SMI South Central (Smoke Management Instructions) South Central Smoke Management Instructions

[ODF Smoke Management Instructions]

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS

SALEM FORESTRY WEATHER CENTER

OREGON DEPARTMENT OF FORESTRY



ISSUED: Wednesday, November 17, 2010       2:40 PM      Pete Parsons



1.  DISCUSSION AND FORECAST FOR SOUTH CENTRAL OREGON ZONES 624 AND 625



THURSDAY



A vigorous cold front will bring rain, snow, and blustery winds to the region in the morning with the snow level around 4500 feet.  By afternoon, winds will taper off and steady precipitation will turn to showers.  A very cold upper-level trough will drop southward along the British Columbia coastline, to just off the Pacific Northwest coast, with strong westerly flow aloft developing over Oregon and maintaining some shower activity, especially over western facing mountain slopes.  Snow levels will drop to near 3500 feet by evening.  Expect good smoke dispersal conditions.


OUTLOOK (FRIDAY-SUNDAY)

A very cold upper-level trough will remain over the region during the outlook period with generally fair to good smoke dispersal conditions.



A surface low-pressure center will slowly sag southward, to just off the central Oregon coast, on Friday, with southwesterly transport winds.  Little change in the overall pattern is forecast for Saturday and Sunday.  Snow levels will drop to between 2000 and 2500 feet with showers.  Transport winds will likely maintain a southerly component through Saturday and turn more westerly on Sunday.



2.  DISPERSION



THURSDAY

Mixing height above 5000 ft throughout the day.  Mixing height lowers to 2000 - 3000 ft during the evening.



Transport wind SW to WSW at 25 - 45 mph during the morning.  Transport wind decreases to SW to WSW at 15 - 29 mph during the afternoon and decreases to SW to W at 10 - 20 mph during the evening.



Surface wind SSW to WSW at 10 - 20 mph during the morning.  Surface wind decreases to SW to W at 6 - 10 mph during the afternoon then becomes light and variable and controlled by local terrain during the evening.



OUTLOOK:



FRIDAY

Mixing height below 1000 ft early rising to 2500 - 3500 ft by late morning rising above 5000 ft during the afternoon.  Transport wind SW to W at 10 - 16 mph.  Surface wind light and variable during the morning becoming SSW to WSW at 5 - 9 mph during the afternoon.



SATURDAY

Mixing height below 1000 ft early rising to 2000 - 3000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind SSW to SW at 10 - 20 mph during the morning becoming SSW to SW at 15 - 25 mph during the afternoon.  Surface wind S to SW at 6 - 12 mph.



SUNDAY

Mixing height 2000 - 3000 ft during the morning rising above 5000 ft during the afternoon.  Transport wind SW to W at 9 - 15 mph during the morning becoming W to NW at 12 - 22 mph during the afternoon.  Surface wind SSW to WSW at 4 - 8 mph during the morning becoming WSW to WNW at 8 - 12 mph during the afternoon.



3.  BURNING INSTRUCTIONS FOR ZONES 624 AND 625 INCLUDING THE WALKER

    RANGE PORTION OF ZONE 624

This instruction is valid for burning conducted on Thursday, November 18, 2010.

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Avoid ignitions within 10 miles to the SW through W of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 15 miles to the SW through WNW in or near drainages leading to SSRAs.



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4.  SPECIAL NOTE:



    The smoke management forecaster is available at (503)

    945-7401.  The smoke management forecaster is available

    to discuss specific burns.  The duty forecaster phone

    number is (503) 945-7401. Please call this number and

    not individual's numbers to discuss daily burning. Please

    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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