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

Sun May 2 13:56:31 PDT 2010

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS
SALEM FORESTRY WEATHER CENTER
OREGON DEPARTMENT OF FORESTRY

ISSUED: Sunday, May 2, 2010       2:35 PM      Jim Little

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

    MONDAY

The flat upper ridge that was over the region Sunday gets suppressed as a cold upper trough digs into British Columbia and extends southward into Oregon.  An associated front brings cold and windy conditions to the region with lowering snow levels.  Mixing heights will be high for good smoke dispersal conditions and transport winds will be generally southwesterly ahead of the front shifting to west-northwesterly behind it.

    OUTLOOK (TUESDAY-THURSDAY)

The cold upper trough lies east to west over the region on Tuesday with an upper low closing off in southern Washington by evening.  Precipitation will be limited but morning snow levels will be just 1000 feet ASL. Widely scattered showers continue Wednesday but minor ridging cuts off showers by Thursday.  Temperatures will slowly warm after Tuesday but remain below seasonal average throughout the week.  Mixing heights will be quite high Tuesday through Thursday for good smoke dispersal conditions.

2.  DISPERSION

MONDAY

Zone 630 and 632:
Mixing height above 5000 ft throughout the day.  Mixing height lowers to 3700 - 4700 ft during the evening.

Transport wind SW to W at 25 - 43 mph during the morning.  Transport wind shifts to WNW to NW and decreases to 20 - 34 mph during the afternoon and evening.

Surface wind SW to W at 18 - 32 mph during the morning.  Surface wind shifts to WNW to NW and decreases to 15 - 25 mph during the afternoon and evening.

Zone 633 - 638:
Mixing height near or above 5000 ft throughout the day.

Transport wind SW to WSW at 20 - 34 mph during the morning.  Transport wind shifts to W to NW and decreases to 16 - 30 mph during the afternoon and evening.

Surface wind SW to WSW at 14 - 28 mph during the morning.  Surface wind shifts to W to NW at 13 - 25 mph during the afternoon and evening.

OUTLOOK:

TUESDAY
Mixing height 3300 to 4300 ft during the morning rising to 3900 to 4900 ft during the afternoon.  Transport wind W to WNW at 11 - 21 mph during the morning becoming WNW to NNW at 10 - 22 mph during the afternoon.  Surface wind W to NW at 10 - 16 mph during the morning becoming WNW to NNW at 10 - 18 mph during the afternoon.

WEDNESDAY
Mixing height 3200 to 4200 ft during the morning rising to 4500 to 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming NW to NNW at 8 - 12 mph during the afternoon.  Surface wind WNW to NNW at 6 - 12 mph.

THURSDAY
Mixing height 3200 to 4200 ft during the morning rising to 4500 to 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 Monday, May 3, 2010.
    ==================================================================

Zone 630 and 632:
Avoid ignitions within 10 miles to the SW through NW of SSRAs.  Care needed in selecting units as smoke will likely fumigate along the ground in wind prone areas.  Watch for shifting transport winds.

Zone 633 - 638:
Avoid ignitions within 10 miles to the SW through NW of SSRAs.  Care needed in selecting units as smoke will likely fumigate along the ground in wind prone areas.  Watch for shifting transport winds.

    =========================================================
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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