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

ODF Smoke Management Instructions smi_northeast at listsmart.osl.state.or.us
Thu Jun 17 14:16:23 PDT 2010


SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS

SALEM FORESTRY WEATHER CENTER

OREGON DEPARTMENT OF FORESTRY



ISSUED: Thursday, June 17, 2010       2:35 PM      Pete Parsons



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



    FRIDAY


A cool upper-level trough will remain over Washington and Oregon.  Another disturbance will rotate into the trough, from off the southern British Columbia coastline, and take up residence just off the northern Oregon coast.  That will maintain a cool and moist southwesterly flow aloft over Oregon.

Some sunshine will allow temperatures to recover close to normal.  However, daytime heating will combine with cool air aloft and the approaching weather disturbance to destabilize the atmosphere.  The chance of showers and thundershowers will increase in the late afternoon and evening.  Mixing heights should be high in the afternoon. The chance of showers or thunderstorms will continue to increase through the night and into Saturday.

    OUTLOOK (SATURDAY-MONDAY)

An upper-level disturbance will move onshore and over western Oregon Saturday with southwesterly flow aloft continuing the chance of showers or thundershowers across northeastern Oregon.  High temperatures should cool back to about 5 degrees below normal.  The disturbance is forecast to move over northeastern Oregon Sunday with showers becoming likely along with a chance of thundershowers.  High temperatures will cool another 5-10 degrees from Saturday with strong onshore flow at the transport level.  The onshore flow will relax and turn more northerly by Monday, as a transitory upper-level ridge moves over Oregon.  That will promote more clearing with temperatures recovering closer to normal.  High afternoon mixing heights are expected during the outlook period.


2.  DISPERSION



FRIDAY



Zone 630 and 632:

Mixing height below 1500 ft early rising to 4000 - 5000 ft by late morning.  Afternoon mixing height rises above 5000 ft then lowers to 1500 - 2500 ft during the evening.



Transport wind ESE to SSE at 6 - 10 mph during the morning.  Transport wind becomes light and variable and controlled by local terrain during the afternoon then increases to NNW to NNE at 15 - 25 mph during the evening.



Surface wind light and variable and controlled by local terrain.  Surface wind increases to NNW to NNE at 10 - 18 mph during the evening.



Zone 633 - 638:

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 E to SE at 6 - 10 mph during the morning.  Transport wind becomes light and variable and controlled by local terrain during the afternoon then increases to E to SE at 5 - 9 mph during the evening.



Surface wind light and variable and controlled by local terrain.  Surface wind increases to ENE to ESE at 4 - 8 mph during the evening.



OUTLOOK:



SATURDAY

Mixing height 2200 to 3200 ft during the morning rising above 5000 ft during the afternoon.  Transport wind WNW to N at 5 - 7 mph during the morning becoming WNW to NNW at 10 - 16 mph during the afternoon.  Surface wind light and variable during the morning becoming NW to NNW at 8 - 14 mph during the afternoon.



SUNDAY

Mixing height 2000 to 3000 ft during the morning rising to 4000 to 5000 ft during the afternoon.  Transport wind NW to NNW at 8 - 12 mph.  Surface wind NW to N at 4 - 8 mph during the morning becoming WNW to NNW at 9 - 15 mph during the afternoon.



MONDAY

Mixing height 2000 to 3000 ft during the morning rising to 4500 to 5000 ft during the afternoon.  Transport wind light and variable during the morning becoming WNW to NNW at 4 - 8 mph during the afternoon.  Surface wind light and variable.



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, June 18, 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 to the ENE through SSE 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

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