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

Wed Jun 9 14:20:54 PDT 2010

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS

SALEM FORESTRY WEATHER CENTER

OREGON DEPARTMENT OF FORESTRY

ISSUED: Wednesday, June 9, 2010       2:35 PM      Pete Parsons

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

    THURSDAY

A cool upper-level trough will move over western Oregon in the morning and across eastern Oregon during the afternoon.  Cold air aloft will drop the snow level to 5-6000 feet with widespread shower activity, mainly over higher terrain.  Daytime heating will destabilize the air mass enough for a chance of afternoon thunderstorms.  Temperatures will be well below normal.  Smoke dispersal conditions will be good with high mixing heights and onshore transport winds.  The flow aloft is forecast to slowly turn more northerly overnight, with the air mass stabilizing and drying.  A few showers could linger into Friday morning, especially over the northern mountains.

    OUTLOOK (FRIDAY-SUNDAY)

An upper-level ridge will build just offshore on Friday with the flow aloft drying and turning north-northwesterly.  That will finally put an end to the long stretch of very wet weather with skies clearing and transport winds turning more northerly.  Even with clearing skies, cool air aloft will keep surface temperatures slightly below normal.  The upper-level ridge will move over western Oregon Saturday and eastern Oregon Sunday with transport winds turning offshore and surface temperatures warming to above normal.  Daytime heating should yield high afternoon mixing heights.

2.  DISPERSION

THURSDAY

Mixing height below 2500 ft early rising to 3500 - 4500 ft by late morning.  Afternoon mixing height rises above 5000 ft then lowers to 2200 - 3200 ft during the evening.

Transport wind WSW to WNW at 10 - 18 mph.

Surface wind W to NW at 9 - 15 mph.

OUTLOOK:

FRIDAY

Mixing height 2400 to 3400 ft during the morning rising above 5000 ft during the afternoon.  Transport wind NNW to NNE at 5 - 9 mph during the morning becoming NNW to NNE at 10 - 18 mph during the afternoon.  Surface wind light and variable during the morning becoming NNW to NNE at 8 - 12 mph during the afternoon.

SATURDAY

Mixing height 2800 to 3800 ft during the morning rising above 5000 ft during the afternoon.  Transport wind NNE to ENE at 6 - 10 mph.  Surface wind light and variable.

SUNDAY

Mixing height below 1000 ft early rising to 4500 to 5000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.

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 Thursday, June 10, 2010.

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Avoid ignitions within 10 miles to the WSW through NNW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 15 miles to the WSW 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. 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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