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, May 22, 2010       2:40 PM      Pete Parsons



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


SUNDAY

An unseasonably cold upper-level trough will begin pushing east of the region with the flow aloft drying and turning northwesterly.  Clearing skies will lead to a cold morning, with low-level temperature inversions forming.  Skies should be partly to mostly cloudy with a few lingering showers, mainly over higher terrain.  Maximum temperatures will warm several degrees, relative to Saturday, but remain well below normal.  The snow level will lift to about 5500 feet in the afternoon.  High late-morning and afternoon mixing heights will make for good daytime smoke dispersal conditions.

    OUTLOOK (MONDAY-WEDNESDAY)

The upper-level trough will push well east of the region by Monday with a drier west-northwesterly flow aloft over south-central Oregon.  Partial clearing and light winds will form low-level overnight temperature inversions, so residual smoke may be trapped near the ground.  High afternoon mixing heights will provide fair to good daytime smoke dispersal conditions with increasing onshore transport winds.  A weakening weather system is forecast to bring increasing clouds Monday afternoon but not likely any showers.  Maximum temperatures will recover to within about 5 degrees of normal. A strong southwesterly jet stream is forecast to direct another cold front onshore Tuesday with rain spreading back across south-central Oregon Tuesday afternoon.  Another upper-level trough will bring showers to the region Wednesday with snow levels dropping below 5000 feet. High mixing heights and brisk transport winds should make for good smoke dispersal conditions.


2.  DISPERSION



SUNDAY

Mixing height below 1500 ft early rising to 3500 - 4500 ft by late morning.  Afternoon mixing height rises above 5000 ft then lowers to 1500 - 2500 ft during the evening.



Transport wind WNW to NNW at 4 - 8 mph.



Surface wind NNW to NNE at 4 - 8 mph.



OUTLOOK:



MONDAY

Mixing height below 1000 ft early rising to 3000 - 4000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind SSW to WSW at 8 - 12 mph during the morning becoming SW to W at 10 - 20 mph during the afternoon.  Surface wind SSW to WSW at 5 - 9 mph during the morning becoming SW to WSW at 10 - 18 mph during the afternoon.



TUESDAY

Mixing height below 1000 ft early rising to 3000 - 4000 ft by late morning rising to 4000 - 5000 ft during the afternoon.  Transport wind SSE to SSW at 15 - 29 mph during the morning becoming SSW to SW at 15 - 29 mph during the afternoon.  Surface wind SE to S at 10 - 18 mph during the morning becoming SW to WSW at 12 - 24 mph during the afternoon.



WEDNESDAY

Mixing height 2800 - 3800 ft during the morning rising to 4500 - 5000 ft during the afternoon.  Transport wind S to SW at 12 - 24 mph.  Surface wind SSW to WSW 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 Sunday, May 23, 2010.

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



Avoid ignitions within 12 miles to the WNW through N of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 20 miles to the SSW through N in or near drainages leading to SSRAs.  Verify transport winds away from SSRAs if burning in any other direction.  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/20100522/d07c576d/attachment.html>