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: Thursday, October 21, 2010       2:40 PM      Pete Parsons



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



FRIDAY



The first in a series of progressively stronger weather systems will likely bring increasing clouds to the region but only a chance of a few light showers.  Cooling aloft and southwesterly transport winds will provide good smoke dispersal conditions.


OUTLOOK (SATURDAY-MONDAY)


The next weather system will likely be strong enough to bring some light rain to the region Friday night with rain showers decreasing during the day on Saturday.  Rainfall totals will range from less than one-tenth of an inch to around one-quarter of an inch across the higher terrain.  Ventilation conditions will continue to be good with brisk southwesterly transport winds.



A strong warm front will bring steady rain to the region Saturday night, followed by a moisture laden cold front Sunday morning.  This system could bring from one-half to one inch of rain along with strong south to southwesterly winds.  A strong westerly jet stream, aimed right at Oregon, will continue significant shower activity Sunday afternoon through Monday, with the snow level dropping from more than 6000 feet early Sunday to below 4000 feet on Monday.  A few inches of snow accumulation are possible, above 4500 feet, by Monday night.



2.  DISPERSION



FRIDAY

Mixing height below 1500 ft early rising to 3000 - 4000 ft by late morning.  Afternoon mixing height rises above 5000 ft then lowers to 1500 - 2500 ft during the evening.



Transport wind S to SW at 8 - 12 mph during the morning.  Transport wind increases to SSW to WSW at 10 - 20 mph during the afternoon and evening.



Surface wind S to SW at 4 - 8 mph during the morning.  Surface wind increases to SSW to WSW at 8 - 12 mph during the afternoon and evening.



OUTLOOK:



SATURDAY

Mixing height 3200 - 4200 ft during the morning rising to 4000 - 5000 ft during the afternoon.  Transport wind SW to WSW at 15 - 29 mph during the morning becoming SSW to SW at 12 - 22 mph during the afternoon.  Surface wind SSW to WSW at 8 - 14 mph.



SUNDAY

Mixing height 3800 - 4800 ft during the morning and through the afternoon.  Transport wind SW to WSW at 25 - 45 mph during the morning becoming SW to W at 22 - 38 mph during the afternoon.  Surface wind SSW to WSW at 15 - 25 mph during the morning becoming SSW to WSW at 10 - 20 mph during the afternoon.



MONDAY

Mixing height 3500 - 4500 ft during the morning rising to 4500 - 5000 ft during the afternoon.  Transport wind WSW to WNW at 18 - 32 mph.  Surface wind SW to W at 10 - 18 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 Friday, October 22, 2010.

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



Avoid ignitions within 15 miles to the S through WSW of SSRAs.  Complete ignitions by 4 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/20101021/314b0d17/attachment.html>