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, April 29, 2010       2:35 PM      Jim Little



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



    FRIDAY



A strong northwesterly flow aloft will begin to dry things out, but the air mass will remain unstable enough for daytime heating to trigger a few showers, mainly over the mountains.  Brisk northwesterly winds and below normal surface temperatures will continue.  Snow levels will start out near 3500 feet and rise to around 4500 feet in the afternoon.  Maximum mixing heights will rise above 5000 feet for good afternoon smoke dispersal conditions



    OUTLOOK (SATURDAY-MONDAY)



An upper-level ridge will build closer to the coastline Saturday and Sunday, with slowly weakening northwesterly flow aloft and onshore flow at the surface.  There will still be a few afternoon and evening showers on Saturday, but Sunday looks dry.  Early morning mixing will marginal, but daytime heating should provide good afternoon smoke dispersion.  The freezing level will slowly rise to about 7000 feet, by Sunday afternoon, with surface temperatures recovering to near normal.  Another strong cold front is forecast to bring more showers and increasing onshore flow to the region Monday afternoon.  Snow levels will drop to around 4000 feet Monday night.





2.  DISPERSION



FRIDAY



Zone 630 and 632:

Mixing height 3000 - 4000 ft during the morning.  Mixing height rises to above 5000 ft during the afternoon then lowers to 2500 - 3500 ft during the evening.



Transport wind NW to NNW at 10 - 22 mph during the morning.  Transport wind increases to NW to NNW at 14 - 28 mph during the afternoon then decreases to NW to NNW at 12 - 22 mph during the evening.



Surface wind WNW to NNW at 10 - 18 mph during the morning.  Surface wind increases to NW to NNW at 12 - 24 mph during the afternoon then decreases to WNW to NNW at 8 - 12 mph during the evening.



Zone 633 - 638:

Mixing height 3000 - 4000 ft during the morning.  Mixing height rises to above 5000 ft during the afternoon then lowers to 2500 - 3500 ft during the evening.



Transport wind W to NW at 15 - 25 mph during the morning and afternoon.  Transport wind decreases to WNW to NW at 12 - 24 mph during the evening.



Surface wind W to NW at 9 - 15 mph during the morning.  Surface wind increases to WNW to NNW at 12 - 24 mph during the afternoon then decreases to W to NW at 9 - 15 mph during the evening.



OUTLOOK:



SATURDAY

Mixing height 2000 to 3000 ft during the morning rising above 5000 ft during the afternoon.  Transport wind W to WNW at 16 - 26 mph during the morning becoming WNW to NW at 18 - 32 mph during the afternoon.  Surface wind WSW to WNW at 8 - 14 mph during the morning becoming WNW to NW at 12 - 24 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 NW to NNW at 10 - 18 mph.  Surface wind NW to N at 6 - 10 mph.



MONDAY

Mixing height below 1000 ft early rising to 4500 to 5000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind SW to WSW at 15 - 25 mph during the morning becoming WSW to WNW at 20 - 36 mph during the afternoon.  Surface wind SW to WSW at 8 - 12 mph during the morning becoming W to WNW at 15 - 25 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, April 30, 2010.

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



All Zones:

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



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

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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