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, June 9, 2010       2:40 PM      Pete Parsons



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



    THURSDAY


Another in a series of vigorous upper-level troughs will move over western Oregon in the morning and across eastern Oregon during the afternoon.  Cold air aloft will drop the snow level to 5-6000 feet with mostly cloudy skies and scattered shower activity.  Temperatures will be well below normal.  Smoke dispersal conditions will be good with high mixing heights and onshore transport winds.  The flow aloft is forecast to slowly turn more northerly overnight, with the air mass stabilizing and drying.  Showers should end by Friday morning.

    OUTLOOK (FRIDAY-SUNDAY)

An upper-level ridge will build just offshore on Friday with the flow aloft drying and turning north-northwesterly.  That will finally put an end to the long stretch of wet weather with skies clearing and transport winds turning mostly northerly.  Even with clearing skies, cool air aloft will keep surface temperatures slightly below normal.  The upper-level ridge will move over western Oregon Saturday and eastern Oregon Sunday.  Skies will clear with transport winds turning offshore and surface temperatures warming to above normal.  Daytime heating should yield high afternoon mixing heights.


2.  DISPERSION



THURSDAY

Mixing height below 2500 ft early rising to 3500 - 4500 ft by late morning.  Afternoon mixing height rises above 5000 ft then lowers to 2500 - 3500 ft during the evening.



Transport wind WNW to NNW at 10 - 16 mph.



Surface wind WNW to NNW at 9 - 15 mph.



OUTLOOK:



FRIDAY

Mixing height 2200 - 3200 ft during the morning rising above 5000 ft during the afternoon.  Transport wind N to NE at 5 - 9 mph during the morning becoming N to NE at 10 - 20 mph during the afternoon.  Surface wind light and variable during the morning becoming N to NE at 10 - 16 mph during the afternoon.



SATURDAY

Mixing height 2500 - 3500 ft during the morning rising above 5000 ft during the afternoon.  Transport wind NNE to ENE at 8 - 12 mph.  Surface wind light and variable during the morning becoming NNE to ENE at 6 - 10 mph during the afternoon.



SUNDAY

Mixing height below 1000 ft early rising to 4500 - 5000 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 Thursday, June 10, 2010.

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



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



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

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/20100609/70fd21ed/attachment.html>