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, May 20, 2010       2:40 PM      Pete Parsons



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


FRIDAY

A cold upper-level trough will remain over the entire Pacific Northwest.  Another cold front will bring increasing showers in the afternoon along with a chance of thunderstorms.  Maximum temperatures will be 10-15 degrees below normal with the snow level dropping to around 4000 feet by late in the day.  High mixing heights will make for good smoke dispersal conditions.

    OUTLOOK (SATURDAY-MONDAY)


An unseasonably cold upper-level trough will set up camp over Oregon Saturday with scattered showers and a chance of afternoon thunderstorms across south-central Oregon.  The snow level will be in the 4-5000 foot range.  The trough will slowly push east Sunday and Monday with a progressively drier, more stable, and warmer northwesterly flow aloft. Temperatures will remain well below normal, with the snow level only lifting to around 6000 feet by Monday.  Showers will taper off by late Monday.  Cool air aloft will maintain high afternoon mixing heights, for good daytime smoke dispersal conditions, after early morning inversions.



2.  DISPERSION



FRIDAY

Mixing height 3500 - 4500 ft during the morning.  Mixing height rises to above 5000 ft during the afternoon then lowers to 3000 - 4000 ft during the evening.



Transport wind SSW to SW at 12 - 24 mph during the morning.  Transport wind shifts to WSW to WNW at 15 - 25 mph during the afternoon and evening.



Surface wind SW to WSW at 10 - 18 mph.



OUTLOOK:



SATURDAY

Mixing height 2800 - 3800 ft during the morning rising above 5000 ft during the afternoon.  Transport wind WSW to WNW at 9 - 15 mph during the morning becoming WNW to NW at 9 - 15 mph during the afternoon.  Surface wind WSW to WNW at 9 - 15 mph.



SUNDAY

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



MONDAY

Mixing height below 1000 ft early rising to 4500 - 5000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind WSW to NW at 5 - 9 mph.  Surface wind W to NW at 4 - 8 mph.



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, May 21, 2010.

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Avoid ignitions within 10 miles to the SSW through WNW of SSRAs.  Care needed in selecting units as smoke will likely fumigate along the ground in wind prone areas.  Watch for shifting transport winds.  No additional restrictions necessary.



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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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