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, May 12, 2010       2:40 PM      Pete Parsons



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


THURSDAY
A flat upper-level ridge will result in a weak westerly flow aloft with temperatures several degrees above normal.  A very weak upper-level disturbance may force a surface thermal trough into south-central Oregon late in the day. Mixing should be fair to good from the late morning through the afternoon, although transport winds will be light.

    OUTLOOK (FRIDAY-SUNDAY)
Increasing northwesterly flow aloft will shift the surface thermal trough into eastern Oregon by Friday afternoon with increasing clouds.  Mixing will be good from the late morning through the afternoon with transport winds turning onshore.  A transitory upper-level ridge is forecast to move over Oregon Saturday for continued mostly dry and warm weather.  There could be an isolated afternoon shower with continued good daytime mixing and onshore flow.  The flow aloft is forecast to turn southwesterly and increase on Sunday with a better chance of afternoon showers.  Mixing should be good with increasing southwesterly transport winds.


2.  DISPERSION



THURSDAY

Mixing height below 1000 ft early rising above 5000 ft by late morning.  Mixing height lowers to 1000 - 2000 ft during the evening.



Transport wind E to SE at 6 - 10 mph during the morning.  Transport wind shifts to SSE to SSW at 4 - 8 mph during the afternoon then becomes light and variable and controlled by local terrain during the evening.



Surface wind E to SE at 6 - 10 mph during the morning.  Surface wind becomes light and variable and controlled by local terrain during the afternoon and evening.



OUTLOOK:



FRIDAY

Mixing height below 1000 ft early rising above 5000 ft by late morning and through the afternoon.  Transport wind SSE to SSW at 8 - 14 mph during the morning becoming WSW to WNW at 8 - 12 mph during the afternoon.  Surface wind SSE to SSW at 5 - 9 mph during the morning becoming WSW to WNW at 6 - 10 mph during the afternoon.



SATURDAY

Mixing height below 1000 ft early rising above 5000 ft by late morning and through the afternoon.  Transport wind SSW to WSW at 6 - 12 mph during the morning becoming WSW to WNW at 9 - 15 mph during the afternoon.  Surface wind light and variable during the morning becoming WSW to WNW at 8 - 12 mph during the afternoon.



SUNDAY

Mixing height below 1000 ft early rising above 5000 ft by late morning and through the afternoon.  Transport wind SSE to SSW at 9 - 15 mph during the morning becoming light and variable during the afternoon.  Surface wind SSE to SSW at 6 - 10 mph during the morning becoming light and variable during the afternoon.



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, May 13, 2010.

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



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



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

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/20100512/ad11e89f/attachment.html>