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: Friday, September 17, 2010       2:40 PM      Pete Parsons



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



    SATURDAY



An autumn-like weather pattern has set up across the Pacific Northwest.  A strong upper-level trough is centered about 700 miles off the Oregon and northern California coast and will circulate another surges of rain northward across western Oregon during the afternoon and evening.  Clouds will increase during the day, across south-central Oregon, with rain likely spreading from southwest to northeast across the region late in the day.


     OUTLOOK (SUNDAY-TUESDAY)

Rainfall will increase and likely dampen the entire region Sunday with the upper-level trough finally moving onshore Sunday night.  Colder air aloft will turn the steady rain to showers Sunday night with a slight chance of t-storms.  A few showers could linger into Monday as the flow aloft turns more westerly and begins to dry out.  Skies should clear on Tuesday with a continued westerly flow aloft.



2.  DISPERSION



SATURDAY

Mixing height below 1000 ft early rising to 2800 - 3800 ft by late morning.  Afternoon mixing height rises to 4000 - 5000 ft then lowers to 1000 - 2000 ft during the evening.



Transport wind SSE to SSW at 9 - 15 mph during the morning and afternoon.  Transport wind decreases to S to SW at 4 - 8 mph during the evening.



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



OUTLOOK:



SUNDAY

Mixing height below 1000 ft early rising to 2200 - 3200 ft by late morning rising above 5000 ft during the afternoon.  Transport wind S to SSW at 10 - 22 mph.  Surface wind SSE to SW at 6 - 12 mph during the morning becoming SSW to WSW at 9 - 15 mph during the afternoon.



MONDAY

Mixing height 2200 - 3200 ft during the morning rising above 5000 ft during the afternoon.  Transport wind WSW to WNW at 8 - 12 mph.  Surface wind SW to W at 4 - 8 mph during the morning becoming W to NW at 5 - 9 mph during the afternoon.



TUESDAY

Mixing height below 1000 ft early rising to 2500 - 3500 ft by late morning rising above 5000 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.



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

    RANGE PORTION OF ZONE 624

This instruction is valid for burning conducted on Saturday and Sunday, September 18 and 19, 2010.

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For Saturday:



Avoid ignitions within 15 miles to the SE through SW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 30 miles to the SE through SW in or near drainages leading to SSRAs.  Recommend against burning units that will smolder significantly overnight.  Complete ignitions by 4 p.m.



For Sunday:



Avoid ignitions within 10 miles to the SSW through WSW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 15 miles to the SSW through WSW 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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