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: Wednesday, September 30, 2009       2:35 PM      Jim Little

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

A weak front moves into western Washington and brushes northwest Oregon on Thursday.  This is unlikely to have much effect on northeast Oregon.  Weak high pressure covers the southern portion of the state.

    OUTLOOK (FRIDAY - SUNDAY):

By Friday a weak upper trough moves into British Columbia and extends southward into the Pacific Northwest.  Showers should be confined to areas west of the Cascades.  .  Mixing heights will remain high.  The upper trough stalls and strengthens into an upper low on Saturday and drops into Washington.  Warm air aloft moves over the region on the southwesterly flow aloft ahead of the low.  This will suppress mixing heights to near 3000 feet Saturday. .  On Sunday the upper low drops into northern California, then into Nevada, showers will continue early Sunday, then begin to taper off later in the day.  .  

2.  DISPERSION

THURSDAY

Zone 630 and 632:
Mixing height 3600 - 4600 ft during the morning.  Mixing height rises above 5000 ft during the afternoon then lowers below 1000 ft during the evening.

Transport wind SSE to SSW at 4 - 8 mph during the morning.  Transport wind becomes light and variable and controlled by local terrain during the afternoon and evening.

Surface wind light and variable and controlled by local terrain during the morning.  Surface wind increases to NW to NNE at 4 - 8 mph during the afternoon then becomes light and variable during the evening.
 
Zone 633 - 638:
Mixing height above 5000 ft during the morning and afternoon.  Mixing height lowers below 1000 ft during the evening.

Transport wind light and variable and controlled by local terrain.  Transport wind increases to ESE to S at 5 - 9 mph during the evening.

Surface wind light and variable and controlled by local terrain.

OUTLOOK:

FRIDAY
Mixing height below 1000 ft early rising to 3500 to 4500 ft by late morning rising above 5000 ft during the afternoon.  Transport wind S to SW at 7 - 11 mph during the morning becoming WNW to NNW at 6 - 12 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 2200 to 3200 ft throughout the day.  Transport wind light and variable.  Surface wind NW to NNW at 30 - 50 mph during the morning becoming light and variable during the afternoon.

SUNDAY
Mixing height 1500 to 2500 ft during the morning rising to 4000 to 5000 ft during the afternoon.  Transport wind NW to N at 4 - 8 mph.  Surface wind light and variable during the morning becoming NW to NNE at 4 - 8 mph during the afternoon.

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, October 1, 2009.
    ==================================================================

Zone 630 and 632:
Avoid ignitions within 12 miles in all directions of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 20 miles in all directions of SSRAs.  

Zone 633 - 638:
Avoid ignitions within 12 miles in all directions of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 20 miles in all directions of 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