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: Thursday, May 13, 2010       4:30 PM      Pete Parsons



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

FRIDAY

A weak upper-level disturbance will slightly flatten the ridge over Oregon with increasing northwesterly flow aloft.  Skies should remain mostly sunny with only isolated afternoon mountain thunderstorm development.  The surface thermal trough will begin the day west of the Cascades and shift into central Oregon in the afternoon.  Mixing will be good from the late morning through the afternoon with southerly transport winds turning onshore in the afternoon.

    OUTLOOK (SATURDAY-MONDAY)

A transitory upper-level ridge is forecast to move over Oregon Saturday for continued mostly dry and warm weather.  Once again, there could be isolated afternoon mountain thundershowers.  After morning inversions, daytime mixing should be good.  Transport winds will likely revert back to southerly in the morning but turn southwesterly in the afternoon.  The flow aloft is forecast to turn southwesterly, and increase, Sunday and Monday with an increasing chance of showers and thunderstorms along with cooler temperatures.  Mixing should be good with increasing southwesterly transport winds.


2.  DISPERSION



FRIDAY

Mixing height below 1000 ft early rising above 5000 ft by late morning.  Mixing height lowers to 1500 - 2500 ft during the evening.



Transport wind SE to S at 7 - 11 mph during the morning.  Transport wind shifts to WSW to WNW at 6 - 10 mph during the afternoon and evening.



Surface wind ESE to SSE at 6 - 10 mph during the morning.  Surface wind becomes WSW to WNW at 6 - 10 mph during the afternoon and evening.



OUTLOOK:



SATURDAY

Mixing height below 1000 ft early rising above 5000 ft by late morning and through the afternoon.  Transport wind SSE to SSW at 6 - 12 mph during the morning becoming SW to W 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.



SUNDAY

Mixing height below 1000 ft early rising above 5000 ft by late morning and through the afternoon.  Transport wind SSE to SW at 10 - 14 mph during the morning becoming SSW to WSW at 13 - 17 mph during the afternoon.  Surface wind SSE to SW 8 - 12 mph in the morning becoming SSW to WSW at 10 - 15 mph during the afternoon.



MONDAY

Mixing height below 1000 ft early rising above 5000 ft by late morning and through the afternoon.  Transport wind SSE to SSW at 14 - 18 mph during the morning becoming SSW to WSW 11 - 15 mph during the afternoon.  Surface wind SSE to SSW at 8 - 12 mph during the morning becoming SW to WNW 8-13 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 Friday, May 14, 2010.

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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 in or near drainages leading to SSRAs.



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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

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