SMI Northeast (Smoke Management Instructions) (no subject)

[ODF Smoke Management Instructions]

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS

SALEM FORESTRY WEATHER CENTER

OREGON DEPARTMENT OF FORESTRY



ISSUED: Monday, November 22, 2010       2:35 PM      Jim Little



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


------------------- Northeast  ------------------------------------
    TUESDAY
An upper level trough, oriented NE to SW moves southeastward across the region on Tuesday.  This supports a cold front - the leading edge of modified arctic air - as it also sweeps across the region Monday night and early Tuesday morning.  This front will usher in cooler temperatures for mid week.  Low elevation snow will fall as the front passes through, then drier air will filter southward to end any precipitation.  Expect some sunshine and fair to good smoke dispersal conditions with a generally northwesterly transport flow.
    EXTENDED OUTLOOK (WEDNESDAY - FRIDAY)
By Wednesday upper level flow is northerly, cold, and generally dry over the Pacific Northwest.  Scattered snow showers are still possible, however.  Subsidence aloft will suppress maximum mixing heights a bit, but smoke dispersal conditions should remain generally fair with a light southwesterly flow.   An upper ridge axis passes through early Thursday and winds aloft back to more westerly, but maximum mixing heights are further suppressed resulting in poor smoke dispersal conditions.  On Friday a strong westerly flow aloft over the eastern Pacific and the Pacific Northwest will push a Pacific cold front into northwestern Oregon early in the day.  This will spread precipitation east of the Cascades during the afternoon and help push smoke dispersal conditions back into the fair category.



2.  DISPERSION



TUESDAY



Zone 630 and 632:

Mixing height 1700 - 2700 ft during the morning.  Afternoon mixing height rises to 3500 - 4500 ft then lowers to 2000 - 3000 ft during the evening.



Transport wind WNW to NNW at 6 - 12 mph during the morning and afternoon.  Transport wind decreases to WNW to NNW at 5 - 9 mph during the evening.



Surface wind WNW to NNW at 6 - 10 mph during the morning and afternoon.  Surface wind becomes light and variable and controlled by local terrain during the evening.

Zone 633 - 638:

Mixing height 1800 - 2800 ft during the morning.  Afternoon mixing height rises to 3500 - 4500 ft then lowers to 2100 - 3100 ft during the evening.



Transport wind WNW to NNW at 9 - 15 mph during the morning and afternoon.  Transport wind decreases to W to NW at 5 - 9 mph during the evening.



Surface wind WNW to NNW at 8 - 14 mph during the morning and afternoon.  Surface wind decreases to W to NW at 4 - 8 mph during the evening.



OUTLOOK:



WEDNESDAY

In the west mixing height below 1000 ft early rising to 1700 to 2700 ft by late morning rising to 2500 to 3500 ft during the afternoon.  In the east mixing height 1400 to 2400 ft during the morning rising to 2500 to 3500 ft during the afternoon.  Transport wind W to NW at 6 - 10 mph.  Surface wind light and variable.



THURSDAY

Mixing height 1000 to 1700 ft throughout the day.  Transport wind SSE to SW at 4 - 8 mph.  Surface wind SSE to SW at 4 - 8 mph during the morning becoming ESE to S at 4 - 8 mph during the afternoon.



FRIDAY

Mixing height below 1000 ft early rising to 1000 to 2000 ft by late morning rising to 3000 to 4000 ft during the afternoon.  Transport wind S to SW at 4 - 8 mph.  Surface wind S to SW at 4 - 8 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 Tuesday, November 23, 2010.

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



Zone 630 and 632:

Avoid ignitions within 12 miles to the WNW through N of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 20 miles to the W through N in or near drainages leading to SSRAs.



Zone 633 - 638:

Avoid ignitions within 12 miles to the W through NNW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 20 miles to the WSW through NNW in or near drainages leading to SSRAs.



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

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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