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, November 18, 2009       2:40 PM      Nick Yonker

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

Minor upper level ridge has built over the region this afternoon following the cold front that passed through yesterday.  This ridge will slip to the east tonight as a warm front approaches from the west.  The warm front will spread some clouds over the area overnight and tomorrow but moisture will stay to the northwest.  This pattern is very similar to the one experienced Monday and Tuesday.  The front will stall and leave the region under breezy conditions tomorrow.  After a stable early morning, the combination of warming temperatures and increasing wind will improve smoke dispersion during the afternoon.

    OUTLOOK (FRIDAY - SUNDAY):

Warm front moves by to the north by Friday with the cold front and trough approaching Friday afternoon.  Moisture will be on the increase while the winds start to slacken.  Cold front moves through Friday evening with cold air following and lowering the snow level to the valley floors Friday night.  Upper level trough moves through early Saturday morning.  Another front and trough move in later Saturday with the trough passing through Sunday morning with a ridge following closely behind.  Expect good mixing and smoke dispersion through the period.

2.  DISPERSION

THURSDAY
Mixing height below 1000 ft early rising to 2700 - 3700 ft by late morning.  Afternoon and evening mixing height similar to late morning.

Transport wind S to SW at 14 - 28 mph during the morning.  Transport wind increases to S to SSW at 21 - 37 mph during the afternoon and evening.

Surface wind S to SW at 8 - 12 mph during the morning.  Surface wind increases to S to SSW at 10 - 22 mph during the afternoon and evening.

OUTLOOK:

FRIDAY
Mixing height above 5000 ft throughout the day.  Transport wind S to SSW at 30 - 50 mph during the morning becoming SW to WSW at 20 - 35 mph during the afternoon.  Surface wind S to SSW at 15 - 30 mph during the morning becoming SW to WSW at 15 - 25 mph during the afternoon.

SATURDAY
Mixing height above 5000 ft throughout the day.  Transport wind SW to WSW at 15 - 30 mph during the morning becoming S to SSW at 18 - 32 mph during the afternoon.  Surface wind S to SW at 9 - 15 mph.

SUNDAY
Mixing height above 5000 ft throughout the day.  Transport wind W to WNW at 15 - 25 mph during the morning becoming W to NW at 10 - 20 mph during the afternoon.  Surface wind WSW to WNW at 10 - 16 mph during the morning becoming SW to WSW at 8 - 12 mph 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, November 19, 2009.
==================================================================

Avoid ignitions within 12 miles to the S through SW of SSRAs.  Care needed in selecting units as smoke will likely fumigate along the ground in wind prone areas.  No additional restrictions necessary.

==============================================================
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/20091118/1b860e88/attachment.html>