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, December 3, 2010       2:40 PM      Nick Yonker



***Smoke management has ended weekend forecasting for the fall burning season.  Today's forecast will include instructions for both Saturday and Sunday.  Please call this afternoon if you want to seek waivers from today's instruction for the weekend.***



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



Upper level ridge will continue to build over the state tomorrow as an upper level low digs to the south several hundred miles to the west and southwest of the state.  Southerly flow aloft will stream some mid and high clouds into the region bringing a risk of a few sprinkles or snow flurries.  Otherwise, expect mostly dry and fair conditions with some patchy fog in the valleys during the morning hours.  Air mass will be stable and wind flow light SE'erly, making for poor smoke dispersion.



    OUTLOOK (SUNDAY - TUESDAY):



Upper level low drops southward to just off the southern California coast and will continue to stream clouds over the state with a continued chance of light showers.  Upper ridge gradually moves to the east.  Air mass will remain stable with continued offshore to southerly flow.  This low gradually dissipates Sunday and Monday but another low moves in to the west of the state by Monday.  Air mass will remain stable and will also dry out some.  Low will move closer by Tuesday to bring a front just offshore and increase the chance of clouds later in the day.  Wind flow will increase from the south and improve mixing and smoke dispersion.



2.  DISPERSION



SATURDAY

Mixing height below 1000 ft during the morning.  Afternoon mixing height rises to 1000 - 2000 ft then lowers below 1000 ft during the evening.



Transport wind light and variable and controlled by local terrain during the morning.  Transport wind increases to SE to S at 8 - 12 mph during the afternoon and evening.



Surface wind light and variable and controlled by local terrain during the morning.  Surface wind increases to ESE to S at 5 - 9 mph during the afternoon then becomes light and variable during the evening.



OUTLOOK:



SUNDAY

Mixing height below 1000 ft during the morning rising to 1000 - 2000 ft during the afternoon.  Transport wind ESE to S at 6 - 10 mph during the morning becoming SE to S at 10 - 20 mph during the afternoon.  Surface wind light and variable during the morning becoming SE to SSW at 6 - 12 mph during the afternoon.



MONDAY

Mixing height below 1000 ft early rising to 1000 - 1700 ft by late morning and through the afternoon.  Transport wind SSE to SSW at 8 - 12 mph during the morning becoming S to SSW at 10 - 22 mph during the afternoon.  Surface wind SE to S at 6 - 10 mph during the morning becoming SSE to SSW at 10 - 20 mph during the afternoon.



TUESDAY

Mixing height below 1000 ft early rising to 1000 - 2000 ft by late morning rising to 2000 - 3000 ft during the afternoon.  Transport wind SSE to S at 15 - 25 mph during the morning becoming SSE to SSW at 18 - 32 mph during the afternoon.  Surface wind SE to S at 9 - 15 mph.



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, December 4 and 5, 2010.

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



For Saturday:



Unfavorable burning situation due to very poor smoke dispersion.  Delay ignitions until 10 a.m.  Avoid ignitions within 20 miles to the ESE through SSW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 35 miles to the ESE through SSW in or near drainages leading to SSRAs.  Recommend against burning units that will smolder significantly overnight.  Complete ignitions by 2:30 p.m.



For Sunday:



Unfavorable burning situation due to very poor smoke dispersion.  Delay ignitions until 10 a.m.  Avoid ignitions within 20 miles to the ESE through SSW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 35 miles to the ESE through SSW in or near drainages leading to SSRAs.  Recommend against burning units that will smolder significantly overnight.  Complete ignitions by 2:30 p.m.



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

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

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://omls.oregon.gov/pipermail/smi_south_central/attachments/20101203/6fdcea30/attachment.html>