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

[ODF Smoke Management Instructions]

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

ISSUED: Friday, December 11, 2009       2:35 PM      Nick Yonker

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

Upper level low off the northern California coast is lifting a warm front into the region this afternoon.  Moisture has started over the southern part of the state and will slowly move northward this evening and into early tomorrow.  Low level cold air will be slow to retreat with likely a period of light snow and/or freezing rain.  Eventually, the snow level will rise to near 4000 ft Saturday afternoon.  Air mass will destabilize first down south then slowly scour to the north.  Expect continued stable conditions and poor to fair smoke dispersion through most of Saturday.

    OUTLOOK (SUNDAY - TUESDAY):

The upper trough to the south will gradually combine with the cold trough to the north bringing more showers on Sunday.  Snow level will lower to 2000 - 3000 ft.  Most lowland areas will scour out of the cold air.  Minor ridge builds in briefly Monday but this will quickly be overrun by the next frontal system coming in from the west.  Look for increasing rain or snow Monday afternoon with the snow level lifting to 4000 - 5000 ft.  Moist and blustery conditions continue into Tuesday under strong SW flow aloft.  Expect generally good mixing and smoke dispersion through the period.

2.  DISPERSION

SATURDAY
Mixing height below 1000 ft early rising to 2500 - 3500 ft by late morning.  Afternoon and evening mixing height similar to late morning.

Transport wind SSW to SW at 10 - 20 mph.

Surface wind S to SW at 7 - 12 mph.

OUTLOOK:

SUNDAY
Mixing height 3300 to 4300 ft during the morning rising above 5000 ft during the afternoon.  Transport wind SW to W at 10 - 20 mph during the morning becoming W to WNW at 15 - 25 mph during the afternoon.  Surface wind SSW to WSW at 7 - 11 mph during the morning becoming W to NW at 10 - 18 mph during the afternoon.

MONDAY
Mixing height 3200 to 4200 ft during the morning rising above 5000 ft during the afternoon.  Transport wind SSW to WSW at 8 - 12 mph during the morning becoming SE to SSW at 10 - 16 mph during the afternoon.  Surface wind light and variable during the morning becoming SE to S at 5 - 9 mph during the afternoon.

TUESDAY
Mixing height 3500 to 4500 ft during the morning rising above 5000 ft during the afternoon.  Transport wind SSE to SSW at 15 - 25 mph.  Surface wind SSE to SSW at 9 - 15 mph.

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 Saturday and Sunday, December 12 and 13, 2009.
    ==================================================================

For Saturday:

Avoid ignitions within 12 miles to the S through WSW of SSRAs.  No additional restrictions necessary.

For Sunday:

Avoid ignitions within 10 miles to the SW through NW of SSRAs.  No additional restrictions necessary.

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