SMI Northeast (Smoke Management Instructions) Smoke Management Instructions

[ODF Smoke Management Instructions]

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS

SALEM FORESTRY WEATHER CENTER

OREGON DEPARTMENT OF FORESTRY

 

ISSUED: Wednesday, April 28, 2010       2:35 PM      Jim Little

 

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

 

    THURSDAY

 

A cold upper-level trough will shift eastward, to over the northern Rockies, with a northwesterly flow aloft over Oregon.  Snow levels will start out near 2500 feet in the morning and rise to around 3500 feet in the afternoon.  The air mass will still be somewhat unstable with daytime heating increasing shower activity in the afternoon.  Precipitation will be enhanced on western slopes of mountain ranges. Afternoon mixing heights will rise above 5000 feet for good to excellent smoke dispersal conditions. Surface temperatures will be well below normal.

 

    OUTLOOK (FRIDAY-SUNDAY)

 

The strong upper-level trough will continue to shift eastward with the flow aloft over Oregon becoming progressively drier and more northerly.  The air mass will remain unstable enough for daytime heating to trigger scattered afternoon and evening showers on Friday with good to excellent smoke dispersion.  Skies will begin clearing Saturday and Sunday with only a slight chance of afternoon showers.  Chilly overnights will make for lower morning mixing heights, but afternoon smoke dispersion should be good on Saturday and fair on Sunday.  The snow level will rise from 3500 feet, on Friday, to 6000 feet by Sunday.

 

2.  DISPERSION

 

THURSDAY

 

Zone 630 and 632:

Mixing height 3800 - 4800 ft during the morning.  Mixing height rises to above 5000 ft during the afternoon then lowers to 3900 - 4900 ft during the evening.

 

Transport wind WNW to NW at 18 - 30 mph during the morning.  Transport wind increases to WNW to NW at 21 - 37 mph during the afternoon and evening.

 

Surface wind WNW to NW at 13 - 25 mph throughout the day.

 

Zone 633 - 638:

Mixing height 3500 - 4500 ft during the morning.  Mixing height rises to above 5000 ft during the afternoon then lowers to 3000 - 4000 ft during the evening.

 

Transport wind W to NW at 18 - 30 mph throughout the day.

 

Surface wind W to NW at 12 - 24 mph.

 

OUTLOOK:

 

FRIDAY

In the west mixing height 2900 to 3900 ft during the morning rising above 5000 ft during the afternoon.  In the east mixing height 1900 to 2900 ft during the morning rising above 5000 ft during the afternoon.  Transport wind WNW to NW at 12 - 24 mph during the morning becoming NW to NNW at 16 - 30 mph during the afternoon.  Surface wind W to NW at 9 - 15 mph during the morning becoming NW to NNW at 12 - 22 mph during the afternoon.

 

SATURDAY

Mixing height 2100 to 3100 ft during the morning rising above 5000 ft during the afternoon.  Transport wind NW to N at 8 - 12 mph.  Surface wind NW to N at 5 - 9 mph.

 

SUNDAY

Mixing height below 1000 ft early rising to 3500 to 4500 ft by late morning rising above 5000 ft during the afternoon.  Transport wind NW to N at 10 - 20 mph during the morning becoming NW to N at 15 - 25 mph during the afternoon.  Surface wind NW to N at 6 - 10 mph during the morning becoming NW to N at 10 - 16 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, April 29, 2010.

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

 

Zone 630 and 632:

Avoid ignitions within 10 miles to the WNW through NW of SSRAs.  Care needed in selecting units as smoke will likely fumigate along the ground in wind prone areas.  No additional restrictions necessary.  

 

Zone 633 - 638:

Avoid ignitions within 10 miles to the W through NW of SSRAs.  Care needed in selecting units as smoke will likely fumigate along the ground in wind prone areas.  No additional restrictions necessary.  

 

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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