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, October 29, 2010       2:35 PM      Pete Parsons



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



SATURDAY



The upper-level trough that was centered just off the California coast on Friday will weaken and slide inland across California and Nevada.  A moist southwesterly flow aloft will keep skies mostly cloudy over the region with a few areas of light rain possible.  Increasing southwesterly transport winds will improve smoke dispersal conditions from marginal to fair in the afternoon.


OUTLOOK (SUNDAY-TUESDAY)


A cold front is forecast to bring more rain to the region Saturday night and Sunday morning, with decreasing showers Sunday afternoon.  Snow levels should remain in the 6000 to 6500 foot range with south to southwesterly transport winds and fair to good smoke dispersal conditions. Skies will likely clear with rapidly lower mixing heights Sunday evening.



A warm front may bring considerable clouds to the region Monday, but precipitation appears as if it will stay to the north and west.  Snow levels will lift to above 8000 feet.  Light southerly transport winds and suppressed mixing heights will likely provide only marginal smoke dispersal conditions.



A strong upper-level ridge is forecast to build over the region, on Tuesday, pushing the threat of warm-frontal rain north of Oregon.  Stagnant conditions will advance northward across the region.  Valley fog should become more widespread with possible persistent surface-based inversions.  Light southeasterly transport winds and low mixing heights will generally make for poor smoke dispersal conditions.  Some ridges could get above the low-level temperature inversions in the afternoon.



2.  DISPERSION



SATURDAY



Zone 630 and 632:

Mixing height below 1000 feet early rising to 2000 - 3000 ft during the late morning.  Afternoon mixing height rises to 3000 - 4000 ft then lowers to 2000 - 3000 ft during the evening.



Transport wind S to SW at 6 - 12 mph during the morning.  Transport wind increases to SSW to WSW at 10 - 20 mph during the afternoon and evening.



Surface wind light and variable and controlled by local terrain during the morning.  Surface wind increases to SSW to WSW at 4 - 8 mph during the afternoon and evening.



Zone 633 - 638:

Mixing height below 1000 feet early rising to 1500 - 2500 ft during the late morning.  Afternoon mixing height rises to 3000 - 4000 ft then lowers to 1500 - 2500 ft during the evening.



Transport wind SSE to SSW at 5 - 9 mph in the morning increasing to 7-12 mph by late in the late afternoon.



Surface wind light and variable and controlled by local terrain.  Surface wind increases to SSE to SSW at 4 - 8 mph during the evening.



OUTLOOK:



SUNDAY

Mixing height 3200 to 4200 ft during the morning rising to 4000 to 5000 ft during the afternoon.  Transport wind SSW to SW at 14 - 28 mph during the morning becoming SSW to WSW at 10 - 20 mph during the afternoon.  Surface wind S to SSW at 8 - 14 mph during the morning becoming S to SW at 4 - 8 mph during the afternoon.



MONDAY

Mixing height below 1000 ft early rising to 1300 to 2300 ft by late morning rising to 1900 to 2900 ft during the afternoon.  Transport wind SSE to SSW at 8 - 12 mph.  Surface wind SE to S at 4 - 8 mph.



TUESDAY

Mixing height below 1000 ft during the morning rising to 1000 to 2000 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.



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, October 30, 2010.

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



Zone 630 and 632:

Delay ignitions until 10 a.m.  Avoid ignitions within 12 miles to the S through WSW of SSRAs.  No additional restrictions necessary.



Zone 633 - 638:

Delay ignitions until 10 a.m.  Avoid ignitions within 15 miles to the SE through WSW of SSRAs.  Verify transport winds away from SSRAs if burning in any other direction.



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

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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