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

[ODF Smoke Management Instructions]

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS

SALEM FORESTRY WEATHER CENTER

OREGON DEPARTMENT OF FORESTRY



ISSUED: Saturday, April 17, 2010         2:31 PM            Jim Trost



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



Area between systems Sunday.  Upper low well to the west while the ridge is in the foothills of the Rockies.  This will bring a dry day with mild temperatures and abundant sunshine.  As a result, mixing level rises fairly rapidly during the day.  Down side is that mixing worsens even more rapidly in the evening and becomes very poor overnight.  Transport light early but sets up a southwest to westerly flow during the afternoon.  Mixed bag for dispersion.  Poor until the wind increases, good to excellent in the afternoon but becoming poor again in the evening.



    OUTLOOK (MONDAY - WEDNESDAY):



Upper trough approaches late Monday.  Precipitation for most of the area begins early Tuesday as the trough comes onshore.  Then precipitation decreases Wednesday but temperatures will be on the cool side.  Likely to see some snow at the higher elevations late Tuesday and Wednesday.  Dispersion improves with the trough but begins to worsen again Wednesday.



2.  DISPERSION



SUNDAY



Zone 630 and 632:

Mixing height 2400 - 3400 ft during the morning.  Mixing height rises above 5000 ft in the afternoon but falls below 1000 ft during the evening.



Transport wind light and variable, controlled by local terrain, during the morning; increasing to SSW to WSW at 5 - 9 mph during the afternoon. Light and variable transport returns during the evening.



Surface wind light and variable, becoming SSW to WSW at 4 - 8 mph during the afternoon. Surface wind becomes light and variable in the evening.



Zone 633 - 638:

Mixing height 3800 - 4800 ft in the morning, rising above 5000 ft during the afternoon.  Mixing height falls below 1000 ft early in the evening.



Transport wind light and variable, controlled by local terrain in the morning and SSW to WSW at 4 - 8 mph during the afternoon. As the air mass stabilizes transport returns to light and variable in the evening.



Surface wind light and variable, becoming SSW to WSW at 4 - 8 mph during the afternoon. Surface wind light and variable in the evening.



OUTLOOK:



MONDAY

In the west mixing height below 1000 ft early, rising above 5000 ft by late morning and through the afternoon.  In the east mixing height rises to 3200 to 4200 ft by late morning and above 5000 ft during the afternoon.  Transport wind SSE to SSW at 10 - 20 mph in the morning and SSW to SW at 8 - 12 mph during the afternoon.  Surface wind SE to S at 7 - 13 mph during the morning and SSW to WSW at 5 - 9 mph in the afternoon.



TUESDAY

Mixing height below 1000 ft early, 2000 to 3000 ft by late morning, and 3800 to 4800 ft during the afternoon.  Transport wind SW to WNW at 5 - 9 mph during the morning and W to NW at 6 - 10 mph in the afternoon.  Surface wind light and variable, becoming NW to N at 4 - 8 mph during the afternoon.



WEDNESDAY

Mixing height below 1000 ft early, 2000 to 3000 ft by late morning, and 3300 to 4300 ft during the afternoon.  Transport wind NW to N at 6 - 11 mph.  Surface wind NW to N 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 Sunday, April 18, 2010.

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



Zone 630 and 632:

Avoid ignitions within 15 miles in all directions of SSRAs.  For units that will smolder into the evening, avoid burning within at least 30 miles in all directions of SSRAs.  Recommend against burning units that will smolder significantly overnight.  Care needed in selecting units as residual smoke will likely flow down drainages and into low-lying areas overnight.



Zone 633 - 638:

Avoid ignitions within 12 miles in all directions of SSRAs.  For units that will smolder into the evening, avoid burning within at least 25 miles in all directions of SSRAs.  Recommend against burning units that will smolder significantly overnight.  Care needed in selecting units as residual smoke will likely flow down drainages and into low-lying areas overnight.



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

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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