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

[ODF Smoke Management Instructions]

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS

SALEM FORESTRY WEATHER CENTER

OREGON DEPARTMENT OF FORESTRY



ISSUED: Saturday, April 17, 2010          2:40 PM            Jim Trost



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



Upper low in the Gulf of Alaska with the ridge in the western Rockies.  Result is a dry day with mild temperatures and abundant sunshine.  The  mixing level rises fairly rapidly during the day but falls even more rapidly in the evening. Mixing becomes very poor overnight.  Transport light early but establishes a southwest to westerly flow during the afternoon.  Good dispersion during the day but poor otherwise.



    OUTLOOK (MONDAY - WEDNESDAY):



Upper trough approaches late Monday.  Precipitation probably won't begin until early Tuesday as the trough moves onshore.  Chances of precipitation decrease again Wednesday but temperatures will be on the cool side.  Snow possible at the higher elevations late Tuesday and into Wednesday.  Dispersion improves as the trough nears but begins to worsen again Wednesday.





2.  DISPERSION



SUNDAY

Mixing height 3500 - 4500 ft during the morning, rising above 5000 ft in the afternoon.  Mixing height falls below 1000 ft during the evening.



Transport wind light and variable in the morning and SSW to WSW at 8 - 14 mph during the afternoon.  Transport decreases to SW to W at 4 - 8 mph during the evening.



Surface wind light and variable, becoming SSW to WSW at 6 - 12 mph during the afternoon. Wind returns to light and variable during the evening.



OUTLOOK:



MONDAY

Mixing height below 1000 ft early, rising to 4400 - 5000 ft by late morning and above 5000 ft during the afternoon.  Transport wind S to SW at 10 - 18 mph.  Surface wind S to SW at 6 - 12 mph.



TUESDAY

Mixing height below 1000 ft early, 1900 - 2900 ft by late morning and 3500 - 4500 ft during the afternoon.  Transport wind SSE to SW at 6 - 12 mph in the morning and WSW to WNW at 9 - 15 mph during the afternoon.  Surface wind light and variable, becoming W to NW at 4 - 8 mph during the afternoon.



WEDNESDAY

Mixing height below 1000 ft early, 2500 - 3500 ft by late morning, and 3700 - 4700 ft during the afternoon.  Transport wind NW to N at 4 - 8 mph.  Surface wind light and variable during the morning, becoming NW to N at 4 - 8 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 Sunday, April 18, 2010.

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Avoid ignitions within 12 miles to the SSE through WNW of SSRAs.  For units that will smolder into the night, avoid burning within at least 20 miles to the SSE through WNW in or near drainages leading to SSRAs.  Watch for shifting transport winds.



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

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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