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: Saturday, June 19, 2010       2:40 PM      Pete Parsons



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



    SUNDAY


A broad and cool upper-level trough will remain over Washington and Oregon.  The center of an embedded upper-level disturbance will move over southwestern Oregon in the early morning and slowly progress eastward, to over southeastern Oregon, by evening.  Scattered showers are likely in the morning but should decrease later in the day, as the flow aloft turns more westerly and air mass begins to stabilize.  Cool northwesterly transport winds will cap high temperatures around 10-15 below normal.  Cool air aloft will yield high mid-afternoon mixing heights, but watch for rapidly lowering mixing heights in the early evening. Lingering smoke may get trapped near the ground overnight.

    OUTLOOK (MONDAY-WEDNESDAY)

A weak and transitory upper-level ridge will move over western Oregon Monday and drift eastward, to over eastern Oregon, on Tuesday.  Progressively more sunshine will help temperatures recover to slightly above normal by Tuesday.  Transport winds will decrease Monday and perhaps become light southerly by Tuesday. A weak upper-level trough will bring increasing southwesterly flow aloft on Wednesday.  Temperatures will cool slightly with an increasing threat of showers or thunderstorms.  Transport winds will turn onshore late in the day.  High afternoon mixing heights are expected during the outlook period.


2.  DISPERSION



SUNDAY

Mixing height below 1500 ft early rising to 2000 - 3000 ft by late morning.  Afternoon mixing height rises above 5000 ft then lowers to 2000 - 3000 ft during the evening.



Transport wind NW to N at 6 - 10 mph during the morning.  Transport wind increases to NW to NNW at 9 - 15 mph during the afternoon and evening.



Surface wind NW to N at 4 - 8 mph during the morning.  Surface wind increases to NW to NNW at 8 - 12 mph during the afternoon and evening.



OUTLOOK:



MONDAY

Mixing height below 1000 ft early rising to 4000 - 5000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming NW to NNE at 6 - 10 mph during the afternoon.  Surface wind light and variable during the morning becoming NW to NNE at 5 - 9 mph during the afternoon.



TUESDAY

Mixing height below 1000 ft early rising to 4500 - 5000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind SSE to SSW at 4 - 8 mph during the morning becoming SSW to WSW at 4 - 8 mph during the afternoon.  Surface wind light and variable during the morning becoming SSW to WSW at 4 - 8 mph during the afternoon.



WEDNESDAY

Mixing height below 1000 ft early rising to 4000 - 5000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind SSW to WSW at 6 - 10 mph.  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 Sunday, June 20, 2010.

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



Avoid ignitions within 12 miles to the NW through N of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 20 miles to the NW through NE in or near drainages leading to SSRAs.  Recommend against burning units that will smolder significantly overnight.  Complete ignitions by 5 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/20100619/d94c212b/attachment.html>