SMI South Central (Smoke Management Instructions) (no subject)

[ODF Smoke Management Instructions]

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS

SALEM FORESTRY WEATHER CENTER

OREGON DEPARTMENT OF FORESTRY



ISSUED: Monday, May 9, 2011       2:40 PM      Jim Little



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



    TUESDAY



An upper level ridge will lie southwest to northeast on an axis from about 900 miles west of Los Angeles to southern British Columbia early in the day on Tuesday.  The ridge will drift eastward during the day providing dry weather and sunshine to the region.  Transport winds will be light and generally northerly.  Afternoon heating should push mixing heights above 5000 feet for generally good smoke dispersal conditions.



    OUTLOOK (WEDNESDAY - FRIDAY)



The upper ridge continues east and the Pacific Northwest starts to come under the influence of an upper level low centered about 250 miles west of the Queen Charlotte Islands on Wednesday morning. A front associated with this low approaches the Oregon coastline during the day, but this side of the Cascades should see just increasing high clouds during the day.  Maximum mixing heights will remain high but transport winds will shift to southwesterly.



The upper level low rotates to about 350 miles west of Vancouver Island by Thursday. The remains of a front will drag through for some light rain early, then expect partly cloudy skies.  Smoke dispersal conditions should remain good.  Transport winds will be generally south westerly.



Friday sees the upper low about 350 miles west of the mouth of the Columbia River.  Wind flow aloft will be southerly.  Little change is expected for this area with high maximum mixing heights and a generally southerly transport wind.



2.  DISPERSION



TUESDAY

Mixing height 3200 - 4200 ft during the morning.  Mixing height rises above 5000 ft during the afternoon then lowers below 1000 ft during the evening.



Transport wind N to NE at 8 - 12 mph during the morning and afternoon.  Transport wind becomes light and variable and controlled by local terrain during the evening.



Surface wind N to NE at 8 - 12 mph during the morning and afternoon.  Surface wind becomes light and variable and controlled by local terrain during the evening.



OUTLOOK:



WEDNESDAY

Mixing height below 1000 ft early rising above 5000 ft by late morning and through the afternoon.  Transport wind SSW to SW at 10 - 16 mph during the morning becoming SW to WSW at 15 - 29 mph during the afternoon.  Surface wind SSW to SW at 8 - 12 mph during the morning becoming SW to WSW at 12 - 22 mph during the afternoon.



THURSDAY

Mixing height below 1000 ft early rising to 4000 - 5000 ft by late morning rising above 5000 ft during the afternoon.  Transport wind S to SW at 4 - 8 mph.  Surface wind S to SW at 4 - 8 mph during the morning becoming light and variable during the afternoon.



FRIDAY

Mixing height below 1000 ft early rising to 3400 - 4400 ft by late morning rising above 5000 ft during the afternoon.  Transport wind S to SW at 4 - 8 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 Tuesday, May 10, 2011.

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



Avoid ignitions within 15 miles to the NNW through ENE of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 30 miles in all directions of SSRAs.  Recommend against burning units that will smolder significantly overnight.  Complete ignitions by 4:00pm.



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

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

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://omls.oregon.gov/pipermail/smi_south_central/attachments/20110509/cbd1d3a4/attachment.html>