SMI South Central (Smoke Management Instructions) South Central 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       2:40 PM      Pete Parsons



1.  DISCUSSION AND FORECAST FOR SOUTH CENTRAL OREGON ZONES 624 AND 625



    FRIDAY



A strong northwesterly flow aloft will begin to dry things out.  After a few morning rain and snow showers, the air mass should stabilize enough for just partly cloudy conditions in the afternoon.  Brisk northwesterly winds and below normal surface temperatures will continue.  Snow levels will start out near 3500 feet and rise to around 5000 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.  Skies will be partly cloudy with slowly weakening northwesterly flow aloft and onshore flow at the surface.  Early morning mixing will marginal Saturday and poor on Sunday, but daytime heating should good afternoon smoke dispersion both days.  The freezing level will slowly rise to about 8000 feet, by Sunday, with surface temperatures recovering to near normal.  Another strong cold front is forecast to bring an increasing onshore flow Monday, with a chance of showers by Monday evening.



2.  DISPERSION



FRIDAY

Mixing height 3500 - 4500 ft during the morning.  Mixing height rises to above 5000 ft during the afternoon then lowers to 2000 - 3000 ft during the evening.



Transport wind NNW to NNE at 10 - 20 mph.



Surface wind NNW to NNE at 9 - 15 mph during the morning and afternoon.  Surface wind decreases to NW to NNE at 5 - 9 mph during the evening.



OUTLOOK:



SATURDAY

Mixing height below 1000 ft early rising to 3600 - 4600 ft by late morning rising above 5000 ft during the afternoon.  Transport wind WNW to NW at 12 - 22 mph during the morning becoming NW to N at 18 - 30 mph during the afternoon.  Surface wind WNW to NNW at 8 - 14 mph during the morning becoming NW to N at 15 - 25 mph during the afternoon.



SUNDAY

Mixing height below 1000 ft early rising to 3500 - 4500 ft by late morning rising above 5000 ft during the afternoon.  Transport wind NW to N at 9 - 15 mph.  Surface wind NNW to NNE at 6 - 10 mph.



MONDAY

Mixing height below 1000 ft early rising to 3500 - 4500 ft by late morning rising above 5000 ft during the afternoon.  Transport wind WSW to WNW at 9 - 15 mph during the morning becoming WSW to WNW at 15 - 25 mph during the afternoon.  Surface wind WSW to WNW at 6 - 10 mph during the morning becoming WSW to WNW at 10 - 20 mph during the afternoon.



3.  BURNING INSTRUCTIONS FOR ZONES 624 AND 625 INCLUDING THE WALKER

    RANGE PORTION OF ZONE 624

This instruction is valid for burning conducted on Friday, April 30, 2010.

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Avoid ignitions within 10 miles to the NW through NNE of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 15 miles to the W through NNE in or near drainages leading to SSRAs.



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4.  SPECIAL NOTE:



    The smoke management forecaster is available at (503)

    945-7401.  The smoke management forecaster is available

    to discuss specific burns.  The duty forecaster phone

    number is (503) 945-7401. Please call this number and

    not individual's numbers to discuss daily burning. Please

    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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