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: Tuesday, April 13, 2010       2:40 PM      Jim Little

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

An upper level low sets up about 200 miles west of Waldport, Oregon giving south to southwest flow aloft.  An upper short wave in this flow sill bring showers mainly to the area with those showers moving northward during the evening hours.

OUTLOOK (THURSDAY - SATURDAY)

On Thursday the upper low backs off and moves west, farther off the coast.  The upper short wave will rotate out of the state into Washington early in the morning leaving the region dry with a southerly flow aloft.  Expect good mixing heights and good burning conditions most areas.  On Friday the upper low continues off the coast with another weak short wave moving northward across the region producing scattered showers.  On Saturday a front develops offshore and moves to the northern coast late in the afternoon.  Elsewhere expect dry weather with strong southerly transport winds and mixing heights high enough for good smoke dispersal conditions.

2.  DISPERSION

WEDNESDAY
Mixing height above 5000 ft during the morning and afternoon.  Mixing height lowers below 1000 ft during the evening.

Transport wind ESE to SSE at 9 - 15 mph during the morning.  Transport wind shifts to SSW to SW and increases to 15 - 25 mph during the afternoon then decreases to SW to W at 9 - 15 mph during the evening.

Surface wind ESE to SSE at 8 - 12 mph during the morning.  Surface wind shifts to SSW to SW at 10 - 16 mph during the afternoon then becomes light and variable and controlled by local terrain during the evening.

OUTLOOK:

THURSDAY
Mixing height below 1000 ft early rising to 4200 - 5000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind SSE to SSW at 10 - 16 mph.  Surface wind SSE to SSW at 6 - 10 mph.

FRIDAY
Mixing height below 1000 ft early rising to 4400 - 5000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind light and variable.  Surface wind light and variable.

SATURDAY
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.  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 Wednesday, April 14, 2010.
==================================================================

Avoid ignitions within 12 miles to the ESE through W of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 20 miles to the ESE through W in or near drainages leading to SSRAs.  Watch for shifting transport winds.

==============================================================
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/20100413/ca92001b/attachment.html>