SMI Northeast (Smoke Management Instructions) Northeast Oregon Smoke Management Instructions

Sat May 1 15:03:19 PDT 2010

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 NORTHEAST FORECAST AREA ZONES 630-638

    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 day with a chance of light rain late. Smoke dispersion should remain fair to good with onshore flow.  Snow levels will rise above 6000 feet.  Surface temperatures should recover close to normal.

    OUTLOOK (MONDAY-WEDNESDAY)

A strong cold front is forecast to bring more rain, mountain snow, and blustery winds Monday.  Snow levels will lower to 4000 feet Monday afternoon with brisk onshore winds.  Tuesday looks very cool and unstable with numerous showers and a good chance of afternoon thunderstorms.  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.  The snow level could drop below 3000 feet on Tuesday.

2.  DISPERSION

SUNDAY

Mixing height 3500 - 4500 ft during the morning.  Mixing height rises above 5000 ft during the afternoon then lowers to 3800 - 4800 ft during the evening.

Transport wind WSW to NW at 6 - 10 mph during the morning.  Transport wind increases to W to NW at 12 - 20 mph during the afternoon and evening.

Surface wind WSW to NW at 6 - 10 mph during the morning.  Surface wind increases to W to NW at 10 - 18 mph during the afternoon and evening.

OUTLOOK:

MONDAY

Mixing height 3400 to 4400 ft during the morning rising above 5000 ft during the afternoon.  Transport wind SW to WSW at 21 - 37 mph during the morning becoming W to WNW at 24 - 42 mph during the afternoon.  Surface wind SW to W at 10 - 22 mph during the morning becoming W to WNW at 16 - 30 mph during the afternoon.

TUESDAY

Mixing height 3800 to 4800 ft during the morning rising above 5000 ft during the afternoon.  Transport wind WSW to WNW at 12 - 22 mph.  Surface wind W to NW at 5 - 9 mph during the morning becoming WNW to NW at 9 - 15 mph during the afternoon.

WEDNESDAY

Mixing height below 1000 ft early rising to 4500 to 5000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind WNW to NNW at 9 - 15 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.

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 Sunday, May 2, 2010.

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Avoid ignitions within 10 miles to the SW through NW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 10 miles to the SSW through NW in or near drainages leading to SSRAs.  No additional restrictions necessary.

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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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