNW at 13 - 25 mph during the afternoon then decreases to WNW to NNW at 10 - 16 mph during the evening.



Zone 633 - 638:

Mixing height below 1500 ft early rising to 3000 - 4000 ft by late morning.  Afternoon mixing height rises above 5000 ft then lowers to 2500 - 3500 ft during the evening.



Transport wind WSW to WNW at 10 - 18 mph during the morning.  Transport wind shifts to NW to NNW and increases to 15 - 25 mph during the afternoon and evening.



Surface wind WSW to WNW at 8 - 14 mph during the morning.  Surface wind increases to NW to NNW at 10 - 20 mph during the afternoon and evening.



OUTLOOK:



SATURDAY

Mixing height 2200 to 3200 ft during the morning rising to 4200 to 5000 ft during the afternoon.  Transport wind WNW to NNW at 10 - 16 mph.  Surface wind WNW to NNW at 5 - 9 mph.



SUNDAY

Mixing height below 1000 ft early rising to 3500 to 4500 ft by late morning rising to 4500 to 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming WSW to WNW at 4 - 8 mph during the afternoon.  Surface wind light and variable during the morning becoming WSW to WNW at 4 - 8 mph during the afternoon.



MONDAY

Mixing height 2800 to 3800 ft during the morning rising to 4500 to 5000 ft during the afternoon.  Transport wind SSW to WSW at 8 - 12 mph during the morning becoming WSW to WNW at 8 - 12 mph during the afternoon.  Surface wind SSW to WSW at 6 - 10 mph during the morning becoming W to NW at 8 - 12 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 Friday, May 28, 2010.

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



Zone 630 and 632:

Avoid ignitions within 10 miles to the WNW through NNW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 15 miles to the WNW through NNW in or near drainages leading to SSRAs.  Care needed in selecting units as smoke will likely fumigate along the ground in wind prone areas.



Zone 633 - 638:

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



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

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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