SMI Northeast (Smoke Management Instructions) Northeast Oregon Smoke Management Instructions

[ODF Smoke Management Instructions]

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS

SALEM FORESTRY WEATHER CENTER

OREGON DEPARTMENT OF FORESTRY



ISSUED: Thursday, May 13, 2010       4:05 PM      Pete Parsons



1.  DISCUSSION AND FORECAST FOR NORTHEAST FORECAST AREA ZONES 630-638


    FRIDAY

A weak upper-level disturbance will slightly flatten the ridge over Oregon with increasing northwesterly flow aloft.  The surface thermal trough will begin the day west of the Cascades and shift into central Oregon in the afternoon.  Transport winds will generally be southerly and decrease in the afternoon.  After morning inversions, mixing should be good from the late morning through the afternoon.  The air mass may destabilize enough for a few afternoon and early evening mountain thunderstorms to develop.

    OUTLOOK (SATURDAY-MONDAY)

A transitory upper-level ridge is forecast to move over Oregon Saturday. Temperatures will continue to warm, as the surface thermal trough moves over eastern Oregon.  Conditions should remain mostly dry except for a slight chance of afternoon mountain thunderstorms.  Early morning inversions will give way to good afternoon mixing, but transport winds will become light and variable. The flow aloft is forecast to turn southwesterly, and increase, Sunday and Monday with an increasing chance of showers and thunderstorms.  Mixing should be good with increasing southerly transport winds Sunday, turning westerly Monday with significantly cooler surface temperatures.


2.  DISPERSION



FRIDAY



Zone 630 and 632:

Mixing height below 500 ft early rising above 5000 ft by late morning.  Mixing height lowers to 1500 - 2500 ft during the evening.



Transport wind S to SE at 8 - 14 mph during the morning.  Transport wind becomes light and variable in the afternoon and controlled by local terrain during the evening.



Surface wind light and variable and controlled by local terrain.



Zone 633 - 638:

Mixing height below 500 ft early rising above 5000 ft by late morning.  Mixing height lowers to 1000 - 2000 ft during the evening.



Transport wind SE 5-10 mph during the morning...becoming light and variable in the afternoon and controlled by local terrain.



Surface wind light and variable and controlled by local terrain.



OUTLOOK:



SATURDAY

Mixing height below 1000 ft early rising above 5000 ft by late morning and through the afternoon.  Transport wind SE to S at 5 - 15 mph during the morning becoming SE to SSW at 4 - 8 mph during the afternoon.  Surface wind SE to S at 4 - 12 mph.



SUNDAY

Mixing height below 1000 ft early rising above 5000 ft by late morning and through the afternoon.  Transport wind S to SE 8-18 mph.  Surface wind ESE to S 5-15 mph.



MONDAY

Mixing height below 1000 ft early rising above 5000 ft by late morning and through the afternoon.  Transport wind SE to SW 10 - 20 mph in the morning becoming SSW to WSW at 10 - 20 mph during the afternoon.  Surface wind SE to SW 8 - 18 mph in the morning becoming SW to W 10 - 20 mph in the afternoon.



3.  BURNING INSTRUCTIONS FOR NORTHEAST OREGON ZONES 630-638

    The following considerations should be adhered to in addition to

    the requirements of the Oregon Smoke Management Plan. These

    Instructions are valid for burning conducted on Friday, May 14, 2010.

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



Zone 630 and 632:

Avoid ignitions within 12 miles in all directions of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 20 miles in all directions of SSRAs.



Zone 633 - 638:

Avoid ignitions within 12 miles in all directions of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 20 miles in all directions of SSRAs.



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

4.  SPECIAL NOTE:



    The smoke management forecaster is available at (503)-

    945-7401. Please call this number and not individual's

    numbers to discuss daily burning.  For large burns (over

    2000 tons) or burns extending over a considerable period,

    please request a special forecast.  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_northeast/attachments/20100513/5a3b3167/attachment.html>