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: Saturday, May 1, 2010       2:45 PM      Pete Parsons



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



    SUNDAY



An offshore upper-level ridge will build slightly over Oregon with the strong northwesterly flow aloft temporarily weakening.  A warm front will increase the clouds across the region during the. Smoke dispersion should remain fair to good with onshore flow.  Snow levels will rise above 7000 feet.  Surface temperatures should recover close to normal.



    OUTLOOK (MONDAY-WEDNESDAY)



A strong cold front is forecast to bring more rain and blustery winds Monday.  Snow levels will lower to 5000 feet Monday afternoon with brisk onshore winds.  Tuesday looks very cool and unstable with numerous showers and a good chance of afternoon thunderstorms.  The snow level could drop to near 3000 feet. Shower activity will decrease Wednesday, as the air mass slowly begins to warm.  Daytime smoke dispersal should be good.  Cold nighttime temperatures could make for low early morning mixing heights, especially on Wednesday.  Temperatures will be unseasonably cool with strong onshore flow.



2.  DISPERSION



SUNDAY

Mixing height 3000 - 4000 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 NNW to NNE at 9 - 15 mph during the morning.  Transport wind increases to NNW to N at 15 - 25 mph during the afternoon then decreases to NNW to N at 9 - 15 mph during the evening.



Surface wind NNW to NNE at 6 - 12 mph during the morning.  Surface wind increases to NNW to N at 10 - 22 mph during the afternoon then decreases to NNW to N at 8 - 12 mph during the evening.



OUTLOOK:



MONDAY

Mixing height below 1000 ft early rising to 4000 - 5000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind SW to WSW at 10 - 18 mph during the morning becoming W to NW at 22 - 38 mph during the afternoon.  Surface wind SW to WSW at 8 - 14 mph during the morning becoming W to NW at 15 - 25 mph during the afternoon.



TUESDAY

Mixing height 2200 - 3200 ft during the morning rising above 5000 ft during the afternoon.  Transport wind NW to N at 6 - 10 mph during the morning becoming NW to NNW at 12 - 22 mph during the afternoon.  Surface wind NW to N at 5 - 9 mph during the morning becoming NW to N at 9 - 15 mph during the afternoon.



WEDNESDAY

Mixing height below 1000 ft early rising to 3200 - 4200 ft by late morning rising above 5000 ft during the afternoon.  Transport wind NNW to NNE at 9 - 15 mph during the morning becoming NW to NNW at 12 - 22 mph during the afternoon.  Surface wind NNW to NNE at 6 - 12 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 Sunday, May 2, 2010.

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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 NNE in or near drainages leading to SSRAs.  Care needed in selecting units as smoke will likely fumigate along the ground in wind prone areas.



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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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