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: Friday, May 13, 2011       2:40 PM      Pete Parsons



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


SATURDAY

An offshore upper-level low-pressure system is forecast to slowly move closer to the southern Oregon coast.  Increasing southeasterly flow aloft will direct more moisture into the region.  A surface thermal trough will be over the region in the morning, before shifting into eastern Oregon by late-afternoon.  Daytime heating will destabilize the air mass, with some showers and possible thundershowers by evening.  Afternoon temperatures should cool back to about 5 degrees below normal with southerly transport winds veering to southwesterly in the afternoon and evening.  Daytime mixing should remain good.

OUTLOOK (SUNDAY-TUESDAY)

The upper-level trough is forecast to come onshore Sunday and make camp over the Pacific Northwest, slowly weakening Monday and Tuesday.  That will park a very cool and moist air mass over Oregon.  Expect numerous showers, on Sunday, with a chance of thunderstorms.  Rain and snow showers will continue through Tuesday but will be on the decrease.  The snow level should drop to near the valley floors with maximum temperatures plunging to around 20 degrees below normal Sunday, moderating to 10-15 degrees below normal by Tuesday.  Cooling aloft will maintain good daytime mixing with mostly west to southwest transport winds.


2.  DISPERSION



SATURDAY

Mixing height below 1000 ft early rising to 3000 - 4000 ft by late morning.  Afternoon mixing height rises above 5000 ft then lowers to 3000 - 4000 ft during the evening.



Transport wind SSE to SSW at 12 - 22 mph.



Surface wind SSE to SSW at 6 - 10 mph.



OUTLOOK:



SUNDAY

Mixing height below 1000 ft early rising to 2200 - 3200 ft by late morning rising above 5000 ft during the afternoon.  Transport wind S to SW at 10 - 18 mph.  Surface wind S to SW at 8 - 12 mph.



MONDAY

Mixing height 2200 - 3200 ft during the morning rising above 5000 ft during the afternoon.  Transport wind SSW to WSW at 4 - 8 mph during the morning becoming WSW to WNW at 5 - 9 mph during the afternoon.  Surface wind light and variable during the morning becoming WSW to NW at 4 - 8 mph during the afternoon.



TUESDAY

Mixing height below 1000 ft early rising to 3500 - 4500 ft by late morning rising above 5000 ft during the afternoon.  Transport wind S to SW at 6 - 10 mph.  Surface wind S to SW at 4 - 8 mph.



3.  BURNING INSTRUCTIONS FOR ZONES 624 AND 625 INCLUDING THE WALKER

    RANGE PORTION OF ZONE 624

This instruction is valid for burning conducted on Saturday, May 14, 2011.

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Avoid ignitions within 12 miles to the SSE through WSW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 20 miles to the SSE through WSW 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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