SMI Northeast (Smoke Management Instructions) (no subject)

[ODF Smoke Management Instructions]

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS

SALEM FORESTRY WEATHER CENTER

OREGON DEPARTMENT OF FORESTRY



ISSUED: Tuesday, May 3, 2011       2:35 PM      Jim Little



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



    WEDNESDAY



An upper level ridge drifts eastward across the region on Wednesday.  The axis of the ridge is near the coast early in the morning but by evening lies along a line from eastern Washington to eastern Oregon.  Expect dry weather and high afternoon mixing heights for good smoke dispersal conditions most areas.  Afternoon mixing heights should climb to or above 5000 feet and transport winds will be mostly southerly.



    OUTLOOK (THURSDAY - SATURDAY)



The upper ridge shifts to the northern plains on Thursday as a weak upper trough moves across the Pacific Northwest.  Moisture is limited, thus expect just mid and high clouds.  Temperatures will climb to 6 to 8 degrees above average.  Transport winds start out southerly but become northwesterly during the day.  High maximum mixing heights should provide good smoke dispersal conditions.



A generally zonal or west to east flow aloft prevails on Friday.  Low level transport winds will be generally west-southwesterly.  Smoke dispersal conditions will be fair as maximum mixing heights will be a bit lower than on Thursday.



Little change in the broad upper scale flow for Saturday is likely, but a weak impulse in the flow could bring an increase in mid and high clouds to the region.  Temperatures dip to around 4 to 8 degrees below average for the time of year.  However maximum mixing heights are again likely to exceed 5000 feet and with a good west-southwest transport wind smoke dispersal conditions should be good.



2.  DISPERSION



WEDNESDAY



Zone 630 and 632:

Mixing height 2400 - 3400 ft during the morning.  Mixing height rises to above 5000 ft during the afternoon then lowers to 1700 - 2700 ft during the evening.



Transport wind SE to SSW at 6 - 12 mph during the morning and afternoon.  Transport wind increases to SSE to SSW at 10 - 18 mph during the evening.



Surface wind SE to S at 6 - 10 mph throughout the day.

Zone 633 - 638:

Mixing height 2300 - 3300 ft during the morning.  Mixing height rises to above 5000 ft during the afternoon then lowers to 2800 - 3800 ft during the evening.



Transport wind SE to SSW at 4 - 8 mph during the morning and afternoon.  Transport wind increases to SE to S at 10 - 16 mph during the evening.



Surface wind SE to S at 5 - 9 mph.



OUTLOOK:



THURSDAY

Mixing height 3400 to 4400 ft during the morning rising above 5000 ft during the afternoon.  Transport wind SSW to WSW at 10 - 20 mph during the morning becoming WNW to NNW at 10 - 20 mph during the afternoon.  Surface wind S to SW at 6 - 12 mph during the morning becoming WNW to NNW at 10 - 16 mph during the afternoon.



FRIDAY

Mixing height below 1000 ft early rising to 3500 to 4500 ft by late morning rising to 4200 to 5000 ft during the afternoon.  Transport wind SW to WNW at 4 - 8 mph.  Surface wind light and variable during the morning becoming WSW to WNW at 4 - 8 mph during the afternoon.



SATURDAY

Mixing height below 1000 ft early rising to 4000 to 5000 ft by late morning and through the afternoon.  Transport wind SW to WNW at 4 - 8 mph.  Surface wind light and variable during the morning becoming WSW to WNW at 4 - 8 mph during 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 Wednesday, May 4, 2011.

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



Zone 630 and 632:

Avoid ignitions within 12 miles to the SE through SSW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 20 miles to the SE through SW in or near drainages leading to SSRAs.



Zone 633 - 638:

Avoid ignitions within 12 miles to the ESE through SSW of SSRAs.  Verify transport winds away from SSRAs if burning in any other direction.  No additional restrictions necessary.



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

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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